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Credits: Image: Christine Daniloff, MIT Previous image Next image In recent years, scientists have developed many strains of engineered bacteria that can be used as sensors to detect environmental contaminants such as heavy metals. If deployed in the natural environment, these sensors could help scientists track how pollutant levels change over time, over a wide geographic area. MIT engineers have now devised a way to make this kind of deployment safer, by encasing bacterial sensors in a tough hydrogel shell that prevents them from escaping into the environment and potentially spreading modified genes to other organisms. “Right now there are a lot of whole-cell biosensors being developed, but applying them in the real world is a challenge because we don’t want any genetically modified organisms to be able to exchange genetic material with wild-type microbes,” says MIT graduate student Tzu-Chieh Tang, one of the lead authors of the new stu

Farren isaacsAbdul latif jameelHyunwoo yukTzu chieh tangXinyue liuTimothy luXuanhe zhaoAlexis rovnerKevin yehlYale school of medicineNational institutes of healthHarvard medical schoolNational science foundationInstitute for soldier nanotechnologiesDefense advanced research projects agencyUniversity of pennsylvania