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Bulen, William A. (Charles F. Kettering Foundation, Yellow Springs, Ohio). Effect of tungstate on the uptake and function of molybdate inAzotobacter agilis . J. Bacteriol.82: 130–134. 1961.—The reported competitive inhibition of molybdate by tungstate was investigated in an effort to elucidate molybdenum functions associated with nitrogen fixation byAzotobacter agilis (A. vinelandii ). Growth, respiration, and N2 15 -incorporation experiments with normal and molybdenum-deficient cells indicated that tungstate inhibits the uptake of molybdate but does not compete with the metabolically functional molybdenum of cells metabolizing N2 . Neither a molybdenum requirement nor a tungstate inhibition was observed with cells metabolizing urea.

EFFECT OF TUNGSTATE ON THE UPTAKE AND FUNCTION OF MOLYBDATE IN AZOTOBACTER AGILIS