Abstract
In an earlier publication from this laboratory, Yusef (6) reported that the growth of Polyporus schweinitzii No. 86353 was markedly improved by the addition of small amounts of malt extract to a basal medium containing dextrose, vitamins and vitamin free casein hydrolysate. He suggested that unidentified growth-promoting substances for this fungus were present in malt extract. We have continued the investigation and have concluded that this isolate suffers from a partial deficiency for at least two unidentified growth substances.
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