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相关概念视频

Unsoundness of Aggregate due to Volume Change01:26

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Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
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Maximum Size of Aggregate01:12

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The maximum size of aggregate is defined as the aperture of the sieve retaining 15 percent or more of the particles present in the aggregate sample. The aggregate's maximum size impacts the concrete's water requirement, workability, and strength. Larger aggregates reduce the surface area needing cement paste coverage, which can lower water needs, thereby allowing a decrease in the water-to-cement ratio when the desired workability and richness of the mix are to be maintained, which can...
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Segregation in Fresh Concrete01:16

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Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
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Rational expressions are algebraic fractions in which both the numerator and the denominator are polynomials. These expressions follow the arithmetic rules of numerical fractions but require extra care due to the presence of variables. A fundamental part of working with rational expressions is identifying values that make the expression undefined, typically those that result in division by zero or undefined radicals.Determining the DomainThe domain of a rational expression includes all real...
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Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

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Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least...
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Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
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Updated: Jan 16, 2026

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大量排除的分类:一个"过度拥挤"效应.

Leon Koch1, Dominik Baier2, Satyendra Rajput3

  • 1Physical Chemistry, Paderborn University, Paderborn 33098, Germany.

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|September 30, 2025
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概括
此摘要是机器生成的。

细胞中常见的宏分子拥挤,在高度下,可以令人惊地逆转自我组装效应,这种现象被称为"过度拥挤". 这挑战了以前关于在密集条件下的生物分子过程的假设.

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科学领域:

  • 生物物理学的生物物理.
  • 生物化学 生物化学
  • 细胞生物学 细胞生物学

背景情况:

  • 大分子拥挤显著影响细胞环境中的生物过程,如细胞质和血液.
  • 细胞表现出异质的拥挤,密集的区域如生物分子凝聚物影响分子相互作用.
  • 体积排除是宏分子拥挤效应的主要驱动因素.

研究的目的:

  • 研究不同宏分子拥挤密度对自我组装过程的影响.
  • 为了探索crowder度和类型对探头分子和蛋白质自我组装的作用.
  • 在极端拥挤条件下识别自我组装行为的潜在逆转.

主要方法:

  • 利用伪异氨酸化物 (PIC) 作为自我组装蛋白质的模型,通过UV-vis光谱学监测其聚合.
  • 采用Ficoll和纳米颗粒作为不同的宏分子聚合剂.
  • 用分子动力学模拟和初步纤维素原自我组装研究来补充实验数据.

主要成果:

  • 两个人群最初通过消耗相互作用促进了PIC自组装,正如预期的那样.
  • 在高拥挤度 (重叠/空间填充) 时,由于拓约束,观察到自组装促进的反转.
  • 在Ficoll的存在下,纤维素原的自我组装证实了PIC的发现,表明一种可概括的现象.

结论:

  • 大分子拥挤对自我组装的影响可以在非常高的密度下逆转,这种现象被称为"过度拥挤".
  • 这种逆转挑战了对拥挤诱导的自我组装的传统理解,表明复杂的拓效应占主导地位.
  • 这些发现对理解生物分子组织和在拥挤的细胞环境中的功能有意义.