isotopic substitution वाक्य
उदाहरण वाक्य
मोबाइल
- Isotopic substitution can modify the rate of reaction in a variety of ways.
- Isotopic substitution is invaluable when using this approach to the determination of molecular structure.
- Isotopic substitution of D will alter k 1 and k 2 while not affecting k 3.
- The goal of spin labeling is somewhat similar to that of isotopic substitution in NMR spectroscopy.
- He also applied this knowledge to the effects of isotopic substitution on the reactivity of organic molecules.
- Therefore, large amounts of the less common isotopic species must be available, limiting observable solvent isotope effects to isotopic substitutions involving hydrogen.
- Isotopic substitution of one of two deuterium atoms for a hydrogen atom causes the environment of nearby NMR-active atoms to change dramatically.
- In addition, we have not specified the isotopic substitution in the N2 product of the second and third reactions because N2 is symmetric.
- Where _ a is the number of tracer atoms within S, while ^ b is the number of isotopic substitutions in the same molecule.
- Alternatively, it may mean that the isotopic substitution is at the reaction site, but vibrational changes associated with bonds to this atom occur after the rate-determining step.
- Whereas there is no solid experimental support for either model, recent accurate measurements of isotopic shift of the transition temperature Tc upon boron and carbon isotopic substitutions favor the BCS theory.
- In most cases, isotopic substitution at A, especially if it is a heavy atom, will not alter k 1 or k 2, but it will most probably alter k 3.
- Isotopic substitution of B will clearly alter k 3, but it may also alter k 1 to a lesser extent if the B-C bond vibrations are affected in the transition state of the first step.
- The isotopic substitution changes the vibrational frequencies of various bonds in the molecule, which can have observable effects on the chemical reactivity via the kinetic isotope effect, and even by extension the biological activity in some cases.
- In practice, together with isotopic substitution, this means that a continuous comb of frequencies separated by around 1 cm " 1 ( 30 GHz ) can be used that extend from 880 to 1090 cm " 1.
- Since kinetic isotope effects arise from differences in isotopic masses, the largest observable kinetic isotope effects are associated with isotopic substitutions of hydrogen with deuterium ( 100 % increase in mass ) or tritium ( 200 % increase in mass ).
- For this reaction, isotopic substitution happens to produce an inverse kinetic isotope effect, and the authors report a kinetic isotope effect as low as 1.74 x 10 " 4, which is the smallest kinetic isotope effect ever reported.
- Silva, R . A . G . D ., Kubelka, J ., Bour, P ., Decatur, S . M ., and Keiderling, T . A . ( 2000 ) " Site-Specific Conformational Determination in Thermal Unfolding Studies of Helical Peptides Using Vibrational Circular Dichroism with Isotopic Substitution, " " The Proceedings of the National Academy of Sciences"
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