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
  • Electron microscopy  (8)
  • Neurosecretion  (5)
  • Collagen  (3)
  • Springer  (13)
  • American Physical Society (APS)
  • 1965-1969  (13)
  • 1969  (13)
Collection
Keywords
Publisher
  • Springer  (13)
  • American Physical Society (APS)
Years
  • 1965-1969  (13)
Year
  • 1
    Electronic Resource
    Electronic Resource
    The effect of some inhibitors on the nucleation and crystal growth of apatite (1969)
    Springer
    Calcified tissue international 3 (1969), S. 348-357 
    Details
    ISSN: 1432-0827
    Keywords: Inhibitors ; Nucleation ; Apatite ; Collagen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Des ions de Mg, Sr et F sont inhibitoires pour la formation de l'apatite quand on les ajoute à un tampon de calcification, séparément ou en combinaisons. La précipitation de l'apatite causée par des cristaux d'apatite est moins sensible à l'action inhibitrice que la nucléation spontanée et que la précipitation catalysée par la collagène d'os de mouton. La précipitation spontanée ou catalysée sont approximativement aussi sensibles. L'inhibition par des combinaisons de Mg avec des ions de Sr ou de F est additive. Ces résultats montrent que ces inhibiteurs ont acucune action spécifique sur la catalysation par la collagène de l'os de mouton qui soit différente de celle sur la nucléation de l'apatite en soi.
    Abstract: Zusammenfassung Mg, Sr und F Ionen hemmten die Fällung von Apatit wenn sie zu einem Calciumphosphatpuffer einzeln oder zusammen hinzugefügt wurden. Die Fällung von Apatit durch Apatitkeime war weniger empfindlich hinsichtlich der Hemmung als die spontane Nucleation und als die Fällung von Apatit, welche von Schafsknochenkollagen katalysiert werden kann. Die spontane und katalysierte Fällung sind ungefähr gleich empfindlich. Die Hemmung von Mg in Kombination mit Sr oder F Ionen war additiv. Diese Resultate weisen darauf hin, daß keine spezifischen Effekte bei der Katalyse von Knochenkollagen vorliegen, welche von den Effekten bei der Nucleation von Apatit an sich verschieden sind.
    Notes: Abstract Mg, Sr and F ions acted as inhibitors of apatite formation when added to a calcification buffer separately or in combinations. The precipitation of apatite under the influence of apatite seeds was less susceptible to inhibition than were spontaneous nucleation and apatite formation catalyzed by sheep bone collagen, while the latter two were about equally susceptible. Combinations of Mg with Sr or F ions showed additive effects. These results suggest that no specific effects of these inhibitors occurred on the catalytic action of the bone collagen different from their effects on the nucleation of apatite as such.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02058677
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Relationship between iron, calcium and phosphate during experimental cutaneous calcinosis (1969)
    Springer
    Calcified tissue international 4 (1969), S. 224-230 
    Details
    ISSN: 1432-0827
    Keywords: Calcinosis ; Calcium ; Iron ; Phosphate ; Collagen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé La calcification de la peau (calciphylaxie) provoquée par l'administration sous-cutanée de chlorure de fer chez des rats sensibilisés par le dihydrotachystérol (DHT) est précédée par une déposition sélective de fer (décelable à la microscopie électronique) à la surface des fibres collagènes. Les analyses à la microsonde prouvent que les taux de calcium et de phosphore sont augmentés à l'endroit de l'injection du chlorure de fer même sans l'administration préalable de DHT; cependant, l'apatite ne se forme que chez les animaux prétraités par le DHT. La quantité et le degré de cristallinité de la matière inorganique sont presque identiques au sixième et au trentième jour de l'expérience.
    Abstract: Zusammenfassung Durch elektronenmikroskopische Untersuchungen wurde festgestellt, daß die durch subcutane Verabreichung von Eisenchlorid bei Dihydrotachysterin-sensibilisierten Ratten herbeigeführte Hautverkalkung durch eine selektive Eisenablagerung auf der Oberfläche der Kollagenfibrillen eingeleitet wird. Die Röntgenmikroanalyse zeigt an, daß die lokale Calciumund Phosphorkonzentration bereits nach Eiseninjektion allein ansteigt, während Apatitbildung nur in den mit DHT vorbehandelten Tieren erfolgt. Ausmaß und Menge der Kristallisation sind am 6. und 30. Tage nach Versuchsbeginn fast gleich.
    Notes: Abstract Calcification of the skin (calciphylaxis) induced by the subcutaneous administration of iron chloride to dihydrotachysterol (DHT)-sensitized rats is preceded by the selective deposition of iron (visible with electron microscopic techniques) on the surface of collagen fibrils. Electron probe X-ray microanalysis indicates that the injectionof iron alone suffices to increase local concentrations of calcium and phosphorus; however, apatite formation occurs only in animals pretreated with DHT. The amount and degree of crystallinity of the inorganic material is very similar on the sixth and thirtieth day after the beginning of the experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279125
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The effect of electric current on rat tail tendon collagen in solution (1969)
    Springer
    Calcified tissue international 4 (1969), S. 330-338 
    Details
    ISSN: 1432-0827
    Keywords: Collagen ; Electric current ; Electrolysis ; Precipitation ; Bone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé L'effet du courant électrique sur la collagène soluble, en solution dans l'acide acétique dilué, a été étudié pour des voltages, variant de O à 25 volts. Au-dessus de 2,6 volts, la vormation des bandes collagéniques (définies dans ce travail) parait inversement proportionelle, dans le temps, au voltage appliqué. La formation des bandes parait liée au processus d'électrolyse. Les auteurs démontrent que les pH élevés se situent au niveau de la cathode et qu'ils sont suffisants pour induire une précipitation du collagène. Les résultats antérieurs, publiés dans la littérature, décrivant l'action de courant électrique implanté, sont interpretés en fonction du mécanisme étudié au cours de ce travail.
    Abstract: Zusammenfassung Die Wirkung eines elektrischen Stromes auf verdünnte essigsaure Lösungen von löslichem Kollagen wurde bei Spannungen zwischen O und 25 Volt untersucht. Über 2,6 Volt wurde die Bildung von Kollagenbanden (in der Arbeit näher beschrieben) beobachtet, und zwar nach Zeiten, die der angewandten Spannung entgegengesetzt proportional verliefen. Die Bandenbildung wird dem Elektrolyseprozeß zugeschrieben. Wir konnten zeigen, daß sich die hohen pH-Werte rund um die Kathode entwickelten und daß diese genügen, um die Kollagenfällung zu veranlassen. Die Natur dieses Vorganges ist solcher Art, daß erin vivo als Antwort auf durch Stress verursachte Biopotentiale nicht vorkommen kann. Der hier beschriebene Mechanismus erlaubt es, Literaturangaben über den Effekt von implantierten Spannungsquellen zu interpretieren.
    Notes: Abstract The effect of electric current on dilute acetic acid solutions of soluble collagen has been studied for impressed voltages of from 0 to 25 volts. Above 2.6 volts the formation of collagen bands (herein defined) were observed at times inversely proportional to the applied voltage. Band formation is attributed to the process of electrolysis. It has been shown that the high pH values are generated in the area of the cathode, and that they are sufficient to induce collagen to precipitate. The nature of the process is such that it cannot occurin vivo as a response to stress induced biopotentials. Reports in the literature describing the effect of implanted voltage sources are interpreted in terms of the mechanism described here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279135
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Formation of α- and β-type keratin in lizard epidermis during the molting cycle (1969)
    Springer
    Cell & tissue research 101 (1969), S. 72-87 
    Details
    ISSN: 1432-0878
    Keywords: Cell differentiation ; Keratin ; Electron microscopy ; Reptiles ; Skin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The epidermis of Anolis carolinensis is renewed periodically by molting. Prior to the molt the distinct layers of the epidermis, namely, the Oberhäutchen, β, mesos, and α layers, are formed in sequence from a morphologically homogenous population of basal cells. The Oberhäutchen, the first cell layer to form, has spinules on the surface which interdigitate with the overlying cells of the clear layer. The cells of the Oberhäutchen develop 80 Å filaments similar to those in the cells of the α layer. Beneath the Oberhäutchen is the β layer, the cells of which develop membrane-bounded packets containing a homogenous material during the early stages of differentiation. Later 100–500 Å thick fibrils are formed in the membranebounded packets. The fully keratinized cells, however, are packed with filaments 30 Å in diameter separated by an electron dense amorphous matrix, very similar to β-type keratin found in the feather rachis. The cells of the α layer, which is immediately below the β layer, contain 80 Å filaments very similar to the α-type keratin found in hair cortex and keratinizing stratified epithelia of mammals. Large quantities of glycogen are found in the cells of each layer during their genesis. Even though a stratum granulosum is not found underneath the α layer, the cells of the clear layer develop bodies which have histochemical and ultrastructural characteristics of keratohyalin granules. The old epidermis is then shed in toto at the junction of the clear layer (above) and the Oberhäutchen (below).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335586
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The sensory papilla X-organ in Boreomysis arctica (Krøyer) (Crustacea Malacostraca Mysidacea) (1969)
    Springer
    Cell & tissue research 101 (1969), S. 88-97 
    Details
    ISSN: 1432-0878
    Keywords: Sensory papilla ; X-organ ; Neurosecretion ; Boreomysis arctica ; Crustacea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The SPX-organ in Boreomysis arctica (Krøyer) (Crustacea Malacostraca Mysidacea) was investigated light and electron microscopically. The organ consists of a group of cells (the SPX-cells) and a vesicle surrounded by a connective tissue sheath. It is situated near the base of the sensory papilla of the eye-stalk. Neurosecretory material is produced in the SPX-cells and transported in axon-like projections from these cells into the vesicle. These processes contain no neurotubuli. Numerous fibres from an afferent nerve emanating from the medulla terminalis also enter the vesicle, where they form a dense irregular meshwork. This nerve transports no neurosecretory material. There are numerous synaptic contacts between the afferent nerve fibres and the neurosecretory processes from the SPX-cells. The neurosecretory material released from them accumulates in haemocoelic spaces in the vesicle. Release is most probably effected by the afferent nerve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335587
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The pancreatic islet system of the mouse (Mus musculus) (1969)
    Springer
    Cell & tissue research 101 (1969), S. 28-62 
    Details
    ISSN: 1432-0878
    Keywords: Electron microscopy ; Islet of Langerhans ; Pancreatic hormones ; Classification of endocrine cells ; Stereology of endocrine granules ; Biostatistics ; Insulin immunization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pancreatic islet in the mouse has a highly complex and heterogeneous structure. It contains Aa, Ab, Ac, B, C, D, E, and F cells. The classification of cell types is primarily based on the shape, size and electron opacity of secretory granules and on the spatial relationship of the granules to their unit membranes. Morphological evidence is supported by a statistical analysis of the size distribution of granules and of their membranes. Experimental immunization of mice with insulin, provides additional data to support the existence of eight different cell types in the islet of the normal animal and reveales marked immunological stimulation of B cells, secondary stimulation of Aa, D and F cells, atrophy of Ac cells and hyperplasia of C cells. It is proposed that corresponding cell types exist in other mammals and man. The experimental insulin immunization process appears to perform an immunofunctional analysis of the islet, and suggests that in mice the Aa, D and F cells might be involved in cell energy supply. Lipocaic and some pancreatic factors with insulin-like activity (NSILA) will likely find their morphological equivalents. It is proposed that chemical solubility techniques represent the most promising avenues of approach to the isolation of secretory products from the endocrine pancreas, and that the assay of these extracts should primarily be conducted at the cell level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335584
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Identification of enterochromaffin cells in adjacent Epon-embedded sections at light and electron microscopic levels (1969)
    Springer
    Cell & tissue research 102 (1969), S. 193-204 
    Details
    ISSN: 1432-0878
    Keywords: Electron microscopy ; Enterochromaffin cell ; Duodenum ; Histological stainings ; Intestinal mucosa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Methods for light and electron microscopic comparison of individual argentaffin and argyrophil enterochromaffin cells (EC) in the sheep duodenal mucosa are described. These silver procedures were applied for light microscopy to Epon-embedded sections. The adjacent sections were examined with the electron microscope. The most specific characteristics of the argentaffin and argyrophil EC in electron microscopy are highly osmiophilic cytoplasmic granules. In one cell type these granules are smaller and more roundish than in the another type. These two cell types are stainable both by the argentaffin and argyrophil reactions. No essential difference can be observed in the localization of these elements. It is suggested that both cell types belong to the enterochromaffin system. Both silver methods are also suitable for the light microscopic identification of other intestinal structures in sections adjacent to that sectioned for electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335500
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Morphometrisch-ultrastrukturelle Untersuchungen am Nucleus supraopticus der Ratte nach Dehydratation (1969)
    Springer
    Cell & tissue research 102 (1969), S. 172-181 
    Details
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Dehydration ; Electron microscopy ; Morphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Der Nucleus supraopticus der Ratte, die einer Dehydratation ausgesetzt war, wurde ultrastrukturell-morphometrisch analysiert. Dabei zeigte sich, daß die relativen Volumenanteile der einzelnen Zellkompartimente während der fünftägigen Durstperiode eine auffallende Konstanz aufweisen. Hingegen läßt sich eine absolute Zunahme der Einzelzellvolumina und somit auch der an der Synthese und Sekretion der Neurohormone beteiligten Zellkompartimente feststellen. Die vorliegenden Befunde sprechen für einen beschleunigten Abtransport des neurosekretorischen Materials bei gesteigerter Synthese. Auf eine optimale Standardisierung der Perfusionsmethode bei Untersuchungen am neurosekretorischen Zwischenhirnsystem wird hingewiesen.
    Notes: Summary The supraoptic nucleus of the dehydrated rat has been analysed by electron microscopy and morphometry. With that it appears, that the relative volumes of the different cell compartments are striking constant. Otherwise one can see an absolute increase of the cell volume together with the cell compartments which take part at the synthesis and secretion of the neurohormones. These results are expression of an accelerated move of the neurosecretory material during increased synthesis. The importance of an optimal standardization of the perfusion-method in investigations of the neurosecretory system is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335498
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Ependymal specializations (1969)
    Springer
    Cell & tissue research 102 (1969), S. 153-171 
    Details
    ISSN: 1432-0878
    Keywords: Toad ; Median eminence ; Ependyma ; Neurosecretion ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The primary plexus of the toad hypothalamic-adenohypophysial portal system has two types of loops. The short loops are localized in the external region of the median eminence and surrounded by nerve endings and glial cells. The long loops approach the ependymal lining of the median eminence. The ascending and descending branches of these loops are surrounded by nerve and ependymal endings and glial cells. The actual subependymal portion of the long loops is virtually in contact with ependymal processes only, which form a “cuff” interposed between this portion of the long loops and the fibres of the hypothalamic-neurohypophysial tract. Many of the vascular endings of the ependymal processes have electron dense granules whose diameter ranges between 700 and 1400 Å. The ultrastructure of the ependymal cells suggests that these granules are transport material and not secretory material. This anatomical arrangement linking the ependyma of the median eminence and the long loops of the primary plexus of the hypothalamic-adenohypophysial portal system makes the possibility of an interrelationship between the cerebrospinal fluid and the portal blood very considerable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335497
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Morphometrisch-ultrastrukturelle Untersuchungen am Hypophysenhinterlappen der Ratte nach Dehydratation (1969)
    Springer
    Cell & tissue research 102 (1969), S. 182-192 
    Details
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Dehydration ; Electron microscopy ; Morphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Der Hypophysenhinterlappen von Ratten, die einer Dehydratation unterworfen waren, wurde ultrastrukturell-morphometrisch untersucht. Als wichtigster Befund wurde bereits nach 36stündiger Dehydratation eine massive Abnahme der Neurosekretgranula festgestellt. Gleichzeitig ist ein signifikanter Anstieg der Fettkörper in den Pituicyten zu verzeichnen. Die Fettkörper können nach Ansicht der Autoren als Endprodukt der Membranreste oder der Trägersubstanz des Neurohormons interpretiert werden. Eine Mitbeteiligung der Lysosomen bei ihrer Verarbeitung wird diskutiert.
    Notes: Summary The neurohypophysis of the rat after dehydration has been studied by electron microscopic and morphometric methods. As the main result we found a massive decrease of the neurosecretory granules already at a dehydration of 36 hours. At the same time one can note a significant increase of fat vacuoles in the pituicytes. These fat vacuoles could be the final product of residual membranes or of the carrier substance of the neurohormones. The possibility of a functional role of lysosomes in the catabolism is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335499
    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...