Hanseniaspora valbyensis

Abd-El-Al and Phaff (39) also found -glucanase activities in intracellular extracts of Hanseniaspora valbyensis and Hanseniaspora uvarum and in the culture fluid of H. valbyensis. In contrast to the other yeasts, pustulan was not hydrolyzed by these preparations, and laminarin was hydrolyzed yielding oligosaccharides. This suggested that these yeasts produced an endo-/3- (1 — 3) -glucanase, and subsequently such an enzyme was partially purified from the culture fluid of H. valbyensis (39). 

Leonian and Lilly (201) examined 10 strains of Saccharomyces cerevisiae for the effects on 72 hr. growth (25°) of omission of various vitamins from the media none of the strains showed decreased growth on omission of pyridoxin. Marchant (245) had strains which were much more sensitive to pyridoxin, and presumably were less effecient synthesizers of it than the strains examined by Leonian and Lilly. Two yeasts, Sacch. hanseniaspora valbyensis and yeast 2375, showed a marked stimulation w ith pyridoxin which could, for these two yeasts, replace a bios Vll solution. A strain of Sacch. cerevisiae has been trained to grow on a completely synthetic medium without added vitamins the yeast then synthesized thiamin, riboflavin. 

Rough/Smooth, hat/ round-shaped ascospores Hanseniaspora occidentaUs osmophila uvarum valbyensis vineae... 

Hanseniaspora (occidentalis, osmophila, uvarum, valbyensis, vineae) b No ascospore formation. 

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See also in sourсe #XX -- [ ]

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