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Strain bond deformation

Another hypothesis suggests that the binding of a substrate to an enzyme causes a strain or deformation of some of the bonds in the substrate molecule, which are subsequently broken. The effectiveness of this mechanism depends upon the strength of the binding force and does not necessarily involve any movement of the protein but suggests the idea of a flexible enzyme. [Pg.267]

Using bicyclic annelation, Natia Franck obtained bond deformation in such a way that double bonds prefer to be exocyclic to strained bicyclic rings N. Frank, J. S. Siegel, Angew. Chem. Int. Ed. Engl. 1995, 34, 1454. [Pg.18]

The mechanical hysteresis of poly ether PUs investigated by Gorge et al was studied as a function of temperature, percent strain, and deformation energy. Hysteresis values remained small at low temperatures when the extent of the sample deformation did not disrupt the glassy matrix. This was readily evident at temperatures below the glass transition temperature Tg) of the polymer where the material did not formally yield. At temperatures above the Tg of the polymer, hysteresis remained small even at substantial strains levels and demonstrated the capabilities of the HS domains to act as physical crosslinks. At high emperatures, the percent hysteresis increased as the hydrogen-bonded HS domains weakened. [Pg.118]

The angle and bond deformations are most pronounced for the three- and four-membered cyclic monomers and as a result [M]eq is very small. The five- and six-membered cyclic monomers are the least strained, and some of them are unable to polymerize. The introduction of a carbonyl group into the five-membered cycle makes the resultant compounds incapable of high polymer formation under normal conditions. This is caused by sp hybridization of the carbon atom in the... [Pg.254]

We expect from theoretical considerations that a simple Hookean model cannot properly describe the mechanical behaviour of macromolecules in the region of large strains arising from covalent bond deformation. Furthermore, it can also be expected that correlation effects become increasingly important during such deformations. Fig 1. shows the retractive force acting on a PE chain at different elongations. We can observe that the deviation from... [Pg.104]

The 2 -order term in the power series is given in terms of the energies of elastic chemical bond deformations, modeled as Hooke s law springs, divided by the corresponding volume of the unit cell, UA. Such higher order terms may be important at high degrees of strain associated with plastic deformation. [Pg.99]

The interaction potential (R) describes both bonding and non-bon ding in teraction s. Th e bon dm g interactions arc u snally form u -lated as a strain energy that is zero at some ideal configuration of the atoms and describe how the energy increases as the ideal con-figu ration is deform ed. Don d in g in teraction s ii su ally refer to atom s in the following relationships ... [Pg.174]


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See also in sourсe #XX -- [ Pg.5 ]

See also in sourсe #XX -- [ Pg.9 ]




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Strain deformation

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