3月24日，北京市少年宫，学生科技节创客集市上，多所学校展示学生研发的主题文创产品。新京报记者 李木易 摄
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The change to agar was a marked improvement. The jelly is so effective that it is still an invariable ingredient in what is known today as the “Koch’s plating technique” or the “culture plating method.” As Koch himself noted in 1909: “These new methods proved so helpful…that one could regard them as the keys for the further investigation of microorganisms…Discoveries fell into our laps like ripe fruits.”