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Adhesion01:14

Adhesion

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
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Surface Tension, Capillary Action, and Viscosity02:57

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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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Cell Adhesion in Plants01:14

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Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
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Cell adhesion molecules (CAMs) are pivotal to multicellularity and the coordinated functioning of tissues and organ systems. They enable physical interactions between cells and provide mechanical strength to tissues. They also function as receptors for signal transmission across the plasma membrane. The CAMs are broadly classified into four families - integrins, cadherins, selectins, and immunoglobulin-like CAMs (IgCAMs).
CAM Families
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Intracellular Signaling Affects Focal Adhesions

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
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Effect of Macromolecular Architecture on Adhesion.

Vladislav S Petrovskii1,2, Igor I Potemkin1

  • 1Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 27, 2024
PubMed
Summary

Chain branching significantly enhances polymer adhesion to substrates. Adhesion force increases linearly with the degree of branching in star-like polymers, crucial for biomaterials like bioglues.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomaterials

Background:

  • Substrate interactions dictate polymer conformation and adhesion.
  • Macromolecular architecture's effect on adhesion is poorly understood.
  • Synthetic peptides are vital in biomedical applications, including bioglues.

Purpose of the Study:

  • Investigate the impact of chain branching on polymer adhesion.
  • Quantify the adhesion force of star-like polymers.
  • Assess the role of branching degree in desorption force.

Main Methods:

  • Atomistic computer simulations.
  • Force experiments simulating chain desorption from a solid substrate.
  • Comparison of linear chains with four- and eight-armed star polymers.

Main Results:

  • Branching enhances adsorption strength for a fixed macromolecule mass.
  • Desorption force shows a linear dependence on the degree of branching.
  • Star-like polymer architectures exhibit stronger adhesion compared to linear chains.

Conclusions:

  • Macromolecular architecture, specifically branching, is a key factor in adhesion.
  • Increased branching leads to stronger polymer-substrate adhesion.
  • Findings are relevant for designing advanced bioglues and other adhesive materials.