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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

Segregation in Fresh Concrete

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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 Expressions01:28

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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

Mechanistic Models: Compartment Models in Individual and Population Analysis

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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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Author Spotlight: Advancing Research in Microbial Autoaggregation Using Imaging Flow Cytometry
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Disaggregation at High Volume Exclusion: An "Overcrowding" Effect.

Leon Koch1, Dominik Baier2, Satyendra Rajput3

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

The Journal of Physical Chemistry. B
|September 30, 2025
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Summary
This summary is machine-generated.

Macromolecular crowding, common in cells, can surprisingly reverse self-assembly effects at high concentrations, a phenomenon termed "overcrowding". This challenges previous assumptions about biomolecular processes under dense conditions.

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Area of Science:

  • Biophysics
  • Biochemistry
  • Cell Biology

Background:

  • Macromolecular crowding significantly influences biological processes in cellular environments like the cytoplasm and blood.
  • Cells exhibit heterogeneous crowding, with dense regions like biomolecular condensates impacting molecular interactions.
  • Volume exclusion is a primary driver of macromolecular crowding effects.

Purpose of the Study:

  • To investigate the impact of varying macromolecular crowding densities on self-assembly processes.
  • To explore the role of crowder concentration and type on the self-assembly of probe molecules and proteins.
  • To identify potential reversals in self-assembly behavior under extreme crowding conditions.

Main Methods:

  • Utilized pseudo isocyanine chloride (PIC) as a model for self-assembling proteins, monitoring its aggregation via UV-vis spectroscopy.
  • Employed Ficoll and silica nanoparticles as distinct macromolecular crowders.
  • Complemented experimental data with molecular dynamics simulations and preliminary fibrinogen self-assembly studies.

Main Results:

  • Both crowders initially promoted PIC self-assembly through depletion interactions, as expected.
  • At high crowder concentrations (overlap/space-filling), a reversal of self-assembly promotion was observed due to topological constraints.
  • Fibrinogen self-assembly in the presence of Ficoll corroborated the findings with PIC, indicating a generalizable phenomenon.

Conclusions:

  • Macromolecular crowding effects on self-assembly can be reversed at very high densities, a phenomenon termed "overcrowding".
  • This reversal challenges the conventional understanding of crowding-induced self-assembly, suggesting complex topological effects dominate.
  • The findings have implications for understanding biomolecular organization and function in crowded cellular environments.