Transposition of the ampicillin-resistant transposon Tn3 was reproduced in vitro using the Escherichia coli cell extract. In this cell-free system, we used plasmid DNA carrying mini-Tn3 as donor and phage lambda DNA as target and assayed for ampicillin-resistance transducing phages formed by cointegration of these DNA molecules. Ampicillin-resistance transducing phages, which were obtained by i...

the aim of this study was to determine antibiotic resistance genes, phylogenetic groups and anti-microbial resistance patterns of escherichia coli isolates from fecal samples of healthy pet cats in kerman city. ninety e. coli isolates were recovered from obtained rectal swabs. antibiotic resistance pattern of the isolates against seven selected antibiotic was determined using disc diffusion met...

objective(s): macrolide resistant streptococcus pneumoniae pose an emerging problem globally. the aim of this study was to investigate the prevalence of ermb and mefa genes (macrolide resistant genes) by polymerase chain reaction (pcr) method and to detect drug resistance patterns of s. pneumoniae isolated from clinical samples to macrolides and other antibiotic agents by e-test method. materia...

resistance of 16 sugar beet cultivars to cercospora leaf spot was evaluated in ghaemshahr region. the experiment was conducted in a complete block design with six replications and disease severity of cultivars was measured two times. as a winter crop the root yield of cultivars and their disease severity compared under natural cercospora infection in dezfoul area in a complete block design with...

Disease resistance in animals is a field in which there has been relatively little investigation from the genetic point of view. With the development of more precise methods for laboratory control of diseases and of heredity, more critical experiments from the genetic standpoint are demanded of the animal pathologist. The experiments reported in this paper were planned to investigate the factor...

Five common tetracycline resistance genes tet(A), tet(B), tet(M), tet(O) and tet(S) were studied by polymerase chain reaction in 100 bacteria isolated from Iranian fish farms. In the antibiogram test most of the bacteria were either intermediately or completely resistant to tetracycline. Nine isolates out of 46 Aeromonas spp. contained eithe...

The evolution of corrosion morphology and kinetics for magnesium (Mg) have been demonstrated to be influenced by cathodic activation, which implies that the rate of the cathodic partial reaction is enhanced as a result of anodic dissolution. This phenomenon was recently demonstrated to be moderated by the use of arsenic (As) alloying as a poison for the cathodic reaction, leading to significant...