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The Evidence for Evolution02:55

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
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A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...

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XANES证据反对一个在氧进化复合体S3状态下的曼甘物种.

Tsu-Chien Weng1, Wen-Yuan Hsieh, Erich S Uffelman

  • 1Department of Chemistry and the Biophysics Research Division, The University of Michigan, Ann Arbor, MI 48109-1055, USA.

Journal of the American Chemical Society
|July 1, 2004
PubMed
概括

这项研究报告了尼尔Mn=O复合体的第一个X射线吸收光谱. 这些发现表明,边缘过渡对于检测曼甘物种是敏感的,但不是EXAFS或边缘能量测量.

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科学领域:

  • 无机化学 无机化学
  • 生物化学 生物化学
  • 频谱学是一种光谱学.

背景情况:

  • 基-氧 (Mn=O) 种被认为是光合作用和催化过程中的中间体.
  • 使用光谱学将Mn=O物种与低价值复合物区分开来是具有挑战性的.

研究的目的:

  • 报告第一个manganyl Mn=O 复合体的X射线吸收光谱.
  • 评估X射线吸收光谱 (XAS) 技术用于检测Mn=O物种的灵敏度.

主要方法:

  • 获得的X射线吸收光谱,包括扩展X射线吸收细结构 (EXAFS) 和边缘能量测量,用于合成MnV=O复合体 (Na[MnV=O(HMPAB) ].
  • 将光谱数据与低价值复合物进行比较.
  • 分析了前边缘过渡强度作为Mn=O物种的潜在指标.

主要成果:

  • EXAFS和边缘能量测量显示灵敏度不足以可靠地检测Mn=O物种.
  • 在MnV=O复合体中,前边界过渡的强度是非曼烯复合体的四倍.
  • 这种增强的前沿过渡强度是检测曼甘尼尔物种的敏感标记.

结论:

  • 在XAS中预边缘过渡分析是检测尼尔Mn=O物种的敏感方法.
  • 结果提供了强有力的证据,反对在光合作用氧进化复合体 (通过S3状态) 中存在曼甘Mn=O物种.