上游充通大￥ Shanghai Jiao Tong Unive Hydrocyanic氰氢的Acid In the HCN world,HCN polymer came first,giving rise simultaneously to polypeptides and polynucleotides,precursors of proteins(enzymes)and nucleic acids (both DNA and RNA). This is an argument from abundance,given the ease of formation in our Milky Way Galaxy both of HCN and its polymers.It seems,then,that primitive Earth,perhaps a billion years old,became covered with HCN polymers,as well as other organic compounds,through bombardment or by photochemical reactions in the atmosphere.In an aqueous reducing environment,life emerged from this vital dust,woven out of air by light (Metthews,2004).Shanghai Jiao Tong University In the HCN world, HCN polymer came first, giving rise simultaneously to polypeptides and polynucleotides, precursors of proteins (enzymes) and nucleic acids (both DNA and RNA). This is an argument from abundance, given the ease of formation in our Milky Way Galaxy both of HCN and its polymers. It seems, then, that primitive Earth, perhaps a billion years old, became covered with HCN polymers, as well as other organic compounds, through bombardment or by photochemical reactions in the atmosphere. In an aqueous reducing environment, life emerged from this vital dust, woven out of air by light (Metthews, 2004). Hydrocyanic氰氢的 Acid