Library

feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 13 (1969), S. 43-55 
    ISSN: 1432-0533
    Keywords: Subacute Dementia ; Jakob-Creutzfeldt Disease ; Brain Biopsy ; Histochemistry ; Electron Microscopy ; Basement Membrane ; Astroglia Dilatation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die elektronenoptische und histochemische Untersuchung von Biopsiematerial bei zwei Fällen subakuter Demenz ergab Neurone mit reichlich Lipofuscin-Depots sowie erhöhter saurer Phosphatase-Aktivität. Obwohl diese Veränderungen eine Nervenzellerkrankung anzeigen dürften, werden sie wegen ihrer Ähnlichkeit sowie wegen des Vorliegens anderer, spezifischerer Zellveränderungen als Sekundärphänomene gedeutet. Im ersten Fall wird als primäre Läsion eine Verdickung der Basalmembran der Gefäße, im zweiten Fall eine Astrogliaschwellung angenommen. Da diese Strukturen wichtige Transportfunktionen haben dürften, könnten diese Anomalien leicht die neuronale Versorgung stören und dadurch die neuronalen Läsionen verursachen. Die Bedeutung des Glykogens in diesen Strukturen wird diskutiert.
    Notes: Summary The electron microscopic and histochemical findings in biopsies of two cases of subacute dementia have revealed neurons containing numerous lipofuscin bodies and increased acid phosphatase. Although these changes are considered to indicate neuron disease, they are believed to represent a secondary process because of their similarity and because other more distinctive cell alterations are present. In the first case, the primary abnormality is believed to be thickening of the vascular basement membrane, while in the second case, astroglial dilatation is considered a primary change. Since these structures appear to have important transport functions, these abnormalities could easily impair the nutrient supply to neurons and, in this way, produce the neuronal alteration. The significance of glycogen in these tissues is discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 12 (1969), S. 173-182 
    ISSN: 1432-0533
    Keywords: Sodium Deposits ; Electron Microscopy ; Perfusion with Hydroxyadipaldehyde-Antimonate ; Extracellular Space
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Eine Modifikation der Methode zur ultrastrukturellen Darstellung von Natrium wird beschrieben, die eine Perfusion mit leicht alkalischer Mischung von Hydroxydipaldehyd, Phosphatpuffer und Kalium-Pyro-Antimonat verwendet. Im normalen Gehirn werden keine Natrium-Deposite angetroffen. Das spricht dafür, daß im Gehirn keine intraoder extracelluläre Konzentration über 150 mM vorliegt. Bei Vorliegen hoher NaCl-Konzentration sieht man ein großes, dichtes Präcipitat, das nach direkter Injektion in den extracellulären Räumen, Neuronen und Astrocyten lokalisiert werden kann. Im Mark der vergifteten Ratten findet sich ähnlich wie nach direkter Natrium-Injektion ein diskretes, gleichfalls als Natrium aufgefaßtes Präcipitat an der Oberfläche von Oligodendrogliazellen, aber nicht innerhalb dieser Zellen. Ein elektronendichtes Deposit unklarer Herkunft findet sich in den Myelinspalten, die nach akuter TET-Vergiftung auftreten. Der Wechsel in Charakter und Lokalisation dieser elektronendichten Partikel mahnt zur Vorsicht in ihrer Interpretation bei histochemischen Untersuchungsmethoden.
    Notes: Summary A modification of the technique for the ultrastructural demonstration of sodium is described which involves a perfusion with a slightly alkaline mixture of hydroxyadipaldehyde, phosphate buffer and potassium pyroantimonate. No sodium deposits are found in normal brain indicating that no intra or extracellular concentration exceeding 150 mM is present in the brain. In the presence of high concentration of NaCl, a large dense precipitate can be seen which after a direct injection can be localized to extracellular spaces, neurons and astrocytes. In the white matter of tin poisoned rats, as well as after the direct injection of sodium, a discrete precipitate, also believed to represent sodium, is noted at the surface of oligodendrocytes but not within these cells. An electron dense deposit of dubious origin is present in the myelin clefts which occur as a result of acute triethyltin intoxication. The variations in the character and localization of these electron dense particles emphasize the caution which is required in their interpretation following histochemical procedures.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 15 (1970), S. 240-250 
    ISSN: 1432-0533
    Keywords: Ependymoma ; Electron Microscopy ; Secretory Granules ; Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ein unikales Ependymom des Filum terminale mit intracytoplas-matischen Sekretgranula wurde licht- und elektronenmikroskopisch nachgewiesen. Auffallende strukturelle und histochemische Änlichkeiten bestehen zwischen den Sekretionsprodukten des Tumors und denen im sekretorischen System des Endabschnittes des Rückenmarks bei Fischen. Die Funktion und der Wirkungsort des Sekretionsproduktes sind unbekannt.
    Notes: Summary An unique ependymoma of the filum terminale with intracytoplasmic secretory granules has been identified by light and electron microscopy. A striking structural and histochemical similarity exists between the tumor secretory product and that found in the secretory system present in the terminal portion of the spinal cord of the fish. The function and site of action of the secretory product is unknown.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 22 (1972), S. 264-268 
    ISSN: 1432-0533
    Keywords: Subacute Dementia ; Neuroaxonal Dystrophy ; Demyelination ; Gliosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case has been reported in which neuroaxonal dystrophy is present in a patient who had a clinical syndrome compatible with subacute dementia. These findings, accompanied by demyelination and gliosis were restricted to the rostral half of the corpus callosum and the cortical spinal tract. The interrelationship between neuroaxonal dystrophy and dementia is discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Histochemistry and cell biology 18 (1969), S. 281-292 
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The histochemical and cytochemical localization of end product from the Wachstein-Meisel reaction was examined in transverse frozen sections of rat ischiatic nerve and spinal nerve roots. A variety of fixatives, substrates, and inhibitors were used at varying pH. Following glutaraldehyde fixation, nucleoside phosphatase activity was noted in the axon-Schwann cell interface of both unmyelinated and myelinated nerve fibers. The presence of this enzymatic activity at this strategic location in the nerve fiber complex attests to the importance of this space as a metabolically active site. Additional deposits of end product occurred on neurofilaments of myelinated and unmyelinated axons and were observed as diffuse axonal stains by light microscopy. These precipitates had a predilection for tissue fixed in formalin or hydroxyadipaldehyde and were relatively more prominent following acidic incubations. The resemblance between these deposits and spurious axonal “acid phosphatase” precipitates was discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 66 (1965), S. 352-364 
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Following perfusion fixation of rat brain with hydroxyadipaldehyde a greater extracellular space can be observed in electron micrographs than in similar studies of tissue fixed with glutaraldehyde. This increased space cannot be reduced to normal size by a variation of the osmolality of the perfusion medium, by an alteration in the height of the perfusion column, or by the use of a physiological buffer in the perfusion medium. Therefore the size of the extracellular compartment is believed to be due to a chemical effect of the fixative compound upon cell membranes and/or intracellular protein. The possible relationship of this larger space to the extracellular space of living animals is discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 66 (1965), S. 690-700 
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary When tissue slices or small blocks of unfixed rat cerebrum are incubated in various anisotonic physiological media, distinctive morphological changes are induced in glial cells, neurons, and endothelial cells. The variation in observed cellular swelling and shrinkage may be related to differences in ionic content of the cytoplasm of these cells. When HAA, glutal, and osmium tetroxide fixed tissue is incubated in this manner, only the cerebrum fixed in HAA responds to osmotic inequilibrium in a manner similar to unfixed tissue. Although HAA does not “fix“ tissues very well, the permeability of plasma membranes in the brain appears to be less altered by HAA than by glutal or osmium tetroxide. The relationship of these findings to a demonstration of the extracellular space in HAA fixed tissues is discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 99 (1969), S. 1-12 
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An electron microscopic analysis was performed on biopsies of the infundibulum from humans undergoing hypophysectomy. Two types of nerve fibers can be distinguished by their dense core vesicles, both of which terminate in the perivascular space of small vessels within the infundibulum. Type A fibers contain dense core vesicles measuring 1,500–3,000 Å in diameter; type B fibers contain dense core vesicles measuring 500–1,000 Å in diameter. Smaller clear vesicles (200–500 Å) are found within the nerve endings in an inverse proportion to dense core vesicles. Herring bodies contain either type A or type B dense core vesicles, but frequently are filled with non-neurosecretory elements (mitochondria, dense bodies) which can also be found in nerve endings. These observations support other evidence that two types of neural control are involved in anterior pituitary regulation, but a more precise correlation between structure and function is not possible. The vascular bed of the neural infundibulum is characterized by blood vessels whose structure ranks them with venules. Short amuscular capillary segments show a cuff formed by pituicytes reminiscent of that formed by astrocytes around cerebral capillaries.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1432-0878
    Keywords: Sodium ; Pyroantimonate method ; Brain ; Area postrema
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Following an intracisternal injection of sodium chloride, sodium has been localized in paraventricular and subpial tissues of the posterior fossa by means of the pyroantimonate histochemical technique, with the use of a buffered pyroantimonate medium. The electron dense deposit is present in these tissues within 4 minutes after injection and is found only extracellularly except in the area postrema. This finding supports the contention that sodium is chiefly an extracellular ion and that the cerebrospinal fluid and the extracellular fluid are in equilibrium at these sites. In the area postrema, an intracellular precipitate is noted in the vesicular structures of the “atypical astrocytes” of this structure and in pinocytic vesicles of the large blood vessels. The intraglial localization of sodium in the area postrema is discussed in relation to a possible function of this structure as a regulator of cerebrospinal fluid ionic content.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1432-0878
    Keywords: Area postrema ; Peroxidase penetration ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Scanning electron microscopy and the penetration of horseradish peroxidase, especially from the ventricular surface, has been utilized to determine the distinctive properties of the posterior portion of the area postrema. This part of the organ is characterized by a non-ciliated surface composed of flattened cells, which appear less permeable to cisternally injected peroxidase than the ciliated ependymal cells covering the anterior part of the area postrema. However, more diffuse and rapid penetration of peroxidase into the posterior region is achieved by way of the perivascular spaces which appear in direct communication with the CSF. No such filling is noted in the anterior area postrema. The posterior portion also contains cells which appear to be rapidly penetrated by horseradish peroxidase and which may be important as a sensing mechanism. The chief distinction of the anterior part of the area postrema appears to be the presence of vascular connections with the choroid plexus.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...