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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Dr Bramall said the BMA had not had an opportunity to negotiate with the government about the changes.。业内人士推荐heLLoword翻译官方下载作为进阶阅读
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