OLIVINE-RICH CLAST IN THE VACA MUERTA MESOSIDERITE. R. C Greenwood , H. Haack, P. C. Buchanan, I. A. Franchi, C. L. Smith , D. Johnson and T. H. Burbine, Planetary and Space Sciences Research Institute, Open University, Walton Hall, Milton Keynes, MK7 6AA, UK ([email protected]), Natural History Museum of Denmark, Øster Voldgade 5-7, DK-1350 Copenhagen K, Denmark, Geology, Kilgore Colleg...

Foods with animal origins play a substantial role in the transmission of Helicobacter pylori. The present investigation was carried out to study the vacA and cagA genotypes status of H. pylori isolated from various types of meat samples. Two hundred and twenty meat samples were collected and cultured. H. pylori-positive strains were analyzed for the ...

conclusions about 90% of h. pylori strains potentially contained vaca s2m2 and s1m2 genotypes. infection with h. pylori strain containing the caga gene or the vaca s1m1 and s1m2 genotypes was associated with increased incidence of peptic ulcer disease (pud). objectives the aim of this study was to determine the frequency of two toxins and genotypes of vaca toxin in patients referred to a centra...

Helicobacter pylori is the leading bacterial cause of food-borne illness worldwide and plays a major role in the development of chronic gastritis, peptic ulcer, and gastric cancer. Strains isolated from patients contain the cagA gene (cytotoxin-associated gene A) and produce the vacuolating cytotoxin, VacA. Recent molecular and cellular studies of VacA action have begun to unravel its structure...

The functional importance of the amino terminus of the Helicobacter pylori vacuolating cytotoxin (VacA) was investigated by analyzing the relative levels of vacuolation of HeLa cells transfected with plasmids encoding wild-type and mutant forms of the toxin. Notably, VacA's intracellular activity was found to be sensitive to small truncations and internal deletions at the toxin's amino terminus...

The vacA s and m genotypes and the presence of cagA and IS605 were determined in Helicobacter pylori strains from patients with mono- and multiple infections. Surprisingly, these genetic markers were not associated with nonulcer dyspepsia or mucosa-associated lymphoid tissue lymphoma. The presence of cagA correlated with the presence of the vacA s1 allele (P < 0.05), whereas the presence of IS6...

background :the cag pathogenicity island includes a number of genes, including cytotoxin-associated protein a (caga) and vacuolatingcytotoxin (vaca) genotypes, which are associated with bacterial virulence. although the role of caga and vaca in the virulence of helicobacter pylori (h. pylori) is well-established in epidemiological studies, the relationship between the caga and vaca genotypes in...

For this study, we isolated Helicobacter pylori from wastewater by a series of steps beginning with immunomagnetic separation and cell culture. After Gram staining and three standard microbial tests, the 16S rRNA sequences of a total of 23 out of 37 putative H. pylori isolates were verified by PCR. Eleven H. pylori isolates were genotyped and fell into four vacA classes: those with the vacA all...

background :   vaculating cytotoxic a ( vaca ) gene is one of the multiple helicobacter pylori genotypes that produce a cytotoxin protein (vaca).this gene is a major cause of chronic peptic ulcers and gastric cancer. the aim of this study was to determine the correlation between vaca gene with peptic ulcer disease (pud) and non-ulcer dyspepsia (nud). methods :    this was a case control study o...

The VacA cytotoxin, produced by toxigenic strains of Helicobacter pylori, induces the formation of large vacuoles highly enriched in the small GTPase rab7. To probe the role of rab7 in vacuolization, HeLa cells were transfected with a series of rab mutants and exposed to VacA. Dominant-negative mutants of rab7 effectively prevented vacuolization, whereas homologous rab5 and rab9 mutants were on...