نتایج جستجو برای: hemolysin factor

تعداد نتایج: 846727  

Journal: :Iranian journal of veterinary research 2014
Z Moraveji M Tabatabaei H Shirzad Aski R Khoshbakht

The staphylococci are important pathogenic bacteria causing various infections in animals and human. Hemolysin is one of the virulence factors of coagulase-positive (CPS) and coagulase-negative staphylococci (CNS). The aims of the study were to characterize hemolysins of Staphylococcus spp. isolated from human and bovine origin, phenotypic- and genotypically. Characterization of hemolysin pheno...

2014
Eizo Takahashi Haruka Ozaki Yoshio Fujii Hidetomo Kobayashi Hiroyasu Yamanaka Sakae Arimoto Tomoe Negishi Keinosuke Okamoto

We examined the properties of exotoxins produced by Aeromonas trota (A. enteropelogenes), one of the diarrheagenic species of Aeromonadaceae. Nine of 19 A. trota isolates that grew on solid media containing erythrocytes showed hemolytic activity. However, the hemolytic activities of the culture supernatants of these hemolytic strains of A. trota were markedly lower than those of A. sobria when ...

2003
B.

The content in hemolysin of a solution is commonly measured as the amount which is just sufficient to produce complete hemolysis of an arbitrary quantity of red blood cells, usually 0.5 cc. of a 5 per cent suspension of washed erythrocytes. The method employed for such measurement gives results which are neither exactly comparable in determinations made at different times, nor highly precise. T...

Journal: :Infection and immunity 2000
A Takahashi N Kenjyo K Imura Y Myonsun T Honda

A hemolytic toxin related to thermostable direct hemolysin (TDH), TDH-related hemolysin (TRH), produced by Kanagawa-phenomenon-negative Vibrio parahaemolyticus is suspected of playing an important, but yet-to-be-elucidated role in diarrhea caused by this organism. In cultured human colonic epithelial cells, TRH increases Cl(-) secretion, followed by elevation of intracellular calcium.

Journal: :Infection and immunity 1998
R A Moxley E M Berberov D H Francis J Xing M Moayeri R A Welch D R Baker R G Barletta

Pigs infected with hemolytic F4(+) strains of enterotoxigenic Escherichia coli often develop septicemia secondary to intestinal infection. We tested the hypothesis that inactivation of hemolysin would reduce the ability of F4(+) enterotoxigenic E. coli to cause septicemia in swine following oral inoculation. Inactivation of the hemolysin structural gene (hlyA) did not decrease the incidence of ...

Journal: :Antimicrobial agents and chemotherapy 2010
Sin-Sien Jiang Tzu-Yi Lin Won-Bo Wang Ming-Che Liu Po-Ren Hsueh Shwu-Jen Liaw

Proteus mirabilis is known to be highly resistant to the action of polymyxin B (PB). However, the mechanism underlying PB resistance is not clear. In this study, we used Tn5 transposon mutagenesis to identify genes that may affect PB resistance in P. mirabilis. Two genes, ugd and galU, which may encode UDP-glucose dehydrogenase (Ugd) and UDP-glucose pyrophosphorylase (GalU), respectively, were ...

2012
Yosuke Omae Kazuhisa Sekimizu Chikara Kaito

Background: Staphylococcus aureus spreads on soft agar surfaces, a phenomenon called “colony-spreading”. Results: We purified delta-hemolysin from S. aureus culture supernatant as an inhibitor of colony-spreading, and its disrupted mutant had high colony-spreading ability. Conclusion: S. aureus negatively regulates colony-spreading by secreting delta-hemolysin. Significance: This is the first e...

Journal: :The Journal of Experimental Medicine 1957
Joseph C. Turner

Lipide extracts of the red cells of several animal species have been analyzed chromatographically. Genetically determined differences in phospholipide composition were found. Lecithin is absent from the cells of ox, sheep, and goat. Cells containing lecithin are susceptible to the direct hemolysin of cobra venom while cells not containing lecithin are resistant. The facts indicate that the dire...

Journal: :Journal of bacteriology 2005
Yoshitsugu Nakaguchi Mitsuaki Nishibuchi

We determined the transcriptional start site of the thermostable direct hemolysin-related hemolysin gene (trh) of Vibrio parahaemolyticus by using a PCR-based method and identified the promoter. Mutagenic analysis indicated that the promoter-bearing region rather than its downstream inverted repeat sequence was responsible for the low-revel of trh transcription.

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