[Lag phage in Candida tropicalis growth on phenol]

When Candida tropicalis CD5 was grown on phenol, substances eliminating the inhibiting action of phenol accumulated in the cultural broth during the lag phase of growth. C. tropicalis CD5 was cultivated on the filtrate of the cultural broth obtained after the lag phase and containing 0.18% of phenol as a carbon source; in that case, the culture grew by 24 h earlier since the lag phase was reduced. C. tropicalis CD5 was capable of growing on a filtrate containing 0.21% of phenol though the culture could not grow at this phenol concentration on the original medium. The filtrate preserved its properties after dialysis through a half-permeable membrane.