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activation energy |
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activation energy Etymology: L, activus, active the energy required to convert reactants to transition-state species or an activated complex that will spontaneously proceed to products. activation the process of activating. activation analysis a method of analyzing the content of elements in samples of biological material. The sample is bombarded with nuclear particles and the elements in it measured by the radiation emitted by their radioactive daughter products. Called also radioactivation analysis. activation energy the difference in energy between the ground state of the reactants in a reaction and the point of maximum energy or transition state of the reactions. Usually lowered by enzyme catalysts. activation factor see hageman factor. activation unit the combination of complement (C4, C2 and C3) that binds to the antigen-antibody complex in the initial reaction step in the classical pathway of complement activation. See also complement. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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However, he says, the researchers' calculations consider only 32 water molecules around each ion and don't include an energy barrier that water molecules must overcome as they change their structure and permit passage of the ions. It is noticeable that the energy barrier for BEPDM vulcanization is much smaller than that for EPDM. The undercooling of the iron, however, presents an energy barrier to this structural organization. |
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