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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=10207&size=small" /></div> <h1 class="ph">NASA发现生命新可能 砷元素或能形成生命体 </h1> <p class="xg1"> 时间：2010-12-3 17:03<a class="zz" href="home.php?mod=space&uid=10207">作者：乏味</a> 阅读<em id="_viewnum">(1289)</em> 评论: 0</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>砒霜(三氧化二砷)里面的砷元素有可能成为生命的组成元素，美国科学家的这一发现将改变对于生命的定义，生命存在的新可能由此产生。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><P>砒霜(三氧化二砷)里面的砷元素有可能成为生命的组成元素，美国科学家的这一发现将改变对于生命的定义，生命存在的新可能由此产生。<BR> <BR>《纽约时报》12月2日报道称，美国宇航局(NASA)天体生物学家费丽莎·乌尔夫-西蒙(Felisa Wolfe-Simon)，将从加利福尼亚州莫纳湖(Mono Lake)湖底收集而来的微生物，置于实验室含有砷的混合试剂内培殖了数月，结果发现微生物体内的磷原子被砷原子置换出来了。<BR> <BR>乌尔夫-西蒙表示，每天去实验室的时候都会摒住呼吸，生怕这些微生物会死去，但它们没有。<BR> <BR>科学家说，如果这一结果被确认，那么“生命及生命存在于何处”的定义将被扩大。</P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/03/1700503ukebj3mkmj5mncx.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/03/1700503ukebj3mkmj5mncx.jpg"></A></P> <P>壹剧毒砷生长的菌株GFAJ-1，将改写生物教科书，使地球外寻找生命的范围得以拓展。 </P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/03/170111bt1lbegg2sz4obts.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/03/170111bt1lbegg2sz4obts.jpg"></A></P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/03/1700503ukebj3mkmj5mncx.jpg" target=_blank></A></P> <P>美国加利福尼亚莫诺湖研究区，其湖水化学成分非常罕见，湖水含盐量、含碱量以及含砷量都非常高。</P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/03/170129669nk5oak52pky73.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/03/170129669nk5oak52pky73.jpg"></A></P> <P>费利萨·西蒙在处理从莫诺湖中取出的泥块，充当用砷培育微生物的“温床”。 </P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/03/1701366qtgcpkqwnzcvhew.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/03/1701366qtgcpkqwnzcvhew.jpg"></A></P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/03/170129669nk5oak52pky73.jpg" target=_blank></A></P>靠吃磷长大的GFAJ-1菌株。<BR> <BR>NASA当日发布的新闻稿称，碳、氢、氮、氧、磷和硫是地球所有已知生命形式的六大基本构建元素。磷是携带生命基因的DNA和RNA的化学成分之一，被认为是所有活细胞的必需元素。<BR> <BR>砷在化学元素周期表的位置正好位于磷的下方，正是由于两者化学习性相近，所以砷很容易被细胞吸收导致中毒。<BR> <BR>《纽约时报》称，之前，这六种生命元素被视作不可替代的，现在科学家会说，当前的发现将刺激人们去寻找更多替代的可能，就如同科幻片中科学家用硅去替代碳元素那般。<BR> <BR>研究者称尽管极力喂食砷，但在培殖的微生物中还是有一定量的磷元素。<BR> <BR>该发现也将对人类寻找太空生命的任务产生影响，过去类似对于火星的实验性任务，只是以存在的地球生命为特征搜索一些化学元素及反应。</td></tr></table> <!--[diy=diycontentbottom]--><div id="diycontentbottom" class="area"></div><!--[/diy]--> <script src="data/cache/home.js?eOg" type="text/javascript"></script> <div id="click_div"><table cellpadding="0" cellspacing="0" class="atd"> <tr><td> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=click&op=add&clickid=1&idtype=aid&id=1349&hash=b10dace0bf945aeb5ac5c7df4a028bcf&handlekey=clickhandle" id="click_aid_1349_1" onclick="showWindow(this.id, this.href);doane(event);"> <img src="static/image/click/jidan.gif" alt="" /><br />鸡蛋</a> </td> <td> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=click&op=add&clickid=2&idtype=aid&id=1349&hash=b10dace0bf945aeb5ac5c7df4a028bcf&handlekey=clickhandle" id="click_aid_1349_2" 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