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相关概念视频

Amyloid Fibrils03:03

Amyloid Fibrils

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining,...
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Amyloid Fibrils03:03

Amyloid Fibrils

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Correlations02:20

Correlations

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Correlation means that there is a relationship between two or more variables (such as ice cream consumption and crime), but this relationship does not necessarily imply cause and effect. When two variables are correlated, it simply means that as one variable changes, so does the other. We can measure correlation by calculating a statistic known as a correlation coefficient. A correlation coefficient is a number from -1 to +1 that indicates the strength and direction of the relationship between...
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Correlation and Causation01:27

Correlation and Causation

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Statistical tests can calculate whether there is a relationship, or correlation, between independent and dependent variables. An indirect relationship of the variables signifies a correlation, while a direct relationship shows causation. If it is determined that no connection exists between the variables, then the correlation is a coincidence.
Correlation versus Causation
If the dependent variable increases or decreases when the independent variable increases, there is a positive or negative...
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Inverse Trigonometric Functions01:29

Inverse Trigonometric Functions

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Inverse trigonometric functions are fundamental mathematical tools that reverse the actions of standard trigonometric functions. While trigonometric functions map angles to ratios, inverse trigonometric functions perform the opposite operation by mapping a ratio back to its corresponding angle. These functions are essential in various applications, particularly in determining angles when given specific distances, such as calculating elevation angles in navigation and engineering.For a function...
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Correlation01:09

Correlation

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In statistics, two variables are said to be correlated if the values of one variable are associated with the other variable. Depending on the relationship between two variables, correlation can be of three types– positive correlation, negative correlation, and zero correlation.
Two variables, for example, a and b, are said to be positively correlated if both variables move in the same direction. In other words, a positive correlation exists between two variables, a and b, if:
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相关实验视频

Updated: Jan 31, 2026

Use of Two Dimensional Semi-denaturing Detergent Agarose Gel Electrophoresis to Confirm Size Heterogeneity of Amyloid or Amyloid-like Fibers
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氨基酸硬度与体积之间的反向相关性

Roy Nassar1,2,3, Eric Wong3,4, Jörg Gsponer3,4

  • 1Laufer Center for Physical and Quantitative Biology , Stony Brook University , Stony Brook , New York 11794-5252 , United States.

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概括

随着它们的尺寸的增加,粉状纤维的刚度会降低. 由于残留物和键 (H键) 的优化包装,较窄的粉状纤维更加硬,从而提高了机械稳定性.

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Correlative Light and Electron Microscopy to Study Microglial Interactions with β-Amyloid Plaques
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Simple Polyacrylamide-based Multiwell Stiffness Assay for the Study of Stiffness-dependent Cell Responses
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科学领域:

  • 生物物理
  • 材料科学
  • 结构生物学

背景情况:

  • 粉状纤维是涉及各种疾病的蛋白质聚合物.
  • 粉状纤维的机械性质对于理解它们的功能和病理学至关重要.
  • 之前的研究还没有完全阐明粉样纤维体大小与机械性质之间的关系.

研究的目的:

  • 调查粉状纤维的轴硬度和横截面积之间的相关性.
  • 了解驱动所观察到的刚性-大小关系的基础分子机制.
  • 要确定这种尺寸依赖是否是粉状纤维的一般特征.

主要方法:

  • 在形计算中,用于建模和分析粉状纤维的机械性质.
  • 测量了轴度和横截面积,并与之相关联.
  • 分析了与纤维体尺寸相关的键密度和残留包装.

主要成果:

  • 在状纤维的轴硬度和横截面积之间发现了显著的反向相关性.
  • 粉状纤维具有较大的辐射尺寸被发现是较软的,并具有较低的H键密度.
  • 在分析中证实,残留物和H键包装密度决定了刚度与尺寸的关系.

结论:

  • 粉状纤维的纳米机理取决于大小,较窄的纤维具有更高的刚性.
  • 纤维核中的残留物和H键的优化包装有助于增加窄纤维的机械稳定性.
  • 这种尺寸依赖的机械性质是粉样纤维的总体特征,类似于它们的交叉β片结构.