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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这不仅仅是亲切的自我介绍，更是对全党同志的躬身垂范，是对全国各族人民的庄严承诺。，详情可参考safew官方版本下载
Stronger-than-expected job gains in January could be a sign that hope is on the horizon for job seekers.