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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（七）利用职务上的便利收受他人财物或者谋取其他利益的；
After their initial degree and the mandatory two years of post-graduate foundation training, many choose to specialise in a particular area of medicine or surgery.