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Related Concept Videos

Tension01:10

Tension

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Tension is a force along the length of a medium, in particular, a force carried by a flexible medium, such as a rope or cable. The word "tension" comes from Latin, meaning "to stretch". Not coincidentally, the flexible cords that carry muscle forces to other parts of the body are called tendons. Any flexible connector, such as a string, rope, chain, wire, or cable, can exert pull only parallel to its length; so, a force carried by a flexible connector is a tension with a...
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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Growth Models with Integration: Problem Solving01:27

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In population modeling, integration provides a systematic way to determine accumulated quantities from known rates of change. One such application arises in ecology, where the total weight of a fish population in a body of water is referred to as its biomass. When the rate of growth of this biomass is known as a function of time, calculus can be used to determine the total biomass at a future date.Growth Rate and Biomass FunctionLet the growth rate of the fish population be represented by a...
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Exponential models are essential for describing rapid, multiplicative changes in natural systems, such as population growth. When a population doubles at regular intervals, the process can be modeled using a suitable base. For instance, a bacterial culture that doubles every three hours follows the model n(t)=n0⋅2t/3, where n(t) is the population at the time t.A more general model uses the natural base e, especially for continuous growth. This takes the form n(t)=n0⋅ert, where r is...
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Surface Tension of Fluid01:22

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
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Visualizing Tension and Growth in Model Membranes Using Optical Dyes.

Margrethe A Boyd1, Neha P Kamat2

  • 1Department of Biomedical Engineering, Northwestern University, Evanston, Illinois.

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Summary

Researchers developed a new optical method to measure membrane tension and surface area changes in real-time. This technique reveals that tensed membranes uptake lipids faster and in greater quantities than unstressed membranes.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Membrane Dynamics

Background:

  • Cells dynamically regulate membrane surface area for survival.
  • Model membranes suggest lipid uptake or unfolding accommodates membrane strain.
  • Current methods lack simultaneous real-time measurement of membrane tension and surface area changes.

Purpose of the Study:

  • To introduce a novel method for simultaneously measuring membrane tension and surface area changes in real-time.
  • To investigate lipid uptake dynamics in model membranes under varying tension states.

Main Methods:

  • Utilized lipid vesicles containing two spatially distinct dyes: Laurdan (bilayer) and Förster resonance energy transfer (FRET) dyes (exterior).
  • Employed osmotic stress to induce membrane tension and observed dye responses.
  • Integrated the dye-based assay with microscopy for single vesicle analysis.

Main Results:

  • Developed a new optical method to monitor membrane stretching and lipid uptake in real-time.
  • Demonstrated that membranes under tension exhibit significantly faster and greater lipid uptake compared to non-tensed membranes.
  • Validated the technique's compatibility with microscopy for real-time, single-vesicle membrane dynamics analysis.

Conclusions:

  • The combinatorial use of Laurdan and FRET dyes provides a comprehensive view of changing membrane morphology.
  • This optical method enables remote tracking of membrane tension and surface area changes in model membranes.
  • The technique offers new avenues for studying membrane dynamics in mechanobiology, drug delivery, and artificial/biological membrane research.