نتایج جستجو برای: زیرواحد urec
تعداد نتایج: 366 فیلتر نتایج به سال:
MOTIVATION Inferring species phylogenies with a history of gene losses and duplications is a challenging and an important task in computational biology. This problem can be solved by duplication-loss models in which the primary step is to reconcile a rooted gene tree with a rooted species tree. Most modern methods of phylogenetic reconstruction (from sequences) produce unrooted gene trees. This...
The complexity regarding Shiga toxin-producing Escherichia coli (STEC) in food safety enforcement as well as clinical care primarily relates to the current inability of an accurate risk assessment of individual strains due to the large variety in serotype and genetic content associated with (severe) disease. In order to classify the clinical and/or epidemic potential of a STEC isolate at an ear...
The hydrolysis of urea by urease enzyme of oral bacteria is believed to have a major impact on oral microbial ecology and to be intimately involved in oral health and diseases. To begin to understand the biochemistry and genetics of oral ureolysis, a study of the urease of Streptococcus salivarius, a highly ureolytic organism which is present in large numbers on the soft tissues of the oral cav...
BACKGROUND Escherichia coli O157:H7 strain 86-24 grown in MacConkey broth (MB) shows almost no adherence to cultured epithelial cells but adheres well in pig ligated intestines. This study investigated the mechanisms associated with the difference between in-vitro and in-vivo adherence of the MB culture. METHODOLOGY/PRINCIPAL FINDINGS It was found that decreased adherence in vitro by bacteria...
The model rumen Firmicutes organism Ruminococcus albus 8 was grown using ammonia, urea, or peptides as the sole nitrogen source; growth was not observed with amino acids as the sole nitrogen source. Growth of R. albus 8 on ammonia and urea showed the same growth rate (0.08 h(-1)) and similar maximum cell densities (for ammonia, the optical density at 600 nm [OD600] was 1.01; and for urea, the O...
Proteus mirabilis, a common agent of nosocomially acquired and catheter-associated bacteriuria, can cause acute pyelonephritis. In ascending infections, bacteria colonize the bladder and ascend the ureters to the proximal tubules of the kidney. We postulate that Proteus species uses the HpmA hemolysin and urease to elicit tissue damage that allows entry of these bacteria into the kidney. To stu...
Background and purpose: The expression of growth factors, proteolytic enzymes, fibrogenic factors, and cytokines are altered in Helicobacter pylori (H. pylori) infected gastric mucosa. Matrix metalloproteinases (MMP) are a family of zinc-dependent homologous enzymes digesting most of the components of the extracellular matrix and basement membrane and are involved in remodeling and functioning o...
Background and purpose: cagA, vacAs1 and babA2 in Helicobacter pylori are important virulence factors associated with gastrointestinal diseases. The prevalence of these genes and their association with gastrointestinal disease is different around the world. Materials and methods: In a cross-sectional study, 1500 patients with gastroduodenal disorders were enrolled. They attended Imam Khomeini ...
سابقه و هدف: عفونت H.pylori با گاستریت، زخم معده و دوازدهه مرتبط است. بنابراین شناسایی و درمان آن از اهمیت زیادی برخوردار است. هدف از این پژوهش تشخیص H.pylori با روش PCR و مقایسه آن با روشهای کشت و تست اوره آز سریع در بیماران مراجعهکننده به بیمارستان هاجر شهرکرد میباشد. مواد و روشها: این پژوهش یک بررسی مقطعی توصیفی است که بر روی 263 بیمار مراجعهکننده به بیمارستان هاجر شهرکرد در تابستان 13...
ارزش نانوایی در گندمهای هگزاپلوئید، صفت بسیار پیچیدهای در برنامة اصلاحی گندم است. زیرواحدهای گلوتنین با وزن مولکولی بالا نقش مؤثری در استحکام گلوتن و کششپذیری خمیر دارند. مکان ژنی glu-1 رمزکنندة این زیرواحدهاست که بر روی بازوی بلند کروموزومهای گروه یک قرار دارد. در این پژوهش از نشانگرهای dna مبتنی بر pcr در بهگزینی کیفی ارقام گندم استفاده شد. دو زوج آلل glu-d1یعنی 1dx5-1dy10 و 1dx2-1dy12 ب...
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