STUDIES OF ESTERASE GENE AMPLIFICATION IN ORGANOPHOSPHATE RESISTANT CULEX PIPIENS COMPLEX FROM AMERICA AND CHINA*

Abstract Pulsed-field gel electrophoresis analysis of Beijing and Californian populations of Culex pipiens complex mosquitoes revealed that the enzyme Mlul produced a band of 49kb. This probably is one whole amplification unit, the largest fragment found so far in the mosquitoes. The method for the preparation of large DNA molecules was described and the electrophoretic condition for the separation of large DNA molecules is discussed.