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Ohne Zusammenfassung(1)Vorläufige Mitteilung nach einem am 4.8.53 auf der Tagung der Deutschen Sektion der Union in Hamburg gehaltenen Vortrag.  相似文献   

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The toxic fractions were isolated from unsuitable molasses,not accepted for citrie acid fermentation. When the strains of A. niger: Z-208, R-8, P-16, R-65/4, all good producers of citric acid, were cultivated on the medium containing such molasses, the growth patterns were altered and the strains lost their acid-forming properties. After dialysis of the molasses samples fractions of low and high molecular weight were obtained but the latter had no effect neither on growth nor on fermentation patterns. The low molecular part, responsible for the toxicity of molasses against A. niger, was fractionated with Sephadex G-25. In such a way a low coloured fraction which inhibited the growth of A. niger strains could be separated. However there were no toxic compounds in the fractions with the highest values of absorbancy. The susceptibility of the strains,to some extent, depended on their ability for adaptation to the toxic fractions of molasses.  相似文献   

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Summary In the first part of this paper some phenomena in the nervous system are described, concerning the time interval structure of the nervous signals. The characteristics of the neurons are introduced and interpreted. It is shown theoretically and proved by experiments, that the time interval distributions in the axons can be appoximated by gamma-distributions.In the second part, some experiments with electronic neuron models are described. It is tried to find a correlation between the interval distributions of the output signals and the structure of the systems.The third part concerns experiments at the cerci of the cockroach periplaneta americana. From the measured transition probabilities for various amplitudes, the entropy, the transinformation rate and the channel capacity of various nervous channels are calculated.The average transinformation rate results between 1.5 to 30 bit/sec. The channel capacity is about threefold the transinformation rate.

Die Autoren danken Herrn Professor Dr.-Ing. habil. H. Tischner für die Anregung zu dieser Arbeit und der Deutschen Forschungsgemeinschaft für die Bereitstellung der notwendigen Mittel.  相似文献   

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Ohne ZusammenfassungHierzu 10 Tabellentafeln.  相似文献   

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