Voges-Proskauer test using 1-naphthol purified by steam distillation.

MACLEOD, R. A., HOGENKAMP, H., AND ONOFREY, E. 1958 Nutrition and metabolism of marine bacteria. VII. Growth response of a marine Flavobacterium to surface active agents and nucleotides. J. Bacteriol., 75, 460-465. MICKINNEY, R. E. AND HORWOOD, M. P. 1952 Fundamental approach to the activated sludge process. I. Floc-producing bacteria. Sewage and Ind. Wastes, 24, 117-560. MCKINNEY, R. D. AND WEICHLEIN, R. G. 1953 Isolation of floc-produicing bacteria from activated sludge. Appl. MIicrobiol., 1, 259-261. Niss, H. E. 1958 Nitrogen metabolism in Hansenula anomala; a thesis. Purdue University, Lafayette, Indiana. RICH, L. G. 1955 Respiration studies on the organic nitrogen preferences of Zoogloea ramigera. Appl. Microbiol., 3, 20-24. Society of American Bacteriologists Committee on Bacteriological Techniques. 1957 Manual of mnicrobiological methods. McGraw Hill Co., Inc., New York, New York. WATTIE, E. 1943 Cultural characteristics of zoogloealforming bacteria isolated from activated sludge and trickling filters. Sewage Works J., 15, 476-479.