An m(k) (-)r(k) (-) mutation exerted no measurable effect on 5-bromouracil incorporation by a thymineless derivative of Escherichia coli K.

Colicin K was purified from Escherichia coli K-235 (Col K) as a single protein free from polysaccharide. Its molecular weight was estimated at 70,000.

results the results showed that the chimeric recombinant protein induced strong humoral response as well as protection against live oral challenges using e. coli o157:h7. conclusions the rit could reduce bacterial shedding effectively. objectives the eae gene encoded intimin protein which is essential for colonization of the mucosa and a/e lesions formation by docking to the tir. materials and ...

Succinate fermentation was investigated in Escherichia coli strains overexpressing Actinobacillus succinogenes phosphoenolpyruvate carboxykinase (PEPCK). In E. coli K-12, PEPCK overexpression had no effect on succinate fermentation. In contrast, in the phosphoenolpyruvate carboxylase mutant E. coli strain K-12 ppc::kan, PEPCK overexpression increased succinate production 6.5-fold.