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Related Concept Videos

Buffers02:56

Buffers

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A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
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Optimizing Chromatographic Separations01:15

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Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...
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Capillary Electrophoresis: Applications01:30

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Buffer Effectiveness02:19

Buffer Effectiveness

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Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Updated: May 28, 2025

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Concentration buffering and noise reduction in non-equilibrium phase-separating systems.

Christoph Zechner1, Frank Jülicher2

  • 1Center for Systems Biology Dresden, Dresden, Germany; Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany; Cluster of Excellence Physics of Life, TU Dresden, Dresden, Germany; Faculty of Computer Science, TU Dresden, Dresden, Germany.

Cell Systems
|February 8, 2025
PubMed
Summary

Biomolecular condensates may not buffer concentrations or require fixed saturation concentrations for noise reduction. Our analysis shows these concepts are distinct and not always necessary for effective cellular noise control.

Keywords:
concentration bufferingnoise reductionnon-equilibriumphase separation

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Area of Science:

  • Cell Biology
  • Biophysics
  • Systems Biology

Background:

  • Biomolecular condensates are hypothesized to buffer intracellular concentrations and reduce cellular noise.
  • However, multicomponent systems may not require concentration buffering, leading to variable saturation concentrations (csat).

Purpose of the Study:

  • To theoretically analyze the relationship between concentration buffering, saturation concentration, and noise reduction in mesoscopic fluctuating systems.
  • To clarify whether concentration buffering and a constant csat are necessary for effective noise reduction.

Main Methods:

  • Theoretical analysis of mesoscopic fluctuating systems.
  • Examination of equilibrium considerations in multicomponent systems.

Main Results:

  • Concentration buffering and noise reduction are distinct phenomena and not interchangeable.
  • Constant saturation concentration (csat) is neither necessary nor sufficient for effective noise reduction.
  • The proposed link between buffering and noise reduction does not hold for mesoscopic systems.

Conclusions:

  • Established concepts of concentration buffering and noise reduction require re-evaluation in the context of mesoscopic fluctuating systems.
  • Clarity on these distinct concepts is crucial for understanding the role of biomolecular condensates in cellular noise regulation.
  • The findings impact the interpretation of concentration-dependent relationships within cellular environments.