initiation step

initiation step

[i‚nish·ē′ā·shən ‚step]
(chemistry)
The reaction that causes a chain reaction to begin but is not itself the principal source of products.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The initiation step starts when photoinitiator molecules absorb photons to form photoinitiator free radicals, I*.
The objectives of this project are to (a) develop a radiation intensity model to derive the intensity field characteristics in absorbing, reacting, and scattering reaction media in which the rate of the reaction initiation step is expressed as a function of the local volumetric rate of energy absorption (LVREA); (b) develop a model for inactivation of microbes in a filter fiber media using mathematical and experimental data.
The initiation step involves application of a subcarcinogenic dose of a carcinogen such as 7,12-dimethylbenz[a]anthracene (DMBA), which induces mutations in gene(s) through metabolism to reactive diol-epoxide metabolites and their subsequent covalent binding to DNA forming DNA adducts.
They are believed to be involved in the initiation step of translation at high temperature and possibly a molecular chaperone.
After the initiation step is complete, and individuals begin to react to common, everyday chemicals and substances, these reactions are termed "triggering." Triggering is considered to be the second step in the development of MCS.
The number of monomer/oligomer molecules forming a polymer in initiation step is negligible in the beginning.
Bringing wireless vendors to campus for demonstrations was also part of this initiation step of the process.
Materials which act as peroxide decomposers retarding the formation of free radicals in the initiation step are known as preventive antioxidants.
In breast cancer, the initiation step appears to occur sometime during puberty, during the development of the mammary gland, and does not appear to be related to diet.
In free radical polymerization process, activation energy is used to characterize the kinetics of the initiation step. This parameter could be measured from the gel time.
The initiation step of degradation in oxygen produces the radical precursors.
As this coloration starts from the beginning of the polymerization, it can be related to a change in the chemical structure of DMAP in the initiation step.

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