Abstract

WHILE studying the effect of salt concentration on the respiration of an emergent brown alga Hormosira banksii, potassium cyanide was found to have an effect on the apparent free space. When cation analyses were performed on tissue exposed to 10−4 M potassium cyanide, an increase was observed in the apparent free space over the control value with respect to the sodium ions, this effect being most evident at pH 6.0. Experiments have been performed to assess the influence of potassium cyanide on the free space of Hormosira using the radioisotopes chromium-51 (as sodium chromate), iodine-131 (as sodium iodide), phosphorus-32 (as orthophosphate) and sulphur-35 (as potassium sulphate).

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