scholarly journals An updated model of the hot nitrogen atom kinetics and thermospheric nitric oxide

1997 ◽  
Vol 102 (A1) ◽  
pp. 285-294 ◽  
Author(s):  
J.-C. Gérard ◽  
D. V. Bisikalo ◽  
V. I. Shematovich ◽  
J. W. Duff
Keyword(s):  
Nitric Oxide ◽  
Nitrogen Atom

THE REACTION OF NITROGEN ATOMS WITH OXYGEN ATOMS IN THE ABSENCE OF OXYGEN MOLECULES

1961 ◽  
Vol 39 (8) ◽  
pp. 1601-1607 ◽  
Author(s):  
C. Mavroyannis ◽  
C. A. Winkler
Keyword(s):  
Nitric Oxide ◽  
Nitrogen Atom ◽  
Rate Constant ◽  
Rate Constants ◽  
Flow System ◽  
Titration Method ◽  
Active Nitrogen ◽  
Reaction Tube ◽  
Fast Flow ◽  
Oxygen Atoms

The reaction has been studied in a fast-flow system by introducing nitric oxide in the gas stream with excess active nitrogen. The nitrogen atom consumption was determined by titrating active nitrogen with nitric oxide at different positions along the reaction tube. The rate constant is found to be k1 = 1.83(± 0.2) × 1015 cc2 mole−2 sec−1 at pressures of 3, 3.5, and 4 mm, and with an unheated reaction tube.The homogeneous and surface decay of nitrogen atoms involved in the above system were studied using the nitric oxide titration method, and the rate constants were found to be k3 = 1.04 ± 0.17 × 1016 cc2 mole−2 sec−1, and k4 = 2.5 ± 0.2 sec−1 (γ = 7.5 ± 0.6 × 10–5), respectively, over the range of pressures from 0.5 to 4 mm with an unheated reaction tube.

Kinetics of the reactions of active nitrogen with oxygen and with nitric oxide

1961 ◽  
Vol 261 (1305) ◽  
pp. 259-273 ◽  
Keyword(s):  
Nitric Oxide ◽  
Nitrogen Atom ◽  
Mean Value ◽  
Molecular Constants ◽  
Active Nitrogen ◽  
Gaseous Products ◽  
A Value ◽  
Rate Of Decay ◽  
Products Of Reaction ◽  
Fast Flow

The rate of decay of nitrogen atoms in a fast-flow system in the presence of oxygen has been studied between 412 and 755°K. Nitrogen atom concentrations were estimated by titration with nitric oxide. The slow primary step can be represented by N + O 2 = NO + O, (1) while the much more rapid secondary reaction (2) removes the nitric oxide formed in reaction (1) N + NO = N 2 + O. (2) Reaction (1) was found to be first order in both nitrogen atom and oxygen molecule concentrations, and k 1 could be represented by the expression k 1 = 8.3 x 10 12 exp (— 7100/ RT ) cm 3 mole -1 s -1 between 412 and 755 °K. Under conditions of large oxygen flow rates and at high temperatures the air afterglow continuum was observed with low but easily measurable intensity in the gaseous products of reaction of oxygen with active nitrogen. Both nitric oxide and oxygen atoms are therefore present, and not all the nitric oxide formed in reaction (1) is consumed in reaction (2). These nitric oxide concentrations were determined by measuring the intensity of the air afterglow with a photomultiplier cell, which was calibrated by observation of the increase in the air afterglow intensity when known quantities of nitric oxide were added between the first mixing point and the photomultiplier. In this way a value of k 2 = 3.0 x 10 13 exp( — 200/ RT ) cm 3 mole -1 s -1 was determined. The mean value of k 2 between 476 and 755 °K was 2.5 x 10 13 cm 3 mole -1 s -1 , and was practically independent of temperature over this range, corresponding to a reaction occurring at about one sixth of the bimolecular collision frequency. It can be shown that both reactions (1) and (2) are expected to proceed through transition complexes having very similar molecular constants and vibration frequencies to those of nitrogen dioxide. However, the ratio of the frequency factors calculated on this basis, A 1 / A 2 = 1.4, was much larger than the experimentally determined value of 0.3, and this discrepancy is outside the limits of experimental error.

K absorption structure of the nitrogen atom in the nitric oxide molecule

1974 ◽  
Vol 61 (4) ◽  
pp. 1426-1429 ◽  
Author(s):  
Y. Morioka ◽  
M. Nakamura ◽  
E. Ishiguro ◽  
M. Sasanuma
Keyword(s):  
Nitric Oxide ◽  
Nitrogen Atom ◽  
Oxide Molecule

Nitric Oxide Abstracts a Nitrogen Atom from an Osmium Nitrido Complex To Give Nitrous Oxide

2000 ◽  
Vol 122 (49) ◽  
pp. 12391-12392 ◽  
Author(s):  
Michael R. McCarthy ◽  
Thomas J. Crevier ◽  
Brian Bennett ◽  
Ahmad Dehestani ◽  
James M. Mayer
Keyword(s):  
Nitric Oxide ◽  
Nitrous Oxide ◽  
Nitrogen Atom

THE REACTION OF ACTIVE NITROGEN WITH MIXTURES OF ETHYLENE AND NITRIC OXIDE

1965 ◽  
Vol 43 (7) ◽  
pp. 1899-1904 ◽  
Author(s):  
E. Fersht ◽  
R. A. Back
Keyword(s):  
Nitric Oxide ◽  
Nitrogen Atom ◽  
Active Nitrogen ◽  
Atom Concentration ◽  
Condensed Discharge ◽  
Excited Molecules ◽  
True Measure ◽  
Concerted Reaction

The reaction of active nitrogen, produced in a condensed discharge at 1 mm pressure, with mixtures of ethylene and nitric oxide has been studied with mixtures ranging in composition from pure ethylene to pure nitric oxide. The sum of HCN + 14N16N produced from mixtures of C2H4 and 15NO remained constant and equal to the HCN produced from pure C2H4 for NO concentrations up to 50 mole %. As more NO was added, this sum rose towards the value of 14N15N produced from pure 15NO. These data appear to lend support to the HCN yield from ethylene as the true measure of nitrogen atom concentration. It is suggested that 15NO also undergoes a concerted reaction with excited 14N14N molecules, probably in the A3 Σu+ state, to produce 14N15N, and that these excited molecules can be quenched by collision with ethylene or methane without consuming nitrogen or forming HCN.

Localization of endothelial nitric oxide synthase in the normal and failing human atrial myocardium

1996 ◽  
Vol 54 ◽  
pp. 786-787
Author(s):  
Chi-Ming Wei ◽  
Margarita Bracamonte ◽  
Shi-Wen Jiang ◽  
Richard C. Daly ◽  
Christopher G.A. McGregor ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Heart Failure ◽  
Nitric Oxide Synthase ◽  
Endothelial Nitric Oxide Synthase ◽  
Cardiac Tissues ◽  
Mammalian Tissues ◽  
End Stage Heart Failure ◽  
End Stage ◽  
Oxide Synthase ◽  
Endothelial Nitric Oxide

Nitric oxide (NO) is a potent endothelium-derived relaxing factor which also may modulate cardiomyocyte inotropism and growth via increasing cGMP. While endothelial nitric oxide synthase (eNOS) isoforms have been detected in non-human mammalian tissues, expression and localization of eNOS in the normal and failing human myocardium are poorly defined. Therefore, the present study was designed to investigate eNOS in human cardiac tissues in the presence and absence of congestive heart failure (CHF).Normal and failing atrial tissue were obtained from six cardiac donors and six end-stage heart failure patients undergoing primary cardiac transplantation. ENOS protein expression and localization was investigated utilizing Western blot analysis and immunohistochemical staining with the polyclonal rabbit antibody to eNOS (Transduction Laboratories, Lexington, Kentucky).

Nitric Oxide Reduces Pressor Responsiveness During Ovine Hypoadrenocorticism

2001 ◽  
Vol 28 (5-6) ◽  
pp. 459-462
Author(s):  
Pini Orbach ◽  
Charles E Wood ◽  
Maureen Keller-Wood
Keyword(s):  
Nitric Oxide

Nitric oxide synthase and cellac disease

2001 ◽  
Vol 120 (5) ◽  
pp. A684-A684
Author(s):  
I DANIELS ◽  
I MURRAY ◽  
W GODDARD ◽  
R LONG
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Oxide Synthase
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