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.
4. 暖心服务：编织毯子等手工艺品，分发给患者；带经过认证的宠物（比如一只叫JoJo的蝴蝶犬）探望患者，帮老人缓解情绪、促进康复。
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