SUMMARY: Nutritional tests on yeasts which utilize -inositol as the sole carbon source or which have red pigment have been carried out on deined media solidified with silica gel (Ludox HS-40) in multicompartment polystyrene dishes. Yeasts of the above types isolated from soft fruits were tested together with 189 named strains representing 28 genera and 110 species and varieties. The results obtained were compared with those for growth on media solidified with several commercially prepared agars. Methods are described for purifying commercial samples of Ludox HS-40 and for removing contaminating sugars from some di-and trisaccharides used in the tests.


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