Molecular Adhesion Force
Molecular Adhesion Force - Related Videos
09:48
Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
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Cited by 5 •
2015
A protocol to couple a large variety of single molecules covalently onto an AFM tip is presented. Procedures and examples to determine the adhesion force and free energy of these molecules on solid supports and bio-interfaces are provided.
08:24
Imaging Molecular Adhesion in Cell Rolling by Adhesion Footprint Assay
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Cited by 1 •
2021
This protocol presents the experimental procedures to perform the adhesion footprint assay to image the adhesion events during fast cell rolling adhesion.
01:14
Adhesion
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2019
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 glass...
04:01
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation
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2020
Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws. According to kinetic molecular theory, particles of an ideal gas do not exhibit...
13:22
Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface
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Cited by 15 •
2011
An adhesion frequency assay for measuring receptor-ligand interaction kinetics when both molecules are anchored on the surfaces of the interacting cells is described. This mechanically-based assay is exemplified using a micropipette-pressurized human red blood cell as adhesion sensor and integrin αLβ2 and intercellular adhesion molecule-1 as interacting receptors and ligands.
FAQs
The measured force can arise from several interaction types acting together, including hydrogen bonding, electrostatic attraction, van der Waals forces, and specific receptor-ligand contacts. Their relative contribution depends on the molecules or surfaces involved. Considering these mechanisms helps explain why some attachments support general physical association, whereas others provide selective biological recognition.
Applied load can alter how long adhesive bonds persist before they separate. As the load increases, bond lifetimes may change and the interaction can eventually fail, producing molecular separation. This load dependence connects mechanical conditions with adhesion strength and helps researchers interpret how attached molecules, cells, or surfaces respond to force.
Receptor-ligand contacts provide specificity within molecular adhesion, allowing particular biological partners to recognize and bind one another. That selectivity is especially relevant to immune recognition and pathogen-host binding, where the identity of the interacting molecules matters. Measuring the force associated with these contacts links molecular recognition to the physical strength of attachment.
Atomic force microscopy and optical tweezers are tools used to quantify adhesion at the molecular and cellular scales. These approaches allow researchers to examine the force associated with attachment and separation rather than relying only on whether binding occurs. The resulting measurements connect molecular interactions with larger-scale behaviors such as cell attachment and tissue organization.
Adhesion-force measurements can be applied to cell-matrix attachment, immune recognition, and pathogen-host binding. In each case, quantifying the interaction provides a mechanical perspective on how biological partners remain associated or separate under applied load. This information helps relate molecular binding events to cell behavior and to mechanisms involved in disease.
Interactions among molecules and cells provide physical support for tissue organization, so changes in adhesion can influence how biological structures remain connected. Measuring these forces helps bridge molecular-scale binding with cell behavior and tissue-level arrangement. In biology, that connection is useful for studying both normal organization and disease mechanisms involving altered attachment.