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It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.
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默茨表示，很高兴在中国农历马年春节之际，携重量级企业家代表团访华，这充分表明德方对深化德中经贸关系的高度重视和期待。德中两国相距遥远，但经济联系紧密，合作潜力巨大。德方愿本着坦诚开放精神，同中方加强高层交往，保持各领域常态化对话，推动双边经贸关系均衡、持续发展，促进绿色转型、应对气候变化等领域合作。德方愿同中方加强沟通协调，共同倡导多边主义和自由贸易。德方愿为推进欧中关系发展发挥积极作用。。safew官方版本下载对此有专业解读