• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Instruments, methods, and missions for astrobiology XVII >Possible effects of diagenesis on the stable isotope composition of amino acids in carbonaceous meteorites
【24h】

Possible effects of diagenesis on the stable isotope composition of amino acids in carbonaceous meteorites

机译：成岩作用对碳质陨石中氨基酸稳定同位素组成的影响

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The initial report of indigenous, non-racemic protein amino acids (L-enantiomer excess) in the Murchison meteorite was based on the fact that only eight of the twenty amino acids characteristic of all life on Earth was present in this stone. The absence of the other protein amino acids indicated that contamination subsequent to impact was highly unlikely. The development of new techniques for determining the stable isotope composition of individual amino acid enantiomers in the Murchison meteorite further documented the extraterrestrial origins of these compounds. The stable isotope approach continues to be used to document the occurrence of an extraterrestrial L-enantiomer excess of protein amino acids in other carbonaceous meteorites. It has been suggested that this L-enantiomer excess may result from aqueous reprocessing on meteorite parent bodies. Preliminary results of simulation experiments are presented that are used to determine the extent to which the stable isotope compositions of amino acid constituents of carbonaceous meteorites may have been altered by these types of diagenetic processes subsequent to synthesis.
机译：默奇森陨石中原生的非外消旋蛋白质氨基酸（L-对映异构体过量）的最初报道是基于这样的事实，即这块石头中仅存在地球上所有生命的二十个氨基酸特征中的八个。其他蛋白质氨基酸的缺乏表明，撞击后的污染极不可能发生。确定Murchison陨石中单个氨基酸对映体稳定同位素组成的新技术的开发进一步证明了这些化合物的地外起源。稳定的同位素方法继续用于记录在其他碳质陨石中存在过量的蛋白质氨基酸的地外L-对映异构体。已经提出，这种L-对映体过量可能是由于在陨石母体上进行水性后处理而引起的。提出了模拟实验的初步结果，这些结果用于确定合成后这些成岩过程可能改变碳质陨石氨基酸成分的稳定同位素组成的程度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号