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Nondisjunction01:29

Nondisjunction

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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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Nondisjunction01:21

Nondisjunction

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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
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Genome Copying Errors02:46

Genome Copying Errors

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DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
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Mismatch Repair01:20

Mismatch Repair

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
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Mismatch Repair01:36

Mismatch Repair

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Overview
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Multimachine Stability01:25

Multimachine Stability

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Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
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Updated: Jan 7, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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高エントロピー構成によって可能になった高安定性ツイン欠陥

Yaqing Guo1,2, Jiachi Hong3, Qianwen Dong4

  • 1College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, China.

Angewandte Chemie (International ed. in English)
|December 26, 2025
PubMed
まとめ

研究者らは、炭素閉じ込めFeCoNiMnナノ触媒（T-FeCoNiMn/C）において安定なツイン欠陥を設計した。エントロピー駆動安定化は、酸素発生反応の触媒性能を向上させ、触媒設計のための新しい戦略を提供する。

キーワード:
原子スケールひずみ触媒作用エントロピーIn situ TEMツイン欠陥回転

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科学分野:

  • 材料科学
  • 触媒作用
  • ナノテクノロジー

背景:

  • 結晶欠陥は金属触媒の効率を高める。
  • ナノサイズのマルチエレメント合金触媒における欠陥制御は、複雑な相互作用と欠陥の不安定性のために困難である。

研究 の 目的:

  • 炭素閉じ込めFeCoNiMnナノ触媒（T-FeCoNiMn/C）における高密度で安定なツイン欠陥を報告すること。
  • これらの欠陥のエントロピー感受性形成メカニズムと耐久性のある触媒性能を調査すること。
  • 触媒構造工学のための新しい戦略を提供すること。

主な方法:

  • 深層学習、in situ透過型電子顕微鏡（TEM）、および分子動力学シミュレーションの統合。
  • 原子スケールひずみ分布とツイン欠陥の多段階形成ダイナミクスの分析。
  • 酸素発生反応の触媒性能のキャラクタリゼーション。

主要な成果:

  • T-FeCoNiMn/Cにおいて、高密度で安定なツイン欠陥が形成され、安定化された。
  • エントロピー強化されたマルチエレメント組成は、柔軟な原子配置と広いエネルギーランドスケープを提供し、ツイン欠陥の安定性を支持する。
  • 安定なツイン欠陥は、合成および触媒応用の全期間を通じて持続した。

結論:

  • 金属ナノ触媒におけるツイン欠陥のエントロピー駆動安定化が実証された。
  • この発見は、性能向上のためのナノ触媒における欠陥構造工学のための新しい戦略を提供する。
  • T-FeCoNiMn/Cは、安定なツイン欠陥により、酸素発生反応に対して耐久性のある触媒活性を示す。