Evaluation of Acyclic Form Content and Molar Absorption Coefficient of Carbonyl Group of Ketohexoses in Aqueous Solution

2012 ◽  
Vol 41 (12) ◽  
pp. 1686-1688 ◽  
Author(s):  
Kazuhiro Fukada ◽  
Masakazu Okamitsu ◽  
Masashi Sato
Keyword(s):  
Aqueous Solution ◽  
Absorption Coefficient ◽  
Carbonyl Group ◽  
Molar Absorption Coefficient

scholarly journals A soluble NADH dehydrogenase (NADH: ferricyanide oxidoreductase) from Thermus aquaticus strain T351

1983 ◽  
Vol 209 (2) ◽  
pp. 427-433 ◽  
Author(s):  
K A J Walsh ◽  
R M Daniel ◽  
H W Morgan
Keyword(s):  
Absorption Coefficient ◽  
Molecular Mass ◽  
Half Life ◽  
Nadh Dehydrogenase ◽  
Molar Absorption Coefficient ◽  
Effect Of Temperature ◽  
Thermus Aquaticus ◽  
Membrane Bound ◽  
The Stability

A soluble NADH dehydrogenase (NADH:ferricyanide oxidoreductase) has been obtained by simple disruption of cells of Thermus aquaticus strain T351, and purified. The enzyme is of low molecular mass, 50 000 Da, and displays many of the properties of the membrane-bound enzyme, including inhibition by both NADH and ferricyanide, and the same Km for ferricyanide. The enzyme contains 0.05 mol of FMN, 0.16 mol of labile sulphur and 2.2 mol of iron per mol of protein. The enzyme is inhibited by NAD and cupferron competitively with ferricyanide, and by ATP (but not ADP) competitively with NADH. The enzyme is particularly thermostable, having a half-life at 95 degrees C of 35 min. The effect of temperature on the molar absorption coefficient and the stability of NADH was determined.

Rate–acidity profiles for exchange of the 4-methyl protons in amino, imino, and keto pyrimidines

1979 ◽  
Vol 57 (20) ◽  
pp. 2783-2789 ◽  
Author(s):  
Ross Stewart ◽  
Stewart J. Gumbley ◽  
R. Srinivasan
Keyword(s):  
Aqueous Solution ◽  
Carbonyl Group ◽  
Principal Components ◽  
Kinetic Isotope Effect ◽  
Activation Parameters ◽  
Methyl Groups ◽  
Imino Group ◽  
Hydroxide Ion ◽  
Kinetic Isotope ◽  
Amino Pyrimidine

The rate of exchange of deuterium for protium in the 4-methyl groups of 2-imino-1,4-dimethyl-1,2-dihydropyrimidine (1), 1,4-dimethyl-2-pyrimidone (2), and 4-methyl-2-amino-pyrimidine (3) has been determined in aqueous solution over an acidity range of some 21 pH(H0) units. The various exchange routes involve attack by base (water, hydroxide ion, buffer anion) on substrate (neutral, singly protonated, doubly protonated) and the identities of the principal components across the acidity spectrum have been established for all three compounds. The Brønsted slope, kinetic isotope effect, and activation parameters for 1 have also been determined. Protonating 1 activates it toward exchange by a factor of 103; addition of a second proton has a further effect of >105. The activating effects of the imino group, the carbonyl group, and the protonated imino group in these compounds are in the ratio 10−1:1:102.

The determination of ammonia in sea water

1967 ◽  
Vol 47 (2) ◽  
pp. 271-280 ◽  
Author(s):  
B. S. Newell
Keyword(s):  
Absorption Coefficient ◽  
Sea Water ◽  
Molar Absorption Coefficient ◽  
English Channel ◽  
Precise Method ◽  
Chloramine T ◽  
Oxidation Of Ammonia

A sensitive, specific and precise method for the determination of ammonia in sea water is presented. The method depends upon the oxidation of ammonia by chloramine-T and subsequent coupling with phenol to produce indophenol blue in an n-hexanol extract. Molar absorption coefficient ca 84,000. Values of ammonia measured in samples from the English Channel are given and the effect of freezing on samples for ammonia analysis is discussed.

High activity of aluminated bifunctional mesoporous silica nanoparticles for cumene hydrocracking and measurement of molar absorption coefficient

2015 ◽  
Vol 39 (10) ◽  
pp. 8006-8016 ◽  
Author(s):  
Mohammad Reza Sazegar ◽  
Sugeng Triwahyono ◽  
Aishah Abdul Jalil ◽  
Rino R. Mukti ◽  
Seyed Mohammad Seyed Mohaghegh ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Absorption Coefficient ◽  
Silica Nanoparticles ◽  
High Activity ◽  
Lewis Acid ◽  
Mesoporous Silica Nanoparticles ◽  
Acid Sites ◽  
Molar Absorption Coefficient ◽  
Lewis Acid Sites ◽  
Brønsted And Lewis Acid

Pt/HAlMSN synthesized with Si/Al ratios = 7–50 showed high activity in cumene hydrocracking due to the Brønsted and Lewis acid sites.

scholarly journals Photophysical Challenges and Antenna Effect Between Click Reaction-based Bodipy Derivatives Manufactured From Knorr Pyrrole

2021 ◽  
Author(s):  
ahmed nuri kursunlu ◽  
Akif Kagan Yilmaz ◽  
Elif Bastug ◽  
Ersin Guler
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Absorption Coefficient ◽  
Organic Solvents ◽  
Click Reaction ◽  
Photophysical Properties ◽  
Molar Absorption Coefficient ◽  
Antenna Effect ◽  
Preliminary Study

Abstract In this paper, a series of click reaction-based Bodipy derivatives have been synthesized as part of a preliminary study. Following the characterization of the four challenger molecules, the photophysical properties (absorption, emission, excitation, molar absorption coefficient, quantum yield, etc.) were examined in various organic solvents. The results showed that the energy transfer from the Bodipy cores to other moieties was calculated between 71% and 93% depending on different π-electron configurations and chromophore groups.

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