Several mutants isolated after N-methyl-N'-nitro-N-nitrosoguanidine mutagenesis of Streptomyces cacaoi strain KCCS-0352, were resistant to benzylpenicillin ranging in concentration from 1,000 to 5,000 micrograms/ml (4- to 20-fold more resistant than the parent). These mutants also acquired resistance to mecillinam, cephamycin C and methicillin. The affinity for beta-lactams of penicillin-bindin...

The regulation of fatty acid biosynthesis by compounds that are required for growth of Bacillus thuringiensis was investigated using an vivo assay developed to measure fatty acid synthesis in germinating spores. A minimal glucose-ammonium-salts medium does not support growth even though previous radiorespirometric studies have shown B. thuringiensis to possess intact tricarboxylic acid and Embd...

Abstract We examined the efficacy of ethylenediaminetetraacetic acid (EDTA) for removing humic contaminants from collagen extracted ancient bone. Humic must be removed to obtain reliable stable isotope values bone collagen, given that acids have consistently lower δ 13 C than collagen. The purpose our research was examine if EDTA treatment could effectively remove and thus serve as an alternati...

Kinetics of radical oxidation of 4-mercapto-2-nitrobenzoic acid was investigated in the presence of hydrogen peroxide and iron(II) sulfate, i.e. SL hydroxyl radicals generating system. Initial velocities of radical reaction were established by numerization of the course of kinetic dependences. The value of initial reaction velocity was used as a criterion for evaluation of efficacy of ethylened...

platelet adherence surrounding leucocytes in a rosette formation or platelet satellitism is a rare phenomenon. this finding has been observed almost exclusively in ethylenediaminetetraacetic acid treated blood at room temperature. the mechanism underlying this phenomenon is not fully understood. in many reports of platelet satellitism platelets clump to polymorphonuclear neutrophils in healthy ...

Chemotaxis by Pseudomonas aeruginosa RM46 has been studied, and conditions required for chemotaxis have been defined, by using the Adler capillary assay technique. Several amino acids, organic acids, and glucose were shown to be attractants of varying effectiveness for this organism. Ethylenediaminetetraacetic acid was absolutely required for chemotaxis, and magnesium was also necessary for a m...

The sensitivity to sodium lauryl sulfate (SLS) of Shigella flexneri and Escherichia coli is determined by at least three genes. One site is located near the lactose operon, and two loci are cotransducible with the arabinose operon. Calcium ions protect against SLS lysis. One gene is concerned with the relative ability of the bacterium to retain calcium against such chelating agents as ethylened...