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.
Anglo-Saxon spindle whorl，详情可参考WPS下载最新地址
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结合一位资深职业加盟商的总结，这种困境的出现，主要源于三个致命陷阱，也是很多门店最终闭店的关键原因：