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相关概念视频

SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

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This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
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Chirality in Nature02:30

Chirality in Nature

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Prochirality02:05

Prochirality

3.8K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
3.8K
SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

9.7K
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
9.7K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

5.8K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
5.8K
Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

14.3K
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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在dS-DNA中由序列控制的奇拉诱导的旋转选择性效应.

Neeraj Bangruwa1, Suryansh1, Mayra Peralta2,3

  • 1Department of Physics and Astrophysics, University of Delhi, New Delhi 110007, India.

The Journal of chemical physics
|July 24, 2023
PubMed
概括
此摘要是机器生成的。

在双链DNA中,基质诱导的自旋选择性 (CISS) 影响了电子寿命和自旋极化. 这种DNA自旋效应会影响电子转移,并可能使新的DNA传感器成为可能.

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科学领域:

  • 分子生物物理学 分子生物物理学
  • 纳米技术纳米技术
  • 量子化学 是一个量子化学.

背景情况:

  • 嵌合体诱导自旋选择性 (CISS) 是一种现象,在该现象中,嵌合体分子在电荷载体中诱导自旋极化.
  • 双链DNA (ds-DNA) 具有性,这表明CISS效应的可能性.
  • 了解DNA中依赖序列的自旋传输对于分子电子和传感至关重要.

研究的目的:

  • 在双链DNA (ds-DNA) 中研究依赖序列的性诱导旋转选择性 (CISS).
  • 量化CISS对光激发电子寿命和自旋极化的影响.
  • 探索CISS在dS-DNA中的潜力,以开发下一代DNA传感器.

主要方法:

  • 利用与时间相关的单光子计数和电化学阻抗光谱学.
  • 在运输模拟中使用紧密结合计算与格林的函数形式主义相结合.
  • 分析了CISS对电子寿命和dS-DNA系统中自旋极化电子产量的影响.

主要成果:

  • 观察到由于dS-DNA中的CISS而导致的平均电子衰变时间 (345ps) 的显著差异,对于相反的旋转极性.
  • 从完美的ds-DNA到具有点突变的DNA,旋转极化电子产量的减少超过35%.
  • 实验发现得到了理论模拟的支持,使用紧固结合和格林的函数方法.

结论:

  • 通过dS-DNA建立了对特定序列,自旋依赖的电子转移的基本理解.
  • 突出了CISS在调节DNA电子运输特性中的作用.
  • 为开发利用CISS效应的先进的基于旋转的DNA传感器铺平了道路.