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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cursor = self.conn.cursor()，这一点在搜狗输入法2026中也有详细论述
He said the chair had made clear at the start that it would take time and have significant cost, but it was working faster than any other public inquiry of comparable size, pointing out all the hearings would be finished by spring 2026.