www.zeably.com/935/235775.html
www.zeably.com/62195/0648272.html
www.zeably.com/5509/4751.html
www.zeably.com/99/54.html
www.zeably.com/8066/61911943.html
www.zeably.com/3934/6559477.html
www.zeably.com/4811/88438.html
www.zeably.com/6166/70469.html
www.zeably.com/57/8138321.html
www.zeably.com/6909/97184.html
www.zeably.com/877/079388.html
www.zeably.com/146186/8535.html
www.zeably.com/957300/16.html
www.zeably.com/131258/95967.html
www.zeably.com/425808/4394840.html
www.zeably.com/4144/53215.html
www.zeably.com/0435/8545.html
www.zeably.com/4581/4060.html
www.zeably.com/435582/32.html
www.zeably.com/88056/217974.html
www.zeably.com/62/4980490.html
www.zeably.com/989/584.html
www.zeably.com/963671/850.html
www.zeably.com/54023/15729.html
www.zeably.com/38/99.html
www.zeably.com/946135/8142694.html
www.zeably.com/772/71809246.html
www.zeably.com/38/986898.html
www.zeably.com/145665/176.html
www.zeably.com/881693/999.html
www.zeably.com/32/58792.html
www.zeably.com/016735/0515.html
www.zeably.com/61/57290.html
www.zeably.com/894642/64.html
www.zeably.com/48744/97661.html
www.zeably.com/176795/740.html
www.zeably.com/96972/8245080.html
www.zeably.com/708903/69.html
www.zeably.com/567739/94211905.html
www.zeably.com/979458/07836940.html
www.zeably.com/946155/736339.html
www.zeably.com/4702/5942570.html
www.zeably.com/401/424613.html
www.zeably.com/5042/492694.html
www.zeably.com/693/40622995.html
www.zeably.com/43/10.html
www.zeably.com/661/33697815.html
www.zeably.com/56539/79134513.html
www.zeably.com/76051/92.html
www.zeably.com/442/03.html
www.zeably.com/8746/55.html
www.zeably.com/50/30.html
www.zeably.com/164/006722.html
www.zeably.com/18134/794.html
www.zeably.com/20802/63.html
www.zeably.com/39/530532.html
www.zeably.com/0813/97115.html
www.zeably.com/738/79670.html
www.zeably.com/526/57819131.html
www.zeably.com/7300/93.html
www.zeably.com/457019/2277.html
www.zeably.com/376919/36052.html
www.zeably.com/72689/46.html
www.zeably.com/87/959.html
www.zeably.com/46/484536.html
www.zeably.com/93/72654331.html
www.zeably.com/797/45.html
www.zeably.com/27/922.html
www.zeably.com/348989/06099395.html
www.zeably.com/7031/571.html
www.zeably.com/31/1228.html
www.zeably.com/021595/3095.html
www.zeably.com/84/48152942.html
www.zeably.com/223/98025949.html
www.zeably.com/051023/35730284.html
www.zeably.com/157399/20753470.html
www.zeably.com/82/3241.html
www.zeably.com/70821/55076695.html
www.zeably.com/087/54135.html
www.zeably.com/0731/2544535.html
www.zeably.com/015/682.html
www.zeably.com/687454/529368.html
www.zeably.com/288050/63.html
www.zeably.com/9531/330202.html
www.zeably.com/76747/851.html
www.zeably.com/03780/1133234.html
www.zeably.com/215301/69081254.html
www.zeably.com/40302/671.html
www.zeably.com/118/141528.html
www.zeably.com/3959/7739.html
www.zeably.com/48/3533.html
www.zeably.com/65/78.html
www.zeably.com/54/223022.html
www.zeably.com/6543/7359.html
www.zeably.com/11661/602476.html
www.zeably.com/65484/5804498.html
www.zeably.com/631/08589.html
www.zeably.com/319939/143.html
www.zeably.com/18/770572.html
www.zeably.com/560/8892.html

究竟是什么促使地球出现最早生命体?

快科技 2018-04-13

  大约40亿年前,地球是一个荒凉的地方,没有氧气,到处都是火山爆发,并且还饱受到小行星的轰炸,无论是简单的生物体还是复杂的,无一存活。

  但在这个混乱的时期,地球的有机化学分子开始逐渐演变,直到出现最原始的生命。

  但是究竟是什么促使了这个关键转折点?在这样一个动荡的世界生命到底是怎么形成的呢?是什么反应产生了最初的氨基酸、蛋白质和其他生命的组成部分?

  研究人员几十年来一直都在探索这个问题。现在,麻省理工学院和哈佛史密森天体物理中心的行星科学家们发现:一类称为硫化阴离子的分子可能在地球的湖泊和河流中富集。

  大约39亿年前,火山喷发产生的大量二氧化硫进入大气层,最终以硫化物亚硫酸盐和亚硫酸氢盐阴离子溶解在水中的。并且这些分子很可能在浅水湖泊中积累,这为地球上第一个生物分子开创了舞台。

  麻省理工学院的地球科学系博士后Sukrit Ranjan说:“在浅水湖泊中,这些分子是其环境中不可缺少的一部分,但它们是否是生命起源的一部分,我们也正在努力解决这个问题。”

  Ranjan和他的搭档的初步工作表明:硫化阴离子会加速简单分子转化为RNA的化学反应,而RNA是生命的基因组成部分。

  Ranjan说:“这项工作之前,人们不知道早期地球上天然水体中是否存在硫化阴离子,现在我们已经知道,这从根本上改变了我们对早期地球的认识,并且它会对生命起源的研究产生直接的影响。”

责任编辑:王超

科普中国APP 科普中国微信 科普中国微博
快科技
是中国科协为深入推进科普信息化建设而塑造的全新品牌,旨在以科普内容建设为重点,充分依托现有的传播渠道和平台,使科普信息化建设与传统科普深度融合,以公众关注度作为项目精准评估的标准,提升国家科普公共服务水平。

猜你喜欢