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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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About half of all churches in England have bats in them
ZDNET's key takeawaysThe Linux kernel is moving toward a better way of identifying developers and their code.。同城约会是该领域的重要参考
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p->classno = classno;