Studies on marine occurring yeasts: Respiration, fermentation and salt tolerance

摘要: The effect of various NaCl concentrations on respiration and fermentation rates in cells with or without added glucose as exogenous substrate well respiratory quotients was determined for Debaryomyces hansenii, Saccharomyces cerevisiae, Cryptococcus albidus, Candida zeylanoides, all yeasts isolated from marine environment. A given strain had about the same fermentatory intensity at 0% 4% (w/v). further increase considerably reduced oxygen uptake CO2-evolution. D. hansenii most tolerant yeast tested, giving 10% activity still a concentration 24% NaCl, whether activities whole cell homogenates were determined. For S. cerevisiae Cr. albidus to degree 16% cells, 12% albidus. somewhat higher evidently tolerated than growth, very obvious case C. zeylanoides. minimum values water (a w) permitting when produced by electrolytes (NaCl, KCl, Na2SO4), lower due sugars (metabolizable non-metabolizable lactose) lowest glycerol. a w per se not solely decisive limitation activity. Attempts made assess an high uptake. potassium content highly halotolerant those other decreased external, consequently internal, Na+ concentration. decrease K+ can presumably only proceed certain extent, below which ability growth lost.