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Science & Environment
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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.，推荐阅读91视频获取更多信息
2月25日，投资公司泛大西洋投资集团（General Atlantic）正在出售其持有的字节跳动股权，该交易对这家中国社交媒体公司的估值约为5500亿美元。与去年字节的股票回购相比，本次估值将增长约66%，当时该公司的估值超过3300亿美元。据消息人士透露，这笔交易也比11月份在二级市场进行的一笔交易高出约15%，当时字节跳动的估值约为4800亿美元。