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  • 1
    Electronic Resource
    Electronic Resource
    Occurrence of heparin or its related acidic glucosaminoglycan in human aortic tissue (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 655-657 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Heparin und Glucosaminoglycan wurde in kleinen Mengen in der menschlichen Aorta mit Elektrophorese festgestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01944754
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of age on distribution of acidic glycosaminoglycans in normal human urine: Special reference to proportion of chondroitin sulfate A to the C-isomer (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 1219-1221 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Le sulfate A de chondroitine est un acide glycosaminoglycanes principal chez les enfants normaux. Mais cette substance diminue avec l'age, tandis que le sulfate C de chondroïtine a une tendance à augmenter. Il en résulte une diminution, de l'action du sulfate A sur le sulfate C. La prépondérence du sulfate C de chondroïtine se manifeste après l'adolescence. Il augmente continuellement au cours de la vie.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935081
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Tholeiitic basalt magmatism of Kilauea and Mauna Loa volcanoes of Hawaii (1970)
    Springer
    Naturwissenschaften 57 (1970), S. 108-113 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Summary The primitive magmas of Kilauca and Mauna Loa are generated by partial melting of mantle peridotite at depths of −60 km or more. Results of high-pressure melting experiments indicate that the primitive melt must contain at least 20% MgO in order to have olivine as a liquidus mineral. The least fractionated lavas of both volcanoes have olivine (Fa13) on the liquidus at 1 atmosphere, suggesting that the only substance lost from the primitive melt, during a rather rapid ascent to the surface, is olivine. This relation allows the primitive composition to be computed by adding olivine to the composition of an erupted lava until total MgO is at least 20 percent. Although roughly similar, historic lavas of the two volcanoes show a consistent difference in composition. The primitive melt of Mauna Loa contains 20% more dissolved orthopyroxene, a high-temperature melting phase in the mantle, and is deficient in elements such as potassium, uranium, and niobium, which presumably occur in minor low-melting phases. Mauna Loa appears to be the older volcano, deriving its magma at higher temperature and greater depth from a more depleted source rock.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00600044
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of glutamate and GABA on specific response properties of neurones in the visual cortex (1974)
    Springer
    Experimental brain research 21 (1974), S. 285-297 
    Details
    ISSN: 1432-1106
    Keywords: Visual cortex ; Receptive fields ; Response specificity ; Electrophoresis ; Glutamate ; GABA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Changes of specific response properties of single neurones in area 17 of the cat's cortex were studied during electrophoretic administration of glutamate and gamma-aminobutyric acid (GABA). Most cells were excited by glutamate. The diameter of the cells' discharge field (ERF) was enlarged by less than 1° in most cells, and the amplitude of the response within the ERF was increased. There was a weak correlation between the original size of the ERF and its enlargement during glutamate. Stimuli presented in non-optimal orientations and moved in the non-optimal direction became also effective in eliciting an excitatory response. When glutamate “doses” sufficiently high to increase background activity were used, inhibitory regions of the receptive fields could be revealed. GABA decreased the excitability of the cells until the response was totally blocked. In some cases, glutamate also decreased the excitability of cells. Simultaneous recordings from two cells suggested that the inhibitory effect may be indirect through activation of nearby inhibitory neurones. It is pointed out that extracellular recording combined with electrophoretic administration of glutamate can reveal information about a cell's properties which can otherwise only be obtained with intracellular recordings. The functional implications of the results are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235748
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  • 5
    Electronic Resource
    Electronic Resource
    Role of microstructure of nerve impulse train in relation to transmission of neuronal activity and coding mechanism of neural information (1974)
    Springer
    Biological cybernetics 16 (1974), S. 119-126 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Input-output relation were of giant neurons of a marine mollusc, Onchidium verruculatum, and a computer-simulated neuron investigated in terms of microstructure of nerve impulse train. The microstructure of input impulse train, the size of a unitary EPSP, and the extent of spontaneous firing activity of a single neuron had an important influence upon the effective summation of arriving synaptic inputs, the elicitation of output spikes, and intervals between succeeding output spikes. The neuron responded differently to respective input trains with different time structures, i.e. it discriminated input time pattern to various degrees. The manner in discrimination of input time pattern was dependent on the size of the unitary EPSP and the extent of the spontaneous firing activity, if it had. Some discussions were made with regard to possible coding systems of neural signal, assuming a frequency code and/or a pattern code.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271635
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of copper(II) on the Formation of Magnetite from Colloidal Iron (II) Hydroxide (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 386 (1971), S. 340-344 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Geschwindigkeit der Selbstzersetzung von Fe(OH)2 unter Luftausschluß wurde unter Zusatz von Cu(II) (0-6 Atom-%) bei 30 bis 50°C bestimmt. Das Maximum der Geschwindigkeit und ein Minimum der Aktivierungsenergie tritt bei 1% Cu/Fe auf. Dies wird zwei gleichzeitig wirksamen Einflüssen des Cu zugeschrieben: Erstens der Verzerrung des Koordinationskomplexes durch Cu2+, die die Strukturumwandlung in Magnetit erleichtert, dagegen wirkt negativ der Einfluß des Cu, der zur Vergrößerung der Fe(OH)2-Kristalle führt. Röntgenaufnahmen und elektronenmikroskopische Beobachtungen bestätigen die Annahme.
    Notes: The rate of self-decomposition of iron(II) hydroxide doped with various amounts (0-6 atomic%) of Cu(II) was determined in the absence of oxygen at the temperature range of 30 to 50°C. The maximum rate and the minimum activation energy were observed at 1% Cu/Fe. The result was attributed to the two simultaneous actions of Cu2+, i.e., the distortion effect on coordination complex of Fe2+ by Cu2+ to ease the structural transformation to magnetite and the hindering effect on magnetite formation revealed consequently in the growth of Fe(OH)2 crystals. Both effects were proved by X-ray diffraction and election-microscopic observations.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713860312
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