Two acetylcholinesterase (AChE) genes cDNA fragments,Ag.acel and Ag.ace2,have been cloned from cotton aphid,Aphis gossypii Glover using degenerate primers with RT-PCR technique.Ag.acel gene cDNA fragment is of 282?bp ...Two acetylcholinesterase (AChE) genes cDNA fragments,Ag.acel and Ag.ace2,have been cloned from cotton aphid,Aphis gossypii Glover using degenerate primers with RT-PCR technique.Ag.acel gene cDNA fragment is of 282?bp encoding 94 amino acids,and Ag.ace2 gene cDNA fragment is of 264?bp encoding 88 amino acids.Both two putative AChE genes cDNA fragments share numerous similarities with those cloned from other insects.This is the first report of two AChE cDNA fragment sequences in the insect species,which provided the direct evidence of multiple AChE existence in insects.展开更多
1 Skateboarder Robert Glovers skateboarding skills are truly remarkable,but what sets him apart is his unique style that is out of expectations.2 Born with a condition called sacral agenesis(骶骨发育不全症),which prev...1 Skateboarder Robert Glovers skateboarding skills are truly remarkable,but what sets him apart is his unique style that is out of expectations.2 Born with a condition called sacral agenesis(骶骨发育不全症),which prevents the growth of his legs,Mr Glover relies on his upper body strength to navigate his skateboard.Rather than relying on legs like most skateboarders,he skillfully controls the board using his arms and torso(躯干).展开更多
为筛选出对棉蚜高效的药剂品种,选用了6种杀虫剂对棉花苗期棉蚜进行田间药效评价。试验结果表明:20%氟啶虫酰胺悬浮剂和50 g/L双丙环虫酯可分散液剂对棉蚜的速效性和持效性均较好,药后1 d仿效即可达到>88%,药后14 d防效仍能保持在>...为筛选出对棉蚜高效的药剂品种,选用了6种杀虫剂对棉花苗期棉蚜进行田间药效评价。试验结果表明:20%氟啶虫酰胺悬浮剂和50 g/L双丙环虫酯可分散液剂对棉蚜的速效性和持效性均较好,药后1 d仿效即可达到>88%,药后14 d防效仍能保持在>95%;20%吡虫啉可分散液剂速效性好,但持效性较差,持效期仅有7 d;20%环丙氟虫胺悬浮剂速效性和持效性均表现一般;50%吡蚜酮水分散粒剂对棉蚜防效最差。20%氟啶虫酰胺悬浮剂75 g a.i./hm^(2)、50 g/L双丙环虫酯可分散液剂7.5 g a.i./hm^(2)或12 g a.i./hm^(2)均可有效防治苗期棉蚜。展开更多
文摘Two acetylcholinesterase (AChE) genes cDNA fragments,Ag.acel and Ag.ace2,have been cloned from cotton aphid,Aphis gossypii Glover using degenerate primers with RT-PCR technique.Ag.acel gene cDNA fragment is of 282?bp encoding 94 amino acids,and Ag.ace2 gene cDNA fragment is of 264?bp encoding 88 amino acids.Both two putative AChE genes cDNA fragments share numerous similarities with those cloned from other insects.This is the first report of two AChE cDNA fragment sequences in the insect species,which provided the direct evidence of multiple AChE existence in insects.
文摘1 Skateboarder Robert Glovers skateboarding skills are truly remarkable,but what sets him apart is his unique style that is out of expectations.2 Born with a condition called sacral agenesis(骶骨发育不全症),which prevents the growth of his legs,Mr Glover relies on his upper body strength to navigate his skateboard.Rather than relying on legs like most skateboarders,he skillfully controls the board using his arms and torso(躯干).
文摘为筛选出对棉蚜高效的药剂品种,选用了6种杀虫剂对棉花苗期棉蚜进行田间药效评价。试验结果表明:20%氟啶虫酰胺悬浮剂和50 g/L双丙环虫酯可分散液剂对棉蚜的速效性和持效性均较好,药后1 d仿效即可达到>88%,药后14 d防效仍能保持在>95%;20%吡虫啉可分散液剂速效性好,但持效性较差,持效期仅有7 d;20%环丙氟虫胺悬浮剂速效性和持效性均表现一般;50%吡蚜酮水分散粒剂对棉蚜防效最差。20%氟啶虫酰胺悬浮剂75 g a.i./hm^(2)、50 g/L双丙环虫酯可分散液剂7.5 g a.i./hm^(2)或12 g a.i./hm^(2)均可有效防治苗期棉蚜。
