Van-der-Waals-interaction

Direct ligand-protein interactions. Van der Waals and Coulomb energy of interaction of atoms of ligand with atoms on protein. 

Stretching, bond bending, torsions, electrostatic interactions, van der Waals forces, and hydrogen bonding. Force fields differ in the number of terms in the energy expression, the complexity of those terms, and the way in which the constants were obtained. Since electrons are not explicitly included, electronic processes cannot be modeled. 

V n der W ls Interactions. Van der Waals iateractions result from the asymmetric distribution of electronic charge surrounding an atom, which induces a complementary dipole in a neighboring atom, resulting in an attractive force. In general, the attractive force of van der Waals interactions is very weak (<4.2 kJ/mol (1 kcal/mol)) but may become significant if steric complementarity creates an opportunity to form a large number of van der Waals attractions. 

Id. The Ideal Rubber.—The data available at present as summarized above show convincingly that for natural rubber (dE/dL)T,v is equal to zero within experimental error up to extensions where crystalhzation sets in (see Sec. le). The experiments of Meyer and van der Wyk on rubber in shear indicate that this coefficient does not exceed a few percent of the stress even at very small deformations. This implies not only that the energy of intermolecular interaction (van der Waals interaction) is affected negligibly by deformation at constant volume—which is hardly surprising inasmuch as the average intermolecular distance must remain unchanged—but also that con-... 

Adsorption can be attributed to the following interactions van der Waals-London interactions, charge transfer/hydrogen bonding, ligand exchanges, ion exchange, direct and induced ion-dipole... 

One of the aims of the crystallographic studies is to visualize the spatial conditions of non-H-bond type of interactions. Van der Waals forces (dispersion and exchange repulsion) and polarization are representatives of such interactive forces. They are governed by geometric features such as contact surfaces and volumes of the host and guest matrices. 

The ASSOCIATION of two molecules uses the same interactions that stabilize a protein s structure hydrophobic interactions, van der Waals interactions, hydrogen bonds, and ionic interactions. To get the most out of the interaction, the two molecules must be complementary. 

Increasing temperature favors the open or unfolded form. The various forces resulting in a folded conformation of the DKP ring include dipole-induced dipole interactions, van der Waals forces, and interaction... 

The recognition is the binding of a carbohydrate by a specific receptor, which is usually part of a protein (enzyme, immunoglobuUn, lectin). The process is due to the sum of weak interactions (van der Waals-London, hydrogen bonds) that may results in high association constants. 

In the absence of a three-electron bond, it is possible that some interaction (Van der Waals, electrostatics, etc.) between the product radical and anion exists. This situation has been discussed in some detail for the interaction between a halide ion and an alkyl radical generated in the gas phase by dissociative electron attachment to an alkyl halide. " It is expected that these interactions will be more important in the gas phase, as a solvent tends to screen charge. Wentworth suggested that an appropriate potential... 

Intexmolecular forces can be repulsive as well as attractive in nature. Tuo molecules ultimately reach a miniimm distance between them as they approach one another, and this distance is the sum of the van der Waals radii of the interacting groape. Hence, the van der Waals radius is considered a measure of the effective size of an atom in noncovalent interactions. Van der Waals radius is correlated with another measure of steric repulsion, Es.)... 

There are three types of nonbonding intermolecular interaction dipole-dipole interactions, van der Waals forces and hydrogen bonding. These interactions increase significantly as the molecular weights increase, and also increase with increasing polarity of the molecules. 

VVdw sums up the interactions (van der Waals) between atoms of a molecule that are not bonded to each other. The set of functions, called the force field, contains adjustable pa-... 

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