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Related Concept Videos

Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

Diffusion

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
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Ideal Solutions02:24

Ideal Solutions

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According to Raoult’s law, the partial vapor pressure of a solvent in a solution is equal or identical to the vapor pressure of the pure solvent multiplied by its mole fraction in the solution. However, Raoult's Law is only valid for ideal solutions. For a solution to be ideal, the solvent-solute interaction must be just as strong as a solvent-solvent or solute-solute interaction. This suggests that both the solute and the solvent would use the same amount of energy to escape to the...
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General Properties of Solutions02:12

General Properties of Solutions

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Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. 
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Generation of Size-controlled Poly ethylene Glycol Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices
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Cell-size confinement effect on protein diffusion in crowded poly(ethylene)glycol solution.

Chiho Watanabe1, Miho Yanagisawa

  • 1Department of Applied Physics, Faculty of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan. myanagi@cc.tuat.ac.jp.

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Cell confinement and macromolecular crowding surprisingly accelerate protein diffusion. This effect, observed in cell-mimicking microdroplets, depends on confinement size and crowding level, aiding diffusion in crowded cytoplasm.

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Area of Science:

  • Cellular biology
  • Biophysics
  • Molecular dynamics

Background:

  • Macromolecular crowding and cell confinement are crucial for regulating molecular diffusion within cells.
  • Previous research indicates crowding generally slows diffusion.
  • The combined impact of confinement and crowding on diffusion remains unclear.

Purpose of the Study:

  • To investigate the effect of micrometric confinement on protein diffusion in a crowded cellular environment.
  • To elucidate how cell-like conditions influence molecular mobility.

Main Methods:

  • Utilized fluorescence correlation spectroscopy (FCS) to analyze protein diffusion.
  • Employed microdroplets with polymer solutions enclosed by lipid membranes to simulate cellular conditions.

Main Results:

  • A synergistic effect of crowding and micrometric confinement was found to accelerate protein diffusion on a sub-millisecond timescale.
  • The rate of diffusion acceleration was significantly influenced by the dimensions of the confined space and the extent of crowding.

Conclusions:

  • Cell-size confinement can enhance, rather than hinder, protein diffusion in highly crowded cellular environments.
  • These findings offer new insights into the biophysical regulation of molecular transport in live cells.