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今天天气-7℃至6℃,晴 北风2级左右转3、4级(阵风7级左右)明天天气晴间多云 北风2、3间4级(阵风6级),-4℃至3℃后天天气晴间多云 北风3级左右(阵风6级),-5℃至3℃气象信息由北京市专业气象台、中国气象网12月24日18时提供SourcePh" style="display:none"
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.”