corn, 2.3 %; acid-hydrolyzed soybean meal, 4.7 %; deodorized
kerosene (Deo-Base; Sonneborne Chemical and
Refining Corp., New York, N. Y.) 5 %; soybean or cottonseed
oil, 5 %; nonionic detergent (Triton X-100; Rohm
and Haas Co., Philadelphia, Pa.), 0.12 %; thiamine
HCl, 0.1 %; NaOH to pH 6.5. Amounts (100-ml) of
medium were dispensed into 500-ml Erlenmeyer flasks
and sterilized for 30 min at 121 C. After the flasks were
incubated for 2 days on a rotary shaker operating at 200