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相关概念视频

The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)01:27

Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)

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α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
Direct addition products are...
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Additional Subnuclear Structures02:10

Additional Subnuclear Structures

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The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
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Protein-protein Interfaces02:04

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Eukaryotic Evolution01:24

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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
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Updated: Jan 24, 2026

Measuring the Time-Evolution of Nanoscale Materials with Stopped-Flow and Small-Angle Neutron Scattering
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通过操作式中子反射计量量化动态和依赖添加剂的接口演变.

Kang Wu1,2, Xiaozhi Zhan3,4, Peilin Ran2

  • 1College of Chemical Engineering and Materials, Shandong University of Aeronautics, Binzhou, Shandong 256600, China.

ACS nano
|January 23, 2026
PubMed
概括
此摘要是机器生成的。

了解固体电解质间相 (SEI) 动态是电池性能的关键. 这项研究使用操作中子反射测量来揭示乙烯碳酸盐和乙烯烯碳酸盐添加剂如何创造不同的SEI结构,改善电池的稳定性和寿命.

关键词:
离子电池是一种离子电池.骑自行车的稳定性 骑自行车的稳定性电解质添加剂的电解质添加剂接口动力学 接口动力学运行中子反射计的操作.固体电解质相间阶段

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科学领域:

  • 电池技术 电池技术
  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学

背景情况:

  • 固体电解质间相 (SEI) 对电池性能至关重要.
  • 用电解质添加剂设计SEI是一个有前途的战略.
  • 在循环过程中,SEI层的动态演变还不太清楚.

研究的目的:

  • 在电池循环过程中量化解决SEI的结构动态.
  • 调查乙烯碳酸盐 (FEC) 和乙烯碳酸盐 (VC) 添加剂对SEI形成的影响.
  • 建立一个可转移的操作中子反射计 (NR) 框架,用于分析添加效应.

主要方法:

  • 使用操作中子反射计 (NR) 来实时监测电池循环期间的SEI结构变化.
  • 使用已知分解机制的模型添加剂 (FEC和VC).
  • 开发了一个强大的NR框架,用于对增材系统的机械洞察.

主要成果:

  • 乙烯碳酸盐 (FEC) 形成了一个薄薄的,有机丰富的SEI (LiF主导),增强机械完整性和循环稳定性.
  • 乙烯碳酸 (VC) 形成一个灵活的,有机主导的SEI,减轻压力诱导的微裂纹.
  • 观察到对比的SEI架构,证明了FEC和VC的不同角色.

结论:

  • 操作NR为SEI进化提供了原子解析的见解,SEI进化受到电解质添加剂的影响.
  • 像FEC和VC这样的特定添加剂导致具有量身定制属性的独特SEI结构.
  • 这些发现为改进高能量密度电池的先进电解质添加剂提供了设计原则.