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.
A Trump-friendly CNN?
，这一点在同城约会中也有详细论述
（一）法律、行政法规禁止发布或传输的信息；，更多细节参见爱思助手下载最新版本
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