Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.
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“It is always best to err on the side of caution until you are very clear on the purpose and culture of the group,” Wesson said.。业内人士推荐safew官方下载作为进阶阅读
He challenged the California court's out-of-state subpoena, which he believed was compelling him to travel against his will.