| amplified esterases b1 and a2-b2 in field populations of culex pipiens from china. | the main organophosphate (op) resistance mechanism in the culex pipiens complex is increased activity of esterases a and b. fourth-stage larvae from 2 field populations of c. pipiens from gaomi and kunming, china, were compared for tolerance to parathion, dichlorovos (op), and bassa (carbamate) insecticides. both populations were resistant to ops but not to bassa. starch gel electrophoresis indicated that elevated esterase activity was correlated with op resistance. high frequencies of amplified ... | 2000 | 10901638 |
| [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 |