Electronmicroscopy of the anti-bacterial agent produced by Escherichia coli 15

Electron microscopy of the anti-bacterial agent produced by Escherichia coli 15.

When it was first observed that the strain 15 of Escherichia coli, after u.v.-irradiation and further incubation, would eventually lyse and release an anti-bacterial agent, this agent was considered to be a ‘colicine’ (Mukai, 1960; Ryan, Fried & Mukai, 1955). The possibility that, in addition, a defective phage was produced, was left open. But, since in an u.v.-induced lysate of this strain all...

Antibacterial Activity of the Peptide Microcin J25 Produced by Escherichia coli

Background and objectives: Bacteriocins are generally active antimicrobial peptides effective against bacteria closely related to the producer. Escherichia coli produce two bacteriocins: colicins and microcins. Microcin J25 (Mcc J25) is an antibacterial peptide that inhibits bacterial transcription by disrupting the nucleotide-uptake channel of bacterial RNA polymerase. The objective of this st...

Cytotoxins Produced by Shiga Toxigenic Escherichia coli

The Shiga toxigenic Escherichia coli (STEC) O113:H21 strain 98NK2, which was responsible for an outbreak of hemolytic uremic syndrome, secretes a highly potent and lethal subtilase cytotoxin that is unrelated to any bacterial toxin described to date. It is the prototype of a new family of AB 5 toxins, comprising a single 35-kilodalton (kD) A subunit and a pentamer of 13-kD B subunits. The A sub...

in vitro anti-bacterial and anti-adherence effects of lactobacillus delbrueckii subsp bulgaricus on escherichia coli

considering the emergence of antibiotic resistance, scientists are interested in using new antimicrobial agents in the treatment of infectious diseases including infections of the enteric systems. lactic acid bacteria have the great potential to produce antimicrobial compounds that inhibit and control pathogenic bacteria. the aim of this study was to determine the anti-bacterial and anti-adhere...

evaluation of anti-bacterial and anti-adherence properties of lactobacillus delbrueckii susp bulgaricuis on escherichia coli