Identification of a chromosomal gene controlling temperature-regulated expression of Shigella virulence.

Identification of a chromosomal gene controlling temperature-regulated expression of Shigella virulence.

Genes required for the full expression of Shigella virulence are on both the chromosome and a large virulence-associated plasmid. Expression of one or more virulence (vir) genes is temperature-regulated, wild-type strains being virulent (invasive) when grown at 37 degrees C but phenotypically avirulent (noninvasive) at 30 degrees C. A vir::lac operon fusion located on the virulence plasmid, whi...

Temperature-regulated expression of outer membrane proteins in Shigella flexneri

BACKGROUND Bacteria exist widely in a diversity of natural environments. In order to survive adverse conditions such as nutrient depletion, biochemical and biological disturbances, and high temperature, bacteria have developed a wide variety of coping mechanisms. Temperature is one of the most important factors that can enhance the expression of microbial proteins. This study was conducted to i...

Regulator of Shigella Virulence

Virulence in Shigella spp., as well as in strains of enteroinvasive Escherichia col, is regulated by growth temperature. Previously, virR had been identified as the gene controlling the temperature-regulated expression of Shigella virulence. Since ShigeUa spp. and E. coli are also known to share >90% DNA sequence homology, we sought to determine if nonpathogenic E. coli K-12 C600 contains a gen...

Regulatory networks controlling Vibrio cholerae virulence gene expression.

a comparison of linguistic and pragmatic knowledge: a case of iranian learners of english

در این تحقیق دانش زبانشناسی و کاربردشناسی زبان آموزان ایرانی در سطح بالای متوسط مقایسه شد. 50 دانش آموز با سابقه آموزشی مشابه از شش آموزشگاه زبان مختلف در دو آزمون دانش زبانشناسی و آزمون دانش گفتار شناسی زبان انگلیسی شرکت کردند که سوالات هر دو تست توسط محقق تهیه شده بود. همچنین در این تحقیق کارایی کتابهای آموزشی زبان در فراهم آوردن درون داد کافی برای زبان آموزان ایرانی به عنوان هدف جانبی تحقیق ...