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Related Concept Videos

Osmosis01:30

Osmosis

Osmosis is the movement of free water molecules through a semipermeable membrane.  The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
Water, like other substances, moves from a high concentration of free water...
Osmosis00:47

Osmosis

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.
Osmosis and Osmotic Pressure of Solutions02:40

Osmosis and Osmotic Pressure of Solutions

A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
Osmotic Pressure01:26

Osmotic Pressure

Osmosis is a process where solvent molecules move toward a solution through a semipermeable membrane. As the solution dilutes due to the entry of solvent, it expands. This expansion increases the hydrostatic pressure of the solution. When the hydrostatic pressure equals the osmotic pressure, osmosis stops.Osmotic pressure, denoted by Π, is the minimum pressure needed to prevent the solvent from passing into the solution by osmosis. The van 't Hoff equation calculates the osmotic pressure of an...
One-Compartment Open Model for Extravascular Administration: Zero-Order Absorption Model01:12

One-Compartment Open Model for Extravascular Administration: Zero-Order Absorption Model

Extravascular administration, such as oral or intramuscular routes, is a non-invasive drug delivery method, often preferred for ease and patient compliance. A key factor here is absorption, which dictates how quickly and effectively the drug enters the bloodstream from the administration site. Absorption follows either zero-order or first-order kinetics.
Zero-order absorption maintains a steady rate irrespective of the amount of drug left to be absorbed, making it a constant process. In the...
Factors Influencing Microbial Growth: Osmolarity01:28

Factors Influencing Microbial Growth: Osmolarity

Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...

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In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers
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In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers

Published on: July 28, 2018

Osmosis in a minimal model system.

Thomas W Lion1, Rosalind J Allen

  • 1SUPA, School of Physics and Astronomy, University of Edinburgh, James Clerk Maxwell Building, The King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom. T.Lion-2@sms.ed.ac.uk

The Journal of Chemical Physics
|January 3, 2013
PubMed
Summary
This summary is machine-generated.

This study reveals the microscopic dynamics of osmosis using molecular dynamics simulations. The findings suggest a balance between density-driven forces and diffusion governs osmotic equilibrium in simple systems.

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Area of Science:

  • Physical phenomena
  • Soft matter systems
  • Biophysics

Background:

  • Thermodynamics of osmosis is understood, but microscopic dynamics are debated.
  • Understanding dynamics is key for non-equilibrium systems.

Purpose of the Study:

  • Investigate the microscopic basis of osmosis at equilibrium.
  • Clarify the dynamical mechanisms driving osmotic pressure.

Main Methods:

  • Molecular dynamics simulations of a minimal model.
  • System with repulsive solute and solvent particles differing in external potential interactions.

Main Results:

  • Derived a virial-like relation for osmotic pressure.
  • Simulations support a balance between outward force (increased total density) and inward diffusive flux (decreased solvent density).

Conclusions:

  • A simple balance of forces and diffusion explains osmosis at equilibrium.
  • Complex effects may not be essential for a minimal dynamic model of osmosis.