| company amplification of estalpha2/estbeta2 and correlation between esterase gene copy number and resistance to insecticides in the field culex pipiens pallens strains collected from beijing, china. | seven field strains of culex pipiens pallens were evaluated in the summer of 2004 for their susceptibility to three insecticides. larval bioassays were carried out in accordance with who mosquito susceptibility tests. field samples showed resistance to dichlorvos and propoxur. low levels of resistance to phoxim were detected compared with the laboratory-susceptible strain. quantitative analysis showed that co-amplification of estalpha2 and estbeta2 occurred in the seven field cx. pipiens pallens ... | 2009 | 19496425 |
| dynamics of esterase alleles in culex pipiens complex mosquitoes in beijing. | to investigate insecticide resistance levels and dynamic changes of carboxylesterase polymorphism with time in resistant populations of mosquitoes in the culex pipiens complex, four field populations were collected in september 2006. the resistance levels of fourth-instar larvae to organophosphate (dichlorvos, parathion, and chlorpyrifos), carbamate (fenobucarb and propoxur), and pyrethroid (permethrin and tetramethrin) insecticides were determined by bioassay. larvae had a low but significant r ... | 2008 | 19133472 |
| [genetic diversity of isoenzyme in culex pipiens complex field populations sampling from distinct area of china]. | eight field populations of culex pipiens complex collected from five provinces (guangdong, henan, shandong, beijing and yunnan) in 2001 were used to study genetic diversity by starch gel electrophoresis. data from seven loci (me,mdh-1,mdh-2,mdh-3,gpd,est-2,est-3) of four isozymes were analyzed by software biosys2.0 and fstat(version 2.9.3). the results were as follows: (1) the values of he (from 0.098 to 0.41) indicated genetic variabilities of different degree in populations.(2)the low level of ... | 2004 | 15639982 |