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“57, 151, 1944) reported that a decreased amount of folic acid was produced in cultures containing sulfanilamide by both sensitive and resistant strains of Escherichia coli, and Harrison and Clapper (Bacteriol.”
“Summary 1) Acetylation of sulfanilamide and of isoniazid in pigeon liver extracts was markedly inhibited (non-competitively) by 4-amino analogues of folic acid.”
Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine • 1958 | View Paper
“SEVAG, M. G., KoFT, B. W., and STEERS, E. Failurie of folic acid to antagonize sulfanilamide non-competitively in the growth of Lactobacillus arabintosus 17-5.”
The Journal of biological chemistry • 1950 | View Paper
“Later, Winkler and de Haan (1948) reported that, in the presence of methionine and adenine, serine and pteroylglutamic acid (or thymine) would reverse the inhibitory effects of higher concentrations of SAN.”