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تعداد نتایج: 16001 فیلتر نتایج به سال:
Salmonella infection of chickens that leads to potential human foodborne salmonellosis continues to be a concern. Changes in the pH of poultry gastrointestinal tract could influence Salmonella growth and virulence response. In the current study, growth responses of a chicken isolate Salmonella enterica serovar Typhimurium (ST) to three incremental pH-shifts (6.17-7.35) in continuous cultures (C...
During infection of mammalian hosts, facultative intracellular pathogens have to adjust rapidly to different environmental conditions encountered during passage through the gastrointestinal tract and following uptake into epithelial cells and macrophages. Successful establishment within the host therefore requires the coordinated expression of a large number of virulence genes necessary for the...
سابقه و هدف: سالمونلا به عنوان عامل شایع بیماریهای گوارشی که از طریق مواد غذایی و محصولات آلوده منتقل میشود، سالیانه موارد بسیار زیادی از بیماری و مرگ و میر را موجب میشود. تشخیص مولکولی سالمونلا به روش PCR برای بسیاری از محصولات حیوانی مورد استفاده قرار گرفته، ولی در موارد کمی برای ردیابی آن در محصولات کشاورزی ساده از این روش بهره گیری شده است. گوجه فرنگی به عنوان یکی از محصولات کشاورزی که ...
A morphologically distinct isolate of Cladosporium sphaerospermum from a North American patent collection, referenced as Cladosporium lignicola in the patent, was examined. Generic affinity was confirmed by scanning electron microscopic examination of conidiogenous loci and conidial hila. Species identity as C. sphaerospermum was indicated by DNA sequence data derived from actin and translation...
Signature-tagged mutagenesis is a functional genomics approach to identify bacterial virulence genes by simultaneously screening multiple mutants in a single host animal. Avirulent (attenuated) mutants are identified by negative selection (failure to colonize the host). The method was recently developed to investigate Salmonella typhimurium in a mouse model of human typhoid fever. We modified t...
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