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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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"We value the hard work and dedication of the drivers who deliver great service and products to our customers," the company said in a statement.
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二是优化生物样本采集要求。更新了监测人群的确定原则,新增了生物安全、采样空白、样本分装、样本接收、样本入库等关键环节的质量控制要求,并对血样和尿样的采集方式进行了调整优化,同时删减了脂肪、粪便、呼出气及其他组织等样本采集的相关内容。