scholarly journals Assesment of the Proton Donor Capacity as a Marker of Anti-Oxidative Defense in Premature New Borns

2011 ◽  
Vol 70 ◽  
pp. 678-678
Author(s):  
M Matyas ◽  
G Zaharie ◽  
M Popa ◽  
L Blaga ◽  
S Andreica ◽  
...  
Keyword(s):  
Proton Donor ◽  
Oxidative Defense ◽  
Donor Capacity

Proton-donor and electron-donor capacity of elements of group VI in the hydrogen bond

1978 ◽  
Vol 14 (5) ◽  
pp. 542-546
Author(s):  
V. K. Pogorelyi
Keyword(s):  
Hydrogen Bond ◽  
Electron Donor ◽  
Proton Donor ◽  
Group Vi ◽  
Donor Capacity

ChemInform Abstract: STUDY OF THE PROTON-DONOR CAPACITY OF 4-SUBSTITUTED 1,5-DIPHENYLPENTADIENOLS BY THE IR SPECTROSCOPIC METHOD

1976 ◽  
Vol 7 (13) ◽  
pp. no-no
Author(s):  
N. S. PIVNENKO ◽  
O. V. LAVRUSHINA ◽  
L. M. GRIN ◽  
V. F. LAVRUSHIN
Keyword(s):  
Spectroscopic Method ◽  
Proton Donor ◽  
Donor Capacity ◽  
Ir Spectroscopic

Infrared spectroscopic study of proton-donor capacity of ch bonds of C- and B-ethynylcarboranes

1982 ◽  
Vol 31 (7) ◽  
pp. 1481-1482
Author(s):  
L. E. Vinogradova ◽  
L. A. Leites ◽  
A. I. Kovredov ◽  
V. A. Ol'shevskaya ◽  
L. I. Zakharkin
Keyword(s):  
Spectroscopic Study ◽  
Proton Donor ◽  
Infrared Spectroscopic Study ◽  
Donor Capacity ◽  
Infrared Spectroscopic

Relationships between the proton donor capacity in hydrogen bonds and the CH acidity

1984 ◽  
Vol 20 (1) ◽  
pp. 29-33 ◽  
Author(s):  
T. B. Vishnyakova ◽  
V. K. Pogorelyi
Keyword(s):  
Hydrogen Bonds ◽  
Proton Donor ◽  
Donor Capacity

Investigation of the proton donor capacity of aliphatic N-nitroamines by the method of IR spectroscopy. Thermodynamic parameters of complexes with a hydrogen bond

1982 ◽  
Vol 36 (4) ◽  
pp. 457-463 ◽  
Author(s):  
Yu. V. Ulashkevich ◽  
A. G. Bazanov ◽  
G. S. Denisov ◽  
I. V. Tselinskii
Keyword(s):  
Hydrogen Bond ◽  
Ir Spectroscopy ◽  
Thermodynamic Parameters ◽  
Proton Donor ◽  
Donor Capacity

Mechanistic Study and Development of Catalytic Reactions of Sm(II)

2018 ◽  
Author(s):  
Sandepan Maity ◽  
Robert Flowers
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Proton Donor ◽  
Catalytic Reactions ◽  
Mechanistic Study ◽  
Mechanistic Studies ◽  
Cyclization Reactions ◽  
Mechanistic Approach ◽  
Donor Source

Despite the broad utility and application of SmI<sub>2</sub>in synthesis, the reagent is used in stoichiometric amounts and has a high molecular weight, resulting in a large amount of material being used for reactions requiring one or more equivalents of electrons. We report mechanistic studies on catalytic reactions of Sm(II) employing a terminal magnesium reductant and trimethyl silyl chloride in concert with a non-coordinating proton donor source. Reactions using this approach permitted reductions with as little as 1 mol% Sm. The mechanistic approach enabled catalysis employing HMPA as a ligand, facilitating the development of catalytic Sm(II) 5-<i>exo</i>-<i>trig </i>ketyl olefin cyclization reactions.

Response of maize to field drought stress: oxidative defense system, osmolytes’ accumulation and photosynthetic pigments

2019 ◽  
Vol 51 (3) ◽  
Author(s):  
Sajjad Moharramnejad ◽  
Omid Sofalian ◽  
Mostafa Valizadeh ◽  
Ali Asghari ◽  
Mohammad Reza Shiri ◽  
...  
Keyword(s):  
Drought Stress ◽  
Photosynthetic Pigments ◽  
Defense System ◽  
Oxidative Defense ◽  
Osmolytes Accumulation ◽  
Stress Oxidative

Association of radical anion with alkali cations. IV. ESR study of the 4-nitrobenzophenone radical anion

1980 ◽  
Vol 45 (2) ◽  
pp. 369-375 ◽  
Author(s):  
Stanislav Miertuš ◽  
Ondrej Kyseľ
Keyword(s):  
Hyperfine Splitting ◽  
Radical Anion ◽  
Esr Spectroscopy ◽  
Supporting Electrolyte ◽  
Esr Spectra ◽  
Proton Donor ◽  
Alkali Cations

The 4-nitrobenzophenone radical anion prepared by electrolysis was studied by ESR spectroscopy. On the basis of the interpretation of ESR spectra, the conformation of this system was estimated. The effect of the concentration of supporting electrolyte and of the presence of a proton-donor agent (C2H5OH) was examined. It is assumed that changes in hyperfine splitting constants are caused by association.

scholarly journals Cryo-EM structure and dynamics of the green-light absorbing proteorhodopsin

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Stephan Hirschi ◽  
David Kalbermatter ◽  
Zöhre Ucurum ◽  
Thomas Lemmin ◽  
Dimitrios Fotiadis
Keyword(s):  
Proton Translocation ◽  
Functional Characterization ◽  
Green Light ◽  
Proton Donor ◽  
Molecular Organization ◽  
Primary Proton ◽  
Proton Pumps ◽  
Model Protein ◽  
Dynamics Simulations ◽  
And Function

AbstractThe green-light absorbing proteorhodopsin (GPR) is the archetype of bacterial light-driven proton pumps. Here, we present the 2.9 Å cryo-EM structure of pentameric GPR, resolving important residues of the proton translocation pathway and the oligomerization interface. Superposition with the structure of a close GPR homolog and molecular dynamics simulations reveal conformational variations, which regulate the solvent access to the intra- and extracellular half channels harbouring the primary proton donor E109 and the proposed proton release group E143. We provide a mechanism for the structural rearrangements allowing hydration of the intracellular half channel, which are triggered by changing the protonation state of E109. Functional characterization of selected mutants demonstrates the importance of the molecular organization around E109 and E143 for GPR activity. Furthermore, we present evidence that helices involved in the stabilization of the protomer interfaces serve as scaffolds for facilitating the motion of the other helices. Combined with the more constrained dynamics of the pentamer compared to the monomer, these observations illustrate the previously demonstrated functional significance of GPR oligomerization. Overall, this work provides molecular insights into the structure, dynamics and function of the proteorhodopsin family that will benefit the large scientific community employing GPR as a model protein.

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