Facteurs Chimiques Biothermiques

Publisher Website
Google Scholar
Abstract
The ventricle of the snail, Helix aspersa, was used in a study of the role of monovalent and divalent cations in the regulation of temp. of living or-ganisms. Maximal, minimal, and optimal temps. for automatic activity (ventricular rhythm) were investigated when the isolated organ was immersed in various salt solns. The control medium comprised isotonic chloride solns. mixed in the vol. ratio of 10:1:2:2 of NaCl, KC1, CaCl2 and MgCl2. Replacement of the control medium by isotonic solns. of Na-Cl, CaCl2, or MgCl2 alone lowered the optimal temp., the cation effect increasing in the order named. Decreasing the Na/K ratio of the medium raised the minimal and optimal temps., but had practically no effect on the maximal temp. Growth of Saccharomyces cerevisiae at elevated temps. was favored by addition of NaCl, KC1, or glucose to the culture medium. Survival of frogs at elevated temps. is favored by K and lessened by Ca and Mg, when solns. of these salts are injected into the lymph sacs.

This publication has 0 references indexed in Scilit: