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Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
z Scores and Unusual Values01:07

z Scores and Unusual Values

The z score is one of the three measures of relative standing. It describes the location of a value in a dataset relative to the mean. z scores are obtained after the standardization of the values in a dataset. The z score for the mean is 0.
 This score indicates how far a value is from the mean in terms of standard deviation. For example, if a data value has a z score of +1, the researcher can infer that the particular data value is one standard deviation above the mean. If another data value...
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Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
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相关实验视频

Updated: Jul 7, 2026

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues
07:34

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

Published on: June 3, 2013

一个非凡的 [2.2.2] .

Yigang He1, Christopher P Junk, John J Cawley

  • 1Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, USA. david.m.lemal@dartmouth.edu

Journal of the American Chemical Society
|May 8, 2003
PubMed
概括
此摘要是机器生成的。

在 [2.2.2] 螺旋中的替代产生了一个热稳定的化合物. 这种 perfluorinated 推进物表现出对电友的抗性,但很容易被核友和还原剂分裂.

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科学领域:

  • 有机化学 有机化学
  • 化学 的化学
  • 应变化学 应变化学

背景情况:

  • [2.2.2]螺旋骨架是一个高度紧张的分子架构.
  • 了解替代剂对应变系统的影响对于新材料开发至关重要.
  • 之前对非化推进剂的研究提供了对比的基线.

研究的目的:

  • 为了合成和描述一种新型的 perfluorinated [2.2.2]propellane.
  • 为了研究广泛的替代对[2.2.2]芯的稳定性和反应性的影响.
  • 为了比较 perfluorinated propellane 与其非化对应物的化学行为.

主要方法:

  • 为了合成,采用了快速和定量的 [2+2] 循环添加反应.
  • 作为一个前体,使用了压缩基 perfluorobicyclo[2.2.0]hex-1(4) -ene.
  • 反应性研究涉及暴露于电友性试剂,核友和还原剂.

主要成果:

  • perfluorotricyclo[2.2.01,4]octan-2-one乙烯基,一种新的 perfluorinated [2.2.2]propellane,已经成功合成.
  • 合成的螺旋具有显著的热稳定性.
  • 桥头碳-碳键表现出对电友攻击的高抵抗力.
  • 相反,缺乏电子的C-C键易于被核友和温和的降解剂在室温下分裂.

结论:

  • 的替代大大改变了[2.2.2]系统的反应性.
  • perfluorinated 推进剂提供稳定性和选择性反应性的独特组合.
  • 这项研究提供了对高度紧张,化有机化合物的化学有价值的见解.