Separation of Microorganisms by Flotation: I. Development and Evaluation of Assay Procedures.

determination of nitrate and nitrite in soil. Analyst, 80, 141-145. COOPER, C. M., FERNSTROM, G. A., AND MILLER, S. A. 1944 Performance of agitated gas-liquid contactors. Ind. Eng. Chem., 36, 504-509. DONALD, C., PASSEY, B. I., AND SWABY, R. J. 1952 Bioassay of available trace metals from Australian soils. Australian J. Agr. Research, 3, 305-325. ENGEL, M. S. AND ALEXANDER, M. 1958 Culture of Nitr osomnonas europaea in media free of insoluble constituents. Nature, 181, 136. EYLAR, 0. R., JR. AND SCHMIDT, E. L. 1959 A survey of heterotrophic micro-organisms from soil for ability to form nitrite and nitrate. J. Gen. Microbiol., 20, 473-481. GUNDERSEN, K. 1955 Effects of B-vitamins and amino-acids on nitrification. Physiol. Plantarum, 8, 136-141. MEIKLEJOHN, J. 1952 Minimtum phosphate and magnesium requirements of nitrifying bacteria. Nature, 170, 1131. MEIKLEJOHN, J. 1953 Iron and the nitrifying bacteria. J. Gen. Microbiol., 8, 58-65. MEYERHOF, 0. 1916a Untersuchungen uber den Atmungsvorgang nitrifiizierender Bakterien. I. Die Atmtung des Nitratbildners. Arch. ges. Physiol., 164, 353-427. MEYERHOF, 0. 1916b Untersuchungen uber den Atmungsvorgang nitrifizierender Bakterien. IL. Beeinflussungen der Atmuing des Nitratbildners durch chemische Substanzen. Arch. ges. Physiol., 165, 229-284. STOJANOVIC, B. J. AND ALEXANDER, M. 1958 Effect of inorganic nitrogen on nitrification. Soil Sci., 86, 208-215. ZAVARZIN, G. A. 1958 The efTect of heavy metals on nitrification (In Russian). Mikrobiologiya, 27, 542-546.