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.
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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.
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.
v-Ha-ras transgene abrogates the initiation step in mouse skin tumorigenesis: effects of phorbol esters and retinoic acid.
The number of monomer/oligomer molecules forming a polymer in initiation step is negligible in the beginning.
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.
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.
Solution pH influences the process primarily through the initiation step.
The above results indicate that the sharper the notch the less effect the thermal history has on the fracture energy, or in other words, the crack initiation step is more sensitive to the thermal treatment used in the foaming procedure than the crack propagation step.
Abraham Awolich, a coordinator at the steering committee secretariat said the initiation steps would take more than a month.
As previously announced, critical study initiation steps, monitoring and reporting will be managed by Cato Research Ltd.

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