Cytochrome c enhancement of singlet molecular oxygen production by the NADPH-dependent adrenodoxin reductase-adrenodoxin system: The role of singlet oxygen in damaging adrenal mitochondrial membranes

1973 ◽  
Vol 52 (4) ◽  
pp. 1300-1306 ◽  
Author(s):  
Kiyoshi Goda ◽  
Jau-wen Chu ◽  
Tokuji Kimura ◽  
A.Paul Schaap
Keyword(s):  
Cytochrome C ◽  
Singlet Oxygen ◽  
Molecular Oxygen ◽  
Oxygen Production ◽  
Mitochondrial Membranes ◽  
Singlet Molecular Oxygen ◽  
Adrenodoxin Reductase

The dissociation of iodine by singlet molecular oxygen; role of the vibrational reservoir state A’(2u)

1989 ◽  
Vol 91 (3) ◽  
pp. 1938-1940 ◽  
Author(s):  
M. Nota ◽  
A. J. Bouvier ◽  
R. Bacis ◽  
A. Bouvier ◽  
P. Crozet ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
Singlet Molecular Oxygen ◽  
Reservoir State

Evaluation of EPR monitoring of singlet oxygen production using the photosensitizer chloroboron subphthalocyanine

2011 ◽  
Vol 15 (02) ◽  
pp. 118-121 ◽  
Author(s):  
Lawrence J. Berliner ◽  
Helmut Görner ◽  
Heinz-Peter Schuchmann
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Singlet Oxygen ◽  
Reaction System ◽  
Oxygen Production ◽  
Crucial Aspect ◽  
Singlet Molecular Oxygen ◽  
Radical Product ◽  
Paramagnetic Resonance ◽  
Boron Subphthalocyanine ◽  
Electron Paramagnetic

Singlet molecular oxygen produced in the presence of 2,2,6,6-tetramethyl-4-piperidone (TMPD) in 1,4-dioxan, by boron subphthalocyanine chloride as the sensitizer, was monitored by Electron Paramagnetic Resonance (EPR) via the oxidation of TMPD to the corresponding aminoxyl radical. This radical product is formed in low yields along the singlet oxygen pathway. A kinetic analysis of the process allows one to understand the reasons behind this, while affording more accurate quantitative insights into the mechanistic details. A crucial aspect of this reaction system, which explains the low aminoxyl radical yields along the singlet oxygen pathway, is the disappearance of the sensitizer triplet state in a reaction with TMPD, which has a rate constant of 1 × 109 M-1.s-1.

The Role of Gold Nanoparticles' Aspect Ratio in Plasmon-Enhanced Luminescence and Singlet Oxygen Generation Rate by Mo6 Clusters

2021 ◽  
Author(s):  
Evgeniya D. Novikova ◽  
Yuri A. Vorotnikov ◽  
Nazar A. Nikolaev ◽  
Alphiya R Tsygankova ◽  
Michael A. Shestopalov ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Aspect Ratio ◽  
Singlet Oxygen ◽  
Oxygen Production ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Oxygen Production Rate ◽  
Plasmon Enhanced Luminescence ◽  
Enhanced Luminescence

Here we present a study on the effect of the aspect ratio (AR) of gold nanoparticles on the emission intensity and singlet oxygen production rate of hexamolybdenum cluster-doped silica particles....

Synthesis, crystal structure and physicochemical characterization of a Hg(II) complex with 6-methoxyquinoline as ligand

2015 ◽  
Vol 70 (10) ◽  
pp. 719-725 ◽  
Author(s):  
Cristian Villa-Pérez ◽  
Isabel C. Ortega ◽  
Angélica M. Payán-Aristizábal ◽  
Gustavo Echeverría ◽  
Gloria C. Valencia-Uribe ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
Theoretical Calculations ◽  
Physicochemical Characterization ◽  
Spectroscopic Studies ◽  
Monoclinic Space Group ◽  
Oxygen Production ◽  
X Ray Diffraction ◽  
Singlet Molecular Oxygen ◽  
X Ray

AbstractA new complex of Hg(II) with 6-methoxyquinoline (C10H9NO-6MQ) has been synthesized and characterized. The structure of the complex Hg(6MQ)Cl2 was determined by single crystal X-ray diffraction. It crystallizes in the monoclinic space group P21/c with a = 3.9139(3), b = 26.3400(2), c = 10.9090(9) Å, β = 89.833(6)°, V = 1124.6(1) Å3 and Z = 4 molecules per unit cell. The coordination geometry of the mercury(II) center can be described as a distorted square pyramid formed by one nitrogen atom of the 6MQ and four chlorine atoms. Fourier transform infrared, Raman and UV/Vis spectroscopic studies have been carried out to characterize the compound, using theoretical calculations for the assignment of the experimentally observed bands. The thermal behavior was investigated by thermogravimetric analysis. The quantum yield of singlet molecular oxygen production ΦΔ was measured with steady-state methods in ethanol, using 9,10-dimethylanthracene (DMA) as actinometer and Bengal rose as reference photosensitizer. The resultant singlet molecular oxygen was detected indirectly by photooxidation reactions of DMA. The luminescence properties have also been studied.

Singlet Molecular Oxygen Triggers the soxRS Regulon of Escherichia coli

2001 ◽  
Vol 382 (7) ◽  
pp. 1071-1075 ◽  
Author(s):  
Lucymara F. Agnez-Lima ◽  
Paolo Di Mascio ◽  
Bruce Demple ◽  
Carlos F.M. Menck
Keyword(s):  
Escherichia Coli ◽  
Singlet Oxygen ◽  
Molecular Oxygen ◽  
Singlet Molecular Oxygen ◽  
Signal Molecule ◽  
Present Evidence ◽  
Oxidative Stresses ◽  
Electronically Excited ◽  
Soxrs Regulon ◽  
Intercellular Signal

AbstractThe electronically excited molecular oxygen (singlet oxygen, [1]O[2]) can be detrimental to cells in several ways, although recent reports indicate that it may play a role as an intercellular signal in eukaryotes. Here we present evidence that [1]O[2], generated by thermodissociation of disodium 3,3(1,4-naphthylidene) diproprionate endoperoxide, activates transcription of genes of the soxRS regulon, and that this induction is paralleled by induction of a soxS::lacZ operon fusion. The inductions were dependent on a functional soxR gene. These data imply that protective responses, such as induction of the soxRS regulon, may be triggered by diverse environmental oxidative stresses, and that [1]O[2] may also function as a signal molecule in prokaryotes.

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