نتایج جستجو برای: rrna gene
تعداد نتایج: 1153532 فیلتر نتایج به سال:
Background and purpose: Helicobacter pylori is a gram-negative, micro-aerophilic, and spiral-shaped bacillus. Infection with this bacterium can lead to gastritis, ulcers, and even gastric cancer. This study was conducted to evaluate the presence of the cagA gene among patients with gastritis and gastric cancer. Materials and methods: This study was performed in patients with gastritis (n=40) a...
Phylogenetic diversity--patterns of phylogenetic relatedness among organisms in ecological communities--provides important insights into the mechanisms underlying community assembly. Studies that measure phylogenetic diversity in microbial communities have primarily been limited to a single marker gene approach, using the small subunit of the rRNA gene (SSU-rRNA) to quantify phylogenetic relati...
A pair of new universal 12S mitochondrial rRNA gene primers was designed through multiple alignment analysis of the mitochondrial tRNA(Phe) and the 5' region of 16S mitochondrial rRNA genes of different kinds of fishes. The primers were successfully used to amplify an expected product fragment of about 1.2 kb from various marine fish species, and the amplified DNA fragment was recognized to con...
A mutant strain of Escherichia coli was created by inserting a cassette encoding sucrose sensitivity and neomycin resistance (sacB-neo) into the small-subunit rRNA-encoding gene rrs in the rrnB operon. During growth in a complex medium, the cassette was lost from the population, and a complete rrs gene was restored at a rate of 5 x 10(-9) per cell division. Repair of this lesion required flanki...
The organisation of the mitochondrial ribosomal RNA genes in maize is described. Each of the rRNAs is encoded by a single gene. The 5S and 18S rRNA genes are close together, and separated from the 26S rRNA gene by 16 kb of DNA. There is no evidence of heterogeneity in this gene arrangement.
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