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.
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if the free list is scavanged. the general strategy is:
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一名女子站在尖东大富豪夜总会外的街边（图：南方人物周刊记者 方迎忠）