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  1. ...a very long time and different species should be appear in different time, 2008-12-12 22:26:10 補充: and this has...補充: Fossil record can only shows that a particular species was on the earth at some time, but what...

    分類:科學及數學 > 生物學 2008年12月21日

  2. ...genus Streptomyces. With advances in organic chemistry many antibiotics are now also...specificity: "narrow-spectrum" antibiotics target particular types of bacteria, such as Gram-negative...

    分類:科學及數學 > 生物學 2007年09月20日