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1.
石磊 《世界科学》2007,(3):16-17
微生物世界正在浮现出的一幅画面——微生物可以认为是基因交换的集合体——要求人们对一些概念(如生物体、物种,甚至进化本身)进行修正。  相似文献   

2.
Funded by the National Natural Science Foundation of China and Chinese Academy of Sciences (CAS), Dr. He Shenggui and his colleagues from Institute of Chemistry, CAS, investigated the mecha- nisms for low-temperature (LT) transformations of very stable molecules with a bottom-up strategy: they systematically generated atomic clusters composed of different numbers of atoms and different kinds of ele- ments and observed the cluster reactivity toward small molecules at room temperature (RT) by home-made mass spectrometers under isolated, controlled, and well reproducible conditions.  相似文献   

3.
玉,作为一种温润光泽、质地细腻而坚韧的天然矿物集合体,在全世界有着较广泛的分布。中华民族自古就有深刻的玉文化情结,在中国人的心目中,玉早已超越了其自然矿物的属性,成为渗透至人们内心深处,影响着人们思维方式,寄托着人们特殊心理情感的一种文化载体。在汉语中,结合“玉”的词语。  相似文献   

4.
Two-dimensional chirality of molecular assembly on solid surfaces has gained wide spread interest for its fundamental significance and potential applications in enantioselective heterogeneous catalysis,chiral separation,chiroptical materials and sensors.A variety of chiral molecular assemblies have been acquired on solid surfaces from chiral or achiral molecules.However,the origin,transfer,  相似文献   

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