R factors fi(+) and fi(-), with various combinations of drug-resistance markers and isolated from independent sources, were transduced by phage P1kc in Escherichia coli and by phage P22 in Salmonella typhimurium. Usually the entire R factor was transduced by P1kc in E. coli, as indicated by the absence of segregation of the drug-resistance markers from their conjugal transferability. In contras...

Recently, we showed that cultured guinea pig gastric pit cells possess a phagocyte NADPH oxidase-like activity, which was up-regulated by Helicobacter pylori lipopolysaccharide. We demonstrate here that these cells express all of the phagocyte NADPH oxidase components (gp91-, p22-, p67-, p47-, and p40-phoxes). Treatment with lipopolysaccharide increased the expression of gp91-, p22-, and p67-ph...

background: toxoplasma gondii , the obligate, intracellular parasite afflicts human in diverse ways such as ingestion of tissue cysts in undercooked meat. the aim of this study was to assess the prevalence and genotyping of toxoplasma isolated from meat samples being consumed in east azerbaijan, northwest of iran. methods: overall, 150 samples including chicken, beef and lamb meat were collecte...