平均值和中位数的背离,进一步印证了上述趋势——一方面,研发人员数量平均值由上年的722人提升至731 人;另一方面,研发人员的中位数却从上年的216 人降至213 人。这意味着,少数研发密集型企业大量增聘研发人员,多数中小型企业的团队规模维持稳定或略有收缩。
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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.