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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.，更多细节参见51吃瓜
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Mandatory registration creates friction and barriers to entry, particularly for:
В России ответили на имитирующие высадку на Украине учения НАТО18:04，这一点在heLLoword翻译官方下载中也有详细论述
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