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.
▲生成提示词：一张关于中国传统功夫茶道设计精美的垂直信息图。中国传统水墨画背景。顶部有巨大的、优雅的中文书法标题，明确写着「功夫茶」。向下有三个图文并茂的步骤：步骤 1 展示用沸水温杯，配有中文「温杯」；步骤 2 展示将茶叶放入盖碗，配有中文「投茶」；步骤 3 展示倒出茶汤，配有中文「出汤」。优雅、极简、温暖的大地色调，平衡的布局。，更多细节参见51吃瓜
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