the genetics and mechanism of malathion resistance in the adults of an. stephensi (ban-s), was studied. nine successive generations of malathion selection in the adults resulted in an increase in ltso of about 3-fold. the crossing experiments indicated that the resistance is inherited as partially dominant character with no indication of sex linkage. the results of back-crosses suggested that p...

background: clarithromycin resistance in helicbacter pylori has been found to be associated with point mutations in 23s rrna gene leads to reduced affinity of the antibiotic to its ribosomal target or changing the site of methylation. the aim of this study was to determine the most important point mutations in 23s rrna gene in h. pylori that are closely related to clarith-romycin resistance amo...

the miru-vntr polymorphism and katg463 mutation are used to genotype the mycobacterium tuberculosis, but the correlation between them and inh-resistance were unknown. this study was aimed to explore whether etre polymorphism and katg463 mutation could predict the inh-resistance, and the relationship between etre polymorphism and katg463 mutation.the etre, katg463 mutation and drug resistance in...

materials and methods the l. tropica strain was attenuated using continuous passaging 20 times. the infectivity of l. tropica was confirmed in balb/c mice. the l. tropica resistant strain was produced in vitro using a continuous increase in drug pressure. the cross resistance of l. tropica to other drugs was also investigated. results after 20 continuous passages, the balb/c mice tested negativ...

conclusions antibiotic resistance gene cassettes may be carried on integron or other genetic elements. the purpose of this study was to detect integron or genomic islands involved in antibiotic resistance profile of the isolates of h. influenzae collected in this study. results of the twenty isolates, all (100%) were resistant to clindamycin, chloramphenicol and tetracycline, 95% to amoxicillin...

tuberculosis remains a major public health problem in both developing and developed countries. drug-resistant tuberculosis is an increasing health problem and serious challenge to tuberculosis (tb) control programs. information about the susceptibility pattern of mycobacterium tuberculosis isolates against anti-tuberculosis drugs is an important aspect to tb control. the objectives of the study...

to evaluate general and specific combining ability for resistance to bolting and cercospora leaf spot, 36 hybrids derived from crosses between 9 sugar beet lines along with four checks were planted in safiabad agricultural research center (dezful) in 2008-2009. the experimental design was a triple lattice design with three replications. analysis of variance showed significant differences among ...

knowledge of airflow resistance is an important consideration in designing an appro-priate ventilation system and for proper fan selection. an airflow resistance device was designed and fabricated to measure the airflow resistance of potatoes. the device the composed of an air compressor, a rotameter, a cylindrical bin to contain the potatoes and an inclined u-tube manometer. airflow resistance...

the aim of the present study was to investigate the response of plasma visfatin to resistance exercise intensity and its relationship with insulin resistance, growth hormone and il-6. after familiarization and determining their maximum strength (1-rm), 15 healthy young subjects (age: 26.2±4.1 yr, weight: 75.1±9.1 kg) performed three resistance exercise sessions at intensities of 30%, 55% and 80...