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  • Title: Influence of solute and hydrogen ion concentration on the water relations of some xerophilic fungi.
    Author: Pitt JI, Hocking AD.
    Journal: J Gen Microbiol; 1977 Jul; 101(1):35-40. PubMed ID: 19558.
    Abstract:
    Germination and growth of six xerophilic fungi, Aspergillus flavus, Aspergillus ochraceus, Eurotium chevalieri, Chrysosphorium fastidium, Wallemia sebi and Xeromyces bisporus were examined on media of a wide range of water activities (aw). The influence of three solutes, NaCl, glycerol and a glucose/fructose mixture, was studied at pH 4-0 and pH 6-5 using a plate-slide technique. Germination times and growth rates were affected by solute type, but the influence of pH was less marked. Except for Wallemia sebi, the fungi grew most strongly on glucose/fructose and were partially or completely inhibited by NaCl. The results showed that a universal isolation medium for xerophilic fungi could be based on glycerol or glucose/fructose but not on NaCl as aw-limiting solute.
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