نتایج جستجو برای: rdna sequences
تعداد نتایج: 220532 فیلتر نتایج به سال:
Gregarines are thought to be deep-branching apicomplexans. Accordingly, a robust inference of gregarine phylogeny is crucial to any interpretation of apicomplexan evolution, but molecular sequences from gregarines are restricted to a small number of small-subunit (SSU) rDNA sequences from derived taxa. This work examines the usefulness of SSU rDNA and beta-tubulin sequences for inferring gregar...
Real-time PCR methods with primers and a probe targeting conserved regions of the bacterial 16S ribosomal DNA (rDNA) revealed a larger amount of rDNA in blood specimens from healthy individuals than in matched reagent controls. However, the origins and identities of these blood-associated bacterial rDNA sequences remain obscure.
AIMS To examine bacterial contamination of passenger aircraft and to identify aeroplane environments posing the greatest potential health risk. METHODS AND RESULTS DNA was extracted from ten environmental samples collected on four different flights (three domestic, one international) from a variety of surfaces frequently touched by passengers. PCR clone libraries were made from the DNA sample...
Intraand interspecific variation of the nu clear ribosomal internal transcribed spacers (ITS) of 77 Smittium isolates and related genera was studied using RFLP. Due to the sequence and length varia tion encountered, the ITS is unsuitable for compar ison at the species level within Smittium, as presently delimited. Intraand interspecific variation of 18S rDNA was also analyzed. Cladistic anal...
Modern taxonomy of yeasts is mainly based on phylogenetic analysis of conserved DNA and protein sequences. By far the most frequently used sequences are those of the repeats of the chromosomal rDNA array. It is generally accepted that the rDNA repeats of a genome have identical sequences due to the phenomenon of sequence homogenisation and can thus be used for identification and barcoding of sp...
Paradinium and Paradinium-like parasites were detected in various copepod hosts collected in the NW Mediterranean Sea, the North Atlantic Ocean, and the Godthåbsfjord (Greenland). The identity and systematic position of the parasitic, plasmodial protist Paradinium was investigated on the basis of SSU rDNA and morphology. SSU rDNA sequences were obtained from 3 specimens of Paradinium poucheti i...
Arguably more mycophiles hunt true morels (Morchella) during their brief fruiting season each spring in the northern hemisphere than any other wild edible fungus. Concerns about overharvesting by individual collectors and commercial enterprises make it essential that science-based management practices and conservation policies are developed to ensure the sustainability of commercial harvests an...
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