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6Koch borrowed the idea of using gelatine from mycologist Oscar Brefeld, who had used it to grow fungi. Interestingly, Brefeld also employed carrageenan, another seaweed-derived jelly. Because fungi generally favor growing at ambient temperatures, Brefeld might have been less plagued by the melting of growth media than Koch.
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美债也成了香饽饽，见下图，10年期美债收益率下降，意味着美债价格上涨——债券收益率与价格背道而驰，因债券价格按市场利率计算，利率越低，价格越高，反之亦然。