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The dependence of Paramecium galvano-taxis on sulphydryl groups



The dependence of Paramecium galvano-taxis on sulphydryl groups



Biofizika [Transl] 2(5/6): 656-660



The galvanotaxis of paramecia is distorted in the presence of glutathione and re-established when free SH-groups are introduced. When glutathione acts on paramecia, an increase in the threshold of cathodic galvanotaxis is observed; introduction of SH-groups in the form of cysteine leads to a lowering of the threshold of cathodic galvanotaxis to the original value. In the presence of glutathione a shift of the optimum conditions for cathodic galvanotaxis of paramecia takes place in the direction of higher currents; introduction of cysteine restores the original conditions. The data enable us to propose that the irritability and metabolism are one in paramecia and that it is possible to control the level of irritability in living matter by acting on metabolic links.

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