Solute Exclusion
Solute Exclusion - Related Videos
05:18
Mutual Exclusivity: How Children Learn the Meanings of Words
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2023
Source: Laboratories of Nicholaus Noles and Judith Danovitch—University of Louisville Humans are different from other animals in many ways, but perhaps the most important differentiating factor is their ability to use language. Other animals can communicate and even understand and use language in limited ways, but trying to teach human language to a chimp or a dog takes a great deal of time and effort. In contrast, young humans acquire their native language easily, and they learn linguistic...
03:06
The Pauli Exclusion Principle
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2020
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information: The number of the principal quantum shell, n, The letter that designates the orbital type (the subshell, l), and A superscript number that designates the number of electrons in that particular subshell. For example, the notation 2p4 indicates four electrons in a p subshell (l = 1) with a principal...
01:25
Exclusions in GDP Calculation II
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2025
GDP helps track the value of goods and services sold in the market, but it leaves out many daily things. Some activities, even though useful or meaningful, are not counted because they don’t involve money or are not part of current production.Imagine someone buys wood, nails, and paint to build chairs they plan to sell. These supplies are seen as part of making the final product. Only the money earned from selling the finished chairs is counted in GDP. The materials are not added separately...
01:29
Choosing Between Projects: Mutually Exclusive
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2024
In capital budgeting, selecting between mutually exclusive projects means choosing one option from a set of options, as both cannot be pursued simultaneously. This decision significantly impacts the company's future growth and financial health. For example, an automobile company deciding between Project A, which generates $20,000 annually for seven years, and Project B, which generates $30,000 annually for five years, may use the Net Present Value (NPV) method. After discounting future cash...
03:24
Isolation of Bacterial Extracellular Vesicles Using Size-Exclusion Chromatography
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2025
Source: Watson, D. C., et al. Scalable Isolation and Purification of Extracellular Vesicles from Escherichia coli and Other Bacteria. J. Vis. Exp. (2021)This video demonstrates the use of size exclusion chromatography with porous resin beads to isolate bacterial extracellular vesicles (EVs) from a bacterial culture filtrate. Larger EVs elute early by bypassing the resin pores, while smaller proteins enter the pores and elute later.
FAQs
Exclusion can result from three distinct conditions: a region may be physically inaccessible, chemically unfavorable, or already occupied by other substances. The outcome therefore reflects both available space and compatibility between the solute and its surroundings. In biology, this framework helps explain why the same solvent region can affect different dissolved molecules unequally.
A solute's size and shape affect how much accessible space it can occupy, while charge and other interactions influence whether the surrounding material is chemically favorable. Because these properties act together, exclusion can alter a molecule's diffusion and local concentration rather than simply stopping movement. The resulting redistribution can also change osmotic pressure in biological systems.
Macromolecules, membranes, and other structures reduce the solvent volume available to dissolved substances. This excluded-volume effect creates molecular crowding, meaning solutes share less freely accessible space than their total surroundings might suggest. Consequently, diffusion, concentration, and osmotic pressure can differ from values expected in a more open solvent. The principle provides a physical basis for interpreting crowded biological environments.
In this method, a sample passes through porous beads. Larger molecules cannot enter the beads' internal volume, so they travel around the particles and reach the outlet earlier. Smaller molecules enter more of that internal space and therefore take longer to elute. Separation thus reflects each molecule's differential access to the bead pores and the resulting travel path.
An earlier elution indicates that a molecule accessed less of the porous beads' internal volume than molecules eluting later. In the stated mechanism, this pattern is associated with larger molecules passing around the beads, whereas smaller molecules spend more time within accessible internal space. Elution order therefore provides information about relative molecular size.
Membranes, gels, porous materials, and macromolecular assemblies can all create regions with limited solute access. In biology, examining these structures helps connect physical organization with changes in diffusion, concentration, and osmotic pressure. The same principle therefore applies across cellular crowding and separation materials, linking biological organization to analytical methods such as size-exclusion chromatography.