Summary
Addition of tetrathionate and nitrate to EMB medium allows the isolation from Salmonella typhimurium LT2 of mutants lacking specifically nitrate reductase A activity. Genetic localization of such chl-C mutations leads to the conclusion that the affected gene is close to tdk but outside the trp-tdk segment and that chl-C is an early marker in Hfr B2.
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Casse, F., Chippaux, M. & Pascal, MC. Isolation from Salmonella typhimurium LT2 of mutants lacking specifically nitrate reductase activity and mapping of the chl-C gene. Molec. Gen. Genet. 124, 247–251 (1973). https://doi.org/10.1007/BF00293095
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DOI: https://doi.org/10.1007/BF00293095