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Related Concept Videos

Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is of paramount importance. Osmosis is the movement of water across a semipermeable membrane, such as a cell’s plasma membrane. In living organisms, water plays a crucial role as a solvent—a molecule that dissolves other molecules.
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
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The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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In-vivo Detection of Protein-protein Interactions on Micro-patterned Surfaces
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Probing Electrostatic and Hydrophobic Associative Interactions in Cells.

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This summary is machine-generated.

Researchers developed a new method to map weak biomacromolecular interactions within cells. This technique reveals how electrostatic and hydrophobic forces shape cytoplasmic organization, showing it

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Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Interactions

Background:

  • Cytoplasmic organization is governed by weak, nonspecific interactions between biomacromolecules.
  • Characterizing these interactions within the dense intracellular environment is challenging.

Purpose of the Study:

  • To develop a novel method for indicating and mapping electrostatic and hydrophobic associative interactions in living cells.
  • To investigate the condition- and species-dependent nature of cytoplasmic associative interactions.

Main Methods:

  • Development of a genetically encoded probe comprising a sensing peptide and a circularly permuted green fluorescent protein (cpGFP).
  • Utilizing a ratiometric readout from the cpGFP probe to quantify interactions.
  • Application of the probe in bacterial (Escherichia coli) and mammalian (HEK293T) cells under varying conditions (e.g., ATP depletion).

Main Results:

  • Cytoplasmic components in both bacterial and mammalian cells showed strong interactions with cationic and hydrophobic probes.
  • Neutral hydrophilic probes did not elicit a significant response, indicating inertness.
  • Significant differences observed: Escherichia coli cytoplasm interacted strongly with negatively charged hydrophilic probes, unlike HEK293T cytoplasm.
  • Associative interactions were modulated by ATP depletion, highlighting dynamic cellular states.

Conclusions:

  • The developed probe effectively maps electrostatic and hydrophobic interactions within the cytoplasm.
  • Nonspecific associative interaction profiles are highly dependent on cellular conditions and species.
  • This method provides new insights into the principles of cytoplasmic organization and biomolecular interactions.