nfluence of reducing and oxidizing compounds and of the redox potential of the medium on the biomass of Scenedesmus quadricauda (Turp.) Breb.

Abstract

The influence was investigated of several concentrations of the reducing agents: cysteine, glutathione, ascorbic acid, pyracatechol and of the oxidizing agents: KMnO₄, K₄Cr₂O₇ and H₂O₂ on the total dry weight increment and that of protein with reference to redox potential changes of the medium in <em>Scenedesmus quadricauda</em> cultures. The culture was run in a photothermostat. It was found that the reducing compounds had as a rule a stimulating influence under 24-h illumdnation, whereas the oxidilzing agents gave the same effect when a period of 7-h darkness was applied within 24 h.