نتایج جستجو برای: a 355 bp fragment was amplified from s
تعداد نتایج: 14809709 فیلتر نتایج به سال:
abstract deviation or in other words committing a crime is literally a social problem. this research that was conducted in 1389 and 1390 has tried to investigate the causes of crimes committed by young male inmates qazvin central prison and effective variables on their tendency to deviation. accordingly after collecting theoretical framework and offering theoretical model including both hirsch...
Background: Zoonotic cutaneous leishmaniasis (ZCL) is a polymorphic disease which may show various clinical manifestations. Although genetic variability of the parasite is suggested to be one of the factors influencing clinical manifestations in leishmaniasis, no data exist regarding genetic polymorphism of Leishmania major. Therefore, determination of genetic variation within the species of L....
Background and purpose: Enteropathogenic Escherichia coli from Enterobacteriaceae family is one of the most common causes of chronic diarrhea in children and infants. Polymerase Chain Reaction (PCR) method is commonly used for detection of enteropathogenic Escherichia coli species, but there are some disadvantages with this method due to the use of gel electrophoresis and staining with ethidium...
this study attempts to investigate the effect of peers’ revision in comparison to that of the teacher, and whether peers’ comments and teachers’ comments facilitate students’ revision? if yes, which one is more effective? also attempts have been made to see which aspects of language are more highlighted by peers versus teachers when commenting. besides, it is investigating the student’s attitud...
background: the advent of recombinant dna technology has facilitated heterologous expression of proteins from various sources in different host systems including escherichia coli. if a plant virus coat protein is expressed in the bacterium it can be used as the antigen for antibody preparation. such a recombinant antigen preparation can be particularly useful where equipment such as ultracentri...
PCR was used to identify penicillin resistance in 1,062 clinical isolates of Streptococcus pneumoniae. Three sets of primers were designed to amplify (i) a 240-bp fragment of the penicillin-binding protein (PBP) 2B gene (pbp2b) of penicillin-susceptible S. pneumoniae (PSSP), (ii) a 215-bp fragment of the class A mutations of the pbp2b gene present in penicillin-resistant S. pneumoniae, and (iii...
the present study was an attempt to compare the effect of peer metalinguistic corrective feedback on elementary and intermediate efl learners speaking ability to see which level benefits more from this type of feedback. to this end, 117 female efl learners at grade 3, al-zahra high school in kermanshah, iran were non-randomly chosen. the homogeneity of the participants was attained through a pi...
to characterize the distribution of melanin producing medicago-nodulating rhizobia in western and north-western of iran, 982 sinorhizobium isolates were trapped from a combination of three alfalfa populations (hamedani, nikshahri, kodi) and soil samples from eight sites across kurdestan, kermanshah, eastern azarbayjan and lorestan provinces. all rhizobial isolates were examined for their abilit...
A technique combining PCR and restriction fragment length polymorphism analysis was used to generate specific DNA fragment patterns from spore extracts of arbuscular mycorrhizal fungi. With the universal primers ITS1 and ITS4, DNA fragments were amplified from species of Scutellospora and Gigaspora that were approximately 500 bp long. The apparent lengths of the corresponding fragments from Glo...
Anopheles pulcherrimus Theobald has a wide distribution in western Asia and is a potential vector of malaria in Iran. We have examined the rDNA-ITS2 (internal transcribed spacer 2) region of An. pulcherrimus specimens collected during the two peaks of activity (May-June and October-November) from Sistan and Baluchistan province, southeastern Iran. There were no consistent differences between sp...
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