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  • 1
    ISSN: 1432-0878
    Keywords: Hypothalamus ; Mouse ; Arcuate neurons ; Nucleolus-like bodies ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The arcuate nucleus of untreated (control) and castrated adult mice was studied with the electron microscope. Nucleolus-like bodies (NLB) were found in the cytoplasm and occasionally in the dendrites of arcuate neurons. NLB were spherical or ovoid, 0.7–1.5µm in diameter; they were composed of granules 100–150 Å and 200 Å in diameter, and filaments ∼70 Å in diameter. NLB were frequently associated with free ribosomes and cisternae of the rough endoplasmic reticulum. Light microscopic studies with basic dyes and enzymatic digestions showed that these bodies contained some RNA. There was no significant change in the number of NLB in castrated animals.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0878
    Keywords: Hypophysis ; Rat, male ; Implants ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Male rats were divided in two experimental groups. In group I two partes distales of the hypophysis were grafted under the kidney capsule and in group II two complete hypophyses were transplanted. Animals were killed 5 to 22 months after the operation. The grafted tissue was excised and processed for light and electron microscopy. The transplanted pars distalis tissue showed a well developed vascularisation in contrast to the pars intermedia which appeared poorly vascularised. Six different cell types were observed in grafted pars distalis. They correspond to the different types of cells found in the rat pars distalis “in situ”. The predominant cell type in the graft displayed all the morphological characteristics of stimulated prolactotrophs. Pars intermedia cells appeared hypertrophied resembling the MSH cells under stimulation. Two types of syncytial formations were frequently seen. One of them appeared to originate from prolactotrophs and the other from MSH cells. Bodian impregnated fibres and structures resembling either growth cones of axons or typical nerve endings were observed in the pars intermedia of long-term grafted hypophyses. Pituicytes remained as isolated clusters of cells. Canaliculi lined by two or more pituicytes were observed. Saccular formations resembling the hypophyseal cleft appeared in all grafts studied. The present findings suggest that in the male rat the chronically grafted pituitary gland is capable of synthesising most or all the hormones which are known to be produced by the gland “in situ”. Furthermore, prolactin and MSH seem to be the predominant secretion of the transplanted pituitary.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 165 (1969), S. 229-235 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The vascular endothelia of the aortic, iliac and kidney arteries of the toad Bufo arenarumH. and the frog Leptodactylus chaquensis were studied with the electron microscope. The shape and size of the endothelial cells appear to depend upon whether the internal elastic membrane is stretched or contracted. These cells present the following characteristics: (1) an elongated and folded nucleus, (2) large bundles of oriented filaments, (3) acid phosphatase-positive micropinocytotic vesicles, (4) small, dense, spherical granules surrounded by a single membrane. These cytoplasmic granules, also studied by histochemical techniques, are of unknown nature and function.
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  • 4
    ISSN: 1432-0878
    Keywords: Arcuate neurons ; Vinblastine injection ; Median eminence, rat ; Ultra-structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructural effects of vinblastine on the arcuate neurons and median eminence were studied in the rat. The animals were stereotaxically injected with solutions of 1 mM and 5 mM vinblastine into the median eminence and killed 3, 8 and 21 days after injection. Eight days after injection of 1 mM vinblastine the neurons of the arcuate nucleus showed marked changes. The Golgi complex was more distinct and considerable increases in the populations of dense bodies, granulated vesicles and coated vesicles were observed. Changes in the axo-somatic synapses and degenerating fibers in the surrounding neuropil were also characteristic of the experimental animals. The outer zone of the median eminence showed numerous degenerated nerve fibers and fibers engulfed by glial cell processes. Eight days after injection of 5 mM vinblastine arcuate neurons and median eminence showed similar changes, but quantitative differences were noted. A striking ultrastructural recovery of the arcuate neurons and axons in the outer zone of the median eminence was observed 21 days after injection of either 1 mM or 5 mM vinblastine. The results are discussed in relation to axoplasmic transport and axonal degeneration.
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  • 5
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The region of the reticular giganto-cellular nucleus, perfused with formalin and postfixed in osmium tetroxide, was studied with histochemical and electron microscopic techniques. The perikarya of the neurons have two zones. The peripheral cytoplasm contains Nissl bodies, mitochondria, and free RNP particles. The juxtanuclear cytoplasm contains the Golgi complex, mitochondria, RNP particles and dense bodies. The nucleus is indented and has a prominent nucleolus and a paranucleolar body. Dense bodies are found along the axon and dendrites as well. Three different types of synapses are described and two types of synaptic vesicles (spherical and ellipsoidal) are shown. The capillary endothelium shows microvilli and marginal flaps. The endothelial cytoplasm contains vacuoles, micropinocytotic vesicles, and a few dense bodies. Processes of pericapillary cells, surrounded by a basement membrane, also contain dense bodies. The dense bodies found in the neurons and endothelial cells show acid phosphatase activity. On the basis of their morphology and their enzymatic activity these bodies are identified as lysosomes.
    Type of Medium: Electronic Resource
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