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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当然，还有24 个行业加大了研发投入力度——包括排名领跑的四大行业。其中，汽车制造业的表现尤为突出——在披露研发企业数量微增3%的情况下，研发投入同比增幅达到17.29%，排名也从上年第五跃至第三。
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In its most recent third quarter report, Reddit reported 116 million daily active users worldwide, an increase of 19% compared to the same period the year before.