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  • Artikel  (42)
  • Inorganic Chemistry  (31)
  • Ultrastructure  (11)
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  • Artikel  (42)
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  • 1
    Digitale Medien
    Digitale Medien
    Fluoreszenz und Fluoreszenz-Thermochromie bei Alkyl-pyridinokupfer(I)-Halogeniden (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 387 (1972), S. 61-71 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: By adding acetyl halide to solutions of copper(I)acetate in mixtures of acetonitrile and acetic acid, highly pure copper(I) halides can be prepared. These form with pyridine and alkylpyridines (= L) yellow or greenish yellow compounds of the formula Cu(L)3X. Colourless compounds of the formula Cu(L)X can be obtained by thermal decomposition of these compounds. All these compounds exhibit an intensive fluorescence of different colours. Some compounds of the formula Cu(L)X change at low temperatures reversibly the fluorescence colour. It is proposed, to use for this phenomenon the term ‘Fluorescence Thermochromism’.
    Notizen: Durch Zugabe von Acetylhalogenid zu Lösungen von Kupfer(I)-acetat in Acetonitril/Essigsäuregemischen sind reinste Kupfer(I)-Halogenide darstellbar. Diese bilden mit Pyridin und Alkylpyridinen (= L) gelbe bis grüngelbe Verbindungen der Zusammensetzung Cu(L)3X. Durch thermische Zersetzung können daraus farblose Verbindungen der Zusammensetzung Cu(L)X dargestellt werden. Alle diese Verbindungen zeigen eine intensive Fluoreszenz der verschiedensten Farben. Einige Verbindungen der Zusammensetzung Cu(L)X ändern bei tiefer Temperatur reversibel ihre Fluoreszenzfarbe. Für diese Erscheinung wird der Begriff ‘Fluoreszenz-Thermochromie’ vorgeschlagen.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19723870108
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Crystalline bodies in parathyroid gland cells ofRana temporaria L. (1972)
    Springer
    Cell & tissue research 127 (1972), S. 1-8 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Parathyroids ; Anurans ; Crystals ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Cytoplasmic and nuclear crystalline inclusions are described in parathyroid secretory cells of adult frogs (Rana temporaria L.) and their possible significance is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00582756
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    II. Ultrastructure of duct cell granules in mammalian submaxillary glands (1972)
    Springer
    Cell & tissue research 126 (1972), S. 335-347 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Glandulae submaxillares ; Mammals ; Duct cell granules ; Ultrastructure ; Histochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Discrete, PAS-positive granules of relatively uniform electron-density and size characterise the intercalated duct cells of mammalian submaxillary glands. Smaller, electron-dense organelles are seen in the cells at the junction of the intercalary-striated duct region in the guinea-pig. The large granules of variable electron-density which are observed in the proximal, modified intercalary cells in the rabbit closely resemble the granules in the acinar cells of the guinea-pig. Several populations of granules differing in size are found in the striated granular tubules of the rat and hamster; the organelles in the rat show two grades of electron-density whereas those in the hamster are uniformly dense. Numerous small granules with compactly arranged intragranular material occupy the apical part of the striated ducts of the cat, dog and rabbit. The chemical composition of each population of duct cell granules is unknown. The question whether granules containing kallikrein, trypsin-like enzymes and amylase are stored in the duct cells is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00306848
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Scanning electron microscopy of the insect compound eye (1972)
    Springer
    Cell & tissue research 126 (1972), S. 437-445 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Eye ; Sarcophaga bullata ; Ommatidia ; Lamina ganglionaris ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary External and internal surfaces of the compound eye of the flesh fly, Sarcophaga bullata, were examined with a scanning electron microscope. A low patterned corneal nippleridge array and sparse setiform interfacetal hairs were observed on the corneal lens surface. Particular cleavage planes revealed outlines of the Semper Cells, their nuclei and distal terminations of photoreceptor cells. The latter, with their axonal processes, were visualized and described. These axons were noted traversing the external chiasma and entering the lamina ganglionaris where suggestions of synaptic contact were pointed out. The present descriptions were correlated with those taken from literature of the transmission electron microscope.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00306904
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Die Struktur des Nervengewebes von Macrobiotus hufelandi C.A.S. Schultze (Tardigrada) (1972)
    Springer
    Cell & tissue research 132 (1972), S. 131-146 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Nervous tissue ; Tardigrada ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Das Nervengewebe von Macrobiotus hufelandi zeichnet sich durch stark verzweigte pseudunipolare Nervenzellen und relativ wenige Gliazellen aus. Die Neurone besitzen rauhes ER, freie Ribosomen, zahlreiche Mitochondrien, einen wenig ausgeprägten Golgi-Apparat und einen elektronenlichten Kern. In ihren Axonen finden sich Vesikel und Einschlüsse unterschiedlicher Größe und Zusammensetzung. Die Gliazellen verzweigen sich stark und besitzen glattes ER, viele freie Ribosomen und einen elektronendichten Kern. Ganglien und Nerven werden nur durch eine dünne Neurallamelle vom extraganglionären Raum getrennt. Die morphologische Ausbildung des Nervengewebes wird im Hinblick auf die extreme Lebensweise der Tardigraden diskutiert.
    Notizen: Summary The typical elements of the nervous tissue of Macrobiotus hufelandi are strongly ramified pseudunipolar neurons and a small amount of glial cells. In the perikarya of neurons there are rough ER, free ribosomes, many mitochondria, a poor Golgi-apparatus, and an electron-light nucleus. Nerve fibers contain masses of vesicles and inclusions of different size and composition. The ramifying glial cells have smooth ER, many free ribosomes, and an electron-dense nucleus. Ganglia and nerves are separated from the extraganglionic cavity by a thin acellular sheath (neural lamella). The organization of the nervous tissue is discussed with regard to the extreme conditions of environment of the tardigrades.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310301
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    The ultrastructure of the liver parenchyma of the immature fowl (Gallus domesticus) (1972)
    Springer
    Cell & tissue research 133 (1972), S. 35-46 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Ultrastructure ; Fowl ; Liver
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The ultrastructure of the liver parenchymal cell from immature pullets and from immature and young mature cockerels has been studied. The results demonstrated that the fowl's hepatocyte is structurally very similar to that of other birds and, in spite of certain morphological differences between the livers of birds and mammals, is also very similar in structure to the liver cell of mammals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00307066
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Ultimobranchial gland ultrastructure of larval axolotls, Ambystoma mexicanum shaw, with some observations on the newt, Pleurodeles waltlii Micahelles (1972)
    Springer
    Cell & tissue research 134 (1972), S. 183-192 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Ultimobranchial glands ; Urodeles ; Cell types ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The fine structure of the ultimobranchial (UB) glands of two common laboratory urodeles, viz., larval axolotls, Ambystoma mexicanum Shaw and adult Pleurodeles waltlii Micahelles, is described and compared in what is believed to be the first ultrastructural report on urodele UB glands. The axolotl UB gland shows a wide variety of form, being represented by an elongated diffuse series of follicles and sometimes by one or two large discrete terminal follicular bodies. In these axolotl UB glands up to four cell categories are distinguishable including a tonofilamentous cell and a secretory cell that is possibly homologous with calcitonin-producing C cells of anurans or other vertebrates. These two cell categories are also found in the Pleurodeles gland. The possible significance of the various cells is considered.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00307152
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Ultrastructure of the hepatopancreas and associated tissues of the chelicerate arthropod, Limulus polyphemus (1972)
    Springer
    Cell & tissue research 134 (1972), S. 255-271 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Hepatopancreas ; Limulus ; Gap junctions ; Calcium spherules ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The ultrastructure of the hepatopancreas and associated tissues of Limulus is described. All hepatopancreatic tubules contain L- and D-cells. L-cells exhibit apical pinocytosis and contain many different types of inclusions, including lipid containing calcium spherules of unique structure. They also produce a complex secretory product released by apocrine secretion. D-cells contain much rough endoplasmic reticulum, and show other evidence of active protein synthesis. They produce a single type of secretory granule released by merocrine activity. The appearance of L- and D-cells in tubules of various sizes and in fed and starved animals is described. Both cell types may produce digestive enzymes and absorb and transport nutrients to the hemolymph, but neither serves as a major storage site. Storage is an important function of the intertubular R-cells. The appearance of R-cells in fed and starved animals is described. A previously undescribed hemocyte is reported, as are apparent gap junctions between L- and R-cells. A structural and functional comparison of these glands with those of other arthropods is presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00307157
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Scanning electron microscopy of the insect compound eye (1972)
    Springer
    Cell & tissue research 126 (1972), S. 446-453 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Eye ; Manduca sexta ; Ommatidia ; Retinula ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The superposition eye of the sphingid moth, Manduca sexta was explored by means of the scanning electron microscope (SEM). Specifically examined were the corneal nipple array, corneal lens, crystalline cones and tracts, photoreceptor cells and their axons. Descriptions of the external ultrastructure of the components were correlated, where possible with previously published accounts of internal ultrastructure as obtained from TEM studies. A key finding was the demonstration of the axial rotation of the eccentrically situated retinular cell, its externally noted prominence and the arrangement of the other photoreceptor cells composing the retinula. Because of the interest in superposition eye theory, the functional significance of various preretinular optic components was reviewed where it specifically related to Manduca.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00306905
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Elektronenmikroskopische Befunde zur Innervation des Nephron nach Untersuchungen an der fetalen Nachniere des Menschen (1972)
    Springer
    Cell & tissue research 129 (1972), S. 65-75 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Fetal metanephros ; Renal nerves ; Renal tubules ; Macula densa ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung In elektronenmikroskopischen Untersuchungen an den Nachnieren 13–16 Wochen alter menschlicher Feten wird gezeigt, daß die Macula densa und andere Abschnitte des Mittelstücks der Niere von marklosen Nervenfasern innerviert werden. Nervenfasern gelangen mit den Gefäßen an die Tubuli. Synapsen finden sich innerhalb der Tubulusmembran an der Basis der Tubulusepithelien. Eine Synapse wurde an der parietalen Bowmanschen Kapsel nahe dem Gefäßpol des Glomerulus beobachtet. Die Mehrzahl der bisher am Tubulus beobachteten Axonendigungen scheint cholinergen Neuronen zuzugehören, jedoch ist eine weitere Abklärung in Verbindung mit histochemischen Methoden erforderlich. Die Bedeutung der Innervation für die Funktion des Nephron ist schwer einzuschätzen, zumal experimentelle Untersuchungen hierzu fehlen. Auch Befunde nach Nierentransplantation lassen wegen der möglichen postoperativen Persistenz und Regenerationsfähigkeit intrarenaler Nervenfasern keine eindeutigen Rückschlüsse zu. Möglicherweise ist mit dem Nachweis der Innervation auch das regulierende Agens für den „kontraktilen Apparat“ der Niere bzw. des Nephron gefunden. Interessanter weiterer Befund ist die Beobachtung synaptischer Nerv-Endothel-Kontakte in kleinsten Nierengefäßen (Endarteriolen).
    Notizen: Summary Electron microscopic study of the metanephros of 13–16-week-old human fetuses shows that the region of the macula densa as well as other segments of the distal convoluted tubule are innervated by unmyelinated nerve fibers. Nerve fibers reach the tubules alongside blood vessels. Synapses are found within the basal lamina of the tubular epithelia. One synapse was seen in the parietal part of the Bowman's capsule near the vascular pole of the glomerulus. Present evidence suggests mainly cholinergic innervation of the distal tubule, but verification using other histochemical methods is necessary. In the absence of experimental studies, it is difficult to determine the functional role of the innervation of the nephron. Observations after renal transplantation are not conclusive in view of possible postoperative persistence and regeneration of intrarenal nerve fibres. It may well be that innervation controls the “contractile apparatus” of the kidney. Synaptic contacts between axons and endothelial cells of the smallest renal arterioles may also have functional significance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00307111
    Standort Signatur Erwartet Verfügbarkeit
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