豆科蔓黄耆属Phyllolobium及其属下组的分类

蔓黄耆属Phyllolobium,是基于黄耆属Astragalus簇毛黄耆亚属subgen.Pogonophace的一个提升属,虽然沿用了Fisher1818年的Phyllolobium属名称,但完全不是早先其仅一种的分类涵义和范畴.对这个类群的来龙去脉做了必要的说明.基于ITS分子系统发育分析,结合形态分类,对属下组的分类等级做了处理.     

Origin of organic molecules and biomolecular homochirality

Theories about the origin of biomolecular homochirality, which seems to be a prerequisite for the creation of life, are discussed. First, possible terrestrial and extraterrestrial sources of organic molecules are outlined. Then, mechanisms for the formation of enantiomerically enriched compounds and for the amplification of their chirality are described.