This was especially vexing to physician and bacteriologist Robert Koch, who, in seeking to culture his bacteria, “bent all his power to attain the desired result by a simple and consistently successful method,” wrote bacteriologist and historian William Bulloch in his 1938 book, The History of Bacteriology. “He attempted to obtain a good medium which was at once sterile, transparent, and solid” and got some results with gelatine.6 But gelatine is easily digested by many microbes and melts at precisely the temperatures at which the disease-causing microbes Koch wanted to study grow best.
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一是“爱心账本”。北京一家拉面馆里，小黑板上的“爱心账本”记录着不断刷新的存面数量。为谁存面？“当你遇到困难时，可以在这免费吃一碗热腾腾的面。”这家店从开业起，就把这句话贴在门口。于是，有人吃完面，会默默多付一碗钱；有人特意从远处赶来，只为存上几碗。
Microsoft Fabric