Abstract
LONDON Royal Society, May 5.—A. V. Hill: A closer analysis of the heat production of nerve. The heat production of nerve is believed to occur in two phases, ‘initial’ and ‘recovery’: the former is presumably an accompaniment of the physical and chemical changes which take place during the propagation of the impulse; the latter, of the processes by which those changes are reversed and the nerve restored to its initial state. It is not easy to separate the one from the other. The possibility that the initial heat is due to phosphagen breakdown or lactic acid formation is discussed: the quantities available are sufficient.—H. E. Roaf: The influence of coloured surrounds and coloured backgrounds on visual thresholds. Exposure of the retina to light raises the differential threshold. For the fovea, the chief influence in raising the threshold is the simultaneous exposure to light, and for the parts of the retina outside the fovea there is considerable spread of effect from one part of the retina to another. The influence of wave-length on the results is very striking with foveal vision, as ‘red’ light raises the threshold for all parts of the spectrum, but ‘green’ and ‘blue’ lights have a negligible effect on the long wavelength end of the spectrum.N. Gavrilescu, A. P. Meiklejohn, R. Passmore, and R. A. Peters: Carbohydrate metabolism in birds. The site of the biochemical lesion in avian polyneuritis. Oxygen uptakes of normal and avitaminous brains have been measured. The results suggest that vitamin B1 deficiency is connected essentially with the intermediary metabolism of carbohydrate.
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Societies and Academies. Nature 129, 733–736 (1932). https://doi.org/10.1038/129733b0
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DOI: https://doi.org/10.1038/129733b0