Isotope effect

Isotope effect

The effect on kinetics of the substitution of one isotope for another in a bond that must be broken in a rate-limiting step (primary isotope effect); especially prominent in the case of cleavage of a bond to a deuterium atom compared with a hydrogen atom. Smaller effects are seen in the case of a substitution of an isotope for a non-reacting atom (secondary isotope effect); effects are also seen on parameters other than the rate-limiting step.

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Industry/Domain: Biology
Category: Biochemistry; Molecular biology
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The effect on the rate or equilibrium constant of two reactions that differ only in the isotopic composition of one or more of their otherwise chemically identical components is ...

isotope effect

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The effect on kinetics of the substitution of one isotope for another in a bond that must be broken in a rate-limiting step (primary isotope effect); especially prominent in the ...

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The correction to the energy levels of a bound-state system due to the finite mass of the nucleus.

primary isotope effect

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A kinetic isotope effect attributable to isotopic substitution of an atom to which a bond is made or broken in the rate-controlling step or in a pre-equilibrium step of a ...

intramolecular isotope effect

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A kinetic isotope effect observed when a single substrate, in which the isotopic atoms occupy equivalent reactive positions, reacts to produce a non-statistical distribution of ...

inverse isotope effect

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A kinetic isotope effect which k l /k h l /k h > 1. The isotope effect will normally be "normal" when the frequency differences between the isotopic transition states are ...

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