Photograph: Simon Hill
However, Koch never credited the Hesses for their discovery of bacteriological agar, perhaps because, at the time, he failed to recognize its importance. Even after he received the insight about agar from the Hesses, Koch stuck with gelatine for years. In 1883-84, during his first medical expedition to Egypt and India to investigate cholera, he tried and failed to grow the cholera bacterium on gelatine media in the hot climate of Cairo (despite using a half-open fridge for incubation), only succeeding in the colder winter of Calcutta.，推荐阅读服务器推荐获取更多信息
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Unconsumed bodies: Pull semantics mean nothing happens until you iterate. No hidden resource retention. If you don't consume a stream, there's no background machinery holding connections open.
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