نتایج جستجو برای: ژن qnra
تعداد نتایج: 15967 فیلتر نتایج به سال:
Background and purpose: Plasmid-medicated quinolone resistance (PMQR) genes play an important role in resistance to quinolones. The aim of this study was to determine the frequency of PMQR genes in extended-spectrum β-lactamase-producing (ESBL) Escherichia coli. Materials and methods: This study was done on 240 isolates of E.­coli from urine samples of patients in Kermanshah, Iran. Th...
Background and Aim: Infection by drug resistant Pseudomonas aeruginosa causes important therapeutic problems. The present study was performed to investigate the antibiotic susceptibility and prevalence of antimicrobial resistance genes in P. aeruginosa. Materials and Methods: In this cross sectional study, 61 clinical P. aeruginosa isolates were collected in Sanandaj between April and September...
OBJECTIVES The aim of this study was to determine the prevalence and characteristics of qnr-carrying Salmonella isolates from humans in southern Taiwan. METHODS A total of 446 Salmonella isolates collected between 2003 and 2006 were screened for qnrA, qnrB and qnrS by PCR experiments. Genetic structures of qnr were determined by PCR-based methods or direct sequencing of plasmid DNA. RESULTS...
هدف: از چالشهای عمده بشریت افزایش افسردگی و اختلال عملکرد جنسی ناشی داروهای ضدافسردگی است. با توجه به نقش سلولهای سرتولی در اسپرماتوژنز، پژوهش حاضر، اثر داروی دولوکستین را بر زندهمانی، آپوپتوزیس بیان ژنهای Bax و (Connexin 43) Cx43 بررسی کرده مواد روشها: TM4 محیط DMEM/F12 حاوی %5/2 FBS، 5% سرم اسب %1 پنی سیلین-استرپتومایسین کشت شدند. دوزهای 30،60، 15، 5/7، 75/3 میکروگرم/ میلیلیتر زمانه...
The qnr genes are plasmid-borne fluoroquinolone-resistance determinants widespread in Enterobacteriaceae. Three families of qnr determinants (qnrA, B and S) have been described, but little is known about their expression and regulation. Two new determinants, qnrC and qnrD, have been found recently. Here, we describe the characterization of the qnrB2 promoter and the identification of a LexA-bin...
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