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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.
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这家企业的负责人告诉记者，按行业共识与团体标准，柑皮需陈化三年以上才可称为陈皮，陈化时间越长价值越高，但他透露，自然陈化需长期积压资金，多数企业是难以承受的。