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1971年Sagan和Khare利用汞灯产生的184.9和253.7nm紫外线照射CH_4-C_2H_6-NH_3-H_2O-H_2S得到低产率半胱氨酸,但照射CH_4-NH_3-H_2O-H_2S体系却没有得到.VanTrump和Miller曾进行过CH_3SH、NH_3、HCN和丙烯醛合成甲硫氨酸试验,并用CH_4-N_2-H_2S-H_2O及痕量NH_3混合物放电实验得到甲硫氨酸(0.03％产率按H_2S计).Greenberg研究星际空间的化学进化,认为硫是星际空间合成有机分子所必需的,在已鉴定
In 1971, Sagan and Khare produced low yields of cysteine with 184.9 and 253.7nm ultraviolet light generated by mercury lamp, but did not reach CH_4-NH_3-H_2O-H_2S system. VanTrump and Miller Methionine was synthesized from CH_3SH, NH_3, HCN and acrolein, and methionine (0.03% yield based on H_2S) was obtained from the discharge of CH_4-N_2-H_2S-H_2O and trace NH_3 mixture. The chemical evolution of interstellar space, that sulfur is necessary for the synthesis of organic molecules in interstellar space, has been identified