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Fluid Mosaic Model01:19

Fluid Mosaic Model

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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The Fluid Mosaic Model01:34

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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Freely floating smectic films.

Kathrin May1, Kirsten Harth, Torsten Trittel

  • 1Otto von Guericke University Magdeburg, MARS and Institute of Experimental Physics, Universitätsplatz 2, 39106 Magdeburg (Germany).

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|April 3, 2014
PubMed
Summary
This summary is machine-generated.

Freely floating smectic bubbles, ideal for thin-film fluid dynamics, relax from elongated shapes to spheres. Their unique dynamics combine soap film and vesicle properties, including layer redistribution and damped oscillations.

Keywords:
freely suspended filmsliquid crystalsoscillation dynamicsrupturesmectic films

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Area of Science:

  • Fluid dynamics
  • Soft matter physics
  • Materials science

Background:

  • Smectic bubbles are unique systems combining properties of soap films and vesicles.
  • Their internal smectic layer structure influences their dynamic behavior.
  • Freely floating bubbles offer a controlled environment for studying thin-film dynamics.

Purpose of the Study:

  • To investigate the shape dynamics of freely floating smectic bubbles.
  • To understand the relaxation processes from initial elongated shapes to equilibrium spheres.
  • To characterize bubble rupture and smectic filament formation.

Main Methods:

  • Preparation of smectic bubbles from collapsing catenoids.
  • High-speed optical imaging for dynamic observation.
  • Analysis of bubble size dynamics across a range of scales.

Main Results:

  • Observed relaxation of elongated bubbles towards spherical equilibrium.
  • Identified two distinct relaxation phases: slow layer redistribution and damped shape oscillations.
  • Described the phenomena of bubble rupture and the formation of stable smectic filaments.

Conclusions:

  • Smectic bubbles serve as excellent model systems for thin-film fluid dynamics.
  • The internal smectic structure dictates unique shape dynamics.
  • The study provides insights into bubble rupture and filament stability.