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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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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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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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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.
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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.
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Defectos Gemelos Altamente Estables Habilitados por Configuración de Alta Entropía

Yaqing Guo1,2, Jiachi Hong3, Qianwen Dong4

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Los investigadores diseñaron defectos gemelos estables en nanocatalizadores de FeCoNiMn confinados en carbono (T-FeCoNiMn/C). La estabilización impulsada por la entropía mejora el rendimiento catalítico para las reacciones de evolución de oxígeno, ofreciendo nuevas estrategias para el diseño de catalizadores.

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deformación a escala atómicaCatálisisEntropíaTEM in siturotación de defectos gemelos

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Área de la Ciencia:

  • Ciencia de los Materiales
  • Catálisis
  • Nanotecnología

Sus antecedentes:

  • Los defectos cristalinos mejoran la eficiencia de los catalizadores metálicos.
  • El control de defectos en catalizadores de aleaciones multielementales a nanoescala es un desafío debido a las interacciones complejas y la metaestabilidad de los defectos.

Objetivo del estudio:

  • Informar sobre defectos gemelos concentrados y estables en nanocatalizadores de FeCoNiMn confinados en carbono (T-FeCoNiMn/C).
  • Investigar los mecanismos de formación sensibles a la entropía y el rendimiento catalítico duradero de estos defectos.
  • Ofrecer nuevas estrategias para la ingeniería estructural catalítica.

Principales métodos:

  • Integración de aprendizaje profundo, microscopía electrónica de transmisión in situ (TEM) y simulaciones de dinámica molecular.
  • Análisis de la distribución de deformación a escala atómica y la dinámica de formación en varios pasos de los defectos gemelos.
  • Caracterización del rendimiento catalítico para las reacciones de evolución de oxígeno.

Principales resultados:

  • Se formaron y estabilizaron con éxito defectos gemelos concentrados y estables en T-FeCoNiMn/C.
  • La composición multielemental mejorada por entropía proporciona configuraciones atómicas flexibles y un amplio panorama energético, lo que favorece la estabilidad de los defectos gemelos.
  • Los defectos gemelos estables persistieron durante la síntesis y las aplicaciones catalíticas.

Conclusiones:

  • Se demuestra la estabilización de defectos gemelos impulsada por la entropía en nanocatalizadores metálicos.
  • Los hallazgos ofrecen estrategias novedosas para la ingeniería de estructuras de defectos en nanocatalizadores para mejorar el rendimiento.
  • T-FeCoNiMn/C exhibe una actividad catalítica duradera para las reacciones de evolución de oxígeno debido a defectos gemelos estables.