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関連する概念動画

Chirality02:25

Chirality

29.3K
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...
29.3K
Chirality in Nature02:30

Chirality in Nature

17.0K
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.
17.0K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

14.9K
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...
14.9K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

6.9K
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...
6.9K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.6K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.6K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.5K

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関連する実験動画

Updated: Jan 27, 2026

A Micropatterning Assay for Measuring Cell Chirality
08:07

A Micropatterning Assay for Measuring Cell Chirality

Published on: March 11, 2022

2.7K

キラル結合ナノマグネット

Zhaochu Luo1,2, Trong Phuong Dao3,2,4, Aleš Hrabec3,2,4

  • 1Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland. zhaochu.luo@psi.ch laura.heyderman@psi.ch pietro.gambardella@mat.ethz.ch.

Science (New York, N.Y.)
|March 30, 2019
PubMed
まとめ
この要約は機械生成です。

研究者は,インターフェイスのDzyaloshinskii-Moriya相互作用を使用して,横に隣接するナノマグネット間の強い結合を達成しました. 完全に電気制御の磁気論理ゲートとメモリデバイスの 新しい設計を可能にします

さらに関連する動画

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine
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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

Published on: February 16, 2018

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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
09:17

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Published on: March 5, 2019

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関連する実験動画

Last Updated: Jan 27, 2026

A Micropatterning Assay for Measuring Cell Chirality
08:07

A Micropatterning Assay for Measuring Cell Chirality

Published on: March 11, 2022

2.7K
Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine
09:14

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

Published on: February 16, 2018

12.6K
Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
09:17

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Published on: March 5, 2019

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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • ナノテクノロジー

背景:

  • 磁気結合のナノマグネットは 揮発性のないメモリや 論理ゲートや センサーに不可欠です
  • 垂直堆積は,磁気結合を達成するための最も効果的な方法でした.
  • ナノマグネットの横断結合は,新しいデバイスアーキテクチャに課題と機会を提示します.

研究 の 目的:

  • 横に隣接するナノマグネットの強い磁気結合を実現する.
  • ナノマグネットの結合のためのインターフェイスDzyaloshinskii-Moriyaの相互作用の使用を探求する.
  • 横のナノマグネットカップリングに基づいた新しい機能とデバイスのアプリケーションを実証します.

主な方法:

  • 横のナノマグネット間の結合を媒介するために,インターフェイスのDzyaloshinskii-Moriya相互作用を使用した.
  • 外平面と内平面の磁気領域間のキラルドメイン壁によって媒介される結合を調査した.
  • ナノマグネットの振る舞いを研究しました この結合が優位である臨界サイズ以下です

主要な成果:

  • 横に隣接するナノマグネットの強い結合が達成されました.
  • 側面交換バイアスとフィールドフリー電流誘発のスイッチングが実証されています.
  • マルチステート磁気構成,合成反鉄磁石,スキルミオン,人工スピンアイスを実現した.
  • 磁気システムにおける幅広い長さスケールとトポロジをカバーした.

結論:

  • インターフェイスのDzyaloshinskii-Moriya相互作用は,横のナノマグネット結合のための強力なメカニズムを提供します.
  • この結合は相関ナノマグネット配列の設計を可能にします.
  • 平面論理ゲートとメモリデバイスの全電気制御のためのプラットフォームを提供します.