rate-determining step


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rate-determining step

[′rāt di¦tər·mən·iŋ ‚step]
(chemistry)
In a multistep chemical reaction, the step with the lowest velocity, which determines the rate of the overall reaction.
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The rising figure of the rate constant upon lowering the pH refers to the involvement of protonated species in the rate-determining step.
It is widely held that disruption of chromatin compaction, which can be induced by histone tail modification is a rate-determining step in processes such as RNA transcription, DNA replication and DNA repair.
Covering first basic concepts then reaction mechanisms and kinetic properties, he discusses such topics as reaction mechanisms and elementary steps, experimental laws and calculation of kinetic laws of homogeneous and heterogeneous systems, modes with rate-determining steps, the theory of the activated complex in the gas phase, and the kinetics of heterogeneous stoichiometric reactions.

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