习近平总书记始终以伟大的历史主动精神，带领全党进行具有许多新的历史特点的伟大斗争，激励广大党员干部挺起脊梁、冲锋在前，在战风险、迎挑战中经受考验，在直面问题、破解难题中开创新局。
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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A bundle of kanten, from the Encylopedia of Food (1923).