美国科学60秒 SSS 2013-06-24（在线收听）

 　　The limpidness lettuce still has a little life left,a new study finds that produce continue to respond to life kills which enable them to keep protecting themselves from insects,and perhaps even enhance their nutritional value to us.Scientists knew that favor test plant called arabidopsis has strong circadian rhythms.Expose arabidopsis to a set light-dark cycle,and it produces more entrainable chemicals when it`s left,which fights off insects living on the same life schedule.In the new study ,researchers try to let dark test with storable cabbage leaves,the leaves that were on the same dark cycle as hungry insects protect themslves more effectively than leaves on cycles out of sick.Other veges and fruits such as kiwis and blueberrys has the samilar responses,the study is in the Journal Current Biology.The research suggested we try to harvest and preserve prodottos when it`s  levels of entrain inside chemicals are highest to help resist damage,some of those compounds also reduce cancer risk,so we may in hands all help as well.Sir,Kiwi enough tea!