R M Pengra

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Skinner (1928) tested 23 strains of Bacteriumn aerogenes (Aerobacter aerogenes) and reported that two, and possibly a third, assimilated gaseous nitrogen when cultured in liquid medium, a claim confirmed 27 years later by Hamilton and Wilson (1955) using the N" isotopic method. Their experiments indicated that A. aerogenes incorporated significant amounts(More)
Yoch, D. C. (South Dakota State University, Brookings), and R. M. Pengra. Effect of amino acids on the nitrogenase system of Klebsiella pneumoniae. J. Bacteriol. 92:618-622. 1966.-The effect of exogenous amino acids and the free amino acid pool on the synthesis of the nitrogenase system of Klebsiella pneumoniae M5al (formerly Aerobacter aerogenes M5al) was(More)
Many steps in the metabolic pathway of biological nitrogen fixation are still unknown. In bacteria, the nitrogen-fixing sequence is thought to proceed through ammonia (Zelitch, Rosenblum, and Wilson, J. Biol. Chem. 191:295, 1951; Newton, Wilson, and Burris, J. Biol. Chem. 204:445, 1953; Wilson and Burris, Ann. Rev. Microbiol. 7:415, 1953; Virtanen, Angew.(More)
Walls of Mortierella parvispora, Pullularia pullulans, Absidia repens, Fusarium oxysporum, and of several Penicillium species varied in their susceptibilities to digestion by glucanase and chitinase. Polysaccharides were present in the residues remaining after enzymatic digestion. Acid hydrolysates of the walls contained glucose, glucosamine, and a small(More)
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