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  • Rat  (24)
  • Histochemistry  (18)
  • Springer  (42)
  • American Geophysical Union
  • Irkutsk : Ross. Akad. Nauk, Sibirskoe Otd., Inst. Zemnoj Kory
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • Wiley
  • 2015-2019
  • 2005-2009
  • 1975-1979
  • 1970-1974  (42)
  • 1973  (42)
Collection
Keywords
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  • Springer  (42)
  • American Geophysical Union
  • Irkutsk : Ross. Akad. Nauk, Sibirskoe Otd., Inst. Zemnoj Kory
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • Wiley
Years
  • 2015-2019
  • 2005-2009
  • 1975-1979
  • 1970-1974  (42)
Year
  • 1
    Electronic Resource
    Electronic Resource
    A comparison of histological methods for demonstrating calcification (1973)
    Springer
    Calcified tissue international 12 (1973), S. 169-173 
    Details
    ISSN: 1432-0827
    Keywords: Calcification ; Histochemistry ; Autoradiography ; Fetal ; Mandible
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Des rats femelles reçoivent du45Ca ou du32P au 13ème et 18ème jour de la grossesse. Les coupes sériées des têtes de foetus sont étudiées par autoradiographie et par diverses méthodes histologiques pour déterminer la calcification. La détection la plus précoce de45Ca s'observe simultanément comme une réaction positive pour le calcium avec une des méthodes histologiques utilisées.32P est en évidence par les méthodes autoradiographiques un peu plus tard que le45Ca et sa présence coincide avec la réaction positive la plus précoce observée avec les autres méthodes histologiques utilisées. Les os de ces têtes foetales commencent à se calcifier selon un mode particulier commençant par la mandibule, puis l'os frontal et le maxillaire supérieur, suivis par les os nasaux, pariétaux et interpariétaux.
    Abstract: Zusammenfassung Weibliche Ratten erhielten45Ca und32P zwischen dem 13.–18. Tag der Schwangerschaft. Zur Ermittlung der Verkalkung wurden Serienschnitte der Köpfe ihrer Feten mittels Autoradiographie sowie durch verschiedene histologische Methoden untersucht. Das erste Auftreten von45Ca war ebenfalls von einer positiven Calciumreaktion mittels einer der verwendeten histologischen Methoden begleitet.32P wurde in der Autoradiographie erst etwas später als45Ca festgestellt und dessen Nachweis deckte sich mit den ersten positiven Reaktonen aller anderen verwendeten histologischen Methoden. Die Knochen in diesen Fetusköpfen begannen in einer bestimmten Sequenz zu verkalken: zuerst der Unterkiefer, dann das Stirnbein und der Oberkiefer, dann das Nasenbein, die Parietal- und Interparietalknochen.
    Notes: Abstract Female rats were given45Ca or32P from 13 to 18 days of pegnancy. Serial sections from the heads of their fetuses were studied by autoradiography, as well as by several histological methods for assessing calcification. The earliest detection of45calcium occured at the same time as a positive reaction for calcium with one of the histological methods used.32P was not detectable by autoradiographic methods until somewhat later than45Ca, and its presence coincided with the earliest positive reaction with all of the other histological methods employed. The bones in these fetal heads began to calcify in a partcular sequence, the mandible first, then the frontal bone and maxilla, followed by the nasal, parietal and interparietal bones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02013732
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  • 2
    Electronic Resource
    Electronic Resource
    Cell kinetics and morphology of the growth plate in the normal and hypophysectomized rat (1973)
    Springer
    Calcified tissue international 13 (1973), S. 113-129 
    Details
    ISSN: 1432-0827
    Keywords: Kinetics ; Growth ; Epiphyses ; Hypophysectomy ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé La largeur de la métaphyse tibiale, la zone indifférenciée, la zone sériée et les cellules en dégénerescence ont été observées chez des rats Sprague-Dawley normaux et hypophysectomisés. La production cellulaire de la métaphyse est déterminée sur la base de la croissance osseuse longitudinale déterminée par l'oxytétracycline et la taille des cellules en dégénérescence. La diminution de la croissance osseuse longitudinale, en fonction de l'augmentation de l'âge et après hypophysectomie, est due partiellement, à la diminution de production cellulaire et partiellement à une décroissance de la taille des cellules en dégénérescence dans la métaphyse. L'influence de la production cellulaire et de l'activité mitotique prédomine.
    Abstract: Zusammenfassung Die Breite der proximalen Wachstumsplatte der Tibia, deren undifferenzierter und säulenförmiger Zone und die Größe der nahe bei der Metaphyse auftretenden degenerativen Zellen wurden in normalen und hypophysektomierten Sprague-Dawley-Ratten bestimmt. Die Zellproduktion in der Wachstumsplatte wurde aus dem longitudinalen Knochenwachstum berechnet, welches mittels Oxytetracyclin und der Größe der degenerativen Zellen bestimmt wurde. Es wurde festgestellt, daß die Abnahme des longitudinalen Knochenwachstums bei zunehmendem Alter und nach Hypophysektomie zum Teil einem Rückgang in der Zellproduktion, zum Teil einer Verminderung der Größe der degenerativen Zellen in der Wachstumsplatte zuzuschreiben ist. Der Einfluß der Zellproduktion, und somit der mitotischen Aktivität, herrscht vor.
    Notes: Abstract The width of the proximal growth plate of the tibia, its undifferentiated and columnar zone and the size of the degenerative cell close to the metaphysis, were determined in normal and hypophysectomized Sprague-Dawley rats. The cell production in the growth plate was calculated from the longitudinal bone growth determined with oxytetracycline and the degenerative cell size. It was found that the decrease in longitudinal bone growth with increasing age and after hypophysectomy, is due partly to a decrease in cell production, and partly to a decrease in degenerative cell size in the growth plate. The influence of cell production and thus the mitotic activity predominates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02015402
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  • 3
    Electronic Resource
    Electronic Resource
    A morphologic and histochemical study of biliary atresia in lamprey liver (1973)
    Springer
    Cell & tissue research 136 (1973), S. 85-96 
    Details
    ISSN: 1432-0878
    Keywords: Liver ; Lampetra ; Physiological biliary atresia ; Electron microscopy ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A morphologic and histochemical study was carried out on the liver of larval and adult lampreys at the optical and electron microscopic level. In the larva the liver is composed of blind ending single cell thick tubules of hepatocytes. The tubular lumina provided with microvilli are morphologically comparable with the canalicular lumens of the higher species of animals. The cytoplasm of the hepatocytes contains numerous inclusions with heterogeneous appearance and crystalline material. The biliary system is composed of numerous bile ductules and ducts. In the adult lamprey, the biliary system has disappeared. The hepatocytes loose their tubular arrangement and the characteristic differentiation of their biliary pole. In contrast to previous reports in the literature the presence of bile pigment in the adult lamprey liver could not be demonstrated with any histochemical technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307681
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  • 4
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Untersuchungen zur funktionellen Morphologie des Tubero-hypophysären Systems der Ratte (1973)
    Springer
    Cell & tissue research 139 (1973), S. 101-148 
    Details
    ISSN: 1432-0878
    Keywords: Infundibulum ; Rat ; Neuro-glial synapses ; Neuro-Vascular contacts ; Corticotropin-Releasing Factor ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung 1. Die Gefäßfortsätze von ependymalen und subependymalen Zellen bilden in der subependymalen Zone und in der Zona interna des Ratteninfundibulum mit Nervenfasern kompakte neuro-gliöse Faserbündel, die sich in der Zona externa aufzweigen. 2. In allen Zonen des Infundibulum kommen zwischen den Nervenfasern und den Gefäßfortsätzen zahlreiche neuro-gliöse Synapsen vor. In den Gefäßfortsätzen fällt die hohe Zahl an Mikrotubuli sowie die zahlreichen, vielgestaltigen Einschlüsse auf. 3. In der subependymalen Zone sind die Interzellularspalten an bestimmten Stellen außerordentlich weit. Sie haben eine kanalartige Beschaffenheit und enthalten feine Bündel von Nervenfasern. 4. Von den lateralen Anteilen des Infundibulum her erreichen Dendriten von Ganglienzellen des Nucleus infundibularis die Mitte des Infundibulum. In dieser Region sind axodendritische Synapsen anzutreffen. 5. Morphometrische Analysen der Nervenfaserendigungen der Zona externa von Normaltieren zeigen, daß die prozentuale Verteilung der nach Granulagröße differenzierten Nervenfaserklassen für Mitte und Seite der Zona externa etwa gleich ist. Zwischen der Größe der Elementargranula und der Anschnittfläche der zugehörigen Nervenfasern besteht eine direkte Beziehung. 6. Die Nervenfaserendigungen erreichen die Basalmembran des perikapillären Raumes fast ausschließlich im Bereich von gefäßwärts gerichteten Vorwölbungen der Zona externa. Das Ausmaß, in dem Nervenfasern im Vergleich zu den Gefäßfortsätzen von Ependymund Gliazellen den perivaskulären Raum erreichen, ist medial weitaus größer als lateral. 7. Bei bilateral adrenalektomierten Ratten nimmt in bestimmten, vorwiegend lateral gelegenen Nervenfasern die Zahl und Größe der Elementargranula in Abhängigkeit von der Überlebensdauer zu. Dies dürfte auf eine verstärkte Synthese und Speicherung von Corticotropin-Releasing Factor in diesen Nervenfasern zurückzuführen sein. Gegenüber dem Normalbefund ist die neurohämale Kontaktfläche erheblich vergrößert. Der perivaskuläre Raum enthält zerfallene Nervenfaserteile, die durch Bindegewebszellen phagocytiert werden. Diese Veränderungen dürften durch eine unter Versuchsbedingungen verstärkte Wachstumstendenz der Nervenfasern in Richtung auf die Blutgefäße und durch eine Abschnürung der Nerven-faserendigungen ausgelöst werden.
    Notes: Summary 1. In the subependymal and internal zones of the rat median eminence nerve fibres and vascular processes of ependymal and subependymal cells form neuro-glial bundles. They branch in the external zone. 2. In all these three zones of the infundibulum numerous neuro-glial synapses are found between nerve fibres and vascular processes of glial cells. The vascular processes contain a high number of microtubules as well as polymorphous granular inclusions. 3. In certain regions of the subependymal layer the intercellular spaces are enlarged. They form channel-like spaces containing small bundles of delicate nerve fibres. 4. Nerve cells of the infundibular nucleus located in the lateral parts of the infundibulum send dendrites to the medial parts of the infundibulum. In this area axo-dendritic synapses are found. 5. For morphometric analysis, the nerve fibres of the external zone were classified according to the diameter of their granules. It is shown that in the different regions of the external zone the distribution of the various types of nerve fibre is similar. Moreover it can be seen that a direct correlation exists between the size of the sectional plane of a given nerve fibre and the size of the granules it comprises. 6. Nerve fibre endings abutting on the basement membrane of the pericapillary space are mostly found in bulb-like protrusions of the external zone. The extent to which nerve fibres reach the perivascular space—as compared with the vascular processes of ependymal and glial cells—is higher in the medial than in the lateral parts of the infundibulum. 7. In bilaterally adrenalectomized rats the number and diameter of elementary granules increases in nerve fibres located laterally. This increase is directly related to the survival time and may be due to an enhanced synthesis and storage of Corticotropin-Releasing Factor in these nerve fibres. Compared with the findings in untreated animals the neurohemal contact area is significantly enlarged. The perivascular space contains degenerating nerve fibres which are undergoing phagocytosis by connective tissue cells. It is assumed that these alterations are due to the increased growth of nerve fibres towards the vessels of the “Mantelplexus”, and that, following adrenalectomy, this excessive growth leads to a pinching off of nerve fibres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307465
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  • 5
    Electronic Resource
    Electronic Resource
    The adrenergic innervation of the renal artery and vein of the rat (1973)
    Springer
    Cell & tissue research 138 (1973), S. 261-272 
    Details
    ISSN: 1432-0878
    Keywords: Extrarenal blood vessels ; Rat ; Adrenergic nerves ; Fluorescence microscopy ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The adrenergic innervation of the extrarenal blood vessels of the rat left kidney was investigated by fluorescence histochemistry and by electron microscopy. The trunk of the renal artery proximal to the aorta is elastic and appears to be very sparsely innervated. In contrast, near the kidney the renal artery—which divides into 3 to 4 large branches of the muscular type possesses a dense adrenergic innervation. The adrenergic terminal axons are situated in the adventitia close to the external elastic lamella, but only rarely in close contact with smooth muscle cells. In most instances several terminal axons are grouped and enclosed by a Schwann cell, single axons being rare. All terminal axons are able to take up and to store 5-hydroxydopamine which strongly suggests that they are adrenergic. The innervation of the renal vein is more sparse than that of the muscular arteries but somewhat denser than that of the elastic artery. In addition, close to the origin of the renal artery the presence of “small intensively fluorescent” (SIF) cells as well as of some adrenergic ganglion cells is noted. The latter are situated in the adrenergic nonterminal axon bundles, which run parallel to the blood vessels. It is concluded that the uneven adrenergic innervation along the artery as well as individual variations in the branching of the artery are the main causes of the unusually high individual variations of the NA content of this organ such as used in pharmacological experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306611
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  • 6
    Electronic Resource
    Electronic Resource
    Histochemical studies on the morphology of the golgi apparatus and its relationship to catecholamine biosynthesis in the locus coeruleus of the rat (1973)
    Springer
    Cell & tissue research 136 (1973), S. 329-348 
    Details
    ISSN: 1432-0878
    Keywords: Locus coeruleus (Rat) ; Neurons ; Golgi apparatus ; Catecholamine biosynthesis ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Detailed histochemical studies have been performed on the morphology of the Golgi apparatus (GA) by application of the thiamine pyrophosphatase (TPPase) method (Novikoff and Goldfischer, 1961) to the neurons of the locus coeruleus (LC) of normal and catecholamine biosynthesis inhibitors (fusaric acid and D, L-α-methyl-p-tyrosine methylester HCl) given adult healthy male Wistar strain rats. The neurons were classified into five categories on the basis of the morphology of the Golgi apparatus. The number of cells in individual categories was counted to evaluate the percentage of each category in the whole nucleus. The majority of cells belongs to Types II, III, and IV whose GA goes through cyclic activity, but the remaining neurons belong to Types I and V which may have a strong tendency to be different from the former in character. The latter neurons correspond formally with Types I and V of the rabbit LC, but they do not respond to the drugs administered. The rat LC is very similar to the dorsal vagal nucleus of the rabbit in regard to the dominant category. The present results indicate that the majority of the rat LC neurons may work vigorously and they may be motor neurons. Administration of the drugs caused reduction of TPPase activity, augmentation of disintegration and the budding-off process of the GA of Type IV, a decrease in the percentage of Type IV and an increase in that of Type II. Administration of 100 mg/kg fusaric acid caused maximal morphological change of the GA at the 90th minute; however, administration of 200 mg/kg fusaric acid showed more marked change of the GA, having two peaks and two valleys. The GA revealed much more intense reaction to D,L-α-methyl-p-tyrosine methylester HCl than to fusaric acid. The present results indicate that tyrosine hydroxylase may be the rate-limiting enzyme in the catecholamine biosynthesis. These noticeable changes of GA caused by administration of the drugs were completely restricted to the neurons of LC and the neurons of the mesencephalic nucleus of the trigeminal nerve did not show any morphological changes of the GA. These results strongly suggest that the GA of the rat LC neurons may have ability to synthesize catecholamine whereas the GA of the rat mesencephalic nucleus of the trigeminal nerve may be completely devoid of this ability and that the role of the GA may be different depending on the anatomical regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307038
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  • 7
    Electronic Resource
    Electronic Resource
    Electron microscopic observations on the mucous secretory activity of the human gallbladder epithelium (1973)
    Springer
    Cell & tissue research 139 (1973), S. 463-471 
    Details
    ISSN: 1432-0878
    Keywords: Gallbladder (Human) ; Mucus secretion ; Reverse pinocytosis ; Histochemistry ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Mucous secretory activity of the human gallbladder epithelium was investigated by light and electron microscopy and with histochemical techniques. There are two types of granules in the supranuclear region of the epithelial cells. The one low in density contains a fine filamentous material and gives a strongly positive silver methenamine reaction. The other is dense and only faintly positive. The granules of the former are considered to be mucous secretory granules and the granules of the latter may be lysosomes. PAS positive granules correspond presumably to both types of granules mentioned above. The mucous secretory granules are considered to be synthesized by the Golgi apparatus and the granular endoplasmic reticulum as has been confirmed in other mucous secretory cells. Their content is released from the cell by reverse pinocytosis. Typical goblet cells occur frequently in the fetal epithelium, but cannot be observed in the adult specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02028388
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  • 8
    Electronic Resource
    Electronic Resource
    Modifications des cellules gonadotropes de la préhypophyse chez la ratte injectée de testostérone au cours du cycle oestral (1973)
    Springer
    Cell & tissue research 138 (1973), S. 63-73 
    Details
    ISSN: 1432-0878
    Keywords: Adenohypophysis ; Rat ; Gonadotrophic cells ; Cycle, influence of testosterone ; Light microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 4-day cyclic adult female Wistar rats were injected subcutaneously with testosterone propionate on diestrus 1 at 16:00 and on diestrus 2 at 10:00 respectively. Non-injected females served as controls. Autopsy was performed on diestrus 2 at 23:00, and on proestrus at 14:00 and 17:00 respectively. The blue Alcian-PAS staining was used to evidence FSH (β) and LH (γ) pituitary cells. In control animals and in diestrus 2 injected females only a small number of FSH cells could be detected on diestrus 2 at 23:00. This number increased markedly on proestrus at 14:00 and decreased on proestrus at 17:00. A similar evolution was observed in diestrus 1 testosterone injected females, but the number of FSH cells appeared higher at any stage of autopsy in these females than in diestrus 2 injected females and in control rats. In control females, numerous LH cells were observed on diestrus 2 at 23:00. The number of these cells was diminished on proestrus at 14:00 and still more at 17:00. On the contrary few LH cells were detected in testosterone injected females on the evening of diestrus 2. An increase of these cells occurred on proestrus at 14:00, followed at 17:00 by only a weak diminution as established by comparison with control animals. An inhibition of FSH release and a suppression of the proestrus surge of LH were therefore supposed to cause, on one hand, the slowing up of follicular growth observed in diestrus 1 injected females and, on the other hand, the blockage of ovulation noted in both diestrus 1 and diestrus 2 treated animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307078
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  • 9
    Electronic Resource
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    Distribution of succinate-, α-glycerophosphate-, NADH-, and NADPH dehydrogenases (tetrazolium reductases) in the hippocampal region of the rat during postnatal development (1973)
    Springer
    Cell & tissue research 141 (1973), S. 347-373 
    Details
    ISSN: 1432-0878
    Keywords: Hippocampal region (rat) ; Distribution of dehydrogenases ; Postnatal development ; Histochemistry ; Light microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Succinate-, α-glycerophosphate-, NADH-, and NADPH dehydrogenases (tetrazolium reductases) were studied histochemically in brain sections. The distribution of these enzymes in the hippocampal region was mapped in different postnatal stages. In addition to the hippocampus and the dentate area which have also been dealt with by other authors, the description includes the entorhinal area, parasubiculum, presubiculum, and subiculum. In all the areas of the hippocampal region the enzyme activity is first localized mainly in cell bodies. Activity in the neuropil shows a tendency to increase with age throughout the stages studied. Examples of particularly early or late differentiation of the histochemical pattern exist. Thus already after 4–6 days the differentiated staining pattern in the hippocampal layers as seen in the adult, begins to appear. In the entorhinal area the early enzyme distribution agrees with that in the adult and facilitates identification of its layers. After 22 days the fundamental enzyme chemoarchitectonics of the adult rat brain has been obtained. Histochemical characteristics of the different areas, support the view that the hippocampal region constitutes an entity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307411
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  • 10
    Electronic Resource
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    Distribution of acetylcholinesterase in the hippocampal region of the rat during postnatal development (1973)
    Springer
    Cell & tissue research 141 (1973), S. 375-400 
    Details
    ISSN: 1432-0878
    Keywords: Hippocampal region (rat) ; AChE distribution ; Postnatal development ; Histochemistry ; Light microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Acetylcholinesterase (AChE) in the hippocampal region was studied histochemically in different postnatal stages. Enzyme changes are described for the hippocampus proper, the dentate area, the entorhinal area, parasubiculum, area retrosplenialis e, presubiculum, and subiculum. In 1 day old animals there are only traces of AChE in solitary perikarya of the hippocampal stratum radiatum, while there is no activity in the neuropil. This is in contrast to other regions of the brain, e.g. the corpus striatum and the medial septum. Enzyme activity in the neuropil, although very weak, is seen clearly on the 2nd day. While the enzyme reaction in some cell soma seems to be permanent and also present in adult rats, other cell bodies, e.g. in the entorhinal area lose AChE activity during the last part of the 2nd week and in the 3rd week. Similar observations have been made on other parts of the central nervous system. The main features of chemodifferentiation in the hippocampal region seem to be completed by the end of the third week, although most layers and areas have not yet achieved the same high staining intensity as seen in the adult rats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307412
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  • 11
    Electronic Resource
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    Effects of parathyroid hormone on osteoclasts in vivo (1973)
    Springer
    Cell & tissue research 141 (1973), S. 529-544 
    Details
    ISSN: 1432-0878
    Keywords: Osteoclast ; Parathyroid hormone ; Lysosomes ; Bone resorption ; Electron microscopy ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Young rats were treated with high doses of parathyroid hormone (PTH). Osteoclasts from these animals revealed characteristic alterations in comparison to control cells: a) The cytoplasm contained large vacuoles with phagocytosed cells, some of which resembled osteoblasts or osteocytes. The vacuoles were interpreted as lysosomes because the engulfed cells often appeared partly digested and the vacuoles contained acid phosphatase as demonstrated histochemically, b) lipid droplets were present in the cytoplasm and usually located close to the endoplasmic reticulum and/or in regions with many free ribosomes, c) the Golgi complex was more frequently separated from the nuclei than in control cells, d) small coated cytoplasmic bodies were numerous in the peripheral cytoplasm, e) the membranes of the endoplasmic reticulum were fused in some places, f) cytoplasmic regions with numerous free ribosomes were frequent, g) large ring-shaped granules occurred in some mitochondria. Energy dispersive X-ray analysis of these granules provided evidence that they contained calcium and probably phosphorus, h) in some osteoclasts the mitochondria were enlarged. — The findings are consistent with an increased activity of osteoclasts and in particular a stimulation of the lysosomal system in these cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307123
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  • 12
    Electronic Resource
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    Ultrastructural features of rat pituicytes in organotypic culture (1973)
    Springer
    Cell & tissue research 143 (1973), S. 107-116 
    Details
    ISSN: 1432-0878
    Keywords: Neurohypophysis ; Rat ; Pituicytes ; Organotypic culture ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Neural lobes of adult rats have been explanted and organ-cultured for 5–10 days. While perivascular cells and neurosecretory fibers undergo a progressive degeneration, scattered pituicyte-like cells are observed mostly associated with each other in number of two or three cells for group. Cultured pituicytes are quite similar to in vivo pituicytes except for some particular features as the shape of the nucleus and the number of dense bodies. Furthermore they share with the in vivo pituicytes the phagocytic capacity which appears even increased as far as neurosecretory fibers are concerned. Finally, degenerating pituicytes and free lipid droplets are observed in the intercellular spaces: the significance of these facts is discussed and tentatively interpreted. The organotypic culture of the neural lobe seems to represent an experimental model useful to obtain a relatively pure population of pituicytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307454
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  • 13
    Electronic Resource
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    New types of endoplasmic reticulum in neurons of the paracervical ganglion of the rat (1973)
    Springer
    Cell & tissue research 143 (1973), S. 505-515 
    Details
    ISSN: 1432-0878
    Keywords: Endoplasmic reticulum ; Paracervical ganglion (Rat) ; Neurosecretion ; Electron microscopy ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Two new types of structure of the cytoplasm of an autonomic neuron were described: (1) Inclusions of the rough ergastoplasmic reticulum, which were named “ergastosomes”, contain finely granular material with moderately electron opaque staining with both glutaraldehyde-OsO4 and KMnO4 fixations. A short comment was made on the nature of the contents of the ergastosomes. (2) Tubular formations of endoplasmic reticulum were found in the axons and/or dendrites of the paracervical ganglion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306769
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  • 14
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    Electron microscopic study of rat pituitary primordium in organ culture (1973)
    Springer
    Cell & tissue research 146 (1973), S. 453-461 
    Details
    ISSN: 1432-0878
    Keywords: Hypophysis ; Primordium ; Rat ; Organ culture ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary To see whether adenohypophysial tissue has the capacity of self-differentiation, Rathke's pouch together with part of the neurohypophysial primordium was isolated from 12-(Group A), 14- (Group B) and 15-day-old (Group C) rat fetuses and cultivated for 9, 6 and 5 days, respectively. Electron microscopic examination of these explants showed many adenohypophysial cells containing electron dense granules, indicative of cytodifferentiation in all groups. Three cell types were distinguishable on the basis of the size of their granules. Variable amounts of neurohypophysial tissue were seen in some explants of Groups B and C, but not A. This “pars nervosa” contained pituicytes with lipid-like inclusions in their cytoplasm but no neurosecretory axons. The adenohypophysial cells abutting on the pars nervosa were arranged rather regularly like cells of the pars intermedia which contained a few granules of about 200 mμ diameter. From these data it is concluded that in rats granule formation in the adenohypophysial primordial cells starts in the absence of hypothalamic neurosecretory substances. It is uncertain from this study whether these cells actually contain hypophysial hormones.
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    The ultrastructure of the duct system in the rat extraorbital lacrimal gland (1973)
    Springer
    Cell & tissue research 144 (1973), S. 453-466 
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    ISSN: 1432-0878
    Keywords: Lacrimal gland ; Rat ; Duct system ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The duct system of the rat exorbital lacrimal gland consists of intercalated ducts, interlobular ducts and excretory ducts. The morphological changes from one type of duct to the next are gradual. At the light microscopical level this consists of a change from a bilaminar epithelium in the intercalated ducts to an epithelium, consisting of approximately three layers — which may be pseudostratified — in the excretory ducts. The basal layer of the intercalated ducts consists of myoepithelial cells, whereas the inner epithelial cells may have both a secretory and an electrolyte transporting function. The interlobular duct epithelium contains many cells with deep infoldings of the basolateral plasma membranes and associated mitochondria, suggesting a similar function to the striated duct epithelium in salivary glands. Numerous basal cells in this epithelium have tentatively been interpreted as unusual myoepithelial cells. Nerve terminals have been observed in the ductal epithelium.
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    Quantitative data on the fine structural organization of the palisade zone of the median eminence (1973)
    Springer
    Cell & tissue research 136 (1973), S. 111-120 
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    ISSN: 1432-0878
    Keywords: Median eminence ; Rat ; Granular vesicles ; Ultrastructure ; Quantitative evaluation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In order to characterize different sub-zones in the palisade zone of the rat median eminence, quantitative ultrastructural parameters were applied to brains fixed in aldehyde-osmium tetroxide. The palisade zone has been subdivided in 4 successive sub-zones. Increasing numbers of granular vesicles (GV), especially those smaller than 110 nm, are observed from dorsal to ventral sub-zones. There also are more GV per unit area of nervous tissue in the perivascular than in the more dorsal sub-zones. The individual nerve profiles exhibit a larger size in the perivascular layer than in the more dorsal areas, whereas the number and size of nerve profiles devoid of vesicles diminish from dorsal to ventral. As a consequence more GV occur in the perivascular nerve profiles. In the GV containing nerve profiles the concentration of GV is, however, constant in the different sub-zones. A fluctuating size of the preterminal and terminal parts of the nerve fibres is suggested.
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    Ultrastructural changes in rat epididymis after vasectomy (1973)
    Springer
    Cell & tissue research 136 (1973), S. 177-182 
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    ISSN: 1432-0878
    Keywords: Rat ; Epididymis ; Effect of vasectomy ; Spermatozoa ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Epididymal biopsies from rats that had undergone unilateral or bilateral vasectomies from one to eight months previously were compared with biopsies from their contralateral side or from normal controls to ascertain what ultrastructural changes had occurred. After vasectomy, spermatozoa appeared to dissolve in the lumen of the caput epididymidis and to be absorbed by the principal cells. About 5 weeks after vasectomy, numerous lamellar accumulations became apparent in the supernuclear region. Their resemblance to lysosomes or residual bodies was confirmed by an acid phosphatase reaction. After 10 weeks, similar lamellar and polymorphic accumulations on the contralateral side of animals with unilateral vasectomies indicated that resorption had also increased on the unligated side.
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    URL: http://dx.doi.org/10.1007/BF00307438
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    Histochemical demonstration of Δ5-3 ß-OHD activity in the granulosa cells of ovarian follicles of immature and mature mice correlated with some ultrastructural observations (1973)
    Springer
    Cell & tissue research 136 (1973), S. 215-228 
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    ISSN: 1432-0878
    Keywords: Ovary (mouse) ; Granulosa cells ; Steroidogenesis ; Electron microscopy ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A systematic study of Δ5-3β-hydroxysteroid dehydrogenase in the granulosa cells of immature and mature mice was made. The histochemical results were compared with the ultrastructural findings on the same cells in an attempt to determine whether the granulosa cells are capable of a steroidogenic role. In newborn and immature mice the granulosa cells of a great amount of follicles demonstrated a moderate or strong histochemical activity. In mature mice the granulosa cells demonstrated a weak or moderate activity normally only in preovulatory follicles and in some other atretic follicles. The granulosa cells of the normal developing follicles did not show such activity. In addition the histological control of numerous parallel sections demonstrated particularly in immature ovaries the presence of a great amount of atretic follicles. In the cytoplasm of the granulosa cells of the follicles in immature ovaries only clusters of lipid droplets with ribosomes were noted; while in the preovulatory follicles of mature animals there started to appear mitochondria with tubular cristae, smooth membranes of the endoplasmic reticulum and irregular lipid droplets. In the obviously atretic follicles several granulosa cells as well as theca interna cells showed numerous lipid droplets and ribosomes together with different degenerating organelles. The granulosa cells of the normal developing follicles showed a well developed Golgi complex, granular endoplasmic reticulum and free ribosomes. The histochemical and ultrastructural findings suggest a steroidogenic role of the granulosa cells only in the larger preovulatory follicles (probably related to an early luteinization of this layer) but this role was not demonstrated in the same cells in normal developing follicles. In addition, since an histochemical positivity was demonstrated also in the granulosa cells of some obviously atretic follicles, it is possible that many of the follicles having granulosa cells filled with lipid droplets and attached ribosomes and histochemically positive might be, in the immature ovaries, in a very precocious stage of atresia. It is to precise for these cells whether a cytoplasm with these two strictly correlated components (lipid droplets and attached ribosomes) and showing an histochemical positivity could carry-on all the biochemical steps involved in steroid biosynthesis or only has only a temporary capability to produce some precursors of steroids.
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    The effects of desiccation and starvation upon the weight, histology and ultrastructure of the reproductive tract of Biomphalaria glabrata, intermediate host of Schistosoma mansoni (1973)
    Springer
    Cell & tissue research 136 (1973), S. 229-262 
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    ISSN: 1432-0878
    Keywords: Reproductive tract ; Biomphalaria glabrata ; Desiccation ; Starvation metabolism ; Weighing experiments ; Histochemistry ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effects of desiccation (36 weeks), starvation (12 weeks) and recovery (4 weeks following 16 weeks of desiccation and 2 weeks following 9 weeks of starvation) upon the accessory sex glands and some other body parts of Biomphalaria glabrata were studied by means of weighing experiments and histochemical and ultrastructural methods. The results of the weighing experiments show that the various parts of the reproductive tract are not protected from involution processes during the adverse conditions, as some parts (the albumen gland, spermduct and prostate gland) showed a more pronounced decrease in weight than other body parts. Measurements of the epithelial heights of the accessory sex glands and ultrastructural observations corroborate the results of the weighing experiments. During the adverse conditions the organelles involved in the formation of the secretion granules (granular endoplasmic reticulum and Golgi-apparatus) became involuted. The secretion granules within the cells of the albumen gland, spermduct and prostate gland were broken down by crinophagy. This latter process was less pronounced in the oviduct, muciparous gland, oöthecal gland, uterus and vagina. During the adverse conditions the lipoprotein producing cell types (mainly in the male part) remained active longer than the polysaccharide producing cell types (mainly in the female part). The significance of this observation is discussed. The amounts of glycogen present in most tissues of the reproductive tract and of the other investigated body parts (the foot, columellar muscle and vesicular connective tissue cells) were not apparently diminished, even when the secretory cells showed clear signs of involution, as a result of long periods of adverse conditions. Within the recovery periods 50% of the snails resumed egg production. During recovery the relative increases in weight of the accessory sex glands seemed to exceed that of other body parts, indicating that the restoration of the accessory sex glands is favoured. Histologically, reactivation of the accessory sex glands was apparent after 36–72 hours of recovery. At this time secretory material was again observed within the cisternae of the gland cell Golgi-bodies. Because reactivation is fairly rapid, a nervous or hormonal control of this process appears more likely than control via the general metabolism. The possible functions of various body organs in storing food reserve material is discussed, and it is concluded that the glycogen storing vesicular connective tissue cells (which occur throughout the whole body in the connective tissue) play a major role.
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    A radioautographic study of the transport of 125I-labeled serum lipoproteins in rat aorta (1973)
    Springer
    Cell & tissue research 138 (1973), S. 223-237 
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    ISSN: 1432-0878
    Keywords: Aorta, endothelium ; Rat ; Transport of serum lipoproteins ; Radioautography ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The transport of 125I-labeled serum lipoproteins through the aortic endothelium was studied by radioautography. Rat aorta and heart was perfused in vitro with a medium containing human very low density (VLDL), low density (LDL), high density lipoprotein (HDL), delipidated HDL apolipoprotein or rat HDL. In all lipoproteins more than 95% of the radioactivity was TCA precipitable and lipid radioactivity was from 2–4% in HDL, 4–6% in LDL, 7–15% in VLDL. After 18–60 min of perfusion and wash with unlabeled medium, most of the aortic radioactivity was TCA precipitable and the percent of lipid counts was similar to that in the original lipoprotein. Following perfusion with VLDL, LDL, or HDL the radioautographic reaction was seen over the endothelium, the subendothelial space and the inner media, and was separated by an unlabeled zone from the reaction present over the adventitia. Uniform labeling of the entire wall was found after perfusion with HDL apolipoprotein. The presence of silver grains over endothelial cells in regions rich in plasmalemmal vesicles suggested that these organelles participate in the transport of the labeled lipoprotein, as was shown for lactoperoxidase (Stein and Stein, 1972). The present data indicate that cholesterol may enter the aortic wall as a constituent of lipoprotein particles. Since an HDL particle carries less than 1/20 of the cholesterol present in a LDL particle, it seems that the lower susceptibility of the female to atheromatosis might be related to the higher ratio of HDL to LDL particles in the female serum.
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    Tagesrhythmische Veränderungen im Granulationsindex der juxtaglomerulären Zellen der Rattenniere (1973)
    Springer
    Cell & tissue research 137 (1973), S. 141-143 
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    ISSN: 1432-0878
    Keywords: Juxtaglomerular cells ; Rat ; Granulation index ; Diurnal rhythm ; Statistical evaluation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Das Granulations-Index der juxtaglomerulären epitheloiden Zellen der Rattenniere unterliegt tagesrhythmischen Schwankungen, wobei die berechneten Werte in den Nachtstunden significant höher sind als in den Tagesstunden.
    Notes: Summary Marked diurnal changes occur in the granulation index of the juxtaglomerular cells in the rat kidney. According to the results the night values are significantly higher than those obtained in daytime.
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    Suppression of somatotrophs in growth hormone injected rats (1973)
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    Cell & tissue research 140 (1973), S. 309-314 
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    ISSN: 1432-0878
    Keywords: Pituitary Gland ; Rat ; Somatotropin ; Cellular Response ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The response of somatotrophs to large doses of purified bovine growth hormone was examined in uninephrectomized rats drinking 1% sodium chloride in an attempt to prolong the action of the hormone. Growth hormone produced a triphasic response in the ultrastructure of somatotrophs. Uninephrectomy and salt alone induced no changes in somatotrophs as compared to unoperated animals consuming tap water. In the first phase (3 days) the cross sectional area of the cell increased, the size of the largest granule per cell as well as the number of granules per cell increased significantly. All these parameters then reached control level after 7 days of injections during a second phase. Suppression of somatotrophs by exogenous growth hormone was evident by 16 days (third phase) when the area of the cell, the size of the largest secretory granule as well as the number of granules per cell all decreased significantly. Somatotrophs apparently did not react to suppression by a lysosomal mechanism inasmuch as no increase in the number of lysosome-derived structures was seen even at 16 days.
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    URL: http://dx.doi.org/10.1007/BF00307020
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    Karyometrische Untersuchungen am Nucleus suprachiasmaticus geblendeter Ratten (1973)
    Springer
    Cell & tissue research 143 (1973), S. 143-147 
    Details
    ISSN: 1432-0878
    Keywords: Rat ; Suprachiasmatic nucleus ; Blinding ; Retinohypothalamic connections ; Karyometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Radioaktiv markierte Aminosäuren werden bei Säugetieren nach intraokulärer Injektion nicht nur zu den primären optischen Kerngebieten, sondern auch in den Nucleus suprachiasmaticus des Hypothalamus transportiert (Moore und Lenn, 1972; Hendrickson, Wagoner und Cowan, 1972; Moore, 1973). Dieser Befund macht eine direkte Verknüpfung zwischen der Netzhaut und dem sekretorisch aktiven Nucleus suprachiasmaticus wahrscheinlich, obwohl mit Silbertechniken eine solche Verbindung nicht sicher nachgewiesen werden konnte. Karyometrische Studien am Nucleus suprachiasmaticus männlicher Wistar-Ratten zeigen 6 Tage nach beidseitiger Blendung eine signifikante Abnahme der Zellkerndurchmesser. Dieses Ergebnis spricht für eine Aktivitätsänderung der Neurone im Nucleus suprachiasmaticus geblendeter Ratten.
    Notes: Summary Intraocular injection of labeled amino acids results, in different mammals, in an accumulation of radioactive material not only in the primary optic centers but also within the hypothalamic suprachiasmatic nucleus (Moore et al., 1972; Hendrickson et al., 1972; Moore, 1973). This finding argues in favour of a direct connection between the retina and the secretory suprachiasmatic nucleus although silver techniques do not show such a pathway. In male Wistar rats the nuclear diameter of the suprachiasmatic neurons decreases significantly 6 days after bilateral experimental ablation of the retina. These results indicate an alteration in activity of the suprachiasmatic neurons in blinded rats.
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    Influence de la méthode de fixation sur l'observation des divisions cellulaires dans l'adénohypophyse du rat mâle (1973)
    Springer
    Cell & tissue research 143 (1973), S. 535-547 
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    ISSN: 1432-0878
    Keywords: Adenohypophysis ; Rat ; Mitoses, topographic distribution ; Influence of fixation ; Light microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les mitoses de l'adénohypophyse du rat mâle ont été examinées comparativement après fixation par perfusion et après fixation par immersion. Après fixation par perfusion la répartition topographique des mitoses dans le parenchyme est homogène, et l'index mitotique est de 1,85 pour 1 000 cellules. Après fixation par immersion, la densité des mitoses décroit de la périphérie vers le centre, et l'index mitotique n'est que de 0,80 mitoses pour 1 000 cellules. La lenteur de pénétration du fixateur pendant l'immersion est tenue pour principal responsable des différences observées. Elle entraîne une modification de l'aspect des mitoses, telle que plus de la moitié d'entre elles ne sont pas identifiables et échappent aux comptages.
    Notes: Summary The mitoses of the adenohypophysis in male rats have been observed comparatively after fixation by perfusion and fixation by immersion. After fixation by perfusion, the topographic distribution of mitoses throughout the parenchyma is homogenous and the mitotic index is 1.85 for 1 000 cells. After fixation by immersion, the density of the mitoses is decreasing from the periphery towards the center and the mitotic index is only 0.80 for 1 000 cells. The slow penetration of the fixative during fixation by immersion is considered to be the main cause in the differences observed. This slow action causes a modification in the aspect of the mitoses, and more than fifty percent of them cannot be identified and escape to the counts.
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    The ultrastructure of the accessory sex organs of the male rat (1973)
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    Cell & tissue research 144 (1973), S. 167-178 
    Details
    ISSN: 1432-0878
    Keywords: Prostate ; Rat ; Castration ; Alterations ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ventral, lateral and dorsal lobes of the rat prostate were studied 2, 3, 5, 7 and 21 days after castration. The major changes were a general reduction of the Golgi area and the RER. The cells became pale and contained less organelles compared with the normals. One of the most conspicuous changes were enormous autophagic vacuoles which were present already after 2 days, seemed to reach a numerical peak 3 days after castration and were seldom encountered after 7 days. Increased number of dense bodies were found within the same period. Lipid droplets were observed in the basal cytoplasm of the epithelial cells, especially in the ventral lobe. The basal cells showed the same involution as in the ordinary epithelium. In addition, macrophages were relatively numerous, and between the epithelial cells also lymphocytes were found. The results are discussed in relation to biochemical data on the different lobes.
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    The ultrastructure of the accessory sex organs of the male rat (1973)
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    Cell & tissue research 144 (1973), S. 179-189 
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    ISSN: 1432-0878
    Keywords: Seminal vesicles ; Coagulating Gland ; Rat ; Castration ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The seminal vesicles and the coagulating gland of the rat were studied 2, 3, 5, 7 and 21 days after castration. The major changes within the seminal vesicles were primarily formation of whorls of the rough endoplasmic reticulum (RER), followed by a general atrophy with a numerical reduction of the RER-profiles, and with general simplification of the cytoplasm due to loss of the organelles. It was a gradually reduction of secretion granules, diminution of the Golgi apparatus, formation of pigment bodies and autophagic vacuoles. Lipid droplets were observed in the basal cytoplasm of the epithelial cells. In the coagulating gland, similar changes occurred within the Golgi area and the lysosome complex. On the other hand, cisternae of the basal endoplasmic reticulum tended to persist in many cells. The similarity in response strongly suggests that the pathogenetic mechanisms are similar in both organs, i.e. atrophy due to deprivation of the androgenic stimulus. The deprivation of androgen gave rise to an inflammatory-like process with infiltration of lymphocytes and macrophages. The increased number of macrophages may indicate that they contribute in some way to the involution of the prostate by removing the material in the autophagic vacuoles.
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    Development and differentiation of fetal rat sensory ganglia and spinal cord segments in vitro (1973)
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    Cell & tissue research 144 (1973), S. 339-351 
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    ISSN: 1432-0878
    Keywords: Nervous system ; Tissue culture ; Sheath cells ; Sensory end-organs ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Fetal spinal ganglia and spinal cord segments with adhering spinal ganglia were explanted on collagen-coated coverslips. They were investigated with enzyme histochemical methods for the existence of hydrolases and dehydrogenases up to 54 days of cultivation. Alkaline phosphatase was located in arachnoid cells and in mantle cells (satellite cells). Butyrylcholinesterase and alpha-glycerophosphate-menadione-tetrazolium reductase were found in mantle cells. Acetylcholinesterase and indoxylesterase were active in the whole neuron; acid phosphatase and alpha-naphthylacetate esterase were restricted to the perikarya. During the process of cell differentiation in vitro alkaline phosphatase decreased in mantle cells. Acid phosphatase became diminished distinctly in spinal ganglion cells. The other neuronal enzymatic activities remained unaltered during the whole period of cultivation. Proliferated Schwann cells were conspicuous by their activity for butyrylcholinesterase. In newly formed myelin sheaths arylsulphatase was active. Lactate dehydrogenase was contained in the perineurium which had developed. Cultures of long duration could contain cytological formations which were reminiscent of sensory end-organs with respect to their enzyme patterns. The enzyme activities of nervous tissues in vitro in their approximation to the situation in situ are discussed.
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    Ultrastructure of the pseudohermaphrodite rat testis (1973)
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    Cell & tissue research 140 (1973), S. 473-479 
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    ISSN: 1432-0878
    Keywords: Testicular feminization ; Rat ; Leydig cells ; Sterility ; Androgens, Steroids ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The interstitial cells of the pseudohermaphrodite rat testis are both hypertrophic and hyperplastic. The cytoplasm is characterized by smooth endoplasmic reticulum which is abundant and variable in form. Mitochondria are numerous and large with tubular cristae and occasional inclusions. Structural features of the Leydig cells indicate potential for increased steroid synthesis. The presence of large numbers of mast cells in the intertubular area is confirmed. Small seminiferous tubules lack advanced germinal elements. Additional connective tissue and myoepithelial layers produce a thickening of the limiting membrane. Some myoepithelial cells are atypical with an electron translucent cytoplasm and nuclei with dense peripheral chromatin. No spermatogenic cells beyond the cap phase of the spermatid are observed. The cytoplasm of Sertoli cells contains large lipid droplets and degenerating germ cells.
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    Topochemischer Nachweis von carbonylhaltigen Verbindungen im Thymus (1973)
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    Cell & tissue research 142 (1973), S. 465-477 
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    ISSN: 1432-0878
    Keywords: Rabbit thymus ; Ketosteroids ; Granulated cells ; Histochemistry ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Topochemisch konnten im Kaninchenthymus Ketosteroide nachgewiesen werden, für deren Vorhandensein die chemische Analyse von Thymuslipidextrakten Hinweise ergeben hatte. Die Darstellung der Ketosteroide erfolgte mit der NAHD-Reaktion (Camber, 1949). Diese Befunde dürften als spezifisch gelten, da eine Verfälschung durch freie Gewebsaldehyde, Plasmalogene (Gomori, 1952) und Corticosteroide (Khanolkar et al., 1958) ausgeschlossen wurde. Mit Hilfe der Camber-Methode konnten Granula bestimmter Zellen des Kaninchenthymus selektiv dargestellt werden, die auf Grund morphologischer Kriterien in zwei Gruppen unterteilt wurden. Die Zellen liegen im gesamten Thymusparenchym sowie im Bindegewebe der Septen und der sogenannten „Kapsel“. Prädilektionsorte stellen die Umgebung der Hassallschen Körperchen, die Mark-Rinden-Grenze, der intra- und perivasale Raum sowie die subkapsuläre Zone dar. Beide Zellgruppen sind Sudan III-, PAS- und Eosin-positiv, besitzen eine ausgeprägte gelbgrüne Eigenfluoreszenz und können differentialdiagnostisch gegen Mastzellen abgegrenzt werden. Elektronenmikroskopisch zeigen beide Zellgruppen zahlreiche Übereinstimmungen mit Reifestadien eosinophiler Knochenmarkszellen.
    Notes: Summary Ketosteroids were demonstrated topochemically in the rabbit thymus following indications given by chemical analysis of thymus lipid extracts. They were revealed by means of the NAHD-reaction (Camber, 1949). The results are thought to be specific, because adulteration by free tissue aldehydes, plasmalogens (Gomori, 1952) and corticosteroids (Khanolkar et al., 1958) can be excluded. The Camber-method selectively reveals the presence of two groups of morphologically differentiable granules in specific rabbit thymus cells which are distributed throughout the entire thymic parenchyme as well as in the connective tissue of the septa and the in so-called “capsule”. They are mainly seen in the vicinity of Hassall's bodies, in the zone between medulla and cortex, the intra- and perivascular space and in the subcapsular space. Both cell groups are Sudan III-, PAS- and eosin-positive, show intensive yellow-green primary fluorescence and can be distinguished from mast cells by differential diagnosis. Electron microscopy reveals that both cell groups show many similarities with the maturation phase of bone marrow eosinophils.
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    Fine structure and innervation of the avian adrenal gland (1973)
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    Cell & tissue research 145 (1973), S. 389-416 
    Details
    ISSN: 1432-0878
    Keywords: Adrenal chromaffin cells ; Ganglion cells ; Avian adrenal gland ; Light- and electron microscopy ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of the adrenal gland of 15 bird species was investigated by light-, fluorescence-, and electron microscopy as well as by histochemical methods. 1. Adrenal Chromaffin Cells. Cells producing adrenaline (A) and noradrenaline (NA) may be distinguished from each other with the electron microscope by the different structure of their granules. In all species investigated A-cells prevailed. Granules in A-cells of Corvidae, partly those of the other passeriform birds as well, resemble granules from the pituitary pars intermedia because of their incomplete membrane and the low electron density of their contents. A-cells of some passeriform birds have mitochondria with specifically arranged cristae. Large cytosomes and inclusions of lipofuscin pigment are to be found in the gulls Larus ridibundus and Larus argentatus. The House Sparrow (Passer domesticus) and the Chaffinch (Fringilla coelebs) show vacuoles filled with a colloid-like substance, which are surrounded by adrenal chromaffin cells. 2. Ganglion Cells. The adrenal gland of birds is rich in ganglion cells. Two types can be distinguished. “Large” ganglion cells resemble completely sympathetic nerve cells as described in many vertebrates. “Small” ganglion cells have a low nucleus-cytoplasm-ratio. Some of them include granules of various structure and quantity. Whether they represent transitional stages to adrenal cells, interneurons, P-neurons or a heterogeneous population remains to be clarified.
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    URL: http://dx.doi.org/10.1007/BF00307164
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    Fine structure and innervation of the avian adrenal gland (1973)
    Springer
    Cell & tissue research 145 (1973), S. 417-442 
    Details
    ISSN: 1432-0878
    Keywords: Adrenal chromaffin cells ; Birds ; Cholinergic innervation ; Histochemistry ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary According to their ultrastructure and histochemistry three types of efferent nerve fibers can be distinguished in the bird's adrenal gland. The main part is made up of cholinergic fibers recognizable by a positive reaction for acetylcholinesterase and two specific populations of granules within the synaptic ending. Synaptic vesicles measuring 300 to 500 Å in diameter and dense-cored vesicles with a diameter of about 1 000 Å are discernible. In the periphery of the gland cholinergic axons for the innervation of adrenal cells form large bundles surrounded by a perineural sheath. The bundles cross the capsule and are situated within the adrenal chromaffin cords or at their periphery. Finally small groups of fibers enter a group of chromaffin cells which are surrounded by a basal lamina and which consist of about a dozen or more cells producing adrenaline and noradrenaline. Synaptic endings occur, above all in passeriform species, in the center of a chromaffin cell complex. They are either attached to the innervated cells or their dendrite-like processes, or embedded into the cells, or connected to short spines of the innervated cells. Synaptic and dense-cored vesicles leave the bouton by exocytosis. One synaptic terminal may innervate up to three A- or NA-cells. The existence of different types of synapses for A- and NA-cells cannot be excluded.
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    URL: http://dx.doi.org/10.1007/BF00307165
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    Morphometric classification of the neurosecretory granules in the rat pars nervosa (1973)
    Springer
    Cell & tissue research 146 (1973), S. 463-471 
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    ISSN: 1432-0878
    Keywords: Neurosecretory granule ; Pars nervosa ; Rat ; Morphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The distribution of the diameters of the neurosecretory granules in the rat pars nervosa (measured from electron micrographs taken at 40 000 × ) was compared among axons by nonparametric statistical methods and the axons were classified into five groups with median granule diameters of 143, 155, 167, 180 and 193 nm. We suggested that these five axon types carried different secretory substances contained in the pars nervosa.
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    URL: http://dx.doi.org/10.1007/BF02347176
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    Elektronenmikroskopische und histochemische Untersuchungen zur Funktion der Branchialdrüse (Parabranchialdrüse) der Cephalopoda (1973)
    Springer
    Cell & tissue research 139 (1973), S. 253-269 
    Details
    ISSN: 1432-0878
    Keywords: Branchial gland ; Cephalopoda ; Fine structure ; Hemocyanin ; Histochemistry ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Licht- und elektronenmikroskopische Untersuchungen an der Branchialdrüse verschiedener Cephalopoden (Sepia officinalis, Octopus vulgaris, Loligo vulgaris, Eledone moschata) zeigen, daß das Drüsengewebe des stark vaskularisierten Organs aus einem sekretorisch aktiven Zelltypus mit ausgeprägtem endoplasmatischen Retikulum besteht. In den Zisternen des endoplasmatischen Retikulums lassen sich granuläre und ringförmige Strukturen (Durchmesser: 45–65 Å und 170 Å) nachweisen, die in Größe und Gestalt mit den Hämocyanin-Einheiten in den Gefäßen und Lakunen übereinstimmen und durch randlichen Zerfall der Zellen in den Blutraum auszuwandern scheinen. Die histochemischen Untersuchungen ergeben eine positive Reaktion für Monoaminoxydase, aber vergleichsweise geringe Phosphatase- und Dehydrogenase-Aktivitäten. Diese Befunde sowie der histochemisch nachgewiesene hohe Kupfergehalt des Drüsengewebes sprechen für eine hämopoetische, d.h. hämocyaninbildende Funktion der Kiemendrüse.
    Notes: Summary Light and electron microscopic investigations on the branchial gland of different Cephalopoda (Sepia officinalis, Octopus vulgaris, Loligo vulgaris, Eledone moschata) show that the gland tissue, strongly vascularized, consists of an actively secreting cell type with a remarkable endoplasmatic reticulum. In the cisternae of the endoplasmatic reticulum granular and ring-shaped structures can be identified (diameter: 45–65 Å and 170 Å) which correspond in size and shape with the hemocyanin units in the vessels and lacunae and which seem to emigrate into the blood space caused by the peripheral decay of the cells. Histochemical investigations show a positive reaction for monoaminoxidase, but comparatively low phosphatase and dehydrogenase activities. These results, and also the high content of histochemically identified copper in the gland tissue, seem to indicate a hemopoetic, i.e. hemocyanin-forming function for the branchial gland.
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    URL: http://dx.doi.org/10.1007/BF00306525
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    Ultrastructure of the rat neural lobe during recovery from hypertonic saline treatment (1973)
    Springer
    Cell & tissue research 137 (1973), S. 361-374 
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    ISSN: 1432-0878
    Keywords: Neurohypophysis ; Rat ; Saline-treatment ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Neural lobes from rats which had been allowed to drink hypertonic saline for five days were examined electron microscopically and by bioassay of oxytocin levels. The profound changes in the ultrastructure were examined and the reversal of these changes in morphology was followed until the hormone levels returned to normal. The recovery of the gland as measured by the two parameters of structure and hormone content indicated that the morphological recovery apparently preceded the hormone level recovery, a factor which might be explained by continued release of hormone during the period of recovery.
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    URL: http://dx.doi.org/10.1007/BF00307209
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    The distribution of monoamines in the tel-, di-and mesencephalon of Xenopus laevis tadpoles, with special reference to the hypothalamo-hypophysial system (1973)
    Springer
    Cell & tissue research 137 (1973), S. 521-540 
    Details
    ISSN: 1432-0878
    Keywords: Brain ; Hypothalamo-hypophysial system ; Xenopus laevis, tadpoles ; Monoamines ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In tadpoles of Xenopus laevis the histochemical distribution of monoamines in the tel-, di- and mesencephalon was studied. Catecholamines are present in some mitral cells of the olfactory bulb, the neurons of the preoptic recess organ (PRO), the neurons of the paraventricular organ (PVO) and cells in the vicinity of the PVO, namely the so-called PVO-accompanying cells, the nucleus infundibularis dorsalis (NID) and in the nucleus reticularis mesencephali (NRM). The PRO, PVO, and NID are composed of liquor-contacting neurons. With the Falck-technique, in the PVO and NID two types of fluorescent cells were observed: green cells, containing a catecholamine and yellow-orange cells, presumably containing a tryptamine. Tryptaminergic neurons occur in the NRM and in the area of the raphe nucleus. Extensive tracts of fluorescent fibres originating in the hindbrain ascend to the area praeoptica and the septum, striatum and epistriatum of the telencephalon. Also, fibre connections could be traced from the PVO to the area praeoptica, to the thalamus and to the nucleus ventromedialis tuberis. The PVO and/or NID give rise to a catecholaminergic tract running towards the hypophysis. Fibres of this tract partly terminate in the developing median eminence and partly in the pars intermedia. Experimental data indicate that the aminergic fibres in the pars intermedia exert an inhibitory influence on MSH-release.
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    URL: http://dx.doi.org/10.1007/BF00307228
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    Unique sensory endings in rat muscle spindles (1973)
    Springer
    Cell & tissue research 136 (1973), S. 511-520 
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    ISSN: 1432-0878
    Keywords: Muscle spindle ; Sensory ending ; Rat ; Development ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A fine structural study of sternothyroid muscle spindles of young adult rat demonstrates the rare occurrence of unique nerve endings. These endings are situated in the juxta-equatorial region of nuclear-bag fibers, adjacent to the annulo-spiral sensory endings. They consist of a bundle of terminal axons less than 0.3 μ in diameter and appear to be disposed nearly longitudinally to the axis of the intrafusal fibers. Whereas, the annulo-spiral endings consist of a single axon, coiling around the intrafusal fibers. Transverse sections of these muscle spindles reveal these unique endings scattered around the muscle fibers, fitting into depressions on their surface. The innermost axons directly face the muscle surface and are separated by a narrow gap less than 200 Å in width. No Schwann cell process appears to be associated with these endings. From their unique multi-axonal composition, these endings are termed “bundled endings”. Investigations of developing muscle spindles show the occasional presence of a similar multi-axonal composition of sensory endings in perinatal rats. It is suggested that “bundled endings” are sensory in nature, carrying an immature feature over to adult life.
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    URL: http://dx.doi.org/10.1007/BF00307367
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    Electron microscopy of dental enamel: Analysis of crystal lattice images (1973)
    Springer
    Cell & tissue research 137 (1973), S. 271-280 
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    ISSN: 1432-0878
    Keywords: Dental enamel ; Rat ; Ultrastructure ; Crystallography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Thin sections of rat incisor enamel were studied with the electron microscope. Fringe patterns having repeat periods in the range 3.1–8.2 Å were seen in individual enamel crystals. These images were interpreted as representing the resolution of corresponding planes in the hydroxyapatite crystal lattice. The lattice spacings and interplanar angles were identified by comparing the observations with available data derived from X-ray diffraction analysis.
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    URL: http://dx.doi.org/10.1007/BF00307434
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    Cholinesterase-containing nerve fibres on blood vessels in lungs of some laboratory mammals (1973)
    Springer
    Cell & tissue research 140 (1973), S. 91-100 
    Details
    ISSN: 1432-0878
    Keywords: Pulmonary and bronchial vessels ; Laboratory mammals ; Cholinesterase-containing nerve fibres ; Species differences ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Distribution of cholinesterase-containing nerve fibres on blood vessels in the lungs of rats, mice, rabbits, guinea pigs, cats, dogs, and rhesus monkeys has been studied with the thiocholine method modified by Coupland and Holmes and with the “direct-coloring” method according to Karnovsky and Roots. The presence of acetylcholinesterase positive nerve fibres on the pulmonary arteries has been established only in four species of the studied animals, namely the cat, the dog, the rhesus monkey and the rabbit. These nerves form d distinct plexus on the border between the media and adventitia. In the thick walled perihilar branches of the pulmonary artery of the rabbit the nerve fibres penetrate—as a rule—into the outer half of the media. Despite many times repeated experiments and careful investigations no nerve fibres have been found on the intrapulmonary branches of the blood vessels in the lungs of rats, mice, and guinea pigs. In the walls of the pulmonary veins, with the exception of the pulmonary veins in the rat and the mouse, cholinesterase fibres have been identified only seldom. Acetylcholinesterase nerve fibres in medio-adventitial localization have also been found in the walls of bronchial arterioles, this being the case in all the species under study. Bronchial veins do not exhibit any nerve fibres. The distribution of the acetylcholinesterase-containing nerve fibres on the pulmonary arteries is different from species to species.
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    URL: http://dx.doi.org/10.1007/BF00307060
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    Aspects histologique, histochimique et ultrastructural des péricaryones neurosécréteurs latéraux du protocérébron de Locusta migratoria migratorioides (Insecte: Orthoptère) (1973)
    Springer
    Cell & tissue research 141 (1973), S. 75-91 
    Details
    ISSN: 1432-0878
    Keywords: Neurosecretory cells ; Lateral ; Locust ; Histochemistry ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé L'étude histologique, histochimique et ultrastructurale des péricaryones neurosécréteurs latéraux de Locusta précise leur nombre et leur localisation. Elle révèle que le neurosécrétat latéral est semblable morphologiquement (forme et diamètre des granules élémentaires) au neurosécrétat A de la pars intercerebralis. Cependant, il en diffère histochimiquement par la présence d'une composante glucidique. Elle confirme l'hypothèse émise pour les péricaryones neurosécréteurs de la pars intercerebralis (Girardie et Girardie, 1967), de l'unicité cellulaire chez Locusta des types A et B selon la nomenclature de Johansson (1958). Elle suggère que les péricaryones latéraux pourraient être des cellules neurosécrétrices très actives.
    Notes: Summary The number (8 to 12) and position of the lateral neurosecretory cells have been established in Locusta by a histological, histochemical and ultrastructural study. The neurosecretory material of the lateral cells contains glycoprotein and is, in this way, histochemically different from medial A cells neurosecretory material. However, the morphological aspect (shape, diameter) of elementary dense core vesicles in the lateral and medial A neurosecretory cells is similar. This study confirms the idea (Girardie and Girardie, 1967) that, in Locusta, A cells and B cells (Johansson, 1958) are in fact two physiological aspects of one cell type. It also suggests that the lateral cells could be very active neurosecretory cells.
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    URL: http://dx.doi.org/10.1007/BF00307397
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    A light and electron microscopic study of the pre- and postnatal development and secretory differentiation of the pars tuberalis of the rat hypophysis (1973)
    Springer
    Cell & tissue research 142 (1973), S. 347-365 
    Details
    ISSN: 1432-0878
    Keywords: Pars tuberalis ; Rat ; Development ; Secretion ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The development of the pars tuberalis was studied in the rat fetus from 13 days of gestation to 6 weeks after birth. After the closure of Rathke's pouch, the pars tuberalis anlage is clearly distinguishable from the anlagen of the partes intermedia and distalis. It comprises the entire basal portion of the adenohypophysial anlage; the limit between the anlagen of the pars tuberalis and the pars distalis is defined by Atwell's recess, i.e. the pathway taken by the hypophysial vessels coming from the vascular plexus of the median eminence. At 14 days the pars tuberalis cells are characterized by the presence of glycogen which persists in the adult. Their secretory differentiation (elaboration of granules with a diameter of 100–120 nm) is obvious at 15 days of gestation. It therefore, clearly precedes that of the other hypophysial cell types. Its functional differentiation takes place well before its adhesion to the primary vascular plexus of the portal system. Cystic formations appear just before birth in the pars tuberalis, much later than those of the pars distalis. These observations on the development of the pars tuberalis, together with previous observations on the adult PT in various species, showing that the specific glandular cells of the pars tuberalis are cytologically different from all known adenohypophysial cell types, seem to indicate a specific endocrine function of this lobe.
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    URL: http://dx.doi.org/10.1007/BF00307357
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    Parasympathetic and sympathetic postganglionic synapses in ureterovesical autonomic pathways (1973)
    Springer
    Cell & tissue research 146 (1973), S. 147-154 
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    ISSN: 1432-0878
    Keywords: Peripheral autonomic innervation ; Ureterovesical ganglia ; Parasympathetic postganglionic synapse ; Sympathetic postganglionic synapse ; Denervated bladder ; Acetylcholinesterase ; Catecholamine ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Histochemical techniques for acetylcholinesterase and catecholamine show that ureterovesical ganglia of both cat and dog contain dense intraganglionic cholinergic and adrenergic plexuses. Ramifications of both plexuses surround most cholinergic and adrenergic ganglion cell bodies as pericellular synaptic plexuses. Similar pericellular plexuses exist around extraganglionic cholinergic and adrenergic ganglion cells. Both adrenergic and cholinergic synaptic fibers persist in denervated pregnaglionic nerve-free specimens, indicating that cholinergic synaptic fibers are postganglionic parasympathetic in nature. The presence of adrenergic (postganglionic sympathetic) and postganglionic parasympathetic synapses around cell bodies in ureterovesical ganglia provides a morphologic basis for the sympathoinhibitory and muscarinic parasympatho-excitatory phenomena described in these ganglia.
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    URL: http://dx.doi.org/10.1007/BF00307343
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    Electron microscopic study of the substantia nigra and the strio-nigral projection in the rat (1973)
    Springer
    Cell & tissue research 146 (1973), S. 207-221 
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    ISSN: 1432-0878
    Keywords: Substantia nigra ; Rat ; Six bouton types ; Strio-nigral projection ; Bouton degeneration ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The normal ultrastructure of rat substantia nigra was investigated. Special attention was paid to the different types of boutons, and the mode of termination of the striatonigral connection was examined. Two different types of nigra neurons with deep nuclear membrane indentations were observed. The synaptic organization of rat substantia nigra is very complex. Six types of boutons, with many characteristics, could be differentiated: pleomorphicvesicle boutons (40%), elongated-vesicle boutons (10%), small-round-vesicle boutons (10%), large-round-vesicle boutons (20%), “clear-terminal” (15%) and dense-core-vesicle boutons (about 5%). Vesicle-containing dendrites were observed entering dendro-dendritic synapses. One to four days after large unilateral striatal lesions were made, a great number of degenerating boutons were seen in the ipsilateral substantia nigra, while the contra-lateral substantia nigra was entirely free of degeneration. The newly defined pleomorphic-vesicle boutons were found almost exclusively in the process of degeneration. The neuronal origin of the other bouton types is discussed.
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    URL: http://dx.doi.org/10.1007/BF00307347
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