Toby Jenkins,a scientist in England,worked on the study.Jenkins and his colleagues developed a material that contains tiny capsules (胶囊).To a bacterium,these capsules look like cells just waiting to be damaged.The bacteria attack the cells by releasing poisons.But when the bacteria attack the capsules,the capsules fight back—by releasing antibiotics (抗生素)that knock out any nearby bacteria.

　　The material was tested on two types of harmful bacteria.When researchers placed pieces of the new material in a dish with the bacteria,the bacteria barely grew at all,which is unusual.This observation led the researchers to believe that the material really works.

　　The scientists want the bandages to work specifically against dangerous bacteria,so they also tested the material on a harmless type of E.coli bacteria.When the material was placed in a dish with E.coli,the bacteria grew quickly梥howing that it didn抰 foolll the harmless bacteria.This early experiment shows that the material can selectively kill dangerous bacteria,but it抯 too early to start using the material in hospitals.l

　　揟his is a nice approach and they抳e shown in principle that it works,?said Christopher Batich,a biomedical engineer in the US,who did not work on the study.While he抯 excited about the results,he added that the real world is more complicated than this exolllperiment.揧ou抎 have to work with real bacteria and real wounds to see if it makes a difference,?he said.al

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