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Chirality in Nature02:30

Chirality in Nature

14.8K
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.
14.8K
Prochirality02:05

Prochirality

4.2K
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...
4.2K
Chirality02:25

Chirality

27.2K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
27.2K
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

19.2K
It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
19.2K
Fischer Projections02:18

Fischer Projections

14.7K
Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines.
14.7K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

6.2K
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...
6.2K

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Updated: Oct 22, 2025

A Micropatterning Assay for Measuring Cell Chirality
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サイラリティ誘発のスピン選択性効果の起源

Seif Alwan1, Yonatan Dubi1,2

  • 1Department of Chemistry, Ben Gurion University of the Negev, Be'er Sheva 8410501, Israel.

Journal of the American Chemical Society
|August 30, 2021
PubMed
まとめ
この要約は機械生成です。

新しい理論は,分子電子学のキラリティ誘発スピン選択性 (CISS) 効果を説明する. 電子回転軌道相互作用と分子ソレノイドフィールドから発生し,実験を現実的なパラメータとマッチングすることを提案しています.

さらに関連する動画

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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関連する実験動画

Last Updated: Oct 22, 2025

A Micropatterning Assay for Measuring Cell Chirality
08:07

A Micropatterning Assay for Measuring Cell Chirality

Published on: March 11, 2022

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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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科学分野:

  • 凝縮物質物理学
  • 分子電子
  • 量子化学について

背景:

  • キラル性誘発スピン選択性 (CISS) 効果は,キラル分子を介して電子輸送によって生成されるスピン極化電流を記述する.
  • 現存する理論は,しばしば不現実的に強いスピン軌道相互作用に 依存している.

研究 の 目的:

  • 現実的なパラメータを用いた実験的観測と一致するCISS効果のための新しい理論的枠組みを開発する.
  • クイラル分子結合におけるスピン偏振の起源を説明するために

主な方法:

  • 電子回転軌道相互作用,分子キラリティ誘発ソレノイドフィールド,およびインターフェース回転移転トルクを含む現象学的理論の開発.
  • 分子結合の簡素化されたモデルで実行された平均場計算.

主要な成果:

  • 提案された理論は,CISS効果の主要な実験的発見を質的に再現します.
  • このモデルは,現実的な物理的パラメータでCISS効果の大きさをうまく説明しています.
  • 電子の特性と分子キラリティの相互作用が決定的であることを示した.

結論:

  • 新しい理論は,CISS効果のより妥当な説明を提供し,焦点を分子内からインターフェイスおよび電極効果に移動させます.
  • この発見は,電極材料と分子インターフェースの注意深い工学が,スピン極化を制御することを示唆しています.
  • この研究は,将来の実験的検証のために,検証可能な予測を提供します.