It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.
Everstine is the technical director of food safety solutions at FoodChain ID, a company that advises food-sector clients.
，这一点在safew官方下载中也有详细论述
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