Studies with nitryl hypochlorite: thermal dissociation rate and catalytic conversion to nitric oxide using an NO/O3 chemiluminescence detector

1990 ◽  
Vol 94 (2) ◽  
pp. 644-652 ◽  
Author(s):  
L. C. Anderson ◽  
D. W. Fahey
Keyword(s):  
Nitric Oxide ◽  
Thermal Dissociation ◽  
Catalytic Conversion ◽  
Dissociation Rate ◽  
Chemiluminescence Detector

On-line measurement of nitric oxide generation in buffer-perfused rabbit lungs

1995 ◽  
Vol 78 (4) ◽  
pp. 1502-1508 ◽  
Author(s):  
R. Spriestersbach ◽  
F. Grimminger ◽  
N. Weissmann ◽  
D. Walmrath ◽  
W. Seeger
Keyword(s):  
Nitric Oxide ◽  
Buffer Gas ◽  
Decomposition Products ◽  
Line Measurement ◽  
On Line ◽  
Expired Gas ◽  
Gas Space ◽  
Small Aliquot ◽  
Chemiluminescence Detector ◽  
Inhaled No

In buffer-perfused rabbit lungs, the mixed expired gas was continuously analyzed for nitric oxide (NO) by chemiluminescence detection, and recovery data in dependency of the alveolar O2 tension were established. A small aliquot of the lung effluent was continuously forwarded to a reaction vessel in which the NO decomposition products nitrite, peroxynitrite, and nitrate [summarized as NOx; acidic vanadium (III) chloride reagent] or nitrite (acidic sodium iodide reagent) were quantitatively reduced back to NO, which was then transferred to a second chemiluminescence detector. Under baseline conditions, the perfused lungs continuously released 2.2 +/- 0.21 nmol/min of NO (n = 10) into the gas space. NO was permanently liberated into the intravascular compartment at 7.0 +/- 0.3 nmol/min (n = 4). According to a very low buffer-gas partition coefficient of NO (estimated to be 0.0292 +/- 0.005 in separate equilibration experiments), NO aerated into the prelung perfusate largely escaped into the alveolar space within one lung passage, whereas only low percentages of inhaled NO were detected as NOx in the buffer medium. Immediate increase of lung NO generation in response to A-23187 challenge and inhibition by NG-monomethyl-L-arginine were demonstrated. In conclusion, in buffer-perfused lungs, total NO generation may be monitored by continuous analysis of NO exhalation and perfusate NOx accumulation.

Field Drift Of Plasma-Induced Defects In Phosphorus Doped Si By Reverse Bias Annealing (RBA)

1996 ◽  
Vol 442 ◽  
Author(s):  
J. Takeuchi ◽  
Y. Zaitsu ◽  
T. Shimizu ◽  
S. Matsumoto ◽  
K. Wada
Keyword(s):  
Reverse Bias ◽  
Arrhenius Plot ◽  
Thermal Dissociation ◽  
Dissociation Rate ◽  
Plasma Exposure ◽  
Defect Complexes ◽  
Induced Defects ◽  
Phosphorus Doped ◽  
Charged Defects ◽  
Field Drift

AbstractThe property of plasma induced defects in phosphorus doped CZ silicon has been investigated by reverse bias annealing (RBA). After CF4 plasma exposure, charge density at the surface decreased since plasma induced negatively charged defects inactivated phosphorus. With the increase of annealing time, inactivated phosphorus area moved into the bulk with reverse bias of −3V. Thus it is clearly observed that negatively charged defects drifted from the surface into the bulk. The thermal dissociation energy for phosphorus-defect complexes is estimated to be 1.22eV from the Arrhenius plot of dissociation rate. These defects are likely to be Si self interstitials or vacancies.

A thermal dissociation CAPS for detection of NOy species within the MetNO2 project

2020 ◽  
Author(s):  
Annika Kuß ◽  
Dagmar Kubistin ◽  
Robert Holla ◽  
Christian Plaß-Dülmer ◽  
Erasmus Tensing ◽  
...  
Keyword(s):  
Air Quality ◽  
Thermal Dissociation ◽  
Scientific Data ◽  
Decision Makers ◽  
Alkyl Nitrates ◽  
Calibration Standards ◽  
First Results ◽  
Set Up ◽  
Chemiluminescence Detector

<p>As a toxic and reactive gas, nitrogen dioxide (NO<sub>2</sub>) influences air quality and health, the self-cleaning power of the atmosphere and photochemical smog formation. Reliable scientific data with high quality and comparability are required for national and international decision-makers. The quality of the NO<sub>2</sub> measurements is crucially dependent on the quality of the calibration standards. In order to achieve the quality goals required, the MetNO2 project within the EMPIR (European Metrology Program for Innovation and Research) program aims to provide accurate and stable NO<sub>2</sub> calibration standards for operational use at air quality stations.</p><p>To characterise the impurities of the newly developed standards a Thermal Dissociation - Cavity Attenuated Phase Shift (TD - CAPS) system has been set up, based on the design from Sadanaga et al. (2016). The device includes four heated channels for the differentiation of NO<sub>2</sub>, peroxy and alkyl nitrates and HNO<sub>3</sub>. In parallel, a gold converter coupled with a chemiluminescence detector was deployed for detection of the total sum of NO<sub>y</sub>. First results of the performance of the TD-CAPS used for impurity analysis of NO<sub>2</sub> standards will be presented.</p><p> </p><p>Reference: Sadanaga et al. Review of Scientific Instruments 87.7 (2016), 074102</p>

Direct evidence for nitric oxide formation from glyceryl trinitrate during incubation with intact bovine pulmonary artery

1992 ◽  
Vol 70 (2) ◽  
pp. 308-311 ◽  
Author(s):  
Gerald S. Marks ◽  
Brian E. McLaughlin ◽  
Kanji Nakatsu ◽  
James F. Brien
Keyword(s):  
Nitric Oxide ◽  
Pulmonary Artery ◽  
Glyceryl Trinitrate ◽  
Direct Evidence ◽  
Oxide Formation ◽  
Chemiluminescence Method ◽  
Nitric Oxide Formation ◽  
Headspace Gas ◽  
Vasodilator Action ◽  
Chemiluminescence Detector

It has been proposed that the mechanism of the vasodilator action of glyceryl trinitrate (GTN) involves biotransformation to nitric oxide. A sensitive chemiluminescence method for nitric oxide determination was used to test this hypothesis. In four experiments, bovine pulmonary artery (BPA) was incubated with GTN (0.1 mM) in Krebs' solution (2 mL) containing 30 mM KCl, and in anaerobic conditions using 95% Ar – 5% CO2, in a sealed micro-Fernbach flask (6.2-mL volume). After incubation for 2, 5, 10, or 20 min at 37 °C, 400-μL aliquots of headspace gas were removed and injected into a redox chemiluminescence detector. Nitric oxide formation was first measurable at 5 min (76 ± 53 pmol/g wet wt. BPA), and increased with incubation time (174 ± 46 pmol/g wet wt. BPA after 10 min and 310 ± 67 pmol/g wet wt. BPA after 20 min). This is the first direct chemical measurement of nitric oxide formation during interaction of GTN with vascular smooth muscle. These data support the concept that GTN is a nitrovasodilator prodrug acting via the formation of nitric oxide.Key words: nitric oxide formation, glyceryl trinitrate, chemiluminescence, bovine pulmonary artery, vasodilation.

Thermal Dissociation Rate of CsF

1971 ◽  
Vol 55 (6) ◽  
pp. 2918-2921 ◽  
Author(s):  
A. Mandl
Keyword(s):  
Thermal Dissociation ◽  
Dissociation Rate
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