ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (10,791)
  • Inorganic Chemistry  (7,227)
  • Industrial Chemistry  (3,169)
  • Ultrastructure  (395)
  • GEOPHYSICS
  • 1970-1974  (6,125)
  • 1950-1954  (2,931)
  • 1915-1919
Collection
Source
Keywords
Publisher
Years
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    A fine structural study on the extracellular activity of alkaline phosphatase and its role in calcification (1974)
    Springer
    Calcified tissue international 15 (1974), S. 201-212 
    Details
    ISSN: 1432-0827
    Keywords: Ultrastructure ; Alkaline Phosphatase ; Calcification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Des cals expérimentaux de neuf jours, formés au niveau de radius de jeunes rats, sont traités par la méthode calcium-cobalt de Gomori (1939) pour la mise en évidence ultrastructurale de la phosphatase alcaline afin d'étudier son rôle éventuel dans le dépôt du calcium. L'activité enzymatique apparait initialement sous forme de précipités globulaires en dehors de la membrane cellulaire de jeunes chondroblastes hypertrophiques. Ce précipité donne ensuite naissance à des corps sphériques de phosphatase alcaline qui se forme près de la cellule. Ces corps sphériques s'observent dans une zone intermédiaire plus éloignée. Une formation de cristaux en aiguilles (apparemment une calcification) se développe dans des corps isolés ou agrégés, laissant voir nettement leurs limites, même lorsque la calcification est plus avancée au point qu'on ne peut plus distinguer des cristaux individuels. Au niveau des coupes témoins, traitées de façon identique mais sans substrat ou avec de l'E.D.T.A., on n'observe ni précipité enzymatique ou corps sphériques. L'aspect des dépôts cristallins dans des corps qui contiennent de la phosphatase alcaline ne peut s'expliquer que par l'existence d'une association étroite entre enzymes et calcification.
    Abstract: Zusammenfassung Neun Tage alter experimenteller Kallus an Radii von jungen Ratten wurde mit Gomori's (1939) Calcium-Kobalt Methode untersucht, um die Verteilung der alkalischen Phosphatase und ihre Beziehung zur Calciumablagerung ultrastrukturell zu demonstrieren. Enzymaktivität zeigte sich zuerst als globulares Präzipitat außerhalb der Zellmembran von Knorpelzellen im Beginn der Hypertrophie. Aus dieser Präzipitatschicht entstanden dann gerundete Körperchen, die sich von der Zelle abtrennten. Solche Körperchen wurden auch in größerer Entfernung von der Zelle beobachtet, d.h. in einer Zwischenzone zwischen benachbarten Zellen. Nadelförmige Kristalle, wahrscheinlich von Calcium-Salzen, wurden in einzelnen oder aggregierten Körperchen beobachtet. Die äußere Zone der Körperchen blieb jedoch deutlich sichtbar, selbst dann, wenn der Calciumgehalt derart zugenommen hatte, daß einzelne Kristalle nicht länger erkennbar waren. In Kontrollen, die in gleicher Weise behandelt waren, aber ohne Substrat oder mit Zufügung von EDTA, wurden weder Präzipitate noch Körperchen beobachtet. Das Auftreten von Calciumablagerungen in alkalischer Phosphatase enthaltenden Körperchen scheint kaum anders erklärbar als durch eine enge funktionelle Verbindung zwischen Enzym und Calciumablagerung.
    Notes: Abstract Nine day old experimental calluses in radii of young rats were treated with Gomori's (1939) calcium-cobalt method to demonstrate ultrastructurally the presence of alkaline phosphatase in a search for its possible role in the desposition of calcium. Enzyme activity first appeared as globule-like precipitates outside the cell membrane of early hypertrophic cartilage cells. This precipitate layer then seemed to give rise to spherical bodies of alkaline phosphatase which occur at a slight distance from the cell. The spherical bodies were also observed further away from the cell in an intermediate zone between neighboring cells. Needle-like crystal formation, apparently calcification, occurred inside single or aggregated bodies, leaving their peripheral rim clearly visible, even when calcification had increased to such an extent that individual crystals could no longer be recognised. In controls, treated in the same way but without substrate, or with EDTA, no enzyme precipitate or spherical bodies were seen. The appearance of crystalline deposits in bodies which contain alkaline phosphatase seems difficult to explain on any other basis than that there is a close functional association between the enzyme and calcification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059057
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Wall ultrastructure ofScenedesmus culture N 46 (1974)
    Springer
    Archives of microbiology 96 (1974), S. 145-153 
    Details
    ISSN: 1432-072X
    Keywords: Ultrastructure ; Scenedesmus Bristles ; Openings ; Props ; Ridges ; Tubules ; Brisble Origin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bristles radiating from openings were detected on colonies and unicells ofScenedesmus culture N 46, when examined with transmission and scanning electron microscopes. Although narrower, they correspond in gross appearance and ultrastructure to previously describedScenedesmus bristles. Openings, bordered by a series of props, are unlike those ofScenedesmus culture 614. Additional props are observed scattered independently on the cell wall; ridges are composed of a linear row of props. Sections of cells, or cell walls, reveal an additional prop, situated inside the openings; these props are composed of several tubules. Possible extrusion of bristles through these tubules, as well as the origin of the bristle from the cavity and vesicles immediately under the opening are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00590171
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    An ultrastructural study of septal dissolution inSchizophyllum commune (1974)
    Springer
    Archives of microbiology 96 (1974), S. 175-182 
    Details
    ISSN: 1432-072X
    Keywords: Ultrastructure ; Septa ; Schizophyllum ; Dissolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A strain ofSchizophyllum commune carrying a mutation in theB-mating factor (B-mut) shows septal dissolution when grown at 30° C for 2 to 3 days. The septa are intact if the organism is grown at 25° C for the same time, but begin to break down within 1 h after transfer to 30° C. At the ultrastructural level the dolipore swelling is the first part of the septal apparatus to be degraded, closely followed by the disorganization of the parenthesomes. A progressive thinning of the septal cross-wall produces an enlargement of the septal aperture sufficient to allow the passage of nuclei. It appears that degradative enzymes are probably carried to the site of septal dissolution in vesicles derived from endoplasmic reticulum in the area of the septal apparatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00590174
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Nitrogen metabolism and ultrastructure inAnabaena cylindrica (1974)
    Springer
    Archives of microbiology 96 (1974), S. 271-279 
    Details
    ISSN: 1432-072X
    Keywords: Anabaena cylindrica ; Nitrogen Starvation ; Pigmentation ; Ultrastructure ; Heterocyst Differentiation ; Nitrogenase Activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nitrogen starvation, effected by incubating a culture ofAnabaena cylindrica in a medium free from combined nitrogen and under an atmosphere of 1% CO2 in argon, leads to rapid and characteristic changes in the appearance, structure and function of the alga. Change of colour, due apparently to a decrease in the amounts of nitrogenous pigments, is accompanied by a structural transformation of vegetative cells: cyanophycin granules and polyhedral bodies disintegrate, lipid and glycogen accumulate, and large membrane-bound spaces form by means of thylakoid swelling and vesiculation. The rate of heterocyst differentiation and nitrogenase activity is increased. These changes are fully reversed on addition of ammonia to the culture. It appears that thylakoids reform by coalescence of small vesicles assembled in the intrathylakoidal space. Rapid ammonia assimilation is indicated by ample formation of cyanophycin granules in vegetative cells and of “plugs” in the heterocysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00590183
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Ultrastructural aspects of the marine fungusJaponochytrium sp. (1974)
    Springer
    Archives of microbiology 96 (1974), S. 305-317 
    Details
    ISSN: 1432-072X
    Keywords: Marine Fungi ; Ultrastructure ; Multilamellate Sporangial Wall ; Sagenogenetosome ; Zoospore Cleavage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The morphology and ultrastructure of aJaponochytrium sp. has been studied by light, scanning and transmission electron microscopy. The wall has been shown to be multilamellate and persistent. Stages in zoospore cleavage are described and sagenogenetosomes reported in mature sporangia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00590186
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Cell wall formation in zoospores of Allomyces arbuscula (1974)
    Springer
    Archives of microbiology 98 (1974), S. 147-158 
    Details
    ISSN: 1432-072X
    Keywords: Allomyces ; Zoospores ; Cell Wall ; Wall Formation ; Lomasome ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ultrastructural observations on encysting haploid zoospores of Allomyces arbuscula are presented with special reference to cell wall deposition. Multivesicular bodies are observed in the cytoplasm of zoospores 15 min after inoculation, lomasomes after 30 min and fine membrane profiles between the plasmalemma and the cyst wall are observed after 4 h indicating a possible system for secretion of cell wall components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425277
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The presence of unusual microtubular structures in senescent cells of Chlamydomonas dysosmos (1974)
    Springer
    Archives of microbiology 98 (1974), S. 199-206 
    Details
    ISSN: 1432-072X
    Keywords: Ultrastructure ; Chlamydomonas ; Senescent ; Microtubules ; Complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Complexes of twisted ribbons composed of ordered arrays of microtubules are identified in close association with the plasmalemma and the surfaces of some organelles in senescent cells of photoheterotrophically cultured Chlamydomonas dysosmos. The ribbon complexes occur throughout the cytoplasm, and do not appear related to the flagellar insertions. The component microtubules are approximately 26 nm in width, exhibiting a center-to-center spacing of about 44 nm. Additional cytoplasmic microtubules are often closely related to the tubular complexes. A detailed description of their fine structure is presented here which tends to support the ascribed function of microtubules in maintaining the structural integrity of the protoplasm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425282
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Nitrogen metabolism and ultrastructure inAnabaena cylindrica (1974)
    Springer
    Archives of microbiology 99 (1974), S. 221-230 
    Details
    ISSN: 1432-072X
    Keywords: Anabaena cylindrica ; Molybdenum ; Vanadium ; Nitrogenase ; Ultrastructure ; Storage Products ; Heterocyst Frequency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The structural and functional symptoms of molybdenum deficiency inAnabaena cylindrica grown in a medium without combined nitrogen and thus dependent on fixation of elemental nitrogen, resemble those brought about by nitrogen starvation. However, the substantially increased rate of heterocyst differentiation in this culture is not accompanied by a corresponding increase in nitrogenase activity; on the contrary, enzyme activity is severely impaired in the absence of molybdenum. When the supply of molybdenum, or of ammonia, is restored, the alga recovers rapidly. Vanadium exerts an inhibitory effect upon nitrogen-fixing ability of the alga, and its presence in the molybdenum-deficient culture results in the amplification of the symptoms of mlybdenum deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696236
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Occurrence of microbodies in chloromonadophycean algae (1974)
    Springer
    Archives of microbiology 99 (1974), S. 265-269 
    Details
    ISSN: 1432-072X
    Keywords: Ultrastructure ; Microbodies ; Vacuolaria ; Gonyostomum ; Chloromonadophyceae ; Chromophyta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Microbody-like organelles occur in the cytoplasm of two chloromonadophycean algae,Vacuolaria virescens Cienkowsky andGonyostomum semen Diesing. Microbodies ofVacuolaria andGonyostomum have a granular matrix which lacks a crystalloid core; they are often present in close association with elements of the endoplasmic reticulum. The occurrence of microbodies in other algae is briefly reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696241
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    A cyanobacterium which lacks thylakoids (1974)
    Springer
    Archives of microbiology 100 (1974), S. 419-436 
    Details
    ISSN: 1432-072X
    Keywords: Gloeobacter violaceus ; Photosynthetic Pigments ; DNA Base Composition ; Fatty Acid Composition ; Cyanobacterium ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Gloebacter violaceus gen. and sp. n. is a unicellular photosynthetic prokaryote of unusual cellular structure. The only unit membrane in the small, rod-shaped cells is the cytoplasmic membrane, which has a simple contour, without intrusions. Immediately underlying it is an electron-dense layer 80 nm thick. Gloeobacter is an aerobic photoautotroph which contains chlorophyll α, β-carotene and other carotenoids, allophycocyanin, phycocyanin and phycoerythrin. Chlorophyll and carotenoids are associated with the particulate fraction of cell-free extracts, and are thus probably localized in the cytoplasmic membrane. The phycobiliproteins may be associated with the electron-dense 80 nm layer. The DNA contains 64.4 moles percent GC. The cellular lipids have a high content of polyunsaturated fatty acids, largely linoleate and γ-linolenate. Despite its atypical fine structure, Gloeobacter is evidently a cyanobacterium, sufficiently different from other unicellular cyanobacteria to be placed in a new genus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446333
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 11
    Electronic Resource
    Electronic Resource
    A study of sporophore development in the myxomyceteProtophysarum phloiogenum (1974)
    Springer
    Archives of microbiology 99 (1974), S. 331-344 
    Details
    ISSN: 1432-072X
    Keywords: Myxomycetes ; Ultrastructure ; Development ; Systematics ; Food Vacuoles ; Stalk Development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Observations of sporophore development in fresh and glutaraldehydeosmium sequentially-fixed material ofProtophysarum phloiogenum show the following sequence. Small plasmodia cease streaming and round up. Food vacuoles collect in the lower center of the cytoplasmic mass. As the cytoplasm rises the food vacuolar contents are excluded from the plasmalemma and become the stalk core. A continuous, fibrous peridium and stalk tube enclose cytoplasm and stalk core respectively. Capillitial formation just precedes spore cleavage. Sporophore development is marked by autophagic activity and calcium deposition. Stalks of dried herbarium specimens of seven additional species have been examined. A mature stalk morphology very similar toProtophysarum with recognizable remnants of microorganismal food material is seen in all of them. It is thought that this marker is indicative of non-stemonitaceous stalk development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696247
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    The rotifer trap of Zoophagus (1974)
    Springer
    Archives of microbiology 101 (1974), S. 95-107 
    Details
    ISSN: 1432-072X
    Keywords: Zoophagus insidians Rotifer ; Predacious Fungi ; Oomycetes ; Glue Secretion ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The predacious watermold Zoophagus insidians traps loricate rotifers on short, lateral branches of the main, hyphal axis. These branches or “traps” are packed at their distal ends with a number of vesicles filled with an electron-dense matrix. Electron micrographs of the mycelium disclose a two-layered wall; the outer layer is electron dense and the inner, electron transparent. The outer dense layer on the tip of the “trap” is organized into a number of fine ridges and occasional discontinuities. Thin sections through recently trapped rotifers indicate that the cilia of the animals are stuck to the trap by a glue. This adhesive is derived from secretion of the matrix of the vesicles aggregated in the tip of the trap. The secretion mechanism is triggered by the animal and is accompanied by: 1. The separation of the two layers of the wall, 2. fusion of the vesicles with the cell membrane and 3. extrusion of the glue through pits in the tip of the inner wall of the “trap”. After snaring a rotifer, the previously arrested branch grows as a haustorium into the body cavity of the animal. The host tissues disintegrate within a few hours and appear to be the main nutrient source of the fungus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455929
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Ultrastructural aspects of localized membrane damage in Spirillum serpens VHL early in its association with Bdellovibrio bacteriovorus 109D (1974)
    Springer
    Archives of microbiology 100 (1974), S. 179-195 
    Details
    ISSN: 1432-072X
    Keywords: Bdellovibrio bacteriovorus ; Spirillum serpens ; Freeze Fracture ; Electron Microscopy ; Ultrastructure ; Membrane Damage ; Organismic Associations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The freeze-fracture technique and electron microscopy have been used to demonstrate that localized damage is inflicted upon the cytoplasmic membrane of Spirillum serpens VHL within 20 to 30 min after the start of its association with Bdellovibrio bacteriovorus 109D. This damage is not observed in uninfected Spirillum cells, nor in infected cells within the first 10 min. This damage takes the form of a “blister” which, when viewed stereoscopically in electron micrographs, is seen to project toward the interior of the Spirillum cell. Shortly after its formation, the blister becomes elaborated into a series of ridges which may assume forms ranging from an elaborate spiral to a series of loops or knots. The formation of a blister is shown to involve both the inner and outer leaves of the membrane bilayer, and evidence is presented to indicate that the blister site corresponds to the site of attachment of the Bdellovibrio cell. The hypothesis is proposed that this ultrastructural damage is the cytological basis for the controlled and localized leakage through the cytoplasmic membrane into the periplasmic space of the Spirillum cell at locations adjacent to the Bdellovibrio cell. It is suggested that this localized membrane damage may be the ultrastructural basis for the high efficiency with which bdellowvibrios are known to incorporate cytoplasmic materials from the other bacteria in whose periplasmic spaces they develop.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446316
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Comparative structural characterization of material extractable from aerial sheath of Streptomyces roseoflavus var. roseofungini (1974)
    Springer
    Archives of microbiology 101 (1974), S. 71-82 
    Details
    ISSN: 1432-072X
    Keywords: Streptomycetes ; Ultrastructure ; Surface Sheath
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 1. Tubular-like structures were regularly revealed in the surface sheath of the aerial mycelium of the parent strain of Streptomycetes roseoflavus var. roseofungini. In their shape and dimensions these structures were highly reminiscent of those massive accumulation of which was earlier reported to occur in cultures of dedifferentiated nocardioform “fructose” mutant of the same parent strain. 2. The tubular-like structures of the aerial mycelium sheath were shown to be markedly susceptible to brief acetone washing, undergoing almost complete desintegration. 3. On addition of water to crude acetone extract of the aerial mycelium precipitation and possible selfassembly of a spectrum of various structures occurred (folded scaly, bubble-like, spout-like). Some among structures so produced were reminiscent of those found in spectra of structures observed in reconstruction experiments with tubules from the mutant as well as of structures found in the aerial sheath of the parent strain and some other actinomycetes. Similarity in subunit structure of above materials was also noticeable. The presence, in the sheath of aerial mycelium, of material with a tendency to selforganization is discussed in relation to the possible involvement of selfassembly processes in the formation of the surface sheath.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455926
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    The fine structure of the lutein cells in the blue fox (Alopex lagopus) with special reference to the secretory activity during pregnancy (1974)
    Springer
    Cell & tissue research 149 (1974), S. 61-79 
    Details
    ISSN: 1432-0878
    Keywords: Ovary ; Blue fox ; Lutein cells ; Plasma progesterone ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An electron microscopic investigation of the lutein cells of the blue fox was undertaken, based on the hypothesis that differences in plasma progesterone levels at differing stages of pregnancy might be reflected in the ultrastructural organization. Comparisons were made between corpora lutea taken from animals mated 1, 2, 5, 14, 18, 20, 28, 33, 36, 39 and 45 days after the estimated time of ovulation. Measurements of progesterone on plasma samples were performed by a rapid competitive protein-binding assay. During the period with increasing and/or high plasma progesterone levels, (i.e. 1 to 14 days after ovulation) the lutein cells are characterized by evenly distributed cisternal agranular ER, mitochondria with both tubular and lamellar cristae, and electron-dense lipid droplets. The abundant agranular ER is closely associated with the lipid droplets and mitochondria. During the period with declining plasma progesterone levels, the lutein cells present a different morphological picture: the agranular ER assumes the form of bundles of parallel tubules disposed in several planes. During the latest stages observed, these “bundles” are disrupted and most of the agranular ER become arranged in smaller concentric whorls. Both kinds of whorls regularly enclose lipid droplets, dense bodies and mitochondria. The regions between the whorls contain scattered cisternae of endoplasmic reticulum, ribosomes, mitochondria and lysosome-like dense bodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209050
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Ultrastructure of neurohemal organs (paraganglionic plates) of Trogulus nepaeformis (scopoli) (opiliones, trogulidae) and release of neurosecretory material (1974)
    Springer
    Cell & tissue research 150 (1974), S. 67-78 
    Details
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Harvestman ; Exocytosis ; Release ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les plaques paraganglionnaires de l'Opilion Trogulus nepaeformis sont des organes neurohémaux constitués d'une lamelle neurale externe, épaisse, en contact avec un sinus sanguin, d'une couche basale de cellules gliales, et de 7 types de terminaisons axonales (A1, A2, B1, B2, B3, B4 and C) renfermant des granules élémentaires qui diffèrent par leur taille, leur densité aux électrons et l'aspect de leur contenu. Les granules de type A1 se déchargent par exocytose dans l'espace extra-axonal, sous la lamelle neurale; ceux de type C se fragmentent en microgranules à contenu dense qui s'accumulent avec des vésicules claires contre l'axolemme en des places suggérant des sites de libération dans l'hémolymphe.
    Notes: Summary The paraganglionic plates of the harvestman, Trogulus, are neurohemal organs composed of a thick neural lamella facing a blood sinus, basal glial cells, and seven distinct types of axon terminals (A1, A2, B1, B2, B3, B4 and C) identified on the basis of elementary granule size, electron density, and structure of contents. The release of A1 type granules occurs by exocytosis into the extraaxonal space below the acellular neural lamella. The release of the content of C granules occurs after fragmentation into small electron dense vesicles. Clusters of these vesicles intermixed with clear vesicles pressing against the axolemma beneath the neural lamella, apparantly correspond to the sites of release.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220381
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Ultrastructural and cytochemical localization of the storage sites of monoamines in the paraventricular organ of Xenopus laevis tadpoles (1974)
    Springer
    Cell & tissue research 151 (1974), S. 417-421 
    Details
    ISSN: 1432-0878
    Keywords: Paraventricular organ ; Xenopus laevis ; Monoamines ; Cytochemistry ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultracytochemical identification of monoamines in the paraventricular organ (PVO) of Xenopus laevis tadpoles was achieved by applying glutaraldehyde-potassium dichromate fixation to the brains. It appears that the amines are concentrated inside elongated or round large granular vesicles within the neurons. The presence of dopamine and, to a lesser extent, of indolamines in neurons of the PVO is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222988
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Ultrastructural studies on the development of the nerve supply in the rabbit pars intermedia (1974)
    Springer
    Cell & tissue research 152 (1974), S. 113-128 
    Details
    ISSN: 1432-0878
    Keywords: Rabbit pars intermedia ; Ultrastructure ; Nerve terminal ; PI-type glandular cell ; ACT-type cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary By electron microscopy three types of nerve terminals have been identified in adult rabbit pars intermedia (PI). The characteristics of these are described and their development traced. The distribution of nerve terminals and neurons within the PI is documented. In particular the association between types of nerve terminal and the different glandular cells is shown to be precise and selective. Direct innervation of the ACT-type cells in the rabbit PI is described for the first time. The author is particularly grateful to Dr. J. W. B. Bradfield for help in the preparation of this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224214
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    A note on the ultrastructure of the Octopus olfactory organ (1974)
    Springer
    Cell & tissue research 152 (1974), S. 253-258 
    Details
    ISSN: 1432-0878
    Keywords: Olfactory organs ; Cephalopods ; Chemoreception ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of the so-called olfactory organ of Octopus vulgaris has been investigated. Electron microscopy shows the superficial layer of the epithelium to consist mainly of cells bearing microvilli. Below this, often very deeply, lie very many large cells, which bear numerous cilia. These cells open to the surface via narrow processes running between the epithelial cells. Although details of their innervation have yet to be established the large cells are assumed to be receptors and these findings are interpreted as evidence that this organ is indeed chemosensory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224699
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    An ultrastructural study of the subcommissural organ cells of the African clawed toad, Xenopus laevis (1974)
    Springer
    Cell & tissue research 152 (1974), S. 239-252 
    Details
    ISSN: 1432-0878
    Keywords: Ultrastructure ; Xenopus laevis ; Histochemistry ; Subcommissural organ (SCO)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural features of the subcommissural organ (SCO) cells in larvae (stages 56–58, according to Nieuwkoop and Faber, 1956), toadlets (3 months after metamorphosis) and older toads (2-year old) of Xenopus laevis are described. Several age-related morphological differences in the endoplasmic reticulum (ER) of the SCO cells have been found. In old toads the rough ER assumes a special “ladder-like” membrane configuration in its cisternal lumen. By means of the periodic acid-chromic acid-silver methenamine (PA-CrA-SM) method, complex carbohydrates are detected electron microscopically in the SCO cells. Positive reactions take place in the cell adhesive apparatus, the secretory granules, part of the Golgi complex, and the intracisternal “ladder-like” structure. Passing through the Golgi complex, the secretory products mature into the secretory granules by association of their proteinaceous component with polysaccharides. The majority of the secretory granules are released from the apical cell surface by means of reverse pinocytosis, while the rest are released through the basal process into the blood circulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224698
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 21
    Electronic Resource
    Electronic Resource
    Special muscle cells and their innervation in the mammalian small intestine (1974)
    Springer
    Cell & tissue research 153 (1974), S. 63-77 
    Details
    ISSN: 1432-0878
    Keywords: Smooth muscle ; Intestine ; Afferent fibres ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The innermost layer of the circular musculature of the ileum of the guinea-pig, mouse, rat, rabbit, cat and dog is made of special small and dark muscle cells (sd cells), which can be identified by light and electron microscopy. These cells have a higher surface to volume ratio than ordinary muscle cells. They show all the organelles of smooth muscle cells and are in close relationship with a great number of extrinsic and intrinsic nerve fibres. They send numerous thin cytoplasmic processes towards the bulk of the circular layer, but nexuses between the sd cells and ordinary muscle cells are not found. It is suggested that some of the nerve fibres in this part of the circular layer are motor, setting the sd cells to a given length, and some are afferent in luminal pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225446
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 22
    Electronic Resource
    Electronic Resource
    Catalase-like crystals in parathyroid gland cells of Rana temporaria L. (1974)
    Springer
    Cell & tissue research 153 (1974), S. 167-173 
    Details
    ISSN: 1432-0878
    Keywords: Parathyroids ; Rana temporaria ; Crystals ; Ultrastructure ; Catalase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Crystalline inclusions in parathyroid gland cell nuclei of Rana temporaria were studied by electron microscopy using a specimen tilting stage. Images were analysed by optical diffraction. Results were compared with X-ray and electron microscopic data of trigonal bovine liver catalase to which a striking resemblance of the inclusions was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226605
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 23
    Electronic Resource
    Electronic Resource
    Connections between adjacent retinula cell columns in the eye of Ephestia kuehniella Zeller (Lepidoptera, Pyralididae) (1974)
    Springer
    Cell & tissue research 153 (1974), S. 189-193 
    Details
    ISSN: 1432-0878
    Keywords: Eyes ; Retinula ; Ephestia kuehniella ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Im Auge von Ephestia kommen Kontakte zwischen den Zellen benachbarter Retinulae vor. Diese Kontakte finden sich am häufigsten in der Kernregion der Retinulazellen und können 2 oder mehr Retinulae miteinander verbinden. Da keine besonderen Membranstrukturen in der Kontaktzone beobachtet wurden und da andererseits die Retinulazellen auf diesem Niveau und weiter distal Pigmentgranula enthalten, scheinen diese Kontakte weder die Zellen chemisch bzw. elektrisch zu koppeln noch Reizlicht zu übertragen. Vielmehr wird angenommen, daß die Verlagerungen des Cytoplasmas bei Hell-Dunkeladaptation in benachbarten Retinulae durch die gegenseitige Berührung koordiniert werden.
    Notes: Summary Connections were found between retinula cells of adjacent retinula cell columns in the eye of Ephestia. The connections occur most frequently at the level of the retinula cell nuclei and may involve two or more retinula columns simultaneously. The absence of specialized structural modifications of the membranes and the presence of pigment granules at the level of the connections or distal to them indicates that these connections are probably not involved in selective chemical or electrical communication nor in light transmission. It is suggested that the connections may serve tactily to coordinate cytoplasmic movement in adjacent retinula columns during light-dark adaptation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226607
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 24
    Electronic Resource
    Electronic Resource
    On the morphology of the human sertoli cell (1974)
    Springer
    Cell & tissue research 153 (1974), S. 339-355 
    Details
    ISSN: 1432-0878
    Keywords: Sertoli cell, human ; Morphological classification ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary As revealed by light microscopical investigations the human Sertoli cell presents different appearances according to the pattern of infranuclear cytoplasmic inclusions. Although two or three stages of spermatogenesis are seen in a single cross section of a seminiferous tubule the Sertoli cells all show virtually the same features in such a cross sectioned tubule. The different appearances are also evident under the electron microscope. Although no obvious correlation was found with the stages of spermatogenesis in the seminiferous epithelium, the Sertoli cell appearances described here may be assumed to represent different metabolic situations. Other features of Sertoli cell ultrastructure are discussed such as the presence of residual bodies in the apical cytoplasm, glycogen-rich areas protruding towards the tubular lumen or the extracellular space, and membrane bound, round structures, found between the membranes of the smooth endoplasmic reticulum and resembling the “microbodies” of steroid producing cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229163
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 25
    Electronic Resource
    Electronic Resource
    The ultrastructure of the medial preoptic area of the rat (1974)
    Springer
    Cell & tissue research 153 (1974), S. 517-530 
    Details
    ISSN: 1432-0878
    Keywords: Medial preoptic area ; Hypothalamus ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The neuronal and glial cell bodies and the neuropil of the medial preoptic area of the rat hypothalamus were studied under the electron microscope. Two different types of neurons are identified on the basis of electron density. These two types differed in a number of ultrastructural features. Three types of nerve terminals based on vesicle morphology are also described, as well as the general structure of the axons, dendrites and synapses in the neuropil. The structure of oligodendrocytes and astrocytes is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231544
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 26
    Electronic Resource
    Electronic Resource
    Influence of castration on incorporation of exogenous peroxidase into “synaptic” vesicles of the median eminence (1974)
    Springer
    Cell & tissue research 155 (1974), S. 1-11 
    Details
    ISSN: 1432-0878
    Keywords: Median eminence ; Agranular and granular vesicles ; Horseradish peroxidase ; Micro-pinocytosis ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Nerve profiles in the basal part of the palisade zone of rat median eminence have been divided into 4 categories on the basis of their vesicular content: profiles a with agranular vesicles of about 50 nm, b with similar agranular vesicles and also with granular vesicles of mainly 70–140 nm, c with granular vesicles alone and d without vesicles. After intravenous injection of exogenous peroxidase, castrated male rats showed, in comparison to sham-operated controls, a 3–5 fold increase in the percentage of nerve profiles of category a which contained peroxidase loaded vesicles of about 50 nm. In contrast, no significant change was observed for nerve profiles of other categories. It is concluded that exogenous peroxidase may be used to demonstrate changes in the activity of tuberoinfundibular nerve terminals at the ultrastructural level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220280
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 27
    Electronic Resource
    Electronic Resource
    Ultrastructural changes in the tail muscles of anuran tadpoles during metamorphosis (1974)
    Springer
    Cell & tissue research 155 (1974), S. 321-336 
    Details
    ISSN: 1432-0878
    Keywords: Muscle fibres (Tadpole tail) ; Degeneration ; Macrophages ; Autophagic vacuoles ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary This report describes histochemical and ultrastructural studies of tail muscles in tadpoles of Rana japonica and Rana catesbeiana during metamorphosis, this process being accompanied by degeneration of the tail. Degeneration of individual tail muscles does not occur at the same time; this is true for both the red and white muscle fibres. The initial phase of degeneration showed mesenchymal macrophages first invading the muscle fibres and then sending out many long cytoplasmic processes which split the fibres apart. The disappearance of myofibrils during degeneration proceeds along at least two different mechanisms even within a single muscle fibre. In one type, the Z-band becomes diffuse and then disappears, resulting in fragmentation of the myofibrils at the sites previously occupied by the Z-bands. The second pattern of degeneration is characterized by disappearance of the Z-band followed by a fanning out of the myofilaments not associated with fragmentation of myofibrils. As atrophy of muscle fibres proceeds, acid phosphatase activity is localized in the perinuclear sarcoplasm. Macrophages show more intense acid phosphatase activity than do the muscle fibres. The formation of autophagic vacuoles is described and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222809
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 28
    Electronic Resource
    Electronic Resource
    Ultrastructure of the utriculi majores in the mushroom-shaped male accessory gland of Periplaneta americana (L.) (1974)
    Springer
    Cell & tissue research 147 (1974), S. 433-440 
    Details
    ISSN: 1432-0878
    Keywords: Mushroom-shaped gland ; Periplaneta ; Utriculi majores ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The utriculi majores, the largest tubules of the mushroom-shaped sex gland complex of P. americana are lined by a single layer of secretory cells with basal plasmalemmal infoldings and apical microvilli, and enveloped by a thin layer of slow-acting muscle. The latter is predominantly monomyofibrillar, with an ill-developed T-system, sarcoplasmic reticulum and striations. The secretory epithelium consists of typical protein-synthesizing and-exporting cells with an extensive rough endoplasmic reticulum and active Golgi elements. Secretory granules, budded off from layered cisternae of the Golgi complex, are more numerous in the vicinity of the luminal surface. The luminal contents are rich in proteins, neutral lipids and phospholipids; there are also some sulphated and nonsulphated acid mucopolysaccharides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307475
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 29
    Electronic Resource
    Electronic Resource
    The development and fine structure of the ultimobranchial glands in larval Rana temporaria L. (1974)
    Springer
    Cell & tissue research 148 (1974), S. 69-82 
    Details
    ISSN: 1432-0878
    Keywords: Ultimobranchial glands ; Anuran larvae ; Metamorphosis ; Ultrastructure ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of ultimobranchial (UB) gland cells from Rana temporaria larvae 48 h after hatching until the completion of metamorphosis is described. A single UB cell type is present, believed to be the characteristic C cell, in which secretory granules are first detectable in 8 day post-hatching larvae. These secretory granules show an intimate association with lipid droplets. Unusual membranous and crystalloid inclusions, which may represent yolk platelets, are found in UB glands of very small larvae. The significance of a range of UB organelles is discussed and some scanning electron micrographs presented. This report is believed to be the first published ultrastructural and scanning electron microscope study of larval anuran UB glands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224319
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 30
    Electronic Resource
    Electronic Resource
    Structure and ultrastructure of the central nervous system of the polychaete Nephtys, with special reference to photoreceptor elements (1974)
    Springer
    Cell & tissue research 149 (1974), S. 567-576 
    Details
    ISSN: 1432-0878
    Keywords: Photoreceptors ; Nervous system ; Polychaete ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Organs of presumed photoreceptor significance in Nephtys exhibit great simplicity. The pigmented eyes of Nephtys are embedded in the posterior region of the brain. Each consists of a pigment cup and two closely-associated sensory cells. The cells exhibit the characteristic features of rhabdomeric-type photoreceptor structures. The anterior or accessory eyes are identical to the pigmented eyes except that each may consist of only a single cell and that pigment cups are absent. A pair of “sensor sacs” is also present, embedded in the brain. Each consists of a single cell which has the appearance of possessing a large intracellular vesicle (the phaosome) into which project irregularly arranged microvilli. The limiting membrane is, in fact, continuous with the cell membrane. Evidence is presented of the secretion of material of unknown character into the vesicle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223033
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 31
    Electronic Resource
    Electronic Resource
    Electron microscopy of neurosecretory nerve fibres in the neural lobe of the embryonic mouse (1974)
    Springer
    Cell & tissue research 149 (1974), S. 333-347 
    Details
    ISSN: 1432-0878
    Keywords: Neural lobe ; Mouse ; Growth and development ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Nerve fibres of the neurosecretory hypothalamo-hypophyseal tract were studied in embryonic C3H mouse neural lobes; at least four glands at each gestational day 15–19 were examined. Single axons and small bundles of fibres are visible at gestational days 15 and 16. By day 17 large fibre bundles penetrate between glial cells. They increase in number during the next two days. Electron-lucent and electron-dense vesicles are seen in the fibres of the 15th and 16th gestational days. In the 17–19 day-old embryos development is characterized by a successive rise in the number of the two types of vesicles. The mean diameter of the electron-lucent vesicles is approximately unchanged in all the stages examined (50 nm). The electron-dense vesicles increase in size from approximately 80–90 nm at days 15–16 to 140 nm at the 19th gestational day. By day 19 contacts between neurosecretory fibre terminals and the outer basement membrane of internal and peripheral capillaries are occasionally observed. The possibly adrenergic nature of a few terminals contacting peripheral vascular structures in 17 and 18 day-old embryos is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226768
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 32
    Electronic Resource
    Electronic Resource
    A quantitative study of the ultrastructural changes in the hypothalamo-neurohypophysial system during and after experimentally induced hypersecretion (1974)
    Springer
    Cell & tissue research 149 (1974), S. 525-535 
    Details
    ISSN: 1432-0878
    Keywords: Supraoptic and paraventricular nuclei ; Ultrastructure ; Osmotic stimulus ; Quantitative study
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Substitution of a 2% solution of sodium chloride in place of drinking water for 3 days significantly increased both the size of neurosecretory neurones in the supraoptic and paraventricular nuclei of rats and the proportion of these cells which had dilated endoplasmic reticulum. There was an increase in the number of multivesicular bodies per mean cell profile and also an increase in the ratio of “dense” (immature) to “pale” (mature) neurosecretory granules within the perikarya, although the total numbers of granules were unchanged. If, after 3 days of saline-treatment, the rats were again allowed tap water to drink for 2 days, the proportion of cells showing dilated endoplasmic reticulum and the number of multivesicular bodies returned towards normal, but there was a significant increase in the number of large dense lysosomal bodies per cell profile and a relative increase in the proportion of “pale” (mature) neurosecretory granules. These changes suggest that the increased bio-synthetic activity resulting from saline-treatment subsides when the treatment is terminated. Furthermore, since neurohypophysial hormone stores have still not returned to normal in animals of the recovery group, they also imply the absence of an internal feedback system by which the level of neural lobe hormone stores might govern the synthetic activity of the neurosecretory cells. Both the increased synthesis, and the increased electrical activity which accompanies it, may be independent consequences of the depleting stimulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223030
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 33
    Electronic Resource
    Electronic Resource
    The biochemical nature of the cell periphery of the salt gland secretory cells of fresh and salt water adapted mallard ducks (1974)
    Springer
    Cell & tissue research 150 (1974), S. 193-211 
    Details
    ISSN: 1432-0878
    Keywords: Avian salt gland ; Electrolyte transport ; Ultrastructure ; Ruthenium red ; Dialyzed iron ; Sialic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Both ruthenium red and dialyzed iron techniques indicated that anionic protein-carbohydrates were associated with the plasmalemma of secretory cells in mallard salt glands. Digestion of the tissue with neuraminidase prior to dialyzed iron staining provided evidence that much of the anionic nature of this surface was due to sialic acid. These results were confirmed by biochemical assays showing that the salt-gland tissue contained a relatively high sialic-acid content and that the amount of sialic acid increased with salt-water adaptation. Possible roles of these anionic sites are discussed in relation to currently accepted hypotheses of electrolyte transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222170
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 34
    Electronic Resource
    Electronic Resource
    An ultrastructural analysis of early fertilization in the sand dollar, Echinarachnius parma (1974)
    Springer
    Cell & tissue research 150 (1974), S. 343-368 
    Details
    ISSN: 1432-0878
    Keywords: Fertilization ; Gametes ; Echinoid ; Echinarachnius ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The morphology of gametes of a representative echinoid, Echinarachnius parma were investigated ultrastructurally with particular emphasis on gamete interaction during fertilization. The acrosomal region of the spermatozoon is characterized by the presence of two components: an acrosomal vesicle and periacrosomal materials. The acrosomal vesicle, which is completely bounded by a limiting membrane, is surrounded by periacrosomal materials. Nuclear and mitochondrial regions of the spermatozoon are also described briefly. The ovum is surrounded by two extraneous coats: an outer jelly layer and an inner vitelline envelope. Pigment cells are present within the outer jelly layer. Ooplasmic organelles and inclusions including cortical granules and the female pronucleus are described. Spermatozoa undergo the acrosomal reaction in the vicinity of mature ova. Events of acrosomal reaction, including dehiscence of the acrosomal vesicle and acrosomal tubule formation, are described and summarized schematically. Acrosomal vesicle contents remain adherent to the outer surface of the tubule membrane. Primary binding of the spermatozoon to the surface of the ovum is accomplished by the establishment of morphological continuity between this extracellular coat and the vitelline envelope of the ovum. It is suggested that the species specificity of fertilization resides in this primary binding of gametes. Membrane fusion, between the tip of the acrosomal tubule and the colemma, follows primary binding and cytoplasmic continuity of the gametes is thereby established. It is concluded that the early events of fertilization in Echinarachnius parma generally conform to the Hydroides-Saccoglossus pattern of the Colwins (1967).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220142
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 35
    Electronic Resource
    Electronic Resource
    The fine structure of the ovarian follicle of Alloteuthis subulata Lam. (Mollusca, Cephalopoda) (1974)
    Springer
    Cell & tissue research 150 (1974), S. 463-479 
    Details
    ISSN: 1432-0878
    Keywords: Ovarian follicle ; Vitellogenesis ; Cephalopods ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Feinstruktur des Ovarfollikels von Alloteuthis subulata Lam. während der euplasmatischen Wachstumsphase und der Vitellogenese wurde licht- und elektronenmikroskopisch untersucht. Die Oogenese kann in drei Stadien unterteilt werden. Oocyten des Stadiums I haben noch kein Follikelepithel. Während des Stadiums II faltet sich das Follikelepithel in die Oocyte ein, die ihre euplasmatische Wachstumsphase durchläuft. Die Follikelzellen zeigen typische Merkmale von Zellen mit starker Proteinsynthese. Im Stadium III wird das Chorion von den Follikelzellen gebildet. Im Gegensatz zu älteren lichtmikroskopischen Beobachtungen ergeben sich keine Hinweise, die für eine Beteiligung der Follikelzellen an der Bildung exogenen Proteindotters sprechen. Die eigenen Beobachtungen sprechen vielmehr für eine weitgehend autonome Synthese des PAS-positiven Dotters durch die Oocyte unter Beteiligung des stark ausgebildeten Golgi-Apparates. Die Befunde werden im Vergleich mit Beobachtungen zur Vitellogenese anderer Invertebraten und Vertebraten diskutiert.
    Notes: Summary The structure of the ovarian follicle of Alloteuthis subulata Lam. during the euplasmic growth phase and vitellogenesis has been investigated by light and electron microscopy. Oogenesis can be divided into three stages. Oocytes of stage I are not yet surrounded by a follicle cell epithelium. During stage II, infolding of the follicular epithelium into the oocyte and the euplasmic growth phase of the oocyte take place. Follicle cells show all attributes typical for protein synthesizing cells. During stage III, formation of the chorion occurs due to follicle cell activity. In contrast to earlier light microscopical observations, there are no indications of an engagement of the follicle cells in the production of exogenous yolk protein, which could be taken up by the oocyte in pinocytotic vesicles. The observations rather favour the idea of a largely autonomous synthesis of the PAS-positive yolk in the oocyte. The Golgi apparatus seems to be engaged in yolk production. The findings are discussed in comparison with observations on vitellogenesis in other invertebrates and vertebrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225970
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 36
    Electronic Resource
    Electronic Resource
    Specific apocrine secretion in the anterior lobe of the prostate gland of rabbits (1974)
    Springer
    Cell & tissue research 151 (1974), S. 69-77 
    Details
    ISSN: 1432-0878
    Keywords: Prostate (rabbit) ; Anterior lobe ; Apocrine secretion ; Ultrastructure ; Protein secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The structure of glandular cells in the anterior lobe of the rabbit prostate was reinvestigated, especially after fixation by vascular perfusion with glutaraldehyde. The lumina of the gland contain abundant globules of an amorphous material surrounded by a membrane. A few dense bodies and scattered globules with internal vesicles also occur. These luminar contents obviously correspond to the particles observed in the semen of rabbits. Strong evidence was found for the formation of the globules by an apocrine secretory process. Material similar to the contents of the luminar globules accumulates in the cell apex together with vesicles, probably of Golgi origin, but without any other organelles. Protrusions from the cell surface contain similar material, but the vesicles generally disappear before the forming globule is finally pinched off from the cell surface. The characteristic feature of the secretory cell are the paucity of endoplasmic reticulum and the large amounts of ribosomes. This is interpreted as a specialization of the cell for the production of secretory protein that is not segregated within membranes until it is discharged from the cell by apocrine secretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222035
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 37
    Electronic Resource
    Electronic Resource
    The organization of the sarcoplasmic reticulum in teleost ventricular myocardial cells (1974)
    Springer
    Cell & tissue research 151 (1974), S. 395-402 
    Details
    ISSN: 1432-0878
    Keywords: Heart ; Teleost ; Sarcoplasmic reticulum ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The morphology of the sarcoplasmic reticulum in myocardial cells of the ventricle of the trout heart is described as the result of an investigation with the electron microscope. The sarcoplasmic reticulum is sparse in distribution compared to that of birds or mammals but shows a fundamentally similar organization. A very loose network of fine tubules is in intimate contact with the myofibrils but with no local modification with respect to the arrangement of myofilaments within the sarcomeres. There is no special association of the sarcoplasmic reticulum with the Z-bands. Some tubules pass to the cell periphery where they expand to form subsarcolemmal cisternae in which electron-dense matter is often seen. The occurrence of the subsarcolemmal cisternae (peripheral couplings) is random and they are not observed in the vicinity of intercalated discs. The sarcoplasmic reticulum is discussed in relation to excitation-contraction coupling in teleost myocardial cells, and in comparison with that of other vertebrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224549
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 38
    Electronic Resource
    Electronic Resource
    Function and ultrastructure of the nephridium of Hirudo medicinalis L. (1974)
    Springer
    Cell & tissue research 152 (1974), S. 385-401 
    Details
    ISSN: 1432-0878
    Keywords: Nephridium ; Hirudo medicinalis ; Central canal ; Urinary bladder ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Bei elektronenmikroskopischer Untersuchung des nephridialen Zentralkanals von Hirudo medicinalis L. können mehrere Kanalabschnitte unterschieden werden, die zum Teil frei im Bindegewebe liegen, wie der Anfangs-, der intermediäre und der Endkanal, oder aber durch mehr oder weniger enge Verzahnung mit Canaliculuszellen verbunden sind (innerer und weiter Kanal). Strukturen, die mit transzellulärem Ionentransport in Beziehung gebracht werden können — ikrovilli und basale Zellmembraneinfaltungen — finden sich in allen Kanalabschnitten. Während im Verlauf des Zentralkanals die Oberflächenvergrößerung durch Mikrovilli ziemlich konstant bleibt, findet sich in den Kanalabschnitten, die ausschließlich an Bindegewebe grenzen, eine besonders auffällige und signifikante Zunahme der basalen Oberflächenvergräßerung durch Zellmembraneinfaltungen. Es werden mögliche Besonderheiten im Reabsorptionsmechanismus diskutiert: Möglicherweise läuft zwischen dem Epithel des inneren und des weiten Kanals einerseits und den angrenzenden Canaliculuszellen andererseits ein Kreislaufprozeß für Ionen (recycling) ab.
    Notes: Summary The central canal and the urinary bladder of the leech Hirudo medicinalis (L.) were studied by electron microscopy. The central canal consists of several different parts: the initial, intermediate and terminal canal which border only on connective tissue, and the inner and the wide canal which on the other hand are closely connected to the canaliculus cells which produce the primary urine. Structures related to transcellular transport of solutes such as microvilli and basal plasma membrane infoldings in association with mitochondria have been found in all parts of the central canal. Evidence has been obtained that the surface enlargement by basal plasma membrane infoldings increases from the proximal to the distal parts of the central canal while the luminal surface enlargement remains nearly constant. The increasing basal surface enlargement is especially obvious in those parts of the central canal which border only on connective tissue. The mechanism of reabsorption is discussed with regard to physiological data so far available. A recycling process for solutes may take place between the epithelium of the inner and the wide canal on one hand and the bordering canaliculus cells on the other hand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223956
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 39
    Electronic Resource
    Electronic Resource
    Ultrastructural and fluorescence histochemical studies on the effects of 6-hydroxydopamine on the rat median eminence (1974)
    Springer
    Cell & tissue research 152 (1974), S. 493-512 
    Details
    ISSN: 1432-0878
    Keywords: Median eminence ; 6-Hydroxydopamine ; Fluorescence ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The extent of degeneration and regeneration of catecholamine-containing nerve fibres in the external layer of the median eminence of the rat has been assessed following treatment with 6-OHDA. Ultrastructural and fluorescence histochemical evidence suggests that nerve terminal degeneration occurs in the external layer of the caudal regions of the median eminence, including the anatomical stem, following intravenous injection of 6-OHDA in a dose of 100 mg/kg. No degeneration in the external layer of the median eminence was observed when the drug was given as sequential intracisternal injections to adult rats or neonatal rats by subcutaneous injections. The fluorescence histochemical studies suggest that regeneration of catecholamine-containing neurons is substantially complete within three weeks of treatment with intravenous 6-OHDA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218934
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 40
    Electronic Resource
    Electronic Resource
    The pineal gland of the mole (Talpa europaea L.) (1974)
    Springer
    Cell & tissue research 153 (1974), S. 277-292 
    Details
    ISSN: 1432-0878
    Keywords: Ultrastructure ; Pineal Gland ; Mole ; Paracrystalline structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les pinéalocytes (au sens strict: Wolfe, 1965) de l'épiphyse de la Taupe (animal vivant pratiquement toujours dans une complète obscurité) examinés au microscope électronique, ont été comparés à ceux d'autres Mammifères. Dans le périkaryon des mitochondries, des ribosomes, du réticulum endoplasmique lisse et granulaire et quelques lysosomes et inclusions lipidiques sont présents. La présence à l'intérieur de certaines cavités du réticulum endoplasmique granulaire et parfois entre les deux feuillets de l'enveloppe nucléaire, de structures paracristallines (de nature protéique ?) est caractéristique des pinéalocytes de cet animal. L'appareil de Golgi sécréte des vésicules claires de 500 à 1500 Å de diamètre. Quelques très rares grains de sécrétion, dont l'origine golgienne n'a pas encore été démontré, ont été observé dans le périkaryon et à l'extrémité de certains prolongements. Un grand nombre de structures ciliaires (9+0 paires de tubules) ont également été observés dans les pinéalocytes.
    Notes: Summary The ultrastructure of the mole pinealocytes, a mammal which lives practically in complete darkness, has been examined and compared with that of other mammals. Mitochondria, ribosomes, smooth and granular endoplasmic reticulum, lysosomes and lipid incluclusions are present in the perikaryon. The presence of a paracrystalline structure of a possibly proteinaceous nature in some cisterns of the granular endoplasmic reticulum and between the two layers of the nuclear membrane, is characteristic of the mole pinealocyte. The Golgi complex produces clear vesicles of 500–1500 Å in diameter. Occasionally, some dense core secretory vesicles were observed in the perikaryon and in the ending of cell processes. Their presumed origin from the Golgi complex could not yet be demonstrated. A large number of ciliary derivatives (9+0 pattern) are also present in the mole pinealocyte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229159
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 41
    Electronic Resource
    Electronic Resource
    Striated muscle cells in the guinea-pig iris (1974)
    Springer
    Cell & tissue research 154 (1974), S. 181-188 
    Details
    ISSN: 1432-0878
    Keywords: Striated muscle ; Iris ; Guinea pig ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Transverse sections of the sphincter pupillae of the guinea-pig iris show, among about 3000 smooth muscle cells, one or two cells with several features of striated muscle fibres. The myofilaments of these special, “striated” muscle cells have irregular and variable arrangements, but they are readily distinguishable from those of smooth muscle cells. The sarcoplasmic reticulum is conspicuous and is characterized by an electron dense content. “Striated” muscle cells show no nexuses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223163
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 42
    Electronic Resource
    Electronic Resource
    The goldfish pituitary (1974)
    Springer
    Cell & tissue research 154 (1974), S. 231-249 
    Details
    ISSN: 1432-0878
    Keywords: Pituitary ; Goldfish ; Innervation ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The innervation of the pituitary gland of Carassius auratus was studied by light and electron microscopy under various physiological and experimental conditions to investigate whether or not neurosecretory fibres play a role in regulating pars distalis function. Two types of neurosecretory fibre (Type A and Type B) were distinguished. Prolactin, ACTH and TSH1 cells were innervated by Type B fibre terminals separated from the endocrine cells by a continuous basal lamina (“indirect contacts”). Gonadotropic, STH and TSH2 cells were innervated by Type A as well as Type B neurosecretory fibres, mostly without an intervening basal lamina (“direct contacts”). The assessment of the amount of neurosecretory granules and microvesicles in nerve terminals during the pre-spawning, spawning and postspawning seasons and following the administration of Oestradiol, Thyroxine, Thiourea and Metopiron respectively revealed convincing evidence for a participation in pars distalis control for Type A and Type B fibres innervating gonadotropic cells and STH cells and Type B fibres innervating TSH2 and ACTH cells. Immediately after spawning both nerve fibre types innervating gonadotropic cells and Type A fibres innervating STH cells showed a striking decrease in the amount of dense core vesicles. During the spawning season nerve fibres innervating somatotropic cells, TSH2 cells and ACTH cells also undergo changes suggesting that prior to spawning major changes in the endocrine system of the goldfish take place.—These results point to a dual control, by peptides and amines, of teleost pars distalis function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223166
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 43
    Electronic Resource
    Electronic Resource
    The goldfish pituitary (1974)
    Springer
    Cell & tissue research 154 (1974), S. 211-230 
    Details
    ISSN: 1432-0878
    Keywords: Pituitary ; Goldfish ; Cell types ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the goldfish, Carassius auratus, morphological and functional aspects of the pituitary gland were studied at the ultrastructural level and six cell types could be distinguished in the pars distalis. Acidophilic cells of the rostral pars distalis were identified as prolactin cells, the chromophobic cells of the rostral pars distalis as ACTH cells, the non-globular basophilic cells of the rostral and the proximal pars distalis as TSH cells, the globular basophils of the proximal pars distalis as gonadotropic cells and the acidophils of the proximal pars distalis as somatotrophs. Besides some of the well established criteria of morphological and functional identification of different cell types, two new approaches have been used in the present study. One was to express the electron density of secretory granules objectively by means of a photometric method. It was found that both types of acidophilic cells which produce the proteohormones prolactin and somatotropin respectively, had granules with the highest electron densities. The basophilic cells producing the glycoproteins gonadotropin and TSH respectively, possessed granules of intermediate electron density whereas the chromophobic cells storing the peptide hormone ACTH had granules of lowest densities. The second new approach was the administration of the synthetic mammalian releasing hormones LH-RP and TRF, which helped in identifying gonadotropic and thyrotropic cells respectively. In the goldfish there is evidence for the presence of only one type of gonadotropic cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223165
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 44
    Electronic Resource
    Electronic Resource
    The ultrastructure of the skin of Tilapia mossambica (Peters) (1974)
    Springer
    Cell & tissue research 154 (1974), S. 251-264 
    Details
    ISSN: 1432-0878
    Keywords: Skin ; Tilapia ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of the skin of Tilapia mossambica (Peters) is described. In certain areas the epidermal surface forms so-called Epidermal Surface Patterns. Two types of epidermal cells are distinguished and their differences noted. The epidermal surface is covered by a layer of acid mucopolysaccharide, yet the contents of the mucus cells did not react with ruthenium red. The dermis consists mainly of bundles of collagen fibres and associated fibroblasts, but melanophores, iridophores and complex melano-iridophores are also present. Aspects of the development and structure of the guanine platelets and the melanosomes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223167
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 45
    Electronic Resource
    Electronic Resource
    Ultrastructure of the neurosecretory system of the Colorado potato beetle, Leptinotarsa decemlineata (Say) (1974)
    Springer
    Cell & tissue research 154 (1974), S. 289-301 
    Details
    ISSN: 1432-0878
    Keywords: Neurosecretory cells ; Leptinotarsa decemlineata ; Innervation ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pathways of axonal transport of secretions from neurosecretory cells (NSC) in the medial group (viz. A-, A1, B-, and C-type NSC) and the lateral group (L-type NSC) are described. Individual axons can be recognized in the electron microscope by the kind of neurosecretory particles they contain. In general, the secretions from the medial NSC are carried to the contralateral nervi corporis cardiaci (NCC), those from the lateral NSC to the ipsilateral NCC. Some axons from the A-type NSC, in addition, may run to ipsilateral NCC. All A-type axons have collaterals which run to the ipsilateral NCC. The medial and lateral bundles of “mixed” axons run through one paired NCC but remain separated spatially. Release of secretion from the C-type NSC can take place before the corpus cardiacum is reached. A- and A1-type NSC have additional collaterals that branch from the proximal part of the axons and penetrate deeply into the neuropile of the protocerebral lobes. Local swellings appear to be closely associated with fibers from non-neurosecretory neurons. The sites of contact are characterized by the accumulation of microvesicles (400 Å) near an electron-dense cleft of 150–200 Å width, and resemble regular chemical synapses. The microvesicles prove to be present within the neurosecretory fiber in most of the specimens studied, and within the non-neurosecretory fiber in only a few cases. It seems most likely that the collaterals in some phases convey afferent signals to the NSC which inhibit the release of an efferent neurochemical “messenger” of unknown nature into the neuropile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223727
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 46
    Electronic Resource
    Electronic Resource
    Synthesis and intracellular transport of proteins in the exocrine pancreas of the frog (Rana esculenta) (1974)
    Springer
    Cell & tissue research 155 (1974), S. 135-154 
    Details
    ISSN: 1432-0878
    Keywords: Exocrine pancreas ; Frog ; Ultrastructure ; Intracellular transport ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The route by which secretory proteins are transported in the frog exocrine pancreas cell was investigated by an ultrastructural and electron microscope autoradiographic analysis of in vivo 3H-leucine labelled tissue. The ultrastructure of the cell is characteristic of serous epithelial cells and resembles that of mammalian exocrine pancreas cells very closely. Autoradiographic results revealed that the proteins, after being synthesized in the rough endoplasmic reticulum (RER), are transported through the Golgi cisternae to condensing vacuoles which subsequently change into secretory granules. The determination of the timing of this transport was complicated by a very slow turnover of leucine in the frog. Nevertheless, by a semi-quantitative approach, some time characteristics could be estimated: about 11 min after the onset of their synthesis the proteins enter the Golgi system, and about 25 min later the condensing vacuoles. Secretory granules become labelled between 60 and 120 min. These results are discussed, also in relation to the transport route and kinetics in mammalian tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221350
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 47
    Electronic Resource
    Electronic Resource
    Investigations on the thyroid gland of embryonic larval and adult Ichthyophis glutinosus and Ichthyophis kohtaoensis (Gymnophiona, amphibia) (1974)
    Springer
    Cell & tissue research 155 (1974), S. 245-268 
    Details
    ISSN: 1432-0878
    Keywords: Thyroid gland ; Gymnophiona (Amphibia) ; Metamorphosis ; Ultrastructure ; Radioiodide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Different developmental stages of two species of the genus Ichthyophis have been investigated. In the late embryo the follicular cells of the thyroid gland exhibit various degrees of cytodifferentiation. Well differentiated cells show a polar organization and contain numerous granular inclusions, but a colloid-containing lumen is rare. Most cells at this stage contain large lipid inclusions. In young and older larvae the cells contain well-developed rough ER and Golgi systems, numerous mitochondria, and abundant granular and vesicular inclusions. Tentative identifications were made of primary lysosomes, secondary lysosomes, residual bodies, and two types of small apical vesicles—containing resorbed colloid or transporting material into the follicular lumen. In the larvae the number of apical microvilli is relatively high. The thyroid cells of the older larvae seem to contain more granular and vesicular inclusions than those of the younger larvae. In the adult the size of the follicles greatly increases, the height of the epithelium decreases, microvilli become rare, residual bodies are more frequent, and the small primary lysosomes are replaced by larger ones. Colloid droplets have been found only rarely in the cytoplasm of the thyroid cells of adult animals. In the immediate neighbourhood of the follicular epithelium, profiles of nerve fibres were found in all animals. Radioiodide investigations—measurements of conversion ratio and thyroid uptake factor—show, if compared with the results of corresponding studies in other amphibians, only relatively small differences between the larvae on the one hand and larvae and adults on the other. The absolute counts of the thyroid region are lowest in the adult and highest in the older larvae, shortly before metamorphosis. Furthermore our results indicate, on the basis of four animals tested, that in Ichthyophis the activity of the thyroid gland is temperature dependent. The results in Ichthyophis show that the classical stages of metamorphosis, in other amphibians characterized among other things by different levels of thyroid activity, are very indistinct in this animal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221358
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 48
    Electronic Resource
    Electronic Resource
    Ultrastructure of the nerve plexus in flatworms (1974)
    Springer
    Cell & tissue research 155 (1974), S. 337-351 
    Details
    ISSN: 1432-0878
    Keywords: Primitive nervous systems ; Nerve plexus ; Flatworm ; Platyhelminthes ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The peripheral nervous system of the polyclad flatworm Notoplana acticola is described from electron microscopic observations. There are two components, a subepithelial system and a submuscular plexus. The subepithelial system lies among muscle cells beneath the basement membrane of the epithelium. Axons and processes containing clear or dense-cored vesicles were found. The subepithelial system is in the form of a feltwork of fibers rather than a nerve-net. The submuscular plexus has both specialized and primitive aspects to its organization. In the former category are sheathed axons and complex synaptic configurations while the latter can be seen in the numerous naked axons, somata lying deep in the nerve tissue and islands of neuropil scattered along the nerve tracts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222810
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 49
    Electronic Resource
    Electronic Resource
    The hypothalamo-hypophysial system of hypophysectomized rats (1974)
    Springer
    Cell & tissue research 155 (1974), S. 541-554 
    Details
    ISSN: 1432-0878
    Keywords: Hypophysectomized rats ; Reorganized stalk ; Ultrastructure ; Salt load
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The reorganized stalk of hypophysectomized rats, either “intact” or subjected to a 6-day salt load, has been studied by light and electron microscopy. PAF-positive neurosecretory material is seen mainly in the periphery of the reorganized stalk, usually in 2–5 μ nerve swellings of animals operated two months before. Nerve swellings make contact with a dense capillary network. Three types of nerve fibres and their swellings are distinguished according to the size of elementary granules. Peptidergic A1 and A2 types contain granules with a maximum diameter of 170 and 130 nm respectively; monoaminergic B type fibres have granules of 100 nm in diameter. A1 type axonal swellings are the most numerous and can be tentatively divided into four subtypes according to their ultrastructure and relationships with capillaries and pituicytes. Swellings of types b and c, making direct contact with capillaries or pituicyte perikarya, usually contain few granules and numerous synaptic vesicles arranged frequently in clusters in the “active” zones. It is assumed that they are especially active in the release of peptide neurohormones. It is also hypothesized that in the hypophysectomized rats peptide neurohormones are released not only directly into the pericapillary space but also into the intercellular cleft, especially at sites of neuron-pituicyte junctions. Nerve swellings of type a, separated from the pericapillary space by thin pituicyte processes, usually contain numerous neurosecretory granules. It is suggested that vascular “end-feet” of pituicytes may somehow reduce neurohormone release. The depletion of PAF-positive material as well as the decreased granule content even after a salt load of only 1 per cent shows that the reorganized stalk is functional as a neurohaemal organ, but has a diminished hormone reserve. This, together with a primitive cytomyeloangioarchitecture speaks for morphological and functional imperfection of the reorganized stalk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227014
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 50
    Electronic Resource
    Electronic Resource
    On the interdigitating cells in the thymus-dependent area of the rat spleen: A relation between the mononuclear phagocyte system and T-lymphocytes (1974)
    Springer
    Cell & tissue research 148 (1974), S. 247-257 
    Details
    ISSN: 1432-0878
    Keywords: Spleen (Rat) ; Periarteriolar lymphocytic sheath ; Mononuclear phagocyte system (MPS) ; Thymectomy ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Light- and electron microscopic studies reveal that the peri-arteriolar lymphocytic sheath of the rat spleen can be divided into two areas. The central area contains small lymphocytes, interdigitating cells (IDC, light staining cells with extensive cytoplasmic interdigitations) and some scattered reticulum cells. The peripheral area contains a mixed population of lymphocytes and circumferentially oriented reticulum cells. It is shown that only the central area of the peri-arteriolar lymphocytic sheath is thymus-dependent. In neonatally thymectomized rats, before interdigitating cells appear, monocytes and promonocytes reside in this area. It is suggested that the IDC are part of the mononuclear phagocyte system (Langevoort et al., 1970). They probably form the micro-environment necessary for the differentiation and proliferation of T-cells. The analogies between IDC, epithelioid cells and the macrophages in the migration inhibition test are discussed. The hypothesis is put forward that these cells are similar in ultrastructural and functional aspects because all three are macrophages under the influence of humoral factors from T-cells, such as migration inhibition factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224586
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 51
    Electronic Resource
    Electronic Resource
    A comparative ultrastructural study of the pars tuberalis of various mammals, the chicken and the newt (1974)
    Springer
    Cell & tissue research 148 (1974), S. 313-329 
    Details
    ISSN: 1432-0878
    Keywords: Pars tuberalis ; Mammals ; Chicken ; Newt ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pars tuberalis of the rat, mouse, garden door mouse, European hamster, cat, cattle, chicken and newt is composed of two main cell types: specific secretory cells and follicular cells. The specific cells are characterized by comparable morphologic features in the investigated species, despite differences in the diameter of the secretory granulated vesicles; the ultrastructural morphology of these cells is different from that of any of the known cell types of the adenohypophysis. The follicular cells are devoid of secretory granules, they do not only line the numerous follicular cavities of the pars tuberalis but may also be found in the periphery of the cell cords (border cells). In addition, gonadotrophic cells are found; they predominate in the distal portion of the pars tuberalis and are definitely activated by castration or hypophysectomy. Experimental interventions on most of the major endocrine systems did not cause any noticeable ultrastructural changes in the specific cells. It appears certain that the pars tuberalis secretes a specific hormone whose function remains to be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224260
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 52
    Electronic Resource
    Electronic Resource
    Fine structure of the spermatozoon of the sea cucumber, Leptosynapta clarki (Echinodermata: Holothuroidea) (1974)
    Springer
    Cell & tissue research 149 (1974), S. 223-233 
    Details
    ISSN: 1432-0878
    Keywords: Spermatozoon ; Holothuroidea (Leptosynapta clarki) ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The spermatozoon of the holothurian Leptosynapta clarki has a small circular head measuring about 3.0 μ at the greatest diameter, a midpiece containing a single mitochondrion and a tail flagellum measuring between 35 μ and 45 μ in length. The acrosomal region contains a granule measuring 0.7 μ in diameter which consists of electron dense material arranged in concentric lamellae. Five concentric very electron dense lamellae alternate with areas of much less electron dense material in the central region of the granule. This granule rests in an anterior nuclear depression. The nucleus is circular in shape and contains one or two unbound vacuoles which frequently contain a fine granular material. Posteriorly the nucleus is bounded by a large mitochondrion and an occasional Golgi complex. The proximal centriole which contains a lateral arm of dense material lies in a deep fossa projecting into the nucleus. The distal centriole lies posteriorly in the mitochondrial mass and gives rise to nine satellite projections and their Y-shaped connective extensions. The tail contains the 9 + 2 tubule arrangement and tapers at its distal end.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222275
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 53
    Electronic Resource
    Electronic Resource
    The ultrastructure of the fenestra dorsalis of the syncarid crustaceans Allanaspides helonomus and Allanaspides hickmani (1974)
    Springer
    Cell & tissue research 147 (1974), S. 335-351 
    Details
    ISSN: 1432-0878
    Keywords: Fenestra dorsalis ; Allanaspides ; Syncarida ; Ion transport ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The genus Allanaspides (Crustacea, Syncarida) is characterised by a conspicuous modification of the cephalo-thoracic tergite, the fenestra dorsalis. The ultrastructure of the fenestra dorsalis was examined in both known species of Allanaspides. The organ is separated from surrounding tissue by a clearly demarcated transition zone in which the cuticle thickens and looses its normal laminated structure. In the cells of the fenestra dorsalis, three regions may be distinguished. The apical region has an abundance of long invaginations, often packed closely together. The invaginations possess numerous microtubules plus numerous mitochondria whose membranes are closely associated with the invaginated membranes. Both microtubules and mitochondria are aligned in the same direction as the invaginations. The middle region of the cells contains many intracellular vacuoles in Allanaspides hickmani whilst in Allanaspides helonomus the same region contains extensive extracellular spaces. The basal region of the cells is marked by deep infoldings and an abundance of mitochondria. Microtubules are common and these, together with the mitochondria, are aligned along the direction of the infoldings. Adjacent cells are linked by frequent septate junctions. The fine structure of fenestra dorsalis tissue indicates an active participation in ion and/or water movement. However, in contrast to other crustacean tissues known to be involved in this function, it is postulated that the fenestra dorsalis of Allanaspides provides a two-stage transport system, in which “mitochondrial pumps” are present on both the inner and outer cell surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307469
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 54
    Electronic Resource
    Electronic Resource
    Somatic spines in the supraoptic nucleus of the rat hypothalamus (1974)
    Springer
    Cell & tissue research 148 (1974), S. 203-211 
    Details
    ISSN: 1432-0878
    Keywords: Hypothalamus ; Rat ; Supraoptic nucleus ; Ultrastructure ; Somatic spines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electron microscopic studies of ultrathin serial sections of the perikarya and adjacent neuropil of neurons of the supraoptic nucleus (SON) of the adult male rat revealed varying forms of two types of somatic spines. One type forms synapses with axons passing the cell, the other, without synapses, appears to serve as a buttress or clasp for adjacent neuronal and glial processes. The synapse-bearing spines lack the usual spine apparatus but contain the flocculent substance often seen in spines. The other spines do not exhibit either of these structures. These somatic spines were also seen in Golgi impregnated preparations but the types could not be distinguished. Certain axons synapse either on a somatic spine of the perikarya or penetrate the glial sheath of the neuron and synapse, usually repeatedly, on the soma in an en passant manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224582
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 55
    Electronic Resource
    Electronic Resource
    Lanthanum binding by mouse cecal mucosa (1974)
    Springer
    Cell & tissue research 148 (1974), S. 309-311 
    Details
    ISSN: 1432-0878
    Keywords: Cecum ; Colon ; Lanthanum ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary After exposure of mouse cecal mucosa to lanthanum during primary fixation in glutaraldehyde, the metal was found as discrete particles covering microvilli and microorganisms, as a continuous layer outlining the lateral surfaces of epithelial cells, and as particles bound to collagen fibrils. The results suggest that lanthanum acts primarily as a stain of the surfaces of certain cells and extracellular structures, and to a lesser extent as an inert probe of the extracellular space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224259
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 56
    Electronic Resource
    Electronic Resource
    Intraependymal cerebrospinal fluid contacting neurons and axon terminals on the external surface in the filum terminale of the carp (Cyprinus carpio) (1974)
    Springer
    Cell & tissue research 148 (1974), S. 359-370 
    Details
    ISSN: 1432-0878
    Keywords: Cerebrospinal fluid contacting neurons ; Filum terminale (Cyprinus carpio) ; Ultrastructure ; Synaptic semidesmosomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Small nerve cells are scattered among the ependymal cells of the central canal of the filum terminale in Cyprinus carpio. The dendrites of these neurons form bulb-like endings in the cerebrospinal fluid (CSF). These endings are similar to the CSF contacting dendritic terminals of the medulla oblongata and spinal cord. Therefore, we consider these nerve cells to belong to the CSF contacting neuronal system. The axons of these neurons enter the hypendymal fibrous zone where nerve processes of various calibres and axon terminals on dendrite-like profiles and sometimes on ependymal processes were found. In addition to cytoplasmic elements ordinarily present in nerve cells there are granulated vesicles of about 800 to 900 Å in diameter in the perikarya of the CSF contacting neurons. Axons containing synaptic and dense-core vesicles (diameter about 400 Å and 800 Å, respectively) build up synapses on the basal part of these neurons. The CSF contacting neurons described are dissimilar to the Dahlgren cells present in the urophysis and in the rostral part of the filum. In addition, we found axon terminals forming synaptic semidesmosomes on the basal lamina of the external surface of the filum. At some places these terminals are numerous, building up primitive median eminence-like areas on the surface of the filum. In addition to synaptic vesicles these terminals contain numerous granulated vesicles of 800 Å. The axons forming these terminals are supposed to originate from the CSF contacting neurons. The presence of special nerve terminals on the external surface furnishes morphological evidence for the passage of substances from the nervous tissue into the external CSF space at the level of the filum terminale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224263
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 57
    Electronic Resource
    Electronic Resource
    Ultrastructure of the photoreceptor of the planarian Dugesia dorotocephala (1974)
    Springer
    Cell & tissue research 148 (1974), S. 143-158 
    Details
    ISSN: 1432-0878
    Keywords: Photoreceptor ; Planaria ; Neurotubules ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The photoreceptors of the planarian Dugesia dorotocephala were studied by light microscopy and electron microscopy. The eye was found to be rhabdomeric; it is composed of approximately 25 visual cells and a monolayered cup of pigment cells enclosing the light sensitive rhabdome. The pigment cell gave the appearance of having a phagocytic function in addition to regulating the light entering the rhabdome. Extensions of these pigment cells were shown to be the “membranous structure” seen by light microscopy in the open area of the eye. The bipolar visual cell consisted of a perikaryon, axon and a dendritic extension comprised of a stalk, conical body and microvillous rhabdomere. Efferent nerve fibers formed synapses with dendritic spines protruding from receptor stalks. A specialized structure at the transition area between neurotubules and neurofilaments was observed in the conical body. A dense intercellular space occurred between all regions of adjoining visual cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224579
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 58
    Electronic Resource
    Electronic Resource
    Morphogenesis of the syncytium in the mouse placenta (1974)
    Springer
    Cell & tissue research 148 (1974), S. 381-396 
    Details
    ISSN: 1432-0878
    Keywords: Placenta ; Mouse ; Syncytium ; Morphogenesis ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé L'origine embryologique des constituants cytologiques de la barrière placentaire chez la Souris a été mise en évidence du 8ème au 11éme jour de la gestation et la séquence des phénomènes favorisant la formation d'un syncytium trophoblastique, précisée. La barrière placentaire trilaminaire a une double origine: la couche interne provient du trophoblaste chorionique, la couche médiane syncytiale comme la couche externe dérivent du trophoblaste ectoplacentaire. Le stimulus initial de la différenciation semble résulter au 9ème jour du contact entre le trophoblaste chorionique et le mésoderme allantoïdien. Quelques heures après, on observe la réaction des cellules chorioniques, caractérisée par une augmentation importante des nucléoprotéines cytoplasmiques, puis l'apparition de globules lipidiques et enfin des propriétés de motilité. Ces cellules établissent des jonctions complexes avec le trophoblaste ectoplacentaire indifférencié qu'elles côtoient. En même temps, le métabolisme nucléaire de ces cellules ectoplacentaires semble modifié. Ultérieurement, au 10éme jour de la gestation, la disparition des membranes plasmiques latérales de ces cellules, conduit à la formation d'un syncytium par fusion de cellules au même stade d'évolution.
    Notes: Summary The morphogenesis of the different layers forming the mouse placental barrier is described during the 8th to 11th day of gestation. The timing and events leading to the formation of the syncytiotrophoblast are analyzed. Two different processes lead to the formation of the hemotrichorial placental membrane: the internal layer is formed by the chorionic trophoblast, both the intermediate syncytial layer and the external cytotrophoblast layer are derived from the ectoplacental trophoblast. The differentiation of the placental barrier begins on the 9th day of gestation by the establishment of contact between the chorionic trophoblast and the allantoic mesoderm. A few hours later, the chorionic cells show a considerable increase in cytoplasmic nucleoproteins and lipids and become ameboid. Complex cell-junctions differentiate between these chorionic cells and the adjacent ectoplacental trophoblast. On the 10th day of gestation the lateral cytoplasmic membranes disappear leading to the formation of a syncytium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224265
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 59
    Electronic Resource
    Electronic Resource
    Morphology and ultrastructure of the antenna of male Periplaneta americana as related to chemoreception (1974)
    Springer
    Cell & tissue research 150 (1974), S. 1-9 
    Details
    ISSN: 1432-0878
    Keywords: Sensory receptors ; Insects ; Chemoreceptors ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary On the antenna of adult male Periplaneta americana, three size ranges of classical sensilla basiconica were found. Based on SEM, a sensillum of the s. trichodeum shape was revealed, but our TEM efforts indicate that this sensillum has the thin-wall, porous ultrastructure of a sensillum basiconicum. Sensilla basiconica contain flask-shaped cuticular pores. All viewed pores join four or five tubules. The pore tubules clearly contact plasma membranes of dendritic branches. Two sizes of grooved pegs were observed. The terminal segment of the antenna contains a variety of other “receptors”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220376
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 60
    Electronic Resource
    Electronic Resource
    In vitro maturation of Arbacia punctulata oocytes and initiation of heavy body formation (1974)
    Springer
    Cell & tissue research 150 (1974), S. 271-279 
    Details
    ISSN: 1432-0878
    Keywords: Heavy bodies ; Oogenesis ; Maturation ; Sea urchin ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An ultrastructural study of in vitro maturation of A. punctulata oocytes was undertaken to determine when heavy body formation was initiated. No heavy bodies were seen in germinal vesicle oocytes or in oocytes undergoing germinal vesicle breakdown or polar body formation. Heavy bodies were only observed in ova examined one to two hours after pronuclear formation. Several small heavy bodies were seen in sections of eggs fixed as early as three hours after the pronucleus had formed. The number of these structures in the egg cytoplasm increased with time. Therefore it is concluded that heavy body formation in sea urchin ova is a phenomenon following nuclear maturation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222175
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 61
    Electronic Resource
    Electronic Resource
    Haematopoiesis in the freshwater snail Lymnaea stagnalis studied by electron microscopy and autoradiography (1974)
    Springer
    Cell & tissue research 150 (1974), S. 443-454 
    Details
    ISSN: 1432-0878
    Keywords: Haematopoiesis ; Lymnaea stagnalis ; Amoebocytes ; Autoradiography ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In order to investigate haematopoiesis in the freshwater pulmonate Lymnaea stagnalis, the blood cells and the connective tissue of this snail were studied by light and electron microscopy as well as by autoradiography. In the circulating blood only one type of cell, the amoebocyte, is present. Amoebocytes also occur in the connective tissue (tissue amoebocytes) as single cells, in small groups or in large accumulations. Study of the morphology and ultrastructure of blood and tissue amoebocytes shows that no differences exist between these cells, indicating that L. stagnalis does not possess a well-defined haematopoietic organ. This assumption is supported by the following observations: 1. both blood and tissue amoebocytes can act as phagocytes, 2. blood and tissue amoebocytes both have the capacity to divide (i.e. incorporate tritiated thymidine) and 3. the percentage of dividing cells in the blood and in the connective tissue is the same. These quantitative data indicate furthermore that there is no difference in the relative importance of the blood and the connective tissue in the process of haematopoiesis. Comparison of tritiated thymidine labelled cells with unlabelled amoebocytes showed that these cells do not differ with respect to their morphology and ultrastructure. Moreover, amoebocytes involved in phagocytosis and encapsulation of foreign materials or in wound healing still have the capacity to divide. The percentages of tritiated thymidine labelled amoebocytes in different snails varied considerably. It is suggested that this variation reflects differences in the physiological state of the individual snails.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225968
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 62
    Electronic Resource
    Electronic Resource
    Pituitary ultrastructure and serum gonadotropin levels in the PMS-primed immature rat (1974)
    Springer
    Cell & tissue research 151 (1974), S. 79-92 
    Details
    ISSN: 1432-0878
    Keywords: Adenohypophysis ; PMS-primed rat ; FSH gonadotrope ; LH gonadotrope ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The existence of distinct FSH and LH gonadotropes has been suggested by several investigators whereas others have supported a one-gonadotrope hypothesis. To obtain further clarification on this subject, ultrastructural studies of pituitaries and radioimmunoassays of serum FSH, LH and prolactin were carried out in the PMS treated immature rat. The surge of FSH began at 12 noon on day 32 with a maximum at 6 pm that continued into the next day, while the LH maximum was reached at 4 pm. The serum levels of prolactin also began to rise at 12 noon on day 32 but did not reach maximum until 8 am of day 33. FSH cells as defined earlier by Costoff (1973) were well granulated at 12 noon and at 4 pm on day 32. At this later time many FSH cells exhibited extensive Golgi complexes, hypertrophied vacuolar endoplasmic reticulum and often times greatly swollen mitochondria. At 7 PM of day 32 many FSH cells were in various stages of degranulation. LH cells were enlarged and well granulated prior to 12 noon of day 32 but thereafter appeared degranulated. On day 31, prolactin cells were enlarged and well granulated. Although these cells contained extensive endoplasmic reticulum and Golgi complexes, there were few mature granules during day 32 and in the early morning hours of day 33. At 1 PM of day 33 most of the FSH and LH, and some prolactin cells were again granulated. These studies correlating ultrastructure with FSH and LH levels in the serum of PMS treated rats further suggest the existence of two distinct gonadotropes in the rat, one producing FSH and another LH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222036
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 63
    Electronic Resource
    Electronic Resource
    Estrogen-induced transformation of somatotrophs into mammotrophs in the rat (1974)
    Springer
    Cell & tissue research 152 (1974), S. 229-238 
    Details
    ISSN: 1432-0878
    Keywords: Pituitary gland (rat) ; Estrogen administration ; Somatotroph and mammotroph ; Ultrastructure ; Radioautography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the normal male rat pituitary tritiated thymidine labeled mainly STH cells (somatotrophs), no labeled prolactin cell was found. Following estradiol treatment for 21 days tritiated thymidine labeled mainly prolactin cells (mammotrophs). To determine the origin of these mammotrophs tritiated thymidine was given before the estradiol treatment started, thus labeling many somatotrophs. After 21 days of estradiol, out of 42 labeled cells, 14 were mammotrophs and 13 were somatotrophs; these results suggest that there might be a true transformation of somatotrophs into mammotrophs under the influence of estradiol or that there exist two types of somatotrophs: 1) a committed somatotroph which is not transformed by estrogen treatment, and 2) an uncommitted mammosomatotroph, which under normal conditions bears the features of a somatotroph, but which transforms into a mammotroph under the influence of estradiol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224697
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 64
    Electronic Resource
    Electronic Resource
    Fine structure of the fat body of the female of Calliphora erythrocephala during the first egg-maturation cycle (1974)
    Springer
    Cell & tissue research 152 (1974), S. 193-217 
    Details
    ISSN: 1432-0878
    Keywords: Imaginal fat body ; Calliphora erythrocephala ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary During the first egg-maturation period (6 days at 25° C) the adult fat body of the female of Calliphora goes through sequential changes correlated with the development of the oocytes. The first two days represent a growth and differentiation phase. Free ribosomes and rough endoplasmic reticulum (RER) gradually increase in quantity. Golgi complexes consisting of clusters of vesicles and vacuoles appear to bud off from cisternae of the RER. Dense bodies possibly arise by sequestration from Golgi complexes. Content of acid phosphatase shows the dense bodies to be lysosomes. Many contain crystalloids. Glycogen is first seen as a network, in which gamma-elements appear; later alpha-particles occur. Lipid droplets are abundant. Lipid droplets break down where they border upon glycogen. In four-day old females the fat body is in a phase of production. Golgi complexes concentrate protein secretion granules believed to represent yolk protein. Then follows a phase of regression characterized by the formation of cytosegresomes and by an accumulation of lipid. In mature females a remodeling of the fat cell begins, evidenced by a renewed formation of free ribosomes, RER, and probably dense bodies resembling those of the one-day old female.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224695
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 65
    Electronic Resource
    Electronic Resource
    Electron microscopical and cytochemical study of vitelline cells in the fresh-water triclad Dugesia lugubris s.l. (1974)
    Springer
    Cell & tissue research 152 (1974), S. 219-228 
    Details
    ISSN: 1432-0878
    Keywords: Vitelline cells ; Dugesia lugubris (Turbellaria, Tricladida) ; Yolk material ; Ultrastructure ; Cytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The development of vitelline cells in the fresh-water Triclad Dugesia lugubris has been studied by means of electron microscopic and cytochemical techniques. We observed a single cell type in different stages of development more or less evenly distributed from the periphery towards the centre of the follicles. Young vitelline cells have the characteristic morphology of cells in early stages of maturation: they show a large nucleus, a nucleolus with fibrillar and granular components, and many ribosomes in an undifferentiated cytoplasm. Subsequently, large amounts of parallel arrays of granular endoplasmic reticulum and some Golgi complexes appear and the vitelline cells assume the typical appearance of secretory cells. Reserve substances progressively accumulate in the vitelline cells, which when mature appear very electron dense. We have recognized the following types of reserve substances: 1) Neutral lipid droplets which are the first to appear and can reach a diameter of 4–5 μm or more. 2) Yolk globules of 2–3 μm in diameter which appear simultaneously with cocoon-shell globules but are clearly different from them in structure and chemical composition. The yolk globules probably arise from the cooperation between endoplasmic reticulum and Golgi complexes and have a very complex proteinaceous nature. 3) Large amounts of α-glycogen granules which occupy cytoplasmic sacs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224696
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 66
    Electronic Resource
    Electronic Resource
    Interdigitating cells in the white pulp of the human spleen (1974)
    Springer
    Cell & tissue research 153 (1974), S. 415-417 
    Details
    ISSN: 1432-0878
    Keywords: Spleen (human) ; Periarteriolar lymphocytic sheath ; Reticular cell ; Enzyme histochemistry ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Interdigitating cells are demonstrated as a special type of fixed cell in the periarteriolar lymphocytic sheaths of the human spleen. These cells show typical ultrastructural features as well as a characteristic enzyme histochemical pattern that distinguish them from other reticular cells in the splenic white pulp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229168
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 67
    Electronic Resource
    Electronic Resource
    Fine structure of the testicular gland of the black goby, Gobius jozo L. (1974)
    Springer
    Cell & tissue research 154 (1974), S. 39-49 
    Details
    ISSN: 1432-0878
    Keywords: Gobius jozo (Teleost) ; Testis ; Steroidogenic tissue ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The homologue of mammalian Leydig cells in the testis of fish of the genus Gobius is believed to be a glandular mass lying along the mesorchium and quite distinct from the seminiferous region. This gland was studied in Gobius jozo by light and electron microscopy. Histologically, the gland is composed of cords of polyhedral cells located between the main vessels of the testis and the deferent duct. Dark and light cell varieties were observed both after staining with toluidine blue and with respect to their cytoplasmic electron density. The fine structure of the glandular cells is characterized by a well developed agranular endoplasmic reticulum in the form of random anastomosing tubules and vesicles and by very numerous mitochondria with tubulo-vesicular cristae. In some mitochondria the internal organization is paracrystalline. One or two bodies of unknown nature are Found in the Golgi region. They are partially limited by an unusually thick membrane and contain a material subdivided mostly into small vesicles. Liposomes and lipofuscin pigment granules are also present. The ultrastructural features of the glandular cells of the testis of Gobius jozo confirm a specialization in steroid hormone production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221070
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 68
    Electronic Resource
    Electronic Resource
    Über Reaktionen des Bis(trifluormethyl)diazomethan mit SulfonylisocyanatenFrau Professor Margot Becke-Goehring zum 60. Geburtstage gewidmet (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 299-306 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Reactions of Bis(trifluoromethyl)diazomethane with SulfonylisocyanatesSulfonylisocyanates RSO2NCO (B = F, Cl, CF3) react with (CF3)2CN2 at 100-160°C to give l,2,3-oxathiazole-4-one-2-oxidesWhile the ring IIa is cleaved by methanol (formation of FSO2—NH—C(O)—C(CF3)2OH) with waterThe proton of the compound V might be substituted by metal atoms, especially the silver salt is suitable for the preparation of further 1,2,3-oxathiazoline-4-one-2,2-dioxides.
    Notes: Sulfonylisocyanate RSO2NCO (E = Cl, F, CF3) reagieren mit (CF3)2CN2 bei 100-160°C zu 1,2,3-Oxathiazol-4-on-2-oxidenWährend der Ring IIa mit Methanol gespalten wird (Bildung von FSO2—NH—C(O)— C(CF3)2OH), erhält man bei der Umsetzung mit WasserDas Proton dea Hydrolyseprodukts läßt sich durch Metallatome ersetzen, besonders das Silbersalz eignet sich zur Darstellung weiterer 1,2,3-Oxathiazolin-4-on-2,2-dioxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744060224
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 69
    Electronic Resource
    Electronic Resource
    Darstellung und Schwingungsspektrum von Tetrathiomethyl-phosphonium-hexachloroantimonatFrau Professor Margot Becke-Goehring zum 60. Geburtstage gewidmet (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 307-311 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Vibrational Spectrum of Tetra-thiomethyl-phosphoniuin-hexachloroantimonatePreparation, properties and vibrational spectrum of Tetra-thiomethyl-phosphonium-hexachloroantimonate are reported. The kind of bonding in the ion is brief discussed.
    Notes: Es wird über die Darstellung, Eigenschaften und Schwingungsspektren des Tetra-thiomethyl-phosphonium-hexachloroantimonats berichtet. Die Bindungsverhältnisse werden kurz diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744060225
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 70
    Electronic Resource
    Electronic Resource
    Masthead (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 407 (1974) 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744070101
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 71
    Electronic Resource
    Electronic Resource
    Tricyclische Übergangsmetallkomplexe mit Silicium-haltigen Ringsystemen: Die Strukturen von Ni(C6H17N5S4Si2) und Co(C4H12N4S4OSi2)Frau Professor Margot Becke-Goehring zum 60. Geburtstage gewidmet (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 319-328 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tricyclic Transition Metal Complexes with Ring Systems Containing Silicon: The Structures of Ni(C6H17N5S4Si2) und Co(C4H12N4S4OSi2)Crystals of Ni(C6H17N5S4Si2) 3 b are orthorhombic, space group Pbcn, with a = 10.341, b = 11,650, c = 14.163 Å and Z = 4 and crystals of Co(C4H12N4S4OSia) 4b are monoclinic, space group P21/c, with a = 7.304, b = 17.866, c = 11.805 Å, β = 100.88° and Z = 4. The structures have been determined by an X-ray crystallographic analysis and were refined to R = 0.060 for 3b and 0.114 for 4b. The two almost planar MN3S2 chelate rings per molecule intersect with an angle pf 16.2° in 3 b and 27.0° in 4 b. The six-membered rings containing silicon are puckered in such a way that both molecules exhibit (approximate) C2 symmetry.
    Notes: Der Komplex Ni(C6H17N5S4Si2) 3b kristallisiert in der orthorhombischen Raumgruppe Pbcn mit a = 10.341, b = 11.650, c = 14.163 Å und Z = 4 und der Komplex Co(C4H12N4S4OSi2) 4b kristallisiert in der monoklinen Raumgruppe P21/c mit a = 7.304, b = 17.866, c = 11,805 Å, β= 100.88° und Z = 4. Die Strukturen wurden röntgenographisch bestimmt und bis zu R = 0.060 bzw. 0.114 verfeinert. Die praktisch ebenen MN2S2-Chelatringe bilden Flächenwinkel von 16.2° in 3b und 27.0° in 4b. Die Silicium enthaltenden sechsgliedrigen Ringe sind derart gewellt, daß beide Moleküle die (angenäherte) Eigensymmetrie C2 aufweisen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744060227
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 72
    Electronic Resource
    Electronic Resource
    Über Neue Hexafluororhodate(IV): AIIRhIVF6 (AII = Ba, Sr, Ca, Mg, Zn, Cd, Hg, Ni sowie Cu) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 407 (1974), S. 13-22 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Novel Hexafluoro Rhodates(IV): AIIRhIVF6. (AII = Ba, Sr, Ca, Mg, Zn, Cd, Hg, Ni, Cu)We obtained hithertoo unknown BaRhF6 and SrRhF6 (both lemon yellow) of (hexag.) BaSiF6-Type [a = 7.379, c = 7.211Å bzw. a = 7.157, c = 6.948 Å] as well as CaRhF6 (light yellow) [a = 5.267, c = 14.612 Å], MgRhF6 (light yellow) [a = 5.027, c 13.511Å], ZnRhF5 (light yellow) [a = 4.996, c = 13.683 Å], CdRhF6 (light yellow) [a = 5.,128 c = 14.447 Å], HgRhF6 (orange) [a = 5.133, c = 14.676 Å], NiRhF6 (light brown) [a = 4.960, c = 13.514 Å] all of (hexag.) LiSbF6-type. The strukture of CuRhF6 (light brown) is yet unknown.
    Notes: Neu dargestellt wurden BaRhF6 und SrRhF6, beide zitronengelb, (hexag.) BaSiF6-Typ [a = 7,379, c = 7,211 Å bzw. a = 7,157, c = 6,948 Å] sowie CaRhF6 (hellgelb) [a = 5,267, c = 14,612 Å], MgRhF6 (hellgelb) [a = 5,027, c = 13,511 Å], ZnRhF6 (hellgelb) [a = 4,996, c = 13,683 Å], CdRhF6 (hellgelb) [a = 5,128, c = 14,447 Å], HgRhF6 (orange) [a = 5,133, c = 14,676 Å], NiRhF6 (hellbraun) [a = 4,960, c = 13,514 Å], alle (hexag.) LiSbF6-Typ. Von CuRhF6 (hellbraun) ist die Struktur bislang unbekannt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744070103
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 73
    Electronic Resource
    Electronic Resource
    Über Hexafluoroferrate(III): Cs2TlFeF6, Cs2KFeF6, Rb2KFeF6, Rb2NaFeF6 und Cs2NaFeF6 (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 407 (1974), S. 305-312 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Hexafluoroferrates(III): Cs2TlFeF6, Cs2KFeF6, Rb2KFeF6, Rb2NaFeF6, and Cs2NaFeF6New prepared are the compounds Cs2TlFeF6 (a = 9.211 Å), Cs2KFeF6 (a = 9.041 Å), Rb2KFeF6 (a = 8.868 Å) and Rb2NaFeF6 (a = 8.46 4Å) all cubic Elpasolithes as well as Cs2NaFeF6 (Cs2NaCrF6-type, hexagonal with a = 6.281, c = 30.532 Å), all colourless. Cs2KFeF6 was measured magnetically (70-297,2 K). The spectra of reflection were measured (9000-36000 cm-1). The Madelung Part of Lattice Energy, MAPLE, is calculated and discussed.
    Notes: Neu dargestellt wurden Cs2TlFeF6 (a = 9,211 Å), Cs2KFeF6 (a = 9,041 Å), Rb2KFeF6 (a = 8,868 Å) und Rb2NaFeF6 (a = 8,464 Å) alle kubische Elpasolith-Vertreter, sowie Cs2NaFeF6 (Cs2NaCrF6-Typ, hexagonal mit a = 6,281, c = 30,532 Å) als farblose Pulver. Cs2KFeF6 wurde magnetisch vermessen (70 bis 297,2 K). Das Reflexionspektrum von FeF3 wurde gemessen (9000 bis 36000 cm-1). Der Madelunganteil der Gitterenergie, MAPLE, wird berechnet und diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744070306
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 74
    Electronic Resource
    Electronic Resource
    Neue Elpasolithvertreter mit CoIII: Cs2KCoF6, Rb2KCoF6, Rb2NaCoF6 (mit einer Notiz über Cs2NaCoF6) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 407 (1974), S. 313-318 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Elpasolithes with CoIII: Cs2KCoF6, Rb2KCoF6, Rb2NaCoF6 (with a Notice on Cs2NaCoF6)New prepared are the compounds Cs2KCoF6 (a = 8.979 Å), Rb2KCoF6 (a = 8.809 Å), Rb2NaCoF6 (a = 8.421 Å), all cubic Elpasolithes, as well as Cs2NaCoF6 (Cs2NaCrF6-type, hexagonal with a = 6.23, c = 30.32 Å) all of light blue colour. Cs2KCoF6 (72.7-299.7 K) and Rb2KCoF6 (71.4-298.0 K) have been measured magnetically. The Madelung Part of Lattice Energy (MAPLE) is calculated and discussed.
    Notes: Neu dargestellt wurden Cs2KCoF6 (a = 8,979 Å), Rb2KCoF6 (a = 8,809 Å), Rb2NaCoF6 (a = 8,421 Å), alle kubische Elpasolith-Vertreter, sowie Cs2NaCoF6 (Cs2NaCrF6-Typ, hexagonal mit a = 6,23, c = 30,32 Å) als hellblaue Pulver. Cs2KCoF6 (72,7 bis 299,7 K) und Rb2KCoF6 (71,4 bis 298,0 K) wurden magnetisch vermessen. Der Madelunganteil der Gitterenergie, MAPLE, wurde berechnet und diskutiert.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744070307
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 75
    Electronic Resource
    Electronic Resource
    Uber Chalkogenolate. LXVII. Alkalimetall- und Erdalkalimetallglykolate (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 407 (1974), S. 319-326 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Chalkogenolates. LXVII. Glycolates of Alkali Metals and Alkaline Earth MetalsThe glycolates \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} {\rm M}^{\rm I} [{\rm OCH}_{\rm 2} {\rm CH}_{\rm 2} {\rm OH}]{\rm with M}^{\rm I} = {\rm Li, Na, K} \\ \mathop {\rm M}\nolimits_{\rm 2}^{\rm I} [{\rm OCH}_{\rm 2} {\rm CH}_{\rm 2} {\rm O}]{\rm with M}^{\rm I} = {\rm Li, Na, K, Tl} \\ {\rm M}^{{\rm II}} [{\rm OCH}_{\rm 2} {\rm CH}_{\rm 2} {\rm O}]{\rm with M}^{{\rm II}} = {\rm Mg, Ca, Sr, Ba} \\ \end{array} $$\end{document} have been prepared and characterized by different methods. The IR spectra have been assigned.
    Notes: Nach verschiedenen Methoden wurden die Glykolate \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} {\rm M}^{\rm I} [{\rm OCH}_{\rm 2} {\rm CH}_{\rm 2} {\rm OH}]{\rm mit M}^{\rm I} = {\rm Li, Na, K}\\ \mathop {\rm M}\nolimits_{\rm 2}^{\rm I} [{\rm OCH}_{\rm 2} {\rm CH}_{\rm 2} {\rm O}]{\rm mit M}^{\rm I} = {\rm Li, Na, K, Tl}\\ {\rm M}^{{\rm II}} [{\rm OCH}_{\rm 2} {\rm CH}_{\rm 2} {\rm O}]{\rm mit M}^{{\rm II}} = {\rm Mg, Ca, Sr, Ba} \end{array} $$\end{document} hergestellt und charakterisiert. Die IR-Spektren wurden zugeordnet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744070308
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 76
    Electronic Resource
    Electronic Resource
    Zur Metallierung der PH2-Gruppe in SilylphosphinenHerrn Prof. Dr. H. Hartmann zum 60. Geburtstage gewidmetVorbericht: Z. anorg. allg. Chem. 405, 337 (1974). (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 407 (1974), S. 266-286 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metallation of the PH2 Group in Silylphosphines1. The silylphosphines (CH3)2HSi—PH2, CH3H2Si—PH2, H3Si—PH2 react with LiP(C2H5)2 (molar ratio 1:2, in diglyme, at low temperature) yielding e.g. H3Si—PLi2 following eq. (1). These react with CH3Cl acc. to eq. (2).2. (CH3)nH3-nSi—PHLi compounds are readily obtained by reaction of PH2-containing silylphosphines with LiPHCH3 following eq. (3), since LiPHCH3 does not react to form dimetallated derivatives (low base-strength).3. Solutions of the monometallated silylphosphines in mono-, di-, or triglyme disproportionate according to eq. (4) either on warming to room temperature, or adding nonpolar solvents. The disproportionation reactions attain equilibria eq.(4).4. Etherates of the metallated disilylphosphines as e. g. [(CH3)3Si]2PLi · 1 monoglyme may be isolated on evaporating the solvent. In benzene solution these compounds react with CH3Cl to form disilymethylphosphines as shown in eq. (5). Halosilanes react to form trisilylphosphines acc. to (6).5. Reactions of AlCl3 with the monometallted monosilylphosphines [formed acc. to (3)] in diglyme follow eq. (7). Diglyme solutions of LiAl(PHSiH3)4 or LiAl(PHSiH2CH3)4 are stable at room temperature and react with CH3Cl or halosilanes to yield the corresponding P—H derivatives acc. to eq. (8). Compounds containing Al—P(SiH3)2- and Al—PH2- moieties, partially formed in the AlCl3 reaction because of eq. (4), react with halosilanes in a manner similar to eq. (8) yielding tri- and monosliylphosphines respectively. The latter compounds are also formed by partial disproportionation of the disilylphosphines. The nmr data of the compounds are reported.
    Notes: 1. Silylphosphine mit der PH2-Gruppe {(CH3)3SiPH2 (CH3)2 HSi—PH2, CH3H2Si—PH2, H3Si—PH2} bilden mit LiP(C2H5)2 (Molverhältnis 1:2) in Diglym bei niedriger Temperatur dimetallierte Silylphosphine; z. B. H3Si—PLi2 nach Diese reagieren mit CH3Cl nach 2. Die Verbindungen H3-x(CH3)xSi—PHLi werden präparativ durch Umsetzung der PH2-haltigen Silylphosphine mit LiPHCH3 nach Gl. (3) erhalten, da LiPHCH3 nie zu den dimetallierten Derivaten reagiert (geringe Basenstärke). 3. Die Lösungen der monometallierten Silylphosphine in Mono-, Di- oder Triglym disproportionieren beim Erwärmen auf Raumtemperatur und bei Zugabe von unpolaren Lösungsmitteln entsprechend Gl. (4) Diese Disproportionierungen führen zu Gleichgewichten.4. Beim Abdestillieren des Lösungsmittels können ätherate der metallierten Disilylphosphine wie z. B. [(CH3)3Si]2PLi · 1 Monoglym isoliert werden. Diese reagieren in Benzol mit CH3Cl zu den Disilylmethylphosphinen nach Gl. (5) Mit Halogensilanen werden Trisilylphosphine gebildet entsprechend Gl. (6) 5. Die monometallierten Monosilylphosphine reagieren mit AlCl3 in Diglym entsprechend Gl. (7); Die Lösungen von LiAl(PHSiH3)4 oder LiAl(PHSiH2CH3)4 in Diglym sind bei Raumtemperatur haltbar und reagieren mit CH3Cl oder Silylhalogeniden zu den entsprechenden PH-haltigen Verbindungen z. B. nach Gl. (8) Im Gemisch vorhandene Al—P(SiH3)2- und Al—PH2-Verbindungen aus Gl. (4) und AlCl3 geben in der zu Gl. (8) analogen Reaktion mit Halogensilanen Tri- bzw. Monosilylphosphine, in die die bereits gebildeten Disilylphosphine ebenfalls teilweise disproportionieren.Es werden die NMR-Spektren der Verbindungen angegeben.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744070303
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 77
    Electronic Resource
    Electronic Resource
    Reaktionen zur Bildung von Silylphosphinen des Typs X3-(n+m)(CH3)nHmSi—PH2 (X = F, Cl, Br)Vorbericht: Z. anorg. allg. Chem. 405, 337 (1974). (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 407 (1974), S. 295-304 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of Silylphosphines of the X3-(n+m)(CH3)nHmSi—PH2 Type (X = F, Cl, Br)Reactions of halosilanes with silylphosphines containing PH2-groups are reported. CH3SiHCl—PH2 is obtained by (1) For the synthesis of Cl3Si—PH2 reactions of SiCl4 with CH3SiH(PH2)2, CH3SiH2—PH2 and (CH3)3Si—PH2 are carried out in a manner analogous to that shown in eq. (2) Side reactions are observed. Cl3Si—PH2 is isolated in mixture with SiCl4 and CH3SiHCl—PH2 when the most reactive of the above compounds, CH3SiH(PH2)2 is utilized.
    Notes: Es wird über Reaktionen zwischen Halogensilanen und PH2-haltigen Silylphosphinen berichtet. CH3SiHCl—PH2 wird nach Gl. (1) zugänglich. Zur Bildung von Cl3Si—PH2 wurden Umsetzungen von SiCl4 mit CH3SiH(PH2)2, CH3SiH2—PH2 und (CH3)3Si—PH2 durchgeführt, wobei Reaktionen entsprechend Gl. (2) eintreten. Es treten Nebenreaktionen auf. Beim reaktionsfähigeren CH3SiH(PH2)2 ist die Isolierung von Cl3Si—PH2 im Gemisch mit SiCl4 und CH3SiHCl—PH2 möglich. Unter den Reaktionsbedingungen (50°C) zerfällt Cl3Si—PH2 in PH3 und Si—P-Polymere. SiBr4 reagiert bereits bei Raumtemperatur. Durch Umsetzung mit CH3SiH(PH2)2 werden je nach Reaktionsdauer CH3SiHBr—PH2, Br3Si—PH2 und auch Br2Si(PH2)2 zugänglich. Auch die Reaktion mit CH3SiH2—PH2 führt zum Br3Si—PH2 neben CH3SiH2Br. Mit FSiBr3 bildet CH3SiH(PH2)2 das FSiBr2—PH2 neben CH3SiHBr—PH2, während bei den F-reicheren Derivaten F2SiBr2 und F3SiBr die Disproportionierung in SiF4 gegenüber der Si—P-Spaltung überwiegt. Es werden die NMR-Daten der Verbindungen angegeben.Cl3Si—PH2 decomposes into PH3 and Si—P-polymers under the reaction conditions (50°C). SiBr4 however will react at room temperature. Depending on the time of reaction CH3SiHBr—PH2, Br3Si—PH2 and even Br2Si(PH2)2 are obtained with CH3SiH(PH2)2. Also the reaction with CH3SiH2—PH2 leads to the formation of Br3Si—PH2 in addition to CH3SiH2Br. With FSiBr3, CH3SiH(PH2)2 forms FSiBr2—PH2 together with CH3SiHBr—PH2. In the reaction of the higher fluorinated derivatives F2SiBr2 and F3SiBr the disproportion into SiF4 is found to be preferred to Si—P cleavage and therefore these reactions can not be adequately used. The nmr data are reported.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744070305
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 78
    Electronic Resource
    Electronic Resource
    Neue Oxocobaltate (IV): Cs2[CoO3], Rb2[CoO3] und K2[CoO3] (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 75-82 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Oxocobaltates(IV): Cs2[CoO3] Rb2[CoO3] and K2[CoO3]The hithertoo unknown compounds K2CoO3, Rb2CoO3 and Cs2CoO3 (all black) crystallize according to single crystal investigations orthorhombic (D2h18—Cmca; K2CoO3: a = 5.749, b = 11.303, c = 12.632 Å; Rb2CoO3: a = 5.871, b = 11.816, c = 13.193 Å; Cs2CoO3: a = 6.011, b = 12.519, c = 13.763 Å). From the determination of crystal structure of Cs2CoO3 results, that similar to Rb2TiO3 there are∞1[CoO3] chains with Co4+ tetrahedrally coordinated by oxygen.
    Notes: Neu dargestellt wurden K2CoO3, Rb2CoO3 und Cs2CoO3 (alle schwarz); diese kristallisieren nach Einkristalldaten orthorhombisch (D2h18—Cmca; K2CoO3: a = 5,749, b = 11,303, c = 12,632 Å; Rb2CoO3: a = 5,871, b = 11,816, c = 13,193 Å; Cs2CoO3: a = 6,011, b = 12,519, c = 13,763 Å). Die Strukturbestimmung an Cs2CoO3 zeigt, daß, wie bei Rb2TiO3, ∞1[CoO3]-Zweiereinfachketten vorliegen, Co4+ also tetraedrisch von Sauerstoff koordiniert ist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744080111
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 79
    Electronic Resource
    Electronic Resource
    Über Glasbildung und Eigenschaften von Chalkogenidsystemen. IV. Bleithiogermanat (II, IV)-Gläser und ihre Eigenschaften (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 61-71 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Glass-Forming and Properties of Chalkogenide Systems. IV. Leadthiogermanate(II, IV) Glasses and their PropertiesPbS forms with GeS2 in the presence of GeS stable glasses in a large range of composition. Melts containing an excess of sulphur yield inhomogenious products. Substituting PbS for GeS, the values of the atomic volume of the glasses at first decrease. The glass transition points as well as the optical and electrical properties are noticed and the crystalline phases received on annealing are discussed with respect to the glass-forming region. The results give the fundamentals to consider the vitreous materials of the system PbS—GeS—GeS2 as leadthiogermanate(II, IV) glasses.
    Notes: PbS bildet mit GeS2 in Anwesenheit von GeS innerhalb weiter Grenzen stabile Gläser. Schmelzen mit überschüssigem Schwefel führen zu inhomogenen Produkten. Die schrittweise Substitution des GeS-Gehalts in den Gläsern durch PbS ist zunächst mit einer Abnahme des mittleren Atomvolumens verbunden. Die Transformationstemperaturen sowie die optischen und elektrischen Eigenschaften werden mitgeteilt und die bei der Rekristallisation entstehenden Phasen dem Glasbildungsbereich zugeordnet. Die Ergebnisse rechtfertigen, die im System PbS—GeS—GeS2 erhaltenen glasartigen Substanzen als Bleithiogermanat(II, IV)-Gläser zu betrachten.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 80
    Electronic Resource
    Electronic Resource
    Über Chalkogenolate. LXIV. Untersuchungen über Thiomeisensäuren 7. Kristallstruktur von Tetraäthylammoniumcyandithioformiat (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 81-86 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Chalkogenolates. LXIV. Studies on Thioformic Acids. 7. Crystal Structure of Tetraethylammonium CyanidithioformateTetraethylammonium cyandithioformate [(C2H5)4N][NCCS2] crystallizes in the orthorhombic space group Pbem—D2h11 (no. 57): a = 7.715; b = 13.945; c = 12.255 Å and Z = 4.Planar cyandithioformate ions are packed parallel the xy plane at z = 0.25 and 0.75. The nitrogen atoms of the ammonium groups build columns along the glide plane c. Structural refinements were completed to a weighted R = 0.078.
    Notes: Tetraäthylammoniumcyandithioformiat [(C2H5)4N][NCCS2] kristallisiert rhombisch in der Raumgruppe Pbcm - D2h11 (Nr. 57): a = 7,715; b = 13,945; c = 12,255 Å und Z = 4.Die planaren Cyandithioformiationen sind parallel zur xy-Ebene in der Höhe z = 0,25 und 0,75 symmetrisch zur Gleitspiegelebene c angeordnet. Die Stickstoffatome der Ammoniumgruppen liegen auf der Gleitspiegelebene c in der Höhe z = 0 und 0,5, so daß eine säulenförmige Anordnung der Ammoniumionen parallel zur c-Achse resultiert. Die Struktur wurde bis auf einen R-Wert von 0,078 verfeinert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030110
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 81
    Electronic Resource
    Electronic Resource
    Beeinflussung der katalytischen Eigenschaften von Al2O3—SiO2-Katalysatoren durch Alkalivergiftung (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 72-80 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Effect of Alkali Contamination on the Catalytic Properties of Al2O3—Si2Catalytic properties of amorphous Al2O3—SiO2 catalysts containing different amounts of Al2O3 in dehydration of isopropanol and cracking of cumene were examined after a defined contamination of the acid centers by sodium ethylate from alcoholic solution. In both reactions, the catalytic activity is decreased by treatment with sodium ethylate, the cracking of cumene being suppressed at a lower alkali concentration than the dehydration of isopropanol. In dehydration of isopropanol, the dependence of the catalytic activity on the alkali content is influenced strongly by the Al2O3 content of the catalysts. In the cracking of cumene, strongly acid Brönsted centers are active, whereas the dehydration of isopropanol proceeds by joint action of acid Lewis or Brönsted centers, respectively, with basic centers at the surface of the catalyst (hydroxide groups or oxygen anions).
    Notes: An amorphen Al2O3—SiO2-Katalysatoren unterschiedlichen Al2O3-Gehaltes wurden nach definierter Vergiftung der sauren Zentren mit Natriumäthylat aus alkoholischer Lösung die katalytischen Eigenschaften bei der Isopropanoldehydratisierung und bei der Cumolspaltung untersucht. Die Natriumbehandlung vermindert für beide Reaktionen die katalytische Aktivität, wobei die Cumolspaltung bereits bei niedrigeren Alkalikonzentrationen unterdrückt wird als die Isopropanoldehydratisierung. Der Charakter der Abhängigkeit der katalytischen Aktivität bei der Isopropanoldehydratisierung vom Alkaligehalt wird stark vom Al2O3-Gehalt der Katalysatoren beeinflußt. Für die Cumolspaltung sind stark saure BRÖNSTED-Zentren aktiv, während die Isopropanoldehydratisierung unter gemeinsamer Beteiligung von sauren Lewis- bzw. BrÖnsted-Zentren mit basischen Zentren der Katalysatoroberfläche (Hydroxidgruppen oder Sauerstoffionen) abläuft.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030109
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 82
    Electronic Resource
    Electronic Resource
    EMK-Messungen in binären unsymmetrischen Salzschmelzen aus Strontiumchlorid und Alkalimetallchloriden (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 97-106 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The EMF of cells with transference of the type Cl2, C/MeCl ⋮ SrCl2—MeCl(x)/C, Cl2 is measured in the molten mixtures SrCl2—MeCl (Me = Li, Na, K, Rb, Cs).From the EMF-values and values of aktivities from another independent methods the transference numbers of the cations Sr2+ and Me+ relative to the chloride ion in the molten mixtures SrCl2—LiCl, SrCl2—NaCl and SrCl2—KCl are calculated. The values of aktivities for the systems SrCl2—LiCl and SrCl2—NaCl are calculated from cryoscopic analysis of the eutectic phase diagrams.
    Notes: In Mischungen SrCl2—MeCl (Me = Li, Na, K, Rb, Cs) wurden die EMK von Zellen mit Überführung vom Typ Cl2, C/MeCl ⋮ SrCl2—MeCl (x)/C, Cl2 bestimmt. Die Zellen-EMK und die aus unabhängigen Methoden ermittelten Aktivitätsdaten ermöglichen, die Überführungszahlen der Kationen Sr2+ und Me+ in den geschmolzenen Mischungen SrCl2—LiCl; SrCl2—NaCl und SrCl2—KCl in bezug auf das Chloridion zu berechnen.Für die Systeme SrCl2—LiCl und SrCl2—NaCl werden die Aktivitätsdaten aus den Schmelzdiagrammen ermittelt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030202
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 83
    Electronic Resource
    Electronic Resource
    Uber Hexafluorotitanate (III). Cs2MTiF6 und Rb2MTiF6 (M = K bzw. Na); mit einer Bemerkung über Tl3TiF6 (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 127-136 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Hexafluorotitantes (III). Cs2MTIF4 and Rb2MTIF4(M=K, Na); with a Remark on TI3TIF6By heating the binary fluorides in a closed system we obtained Cs2KTiF6 (a = 9.124 Å), Rb2KTiF6 (a = 8.932 Å) and Rb2NaTiF6 (a = 8.533 Å), all cubic Elpasolithes of light blue colour as well as Cs2NaTiF6 (hexagonal a = 6.272, c = 30.91 Å, isotypic with Cs2NaCrF6) and Tl3TiF6TiF3 (3.1-295.5°K) and Cs2KTiF6 (74.9-297.7°K) have been measured magnetically. The spectra of reflection in the range of 10 000 to 30 000 cm-1 of TiF3 and the new quaternary fluorides are similar. The Madelung Part of Lattice Energy (MAPLE) is calculated and discussed.
    Notes: Durch Erhitzen der binären Fluoride im geschlossenen System erhielten wir Cs2KTiF6 (a = 9,124 Å), Rb2KTiF6 (a = 8,932 Å) und Rb2NaTiF6 (a = 8,533 Å), alles kubische, hellblaue Elpasolithe, sowie hexagonales Cs2NaTiF6 (a = 6,272, c = 30,91 Å, isotyp mit Cs2NaCrF6) und kubisches Tl3TiF6.TiF3 (3,1 bis 295,5°K) und Cs2KTiF6 (74,9 bis 297,7°K) wurden magnetisch vermessen. Die Reflexionsspektren im Bereich 10 000 to 300 000 cm-1 von TiF3 und den neuen quaternären Fluoriden entsprechen einander weitgehend. Der Madelunganteil der Gitterenergie, MAPLE, wird berechnet und diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030205
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 84
    Electronic Resource
    Electronic Resource
    Untersuchungen an Selen-Verbindungen. LXVIII. Die Ultrarotspektren des Seleninyl-N, N′-äthylendiamids und des Seleninyl-bis-(methylamids) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 137-142 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Selenium Compounds. LXVIII. Infrared Spectra of (CH2NH2)SeO and (CH3NH)2SeOThe infrared spectra of the compounds (CH2NH)2SeO and (CH3NH)2SeO are presented and assigned by comparison with analogous compounds. The bond relations in both amides are discussed. Strong intermolecular hydrogen-bonds are formed between the Se =O and NH bond.
    Notes: Die Infrarotspektren der Verbindungen (CH2NH)2SeO und (CH3NH)2SeO werden mitgeteilt und über den Vergleich mit analogen Verbindungen zugeordnet. An Hand der IR-Spektren werden die Bindungsverhältnisse beider Verbindungen diskutiert. Die SeO-Bindung bildet mit der NH-Bindung starke intermolekulare Wasserstoffbrückenbindungen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030206
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 85
    Electronic Resource
    Electronic Resource
    Über Perowskitphasen in den Systemen AO-SE2O3-UO2,x mit A = Erdalkali und SE = Seltene Erden, La sowie Y. VI. IR-spektroskopische Untersuchungen an den Verbindungen Ba2SE0,67UO6 und Ba2SE0,67UO5,5 (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 149-155 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Perovskite Phases in the Systems AO—SE2O3—UO2,x with A=Alkaline Earth Metal and SE = Rare Earths, La and Y. VI. I.R. spectroscopical Investigations at the Compounds Ba2SE0,67UO6 and Ba2SE0,67UO5,5According to the results of the i.r. spectroscopic investigations longer and shorter U—O-distances can be distinguished. The HT- and LT-modifications of Ba2SE0,67UO6 contain UO22+-groups like other ternary uranium oxides. In the O-modifications these groups are only incompletely formed. On the contrary the perovskites Ba2SE0,67UO5,5 with U(V) show two different longer U—O-bonds only.
    Notes: Die IR-spektroskopischen Untersuchungen erlauben, zwischen längeren und kürzeren U—O-Abständen zu unterscheiden. Die HT- und TT-Modifikationen von Ba2SE0,67UO6 enthalten UO22+-Gruppen wie andere ternäre Uranoxide. In den O-Modifikationen sind diese Gruppierungen nur unvollständig ausgebildet. Die U(V)-haltigen Perowskite Ba2SE0,67UO5,5 weisen dagegen nur zwei verschiedene längere U—O-Abstände auf.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030208
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 86
    Electronic Resource
    Electronic Resource
    Das erste Oxoferrat(III) mit diskretem Anion: K6[Fe2O6] (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 151-166 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The First Oxoferrate(III) with a Discrete Anion: K6[Fe2O6]Heating of intimate mixtures of KO0.56 and “FeO” (K:Fe = 2.2:1) in a closed iron-tube at 600°C leads to red monoclinic single crystals with a = 7.133 b = 11.155 c = 6.510 Å β = 102.0° shown to have the composition K6[Fe2O6] (R = R′ = 5.5%) by three dimensional structural analysis employing direct methods [706 hk0—hk8 diffractometer data, Mo—Kα]. Space group C2/m—C2h3 (parameters see text). Surprisingly the compound is the first oxoferrate(III) with a discrete anion. This nearly has the shape of two tetrahedras sharing a common edge. The Madelung Part of Lattice Energy (MAPLE) is calculated and discussed.
    Notes: Durch Erhitzen inniger Gemenge von KO0,56 und „FeO“ (K:Fe = 2,2:1) im geschlossenen Eisen-Bömbchen bei 600°C erhielten wir rote monokline Einkristalle, a = 7,132 b = 11,155 c = 6,510 Å β = 102,0°, denen nach der dreidimensionalen Strukturaufklärung mittels direkter Methoden [706 hk0—hk8 Diffraktometer-Daten (Mo—Kα)] die Zusammensetzung K6[Fe2O6] [R = R′ = 5,5%] zukommt. Die Raumgruppe ist C2/m-C2h3; Parameter siehe Text.überraschend liegt hier das erste Oxoferrat(III) mit isoliertem Anion vor. Dieses hat annähernd die Gestalt zweier durch eine gemeinsame Kante verknüpfter Tetraeder. Der Madelung-Anteil der Gitterenergie (MAPLE) wird berechnet und diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744080209
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 87
    Electronic Resource
    Electronic Resource
    Zur Koordinationschemie des Rhenium(VII). V. Trioxo-trichlororhenate(VII) mit stickstoffhaltigen Kationen (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 180-186 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Coordination Chemistry of Rhenium(VII). V. Trioxotrichlororhenates(VII) with Nitrogen-containing CationsComplex compounds of the composition A2ReO3C3 were obtained by reaction of ReO3Cl with the chlorides ACl (A = (CH3)4N+, (C2H5)4N+, PyH+, ChinH+ (CH3)3NH+ and CH3Py+) in inert solvents. It has been decuced from the Re—O stretching vibrations of the IR spectra, that the anion ReO3Cl32- in connection with the cations (CH3)4N+ resp. (C2H5)4N+ has the symmetry C3v (cis-configuration). It is probable, that in cations including a NH-group a decrease of the symmetry towards Cs arises by means of the hydrogen bondings.
    Notes: Durch Umsetzung von ReO3Cl mit den Chloriden ACl (A —(CH3)4N+, (C2H5)4N+, PyH+, ChinH+, (CH3)3NH+ und CH3Py+) in inerten Lösungsmitteln werden Komplexe der Zusammensetzung A2ReO3Cl3 erhalten. Aus den Re—O-Valenzschwingungen der IR-Spektren ergibt sich, daß das ReO3Cl32--Anion in seinen Salzen mit (CH3)4N+ und (C2H5)4N+ C3v-Symmetrie (cis-Konfiguration) aufweist. Bei Kationen, die eine NH-Gruppe enthalten, tritt wahrscheinlich infolge von Wasserstoffbrückenbindungen Symmetrieerniedrigung nach Cs ein.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744080212
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 88
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von Rubidiumtrijodoplumbat(II) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 209-213 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Rubidium Triiodoplumbate(II)RbPbJ3 crystallizes in the orthorhombic space group Pnam(D2h16) (lattice parameters see above); it is isomorphous with CsPbJ3. The crystal structure has been determined from 1452 independent reflexes by Patterson- and Fourier-syntheses and refined three dimensionally by least-squares-methods.6 I surround Pb nearly octahedrally. The octahedra are arranged in the form of double chains along the c-axis, which are held together by Rb. (Pb—I bond distances see above). The “inert 6s-pair” at Pb is stereochemically inactive.
    Notes: RbPbJ3 kristallisiert orthorhombisch in der Raumgruppe Pnam (D2h16) mit a = 10,274(1), b = 17,381(2), c = 4,773(1) Å und Z = 4; es ist isomorph mit CsPbJ3. Die Kristallstruktur wurde anhand von 1452 unabhängigen Reflexen mittels Patterson- und Fourier-Synthesen bestimmt und nach der Kleinste-Quadrate-Methode dreidimensional verfeinert.Pb ist nahezu oktaedrisch von 6 J umgeben. Die Oktaeder bilden längs der c-Achse Doppelketten, die von Rb zusammengehalten werden. Die Pb-J-Bindungsabstände betragen 3,037(2), 3,382(2), 3,224(1), 3,253(1) Å. Das „inerte 6s-Elektronenpaar“ des Pb tritt sterisch nicht in Erscheinung.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744080215
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 89
    Electronic Resource
    Electronic Resource
    Masthead (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974) 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744080301
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 90
    Electronic Resource
    Electronic Resource
    High- und Low-Spin-Verhalten des Ni3+ -Ions in oktaedrischer Koordination. (A) NiF63--Polyeder (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 187-204 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: High and Low Spin Behaviour of Ni3+-Ions in Octahedral CoordinationThe compounds Cs2NaNiF6, Cs2KNiF6, Rb2KNiF6, K3NiF6, and Na3NiF6 were investigated by ligand field and EPR spectroscopy between 298 and 4,2 K. These fluorides — with the exception of the first one - crystallise in the cubic elpasolite lattice or in distorted modifications of this structure type and contain the Ni3+ ions in the low spin configuration t2g6eg1. This configuration is stabilised versus the high spin alternative t2g5eg2 by an appreciable Jahn-Teller splitting of the 2Eg-state of about 7000 cm-1. The NiF6-octahedra are tetragonally elongated, the distortion being dynamical at 298 K. In case of the cubic compound Rb2KNiF6 a transition to a tetragonal structure with c/a 〉 1 as a consequence of a ferrodistortive Jahn-Teller ordering is observed at lower temperatures. It is calculated from the anisotropic g-parameters, that the first excited quartet level 4A2g(4T1g — t2g5eg2) has an energy which is about 1000 cm-1 higher than that of the 2A1g(2Eg — t2g6eg1) groundstate. Spin-orbit interactions between the energetically neighboured 2A1g(2Eg) and 4A2g, 4Eg(4T1g) states lead to third order contributions to the g-factors, which are very sensitive with respect to the doublet-quartet separation. In the hexagonal compound Cs2NaNiF6 finally, in which half of the Ni3+ ions occupy octahedral sites connected by common corners as in the other fluorides, while the other half is located in octahedral sites with common faces, high and low spin Ni3+ ions are found side by side. Obviously the latter half of these Ni3+ ions is geometrically restricted with respect to a Jahn-Teller distortion and hence the high spin configuration energetically favoured.
    Notes: Die Ni3+-Ionen enthaltenden Verbindungen Cs2NaNiF6, Cs2KNiF6 Rb2KNiF6, K3NiF6 und Na3NiF6 wurden ESR- und ligandenfeldspektroskopisch im Temparaturbereich zwischen 298° und 4,2°K untersucht. Die vier letztgenannten Fluoride, die im kubischen Elpasolithgitter oder verzerrten Varianten dieser Struktur kristallisieren, enthalten die Ni3+-Ionen im Low-Spin-Zustand. Er wird durch die Jahn-Teller-Instabilität der Konfiguration t2g6eg1, die zu einer tetragonalen Weitung der NiF6-Oktaeder und zu einer Aufspaltung des 2Eg-Zustandes von ca. 7000 cm-1 führt, stabilisiert. In übereinstimmung damit verzerrt sich das bei Raumtemperatur kubische Rb2KNiF6 beim Abkühlen tetragonal mit c/a 〉 1. Aus den gemessenen anisotropen g-Faktoren errechnet sich, daß der erste angeregte Quartett-Term 4A2g(4T1g — t2g5eg2) etwa 1000 cm-1 über dem 2A1g(2Eg — t2g6eg1)-Grundzustand liegt. Die LS-Kopplung hat zu Wechselwirkungen zwischen den eng benachbarten 2A1g(2Eg)- und 4A2g, 4Eg(4T1g)-Termen geführt, die numerisch erhebliche Beiträge zu den g-Parametern liefern und die energetische Dublett-Quartett-Separation sehr empfindlich widerspiegeln. Im hexagonalen Cs2NaNiF6 schließlich, in dem die dreiwertigen Kationen je zur Hälfte über gemeinsame Ecken verbundene und flächenverknüpfte Oktaeder besetzen, wurden nebeneinander Ni3+-Ionen im Low-Spin- und im High-Spin-Zustand gefunden. Es konnte wahrscheinlich gemacht werden, daß für die durch Flächenverknüpfung in ihren geometrischen Möglichkeiten zu einer Verzerrung eingeschränkten NiF6-Polyeder die elektronische Jahn-Teller-Aufspaltung zur Stabilisierung des Low-Spin-Zustandes nicht mehr ausreicht.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744080213
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 91
    Electronic Resource
    Electronic Resource
    IR-Spektren und Kraftfelder ternärer Alkali-Yttriumfluoride mit Elpasolitstruktur (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 255-260 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: IR Spectra and Forcefields of Ternary Alkali-Yttrium Fluorides with Elpasolite StructureIR spectra of A2BYF6 are reported and five force constants are calculated using a modified valence force field. The results are discussed with respect to the two bond characters.
    Notes: Es werden die IR-Spektren von A2BYF6 (A = K, Rb, Cs; B = Na, K, Rb, Cs) mitgeteilt und daraus mittels eines modifizierten Valenzkraftfeldes fünf Kraftkonstanten berechnet. Die Ergebnisse werden für die beiden Bindungsarten diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744080305
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 92
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Phosphors. 53. 1,2,3,4-Tetraphenyl-cyclo-5-thia-1,2,3,4-tetraphosphanProfessor Margot Becke-Goehring zum 60. Geburtstage gewidmet (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 225-236 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Phosphorus. 53. 1,2,3,4-Tetraphenylcyclo-5-thia-1,2,3,4-tetraphosphane1,2,3,4-Tetraphenyl-cyclo-5-thia-1,2,3,4-tetraphosphane (“tetraphenylcyclotetraphosphine-monosulphide„) 1 is obtained in very good yield and purity by the reaction of pentaphenyl-cyclopentaphosphane (2) with sulphur (4 C6H5P: 1 S). Further new methods of preparation are the comproportionation of 2 with (C6H5PS)3, and the reaction of dipotassium-triphenyl-cyclotriphosphide (4) with sulphur dichloride. The IR and 31P-NMR spectra of the title compound indicate unambiguously the heterocyclophosphane structure 1 with a five-membered P4S ring. The elevated stability of this ring system is evident from numerous other formation reactions, which are reported in addition.
    Notes: 1,2,3,4-Tetraphenyl-cyclo-5-thia-1,2,3,4-tetraphoshan (“Tetraphenyl-cyclotetraphosphin-monosulfid”) 1 wird durch Umsetzung von Pentaphenyl-cyclopentaphosphan (2) mit Schwefel (4 C6H5P:1 S) in sehr guter Ausbeute und Reinheit erhalten. Weitere neue Darstellungswege sind die Komproportionierung von 2 und (C6H5PS)3 sowie die Reaktion von Dikalium-triphenyl-cyclotriphosphid (4) mit Schwefeldichlorid. Das IR- und das 31P-NMR-Spektrum der Verbindung sind ein eindeutiges Indiz für die Heterocyclophosphan-Struktur 1 mit fünfgliedrigem P4S-Ring. Die besondere Stabilität dieses Molekelgerüstes geht aus der größeren Zahl weiterer Bildungs-Reaktionen für 1 hervor, über die außerdem berichtet wird.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744080302
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 93
    Electronic Resource
    Electronic Resource
    Masthead (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974) 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030101
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 94
    Electronic Resource
    Electronic Resource
    Zur Kenntnis gemischter Dicyanamido- (Thio)Cyanato-Kobaltate (II) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 35-40 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mixed Dicyanamido (thio) cyanato-cobaltates(II)Preparation and properties of mixed anionic pseudohalide-complexes of cobalt(II) [CoX2Y2]2- and [CoX3Y]2- (X = NCS, NCO, Y = N(CN)2) are reported. The structures of the complexes are discussed using the results of infrared and electronic spectroscopy and of magnetic measurements.
    Notes: Es wird über Darstellung und Eigenschaften gemischter Pseudohalogeno-kobaltate(II) [CoX2Y2]2- und [CoX3Y]2- (X = NCO, NCS; Y = N(CN)2) berichtet. Die Struktur der Komplexe wird unter Heranziehung von Elektronen- und Infrarotspektren sowie von magnetischen Messungen diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030104
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 95
    Electronic Resource
    Electronic Resource
    Ein Beitrag zur Strukturchemie der Selten-Erd-TrifluorideProfessor Georg Brauer zum 65. Geburtstage gewidmet (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 1-22 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Some Aspects of the Structural Chemistry of the Rare Earth TrifluoridesThe preparation and characterization of the rare earth trifluorides crystallizing in the hexagonal LaF3-type and the orthorhombic YF3-type is described. The lattice parameters were derived from GUINIER powder data of high precision. These lattice parameters served to calculate the effective ionic radii of the tripositive rare earth ions for coordination numbers 8 and 9. It is shown that both structure types can be stabiblized by the formation of nonstoichiometric compounds of the general formula (Me, RE)Fx (Me ≙ Eu2+, Sr2+ and RE ≙ Eu3+, Gd3+) with x varying approximately from 2,77 to 2,94 for the hexagonal and from 2,94 to 3,00 for the orthorhombic nonstoichiometric phases. For the pure trifluorides and the nonstoichiometric phases a critical radius ratio of 0.830±0.008 was found for the changeover from the LaF3- to the YF3-structure.
    Notes: Es wird die Präparation und Charakterisierung der im LaF3- und YF3-Typ kristallisierenden Selten-Erd-Trifluoride beschrieben. Die Gitterparameter wurden nach der GUINIER-Methode mit hoher Präzision bestimmt und daraus für SE3+- Ionen mit der Koordinationszahl 8 und 9 effektive Ionenradien abgeleitet. Es wird gezeigt, daß sich beide Strukturtypen in nichtstöchiometrischen Verbindungen der allgemeinen Formel (Me, SE)Fx (Me ≙ Eu2+, Sr2+ und SE ≙ Eu3+, Gd3+) stabilisieren lassen mit Phasenbereichen von x = 2,77 bis x = 2,94 für die hexagonalen und von x = 2,94 bis x = 3,00 für die orthorhombischen festen Lösungen. Für die stöchiometrischen und nichtstöchiometrischen Fluoride wurde der Grenzradienquotient zwischen LaF3- und YF3-Struktur zu 0,830 ± 0,008 ermittelt.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030102
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 96
    Electronic Resource
    Electronic Resource
    Anionische Nickel-Pseudohalogenid-Komplexe der Typen [Ni{N(CN)2}3]- und [Ni{N(CN)2}2(NCS)2]2- (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 41-44 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Anionie Nickel Pseudohalide Complexes of the Types [Ni{N(CN)2}3]- and [Ni{N(CN)2}2(NCS)2]2-The preparation of a new type of anionic pseudohalide complexes of nickel [Ni{N(CN)2}3]- and of mixed thiocyanate-dicyanamide complexes [Ni{N(CN)2}2(NCS)2]2- is reported. The structures of the complexes are discussed on the basis of IR- and magnetic measurements. The new compounds are representing polymer octahedral complexes with a bridging function of the dicyanamide ligands.
    Notes: Es wird über die Darstellung eines neuen Typs anionischer Nickelpseudohalogenid-Komplexe [Ni{N(CN)2}3]- sowie gemischter Thiocyanat-Dicyanamid-Komplexe [Ni{N(CN)2}2(NCS)2]2- berichtet. Die Struktur der Komplexe wird auf der Grundlage von IR-spektroskopischen Untersuchungen sowie von magnetischen Messungen diskutiert. Die Verbindungen repräsentieren polymer oktaedrische, durch Dicyanamid-Gruppen verbrückte Komplexe.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 97
    Electronic Resource
    Electronic Resource
    Kristallchemische Studien an Seltenerd-Dihalogeniden. Die Kristallstruktur von Ytterbium(II)-chlorid, YbCl2Professor Georg Brauer zum 65. Geburtstage gewidmet (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 45-55 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystallorgraphic Studies on Rare-Earth Dihalides. The Crystal Structure of Ytterbium (II) -chloride, YbCl2Using 452 reflexions collected on an automatic two-circle diffractometer with MoKα radiation the structure of YbCl2 was refined to a residual R = 0.025. The structural parameters of YbCl2 are in good agreement with those of SrI2. This is to be expected if the radius ratio is accepted as the main structural principle. The geometrical details of the coordination polyhedra around the sevenfold coordinated Yb2+ ion and the three- and fourfold coordinated Cl- ions are discussed in short. It is shown that the calculated vibrational parameters are physically relevant.
    Notes: Für Ytterbium(II)-chlorid wurde mit Hilfe von 452 Einkristallinterferenzen, die auf einem automatischen Zweikreisdiffraktometer mit MoKα-Strahlung gemessen wurden, eine Strukturverfeinerung bis zu einem Zuverlässigkeitsindex R = 0,025 durchgeführt. Die strukturellen Parameter von YbCl2 stimmen weitgehend mit denjenigen von SrJ2 überein. Dieser Befund ist plausibel, wenn man den Ionenradienquotienten als Strukturargument gelten läßt. In einer kurzen Diskussion werden kristallchemische Details der Koordinationspolyeder des siebenfach koordinierten Yb2+-Ions und der drei- bzw. vierfach koordinierten Cl--Ionen besprochen. Ferner wird gezeigt, daß die eingeführten anisotropen Temperaturfaktoren physikalisch relevant sind.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030106
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 98
    Electronic Resource
    Electronic Resource
    Mitteilung der Abteilung für Anorganische Chemie der IUPAC (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 95-96 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030112
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 99
    Electronic Resource
    Electronic Resource
    Masthead (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974) 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030201
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 100
    Electronic Resource
    Electronic Resource
    Trisdithiocarbamates mass spectra mass spectra. Study of arsenic, antimony and bismuth Trisdithiocarbamate Complexes (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 87-94 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Massenspektren von Trisdithiocarbamaten. Massenspektroskopische Untersuchung von Trisdithiocarbamat-Komplexen des Arsens, Antomons und WismutsZehn Trisdithiocarbamat-Verbindungen von Arsen, Antimon und Wismut wurden massenspektrometrisch untersucht. Ihre Fragmentationsweise und die Fragment-Ionen mit gleichen Strukturen werden diskutiert. Die Peaks der Molekül-Ionen wurden von allen Verbindungen nicht beobachtet. Die Fragment-Ionen mit der größten Massen-Zahl, die direkt aus den Molekül-Ionen hervorgehen, sind diejenigen mit einer um eine Dithiocarbamat-Gruppe kleineren Masseneinheit, was eine leichte Abspaltung einer Dithiocarbamat-Gruppe andeutet. Die beobachteten Peaks sind auf Elektronenstoß oder auf pyrolytische Zersetzung zurückzuführen. Die stärksten Peaks im oberen Massenzahl-Bereich aller Spektren entsprachen Polynuklear-Verbindungen der allgemeinen Formel MnSm, wobei M = As, Sb, Bi; S = Schwefel; n = 1, 2, 3, 4 und m = 0, 1, 2, 3, 4, 5 sind.
    Notes: Ten trisdithiocarbamate compounds of arsenic, antimony and bismuth are studied by mass spectrometry. Their fragmentation modes and the fragment ions with common structures are discussed. The molecular ion peaks were not observed in all compounds. The highest mass number fragment ions, which might be generated directly from the molecular ions, are those with less mass units, equal to a dithiocarbamate group; signifing a facile detaching of one of the dithiocarbamato groups. The observed peaks are attributed, either to electron impact or to pyrolytic decomposition. The most prominent peaks, in the higher mass number region of all the spectra, correspond to polynuclear compounds of the general formula MnSm, where M = As, Sb, Bi; S = sulfur; n = 1, 2, 3, 4 and m = 0, 1, 2, 3, 4, 5.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030111
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...