Temat: deuterium isotope effects - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Intrinsic deuterium isotope effects on NMR chemical shifts of hydrogen bonded systems
Autorzy:: Hansen, P.
Powiązania:: https://bibliotekanauki.pl/articles/146965.pdf
Data publikacji:: 2002
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: C-H hydrogen bonds
deuterium isotope effects
intramolecular hydrogen bonds
intrinsic isotope effects
nuclear shielding
steric effects
Opis:: This mini review describes intrinsic deuterium isotope effects on 13C chemical shifts of rigid hydrogen bonded compounds primarily in solution. The steric effects of intramolecularly hydrogen bonded compounds are dissected into different bond interactions leading either to steric compression or to steric twist. One-bond isotope effects involving CH(D) bonds are analyzed in terms of substituent effects and the question is raised whether isotope effects can be useful in the study of CHhydrogen bonds.
Źródło:: Nukleonika; 2002, 47,suppl.1; 37-42
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Deuterium isotope effects in oxidation of dopamine and norepinephrine catalyzed by horseradish peroxidase
Autorzy:: Byszewska, W.
Pająk, M.
Kańska, M.
Powiązania:: https://bibliotekanauki.pl/articles/146852.pdf
Data publikacji:: 2013
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: deuterium
dopamine (DA)
norepinephrine
isotope effects
oxidation
peroxidase
Opis:: Deuterium kinetic isotope effects (KIE’s) in the reaction of oxidation of dopamine (DA) catalyzed by the enzyme horseradish peroxidase (HRP, EC 1.11.1.7) was determined using a non-competitive spectrophotometric method. For kinetic studies, the deuterium ring labelled isotopomer [2’,5’,6’-2H3]-dopamine was synthesized using acid catalyzed isotopic exchange between authentic dopamine and heavy water. Deuterium solvent isotope effects (SIE’s) for dopamine and norepinephrine were determined separately for the enzymatic oxidation carried out in the presence or absence of hydrogen peroxide. Some mechanistic details of enzymatic oxidation of dopamine and norepinephrine to corresponding catecholchromes catalyzed by HRP were discussed.
Źródło:: Nukleonika; 2013, 58, 4; 475-479
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Deuterium isotope effects in oxidation of dopamine by tyramine oxidase
Autorzy:: Pająk, M.
Byszewska, W.
Kańska, M.
Powiązania:: https://bibliotekanauki.pl/articles/147724.pdf
Data publikacji:: 2013
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: deuterium
dopamine (DA)
isotope effects
oxidation
tyramine oxidase
Opis:: We report the studies on the mechanism of oxidation of dopamine (DA) to 3’,4’-dihydroxyphenylacetaldehyde (DOPAL) by enzyme tyramine oxidase (EC 1.4.3.6) using kinetic isotope effects (KIE) and solvent isotope effects (SIE) methods. For kinetic studies, the selectively deuterium labelled isotopologues of dopamine, i.e., [(1R)-2H]-, and [(1S)- -2H]-DA were used. The numerical values of KIE’s for the (1R)- and (1S)-isotopologues of dopamine in the enzymatic oxidation of DA to DOPAL were determined using the non competitive spectrophotometric method. Also, the SIE’s for this reaction carried out in heavy water were obtained spectrophotometrically. Some mechanistic details of enzymatic oxidation of DA to DOPAL were discussed.
Źródło:: Nukleonika; 2013, 58, 2; 255-259
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Isotope effects on selected physicochemical properties of nitromethane and 1-pentanol
Autorzy:: Makowska, A.
Szydłowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/148594.pdf
Data publikacji:: 2006
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: deuterium
isotope effects
density
viscosity
speed of sound
nitromethane
1-pentanol
Opis:: Densities, kinematic viscosities, speed of sound and refractive indices of nitromethane and 1-pentanol and their deuterated derivatives CD3NO2 and C5H11OD were measured. The data obtained allowed to calculate molar volumes, dynamic viscosities, isentropic compressibilities and isobaric thermal expansion. Deuterium isotope effect on the selected physicochemical properties of both nitromethane and 1-pentanol has been determined. Large isotope effects characterizing density, viscosity and speed of sound are observed for nitromethane and much smaller for 1-pentanol. Isotope effects on molar volume are small both for nitromethane and 1-pentanol, but of the opposite sign. These observations are in agreement with the expectations.
Źródło:: Nukleonika; 2006, 51,suppl.2; 81-85
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

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