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  • 1
    Electronic Resource
    Electronic Resource
    Visas for scientific congresses (1988)
    [s.l.] : Nature Publishing Group
    Nature 331 (1988), S. 204-204 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] sir—In the summer of 1986, the secretary general of the European Congress of Pathology, Dr J. Stejskal, invited me to take part in the congress, to be held in Prague in September 1987. He assured me that my being an Israeli would pose no problems in obtaining a Czechoslovak visa. I therefore ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/331204a0
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  • 2
    Electronic Resource
    Electronic Resource
    Histochemical study of the nature of the asymmetry of cell membranes (1967)
    Springer
    Histochemistry and cell biology 9 (1967), S. 1-12 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effect of pretreatment with M/1 KCNS on the histochemical demonstration of 19 different enzymatic activities was studied in cryostat sections. Reversal by KCl of the KCNS inhibitory effect which had been obtained with most enzymes was investigated and the inhibition and restoration of enzyme activities were compared with the effects of M/2 CaCl2 and of the sequence CaCl2 followed by KCl. With most enzymes the CNS ion had a similar effect to the Ca ion and in some instances the effects were similarly reversible, whereas with some enzymes reversal of the inhibition differed quantitatively after KCNS and CaCl2 inhibition. The findings are considered to indicate that: 1. the cation-sensitive and the anion-sensitive components of membranes are situated on the opposing sides of membranes; 2. almost all the enzymes studied histochemically in the present work are situated on the cation-sensitive surface of membranes; 3. the various cell membranes differ in their reaction to reversal of inhibition by ions and presumably, therefore, in constitution, but the nature of the difference is not clear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00281803
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of phase transitions on enzymes bound to different cellular membranes (1968)
    Springer
    Histochemistry and cell biology 15 (1968), S. 251-260 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In unfixed cryostat sections enzymes attached to various cellular membranes differ in their sensitivity to the inhibitory effects of Ca and CNS ions. Similar differences between enzymes related to various membranes were also noted in the possibility of reversing the inhibition of NaCl treatment and in the effects of oxygen in rendering the inhibition irreversible. Evidence was adduced to show that some of the previous data on reversibility of ionic inhibition of membrane bound enzymes were due to an inadvertently introduced step of drying. The effect of drying was not apparent in NaCl-treated sections. In CaCl2- and KCNS-treated sections the effect of drying was due to a high concentration of the salts prevailing during evaporation and to atmospheric oxygen. A possible effect of denaturation not associated with oxidation could not be excluded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305889
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  • 4
    Electronic Resource
    Electronic Resource
    Correlative histochemical and morphological study on the maturation of sensory ganglion cells in the rat (1970)
    Springer
    Histochemistry and cell biology 22 (1970), S. 100-108 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In neonatal rats the sensory ganglion cells are uniform in size and in their stainability with hematoxylin and eosin. At this stage the cells differ, however, in the intensity of staining for RNA and for various enzyme activities. With maturation the ganglion cells differentiate into “light” (mostly large) cells, and “dark” (mostly small) cells. The differentiation is accompanied by changes in intensity of various enzyme activities. In sections stained for acid phosphatases and acetylcholine esterase, maturation was associated with a higher activity in the small than in the large cells, whereas with thiamine pyrophosphatase it was associated with a higher activity in the large than in the small neurones. With non-specific cholinesterase, maturation of all cells was accompanied by loss of activity in perikarya and increased activity in axons and satellite cells. With monoamine oxidase, the changes during maturation differed in the trigeminal from the spinal ganglion cells. The findings indicate that the difference between small and large cells might have a functional significance, the nature of which is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303621
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  • 5
    Electronic Resource
    Electronic Resource
    A fluorescent histochemical procedure for gamma-aminobutyric acid (1971)
    Springer
    Histochemistry and cell biology 28 (1971), S. 118-130 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Gamma aminobutyric acid (GABA) was selectively demonstrated in slide tests by the production of a fluorescent compound with ninhydrin in a non-aqueous medium (octanol). Thirty other related pure compounds either failed to yield a fluorescent product or produced distinguishable fluorescent products. The reaction was tested on sections of several organs of normal mice, mice with experimentally increased GABA levels and mice injected topically with GABA. In normal mice and in animals injected with AOAA intense GABA fluorescence was found in the brain in groups of cells in the cerebellum, in the hippocampus, and in some mesencephalic and hypothalamic nuclei. In most places flourescent lines surrounded perikarya. Fluorescence of lesser intensity was found around some cortical cells. Intense fluorescence, more marked after AOAA injection, but partly “masked” by autofluorescence, was found in erythrocytes, leptomeninges, choroid plexus and retina. Outside the brain GABA-fluorescence was found in some cells of the adrenal medulla and in isolated cells of sensory ganglia. After intraperitoneal GABA injection GABA fluorescence was noted in Kupffer cells, in renal tubular cells and in the adrenal. Topical injections of GABA resulted in non-specific uptake by glial and also neuronal cells of the brain and presumably in the retina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279856
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  • 6
    Electronic Resource
    Electronic Resource
    The relation of various enzymes to cellular membranes (1966)
    Springer
    Histochemistry and cell biology 7 (1966), S. 105-115 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effect of pretreatment by M/1 NaCl or M/2 CaCl2 on 11 enzymatic activities was studied in cryostat sections. The various enzymes were found to differ in their-reactions to these ions. In addition, different enzymes varied in their sensitivity to various noxious agents after these two pretreatments. The results are interpreted in terms of phase reversals of emulsions that can be expected to form as the result of an interaction of membrane anionic lipids and ions, with formation of oil in water (o/w) systems with monovalent cations and water in oil (w/o) systems with divalent cations. This assumption leads to the following interpretation of the data: in most instances the sensitivity of enzymes which are probably situated in the hydrophilic layer in a o/w system was greater to noxious agents presumed to act in the aqueous layer; the sensitivity of those enzymes which are probably situated in the hydrophobic layer was greater to noxious agents which are presumed to act in the less hydrophilic layer when in a w/o system. Some discrepancies were noted and suggestions for explaining them were proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309716
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  • 7
    Electronic Resource
    Electronic Resource
    Study of the nature of lysosomes and of their acid phosphatase (1964)
    Springer
    Cell & tissue research 65 (1964), S. 1-9 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Treatment with M/2 CaCl2 or fresh frozen sections of various organs of mice inhibits the subsequent histochemical demonstration of acid phosphatase by various procedures. This inhibition can be reversed by treatment with M/I NaCl. Fixation in cold formalin solution, or treatment with fat solvents weakens or abolishes this effect with the result that phosphatase staining is not markedly influenced by pretreatment with salts. The effect of surfactants in inhibiting acid phosphatase staining is diminished by fixation in formalin. Treatment with M/2 CaCl2 of fresh frozen sections of mice organs partly inhibited the histochemical staining of phospholipids. The findings indicate that acid phosphatase molecules are bound to polar lipids and that under the influence of excess of Ca ions the lipoproteic molecules of acid phosphatase form droplets bounded by hydrophobic groups of the lipids. In such droplets the enzyme molecules are not available to act on substrates dissolved in the medium, and the droplets may be regarded as lysosomes. Under the influence of excess Na ions in the milieu the lipoprotein layer breaks into droplets bounded on the outside by the enzyme protein and the hydrophilic groups of the phospholipids. Such particles probably represent microsomes. The implications of these conclusions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319214
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  • 8
    Electronic Resource
    Electronic Resource
    Differentiation of macrophages from Lewis lung carcinoma tumour cells in tissue sections by their α-naphthyl butyrate esterase activity (1981)
    Springer
    Journal of molecular histology 13 (1981), S. 975-981 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The activities of α-naphthyl bytyrate esterase, non-specific esterase, indoxyl esterase and acid phosphatase were studied histochemically in macrophages in cultures and in tissue sections of primary tumours and metastases of Lewis lung carcinoma (3LL). All macrophages in culture were stained by the α-naphthyl butyrate esterase procedure. In tissue sections, macrophages were intensely stained by the butyrate esterase procedure, while the tumour cells were not stained at all; macrophages were easily differentiated from 3LL cells. Non-specific esterase was evident in both tumour cells and macrophages. Indoxyl esterase and acid phosphatase were present in macrophages at the margin of the tumour only. The α-naphthyl butyrate esterase-positive macrophages differed in shape and location from acid phosphatase and indoxyl esterase-positive macrophages. This may indicate a difference in characteristics between macrophages found inside a tumour and those found at the tumour margins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01002637
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  • 9
    Electronic Resource
    Electronic Resource
    Movements of myelin sheath particles in a weak electric fieldThis work was supported by grant 138 of the National Multiple Sclerosis Society, New York. (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 67 (1966), S. 339-344 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: When a weak electric field is applied to longitudinal sections of myelinated nerve, myelin material migrates out of the tissue edges towards both poles. the materials migrating from the anodal and cathodal edges seem to be chemically similar but differ in physical properties. at the anodal edge the bimolecular lipid layers rearrange into spherical micelles forming an “oil in water” emulsion, and at the cathodal edge into micelles forming a “water in oil” emulsion. the latter is unstable in water and is rapidly transformed into an “oil in water” emulsion. these findings have physiological and structural implications for the study of biological membranes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040670214
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  • 10
    Electronic Resource
    Electronic Resource
    Oxidation of lipids and membranes I: In vitro formation of peroxidative lipid polymers (1975)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 3 (1975), S. 80-89 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Fluorescent polymers were obtained by oxidizing partly emulsified linolenic acid with different oxidants. The speed of formation of polymers differed for the various oxidants, and the difference was not a simple function of the oxidation potential. The speed of polymerization also depended on the nature of the emulsion.The presence of egg albumen in the emulsion enhanced polymer formation with all oxidants. When the oxidants used are arranged in the order of decreasing speed of polymer formation, the order is different in the presence of albumen from what it is in the absence of albumen.With different oxidation catalysts most antioxidants and amino acids tested enhanced polymerization. In oxidation with ferric ions, with K-dichromate, and without added oxidants the only antioxidants which delayed polymerization were “inhibitors”. “Retarders” enhanced polymerization. With KMnO4 slight delay was caused by some retarders.The findings indicate that not only oxidation catalysts, but also proteins, amino acids, and antioxidants enhance polymerization. The possibility is suggested that in animal cells lipid pigment formation might represent a mechanism for neutralizing free radicals.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400030109
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