Singlet oxygen in the environmental sciences. IX. Product distribution from reactions of singlet molecular oxygen in the gas phase

1970 ◽  
Vol 92 (24) ◽  
pp. 7042-7044 ◽  
Author(s):  
James N. Pitts ◽  
W. S. Gleason ◽  
Ionel. Rosenthal
Keyword(s):  
Singlet Oxygen ◽  
Gas Phase ◽  
Molecular Oxygen ◽  
Product Distribution ◽  
Environmental Sciences ◽  
Singlet Molecular Oxygen

Singlet oxygen in the environmental sciences. Singlet molecular oxygen and photochemical air pollution

1969 ◽  
Vol 3 (3) ◽  
pp. 241-247 ◽  
Author(s):  
James N. Pitts ◽  
Ahsan U. Khan ◽  
E. Brian Smith ◽  
Richard P. Wayne
Keyword(s):  
Air Pollution ◽  
Singlet Oxygen ◽  
Molecular Oxygen ◽  
Environmental Sciences ◽  
Singlet Molecular Oxygen

Polydiene Oxidations with Singlet Oxygen

1972 ◽  
Vol 45 (2) ◽  
pp. 423-436 ◽  
Author(s):  
M. L. Kaplan ◽  
P. G. Kelleher
Keyword(s):  
Singlet Oxygen ◽  
Gas Phase ◽  
Molecular Oxygen ◽  
Ground State ◽  
Homogeneous Solution ◽  
Surface Oxidation ◽  
Electrodeless Discharge ◽  
Photosensitized Oxidation

Abstract Excited molecular oxygen in its singlet delta (1Δg) state can be made chemically in homogeneous solution and in the gas-phase by the electrodeless discharge of ground state oxygen. Both techniques have been used to perform oxidations of polydiene systems. Solutions of high cis, trans, and vinyl polybutadienes have been treated with singlet oxygen produced in situ. Only the high cis and high trans were oxidized, apparently by different mechanisms. Squalene, a model for polyisoprene, has been oxidized in solution and the initially formed hydroperoxides reduced and analyzed and found identical to the product from a photosensitized oxidation. Cis-polybutadiene films were treated with gas-phase singlet oxygen and the extent of surface oxidation was monitored spectroscopically and chemically.

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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