科学美国人60秒:特殊杀虫剂研制-托福听力下载

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　　科学美国人60秒中英文翻译：特殊杀虫剂研制

　　科学美国人60秒英文文本

　　An honest error has led to promising research into the development of species-specific insecticides.

　　The account is in the journal Nature Communications.

　　A team of Johns Hopkins scientists study sodium channels responsible for electrical signaling in nerve cells from humans and from cockroaches.

　　Spider venom protein messes with these sodium channels—that’s why venom is dangerous.

　　So the researchers use spider venom protein to disrupt the channels and thus clarify exactly how the channels function.

　　杀虫剂.jpg

　　The researchers recently asked for venom protein samples from Australian collaborators.

　　And the Aussies accidentally included a spider venom protein that has no effect on humans or American cockroaches.

　　In their tests, the Hopkins researchers found when sodium channels from German cockroaches were exposed to the mistakenly included sample, their activity skyrocketed, enough to cause death-inducing seizures.

　　Intrigued that the American roach sodium channel laughed off the venom that would kill the German roach, the scientists found a key region on the two species'channels that differed by only two amino acids.

　　The scientists say the information could help with the creation of insecticides that target one harmful insect species without hurting beneficial ones, like bees.

　　As the study authors note: The more specific a toxin's target, the less dangerous it is for everything else."

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