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関連する概念動画

Chirality in Nature02:30

Chirality in Nature

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. The...
Chirality02:25

Chirality

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...
Prochirality02:05

Prochirality

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...
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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...
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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,...

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Updated: May 23, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

人工スピン氷の新興キラリティ

W R Branford1, S Ladak, D E Read

  • 1Blackett Laboratory, Imperial College, London, UK. w.branford@imperial.ac.uk

Science (New York, N.Y.)
|March 31, 2012
PubMed
まとめ
この要約は機械生成です。

人工のスピン氷は,エキゾチックな磁気相とキラルループ形成を示す. マグネットトランスポート測定は,これらのエッジ誘発トポロジカル状態に関連した異常なホール信号を明らかにします.

さらに関連する動画

A Micropatterning Assay for Measuring Cell Chirality
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A Micropatterning Assay for Measuring Cell Chirality

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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
08:51

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

Published on: August 18, 2017

関連する実験動画

Last Updated: May 23, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

A Micropatterning Assay for Measuring Cell Chirality
08:07

A Micropatterning Assay for Measuring Cell Chirality

Published on: March 11, 2022

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
08:51

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

Published on: August 18, 2017

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マグネチズム (磁気) とは
  • ナノテクノロジー ナノテクノロジー

背景:

  • 人工スピンアイス (ASI) システムは,幾何学的な挫折により複雑な磁気行動を示します.
  • ASIでは,磁気モノポールやキラル・スピン・テクスチャを含むエキゾチックな相が予測されています.

研究 の 目的:

  • 接続されたハネコブASI構造物の磁気伝送特性を調査する.
  • ASIにおけるキラルループ形成と異常なホール効果の関係を探求する.

主な方法:

  • ミツバチの巣の格子に平面ナノ構造の磁鉄棒配列の製造.
  • 異常なホール効果 (AHE) 測定を含む磁気輸送測定.

主要な成果:

  • 接続されたハネコブASIで50ケルビンで異常なホール信号が観測されました.
  • 発生温度は,長距離二極氷相と相関しています.
  • サンプルエッジで形成されるキラルループは,トポロジカルホール信号の源として特定されました.

結論:

  • ナノアレイのエッジ構造は,人工のスピン氷でエキゾチックなトポロジカル状態を設計するための経路を提供します.
  • ASIシステムは,キラル・オーダーやトポロジカル・トランスポートなどの新興現象を研究するためのプラットフォームを提供します.