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Journal articles on the topic 'High O2 pressure'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

van Blankenstein, J. H., C. J. Slager, L. K. Soei, H. Boersma, and P. D. Verdouw. "Effect of arterial blood pressure and ventilation gases on cardiac depression induced by coronary air embolism." Journal of Applied Physiology 77, no. 4 (1994): 1896–902. http://dx.doi.org/10.1152/jappl.1994.77.4.1896.

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In this study the time course of cardiac depression after selective intracoronary injection of air bubbles was investigated in six anesthetized pigs (30 +/- 2 kg) with different mixtures of ventilation gases and different mean arterial blood pressures (MAP). Air bubbles of 150 microns diam were injected into the left anterior descending coronary artery (LADCA) in a volume of 2 microliters/kg body wt. In each animal an injection of air bubbles was applied during ventilation with N2-O2 and a MAP of 77 +/- 3 mmHg (N2-O2/low pressure) or 111 +/- 3 mmHg (N2-O2/high pressure) and during ventilation

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2

Azyazov, V. N., M. V. Zagidullin, V. D. Nikolaev, M. I. Svistun та N. A. Khvatov. "Transport of high-pressure O2(1Δ)". Quantum Electronics 24, № 3 (1994): 229–32. http://dx.doi.org/10.1070/qe1994v024n03abeh000059.

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3

Silva, S. M., R. C. Herner, and R. M. Beaudry. "407 Regulation of Carbon Flux as a Function of O2 and CO2 Atmospheres in Asparagus Tips." HortScience 34, no. 3 (1999): 514B—514. http://dx.doi.org/10.21273/hortsci.34.3.514b.

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The purpose of this work was to investigate the influence of O2 and CO2 partial pressures on glycolytic carbon flux, phosphorylated intermediates, phosphate, pyrophosphate, and phosporylated nucleotides in asparagus spears tips stores at 1 °C. The effects of CO2 (0, 5, 10, and 20 kPa) combined with O2 pressures ranging from 0.1 to 16 kPa (1% O2 = 1.013 kPa O2 at 1 atm) were investigated. Spears were enclosed within a low-density polyethylene (LDPE) package (for the 5-, 10-, and 20-kPa CO2 treatments) having a surface area of 462 cm2 and enclosed in 1.95-L glass jars. Low O2 enhanced the interc

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4

Levi, A., and D. Sasselov. "Partitioning of Atmospheric O₂ into High-pressure Ice in Ocean Worlds." Astrophysical Journal 926, no. 1 (2022): 72. http://dx.doi.org/10.3847/1538-4357/ac4500.

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Abstract Planets with a few percent water by mass may have a high-pressure ice mantle separating the rocky interior from both the ocean and atmosphere. Here we examine whether the partitioning of O2 into high-pressure ice can constrain the atmospheric abundance of O2 produced by water photolysis in the atmosphere. We find that the partition coefficient of dissolved O2 between high-pressure ice and liquid water is about unity. We show that the solubility of O2 in high-pressure water ice yields an upper value for the atmospheric abundance of O2 that depends on the ocean surface temperature. The

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5

Yang, Ming, Veena M. Bhopale, and Stephen R. Thom. "Separating the roles of nitrogen and oxygen in high pressure-induced blood-borne microparticle elevations, neutrophil activation, and vascular injury in mice." Journal of Applied Physiology 119, no. 3 (2015): 219–22. http://dx.doi.org/10.1152/japplphysiol.00384.2015.

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An elevation in levels of circulating microparticles (MPs) due to high air pressure exposure and the associated inflammatory changes and vascular injury that occur with it may be due to oxidative stress. We hypothesized that these responses arise due to elevated partial pressures of N2 and not because of high-pressure O2. A comparison was made among high-pressure air, normoxic high-pressure N2, and high-pressure O2 in causing an elevation in circulating annexin V-positive MPs, neutrophil activation, and vascular injury by assessing the leakage of high-molecular-weight dextran in a murine model

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6

Howland, R. J., and K. Newman. "A high-precision automatic closed-circuit respirometer for small animals." Journal of Applied Physiology 58, no. 3 (1985): 1031–33. http://dx.doi.org/10.1152/jappl.1985.58.3.1031.

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An automatic apparatus for the continuous measurement of O2 consumption of small laboratory animals is described. By use of a high-sensitivity pressure transducer with associated circuitry together with a peristaltic O2 delivery system, the closed respirometer chamber is maintained at atmospheric pressure +/- 0.5 mmH2O. O2 delivery is measured to within 0.25 ml by recording rotations of the peristaltic pump, following calibration by the withdrawal of a preset volume of air from the chamber. Static trials (with the chamber empty) indicate a high degree of reproducibility of data with the chambe

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7

Bjorling, Dale E., and Jeff B. Whitfield. "High-frequency jet ventilation during pneumothorax in dogs." American Journal of Veterinary Research 47, no. 9 (1986): 1984–87. https://doi.org/10.2460/ajvr.1986.47.09.1984.

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SUMMARY Pneumothorax (45 ml of N/kg of body weight insufflated into the pleural space) in anesthetized dogs ventilated with air caused a significant (P < 0.05) increase in pleural pressure, central venous pressure, capillary wedge pressure, and venous admixture. Cardiac index (ci) and arterial O2 tensions were decreased. Ventilation with 100% O2 increased arterial O2 tensions, but did not affect calculated intrapulmonary shunting of blood or ci. Application of 10 cm of H2O-positive end-expiratory pressure in the presence of pneumothorax during positive-pressure ventilation and high-frequenc

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8

Obrenovitch, T. P., and J. L. Gillard. "Decreased brain levels of ascorbic acid in rats exposed to high pressures." Journal of Applied Physiology 58, no. 3 (1985): 839–43. http://dx.doi.org/10.1152/jappl.1985.58.3.839.

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Ascorbic acid was repeatedly monitored in vivo in the striatum of rats subjected to an increasing pressure (100 bar/h compression rate; 0.5 bar partial pressure of O2 He-O2 mixture, up to 120 bar (121 ATA), to which they were exposed for 1 h. Measurements were performed using differential pulse voltammetry and carbon fiber microelectrodes. High-pressure-exposed animals exhibited a dramatic decrease of striatal ascorbic acid. This decrease was detectable at pressures as low as 50 bar and significant over 70 bar (75% of the control level), and the lower level (25% of the control level) was reach

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9

Rostain, J. C., M. C. Gardette-Chauffour, and R. Naquet. "Occurrence of high-pressure nervous syndrome at constant pressure during change of mixture." Journal of Applied Physiology 63, no. 5 (1987): 1919–25. http://dx.doi.org/10.1152/jappl.1987.63.5.1919.

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Three professional divers have performed a dive to 450 msw. From 200 msw and during the first 64 h on the bottom, they breathed a H2-He-O2 mixture with 54–56% H2. At this time a switch was performed to a mixture with 30% H2, and 8 h later a second switch was performed to 0% H2. In the H2-He-O2 mixture the clinical symptoms of high-pressure nervous syndrome (HPNS) were not present and the electroencephalogram changes were slight. The switch of the mixture induced an isobaric HPNS of high intensity. Twenty-four hours later the HPNS decreased, but the clinical symptoms persisted throughout the st

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10

Mills, S. J., and F. Nestola. "Elasticity and high-pressure structure of arsenoflorencite-(La): insights into the high-pressure behaviour of the alunite supergroup." Mineralogical Magazine 76, no. 4 (2012): 975–85. http://dx.doi.org/10.1180/minmag.2012.076.4.13.

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AbstractArsenoflorencite-(La), ideally LaAl3(AsO4)2(OH)6, was studied at high pressure by single-crystal X-ray diffractometry. The unit cell was determined at nine pressures up to 7.471(8) GPa; no evidence of a phase transformation was found in this range. The pressure volume data (refined simultaneously) were fitted to a third-order Birch Murnaghan equation of state which gave V0 = 710.71(8) Å3, KT0 = 106(2) GPa and K' = 9.2(9). These values were confirmed independently from an FE–fE plot. The crystal structure was refined at 1.596, 3.622, 5.749 and 7.471 GPa, the first time this has been don

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11

Reeves, J. T., B. M. Groves, J. R. Sutton, et al. "Operation Everest II: preservation of cardiac function at extreme altitude." Journal of Applied Physiology 63, no. 2 (1987): 531–39. http://dx.doi.org/10.1152/jappl.1987.63.2.531.

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Hypoxia at high altitude could depress cardiac function and decrease exercise capacity. If so, impaired cardiac function should occur with the extreme, chronic hypoxemia of the 40-day simulated climb of Mt. Everest (8,840 m, barometric pressure of 240 Torr, inspiratory O2 pressure of 43 Torr). In the five of eight subjects having resting and exercise measurements at the barometric pressures of 760 Torr (sea level), 347 Torr (6,100 m), 282 Torr (7,620 m), and 240 Torr, heart rate for a given O2 uptake was higher with more severe hypoxia. Slight (6 beats/min) slowing of the heart rate occurred o

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12

Loubeyre, Paul, and René LeToullec. "Stability of O2/H2 mixtures at high pressure." Nature 378, no. 6552 (1995): 44–46. http://dx.doi.org/10.1038/378044a0.

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13

Lundegaard, Lars F., Christophe Guillaume, Malcolm I. McMahon, Eugene Gregoryanz та Marco Merlini. "On the structure of high-pressure high-temperature η-O2". Journal of Chemical Physics 130, № 16 (2009): 164516. http://dx.doi.org/10.1063/1.3118970.

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14

Yamada, Y., A. Ito, K. Kuono, H. Yoshida, and Y. Kobayashi. "Laser deposition of iron in oxygen atmosphere." Proceedings in Radiochemistry 1, no. 1 (2011): 429–33. http://dx.doi.org/10.1524/rcpr.2011.0078.

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AbstractIron oxide films were produced by pulsed laser deposition (PLD) of 57Fe metal in an oxygen atmosphere and their compositions were studied by Mössbauer spectroscopy. The effects of gas-phase reactions were investigated by varying the pressure of O2 gas or an O2/Ar gas mixture. When PLD was performed in a high-pressure O2 atmosphere, the main product in the film was trivalent iron oxide particles. When the O2 pressure was reduced, hematite Fe2O3 became dominant in the film, while wüstite FeO was produced at very low O2 pressures. PLD in an O2/Ar gas mixture produced films of trivalent ir

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15

Groves, B. M., J. T. Reeves, J. R. Sutton, et al. "Operation Everest II: elevated high-altitude pulmonary resistance unresponsive to oxygen." Journal of Applied Physiology 63, no. 2 (1987): 521–30. http://dx.doi.org/10.1152/jappl.1987.63.2.521.

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High altitude increases pulmonary arterial pressure (PAP), but no measurements have been made in humans above 4,500 m. Eight male athletic volunteers were decompressed in a hypobaric chamber for 40 days to a barometric pressure (PB) of 240 Torr, equivalent to the summit of Mt. Everest. Serial hemodynamic measurements were made at PB 760 (sea level), 347 (6,100 m), and 282/240 Torr (7,620/8,840 m). Resting PAP and pulmonary vascular resistance (PVR) increased from sea level to maximal values at PB 282 Torr from 15 +/- 0.9 to 34 +/- 3.0 mmHg and from 1.2 +/- 0.1 to 4.3 +/- 0.3 mmHg.l–1 X min, re

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16

Babaeva, Natalia Y., Ramesh Arakoni та Mark J. Kushner. "O2(Δ1) production in high pressure flowing He∕O2 plasmas: Scaling and quenching". Journal of Applied Physics 101, № 12 (2007): 123306. http://dx.doi.org/10.1063/1.2743878.

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17

Petracek, Peter D., D. Frank Kelsey, and Craig Davis. "Response of Citrus Fruit to High-pressure Washing." Journal of the American Society for Horticultural Science 123, no. 4 (1998): 661–67. http://dx.doi.org/10.21273/jashs.123.4.661.

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The effect of high-pressure washing (HPW) on the surface morphology and physiology of citrus fruit was examined. Mature white (Citrus paradisi Macf. `Marsh') and red (Citrus paradisi Macf. `Ruby Red') grapefruit, oranges (Citrus sinensis L. `Hamlin'), and tangelos (Citrus reticulata Blanco × Citrus paradisi Macf. `Orlando') were washed on a roller brush bed and under a water spraying system for which water pressure was varied. Washing white grapefruit and oranges for 10 seconds under conventional low water pressure (345 kPa at cone nozzle) had little effect on peel wax fine structure. Washing

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18

Kowalski, Andrew S. "An elucidatory model of oxygen's partial pressure inside substomatal cavities." Biogeosciences 22, no. 3 (2025): 785–89. https://doi.org/10.5194/bg-22-785-2025.

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Abstract. A parsimonious model based on Dalton's law reveals substomatal cavities to be dilute in oxygen (O2), despite photosynthetic O2 production. Transpiration elevates the partial pressure of water vapour but counteractively depresses the partial pressures of dry air's components – proportionally including O2 – preserving cavity pressurization that is negligible as regards air composition. Suppression of O2 by humidification overwhelms photosynthetic enrichment, reducing the O2 molar fraction inside cool or warm leaves by hundreds or thousands of parts per million. This elucidates the mech

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19

Norins, Nan A., Karen Wendelberger, Raymond G. Hoffman, Peter A. Keller, and Jane A. Madden. "Effects of Indomethacin on Myogenic Contractile Activation and Responses to Changes in O2 and CO2 in Isolated Feline Cerebral Arteries." Journal of Cerebral Blood Flow & Metabolism 12, no. 5 (1992): 866–72. http://dx.doi.org/10.1038/jcbfm.1992.118.

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We used an isolated, pressurized, and perfused feline middle cerebral artery preparation to measure how changes in intraluminal pressure and alterations in O2 and CO2 affect vessel diameter and myogenic contractile activation before and after treatment with indomethacin (IND). Vessel diameters were measured over the pressure range 60–140 mm Hg. The arteries were then exposed to low O2 (50 torr) and/or high CO2 (65 torr) and diameters remeasured over the same range. Under control conditions, the arteries exhibited myogenic contractile activation. Exposure to low O2, high CO2, or a mixture of lo

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20

Qu, Lina, Zhenzhen Wang, and Long Liu. "Molecular Simulation Study Based on Adsorption of Gas (CO2,O2,CH4) on Coal." Fire 6, no. 9 (2023): 355. http://dx.doi.org/10.3390/fire6090355.

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This study aimed to further explore the adsorption properties of different gases (CO2, O2, and CH4) on the coking coal surface by establishing a molecular model. Changes in the absolute adsorption capacity and the isosteric heat of adsorption of gases under different temperatures, pressures, and compositions were simulated using grand canonical Monte Carlo (GCMC) and molecular dynamics simulations. Interaction energy and energy distribution were used to analyze the adsorption behavior of gases, and the diffusion properties were investigated using the diffusion coefficient and diffusion activat

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21

Burke, Michael P., Marcos Chaos, Yiguang Ju, Frederick L. Dryer, and Stephen J. Klippenstein. "Comprehensive H2 /O2 kinetic model for high-pressure combustion." International Journal of Chemical Kinetics 44, no. 7 (2011): 444–74. http://dx.doi.org/10.1002/kin.20603.

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22

Lin, Xueqiang, Wei Liu, Fei Wu, Chuanchuan Xu, Juanjuan Dou, and Minxu Lu. "Effect of O2 on corrosion of 3Cr steel in high temperature and high pressure CO2–O2 environment." Applied Surface Science 329 (February 2015): 104–15. http://dx.doi.org/10.1016/j.apsusc.2014.12.109.

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23

Beaudry, Randolph M. "EFFECT OF ELEVATED CARBON DIOXIDE LEVELS ON BLUEBERRY FRUIT RESPIRATION AND RESPIRATORY QUOTIENT." HortScience 27, no. 6 (1992): 676f—676. http://dx.doi.org/10.21273/hortsci.27.6.676f.

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Blueberry fruit were sealed in 0.00254 cm (1 mil) thick, 200 cm2 low density polyethylene pouches, which, in turn, were sealed in containers continually purged with gas mixtures containing 0, 20, 40 or 60 kPa CO2 and held at 15C. Sampling the gas composition of the enclosed package permitted accurate determination of O2 uptake, CO2 production and the respiratory quotient (RQ) despite the high background CO2 levels. O2 uptake was minimally affected by the CO2 treatments. CO2 production, however, increased at CO2 partial pressures over 20 kPa, resulting in an elevated RQ at 40 and 60 kPa CO2. Ra

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24

Fujiwara, Atsushi, Naoyuki Hatayama, Natsumi Matsuura, et al. "High-Pressure Carbon Monoxide and Oxygen Mixture is Effective for Lung Preservation." International Journal of Molecular Sciences 20, no. 11 (2019): 2719. http://dx.doi.org/10.3390/ijms20112719.

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(1) Background: Heme oxygenase-1 (HO-1) degrades heme and generates carbon monoxide (CO), producing various anti-inflammatory, anti-oxidative, and anti-apoptotic effects. This study aimed to confirm the effects of CO on the ischemia–reperfusion injury (IRI) of donor lungs using a high-pressure gas (HPG) preservation method. (2) Methods: Donor rat and canine lungs were preserved in a chamber filled with CO (1.5 atm) and oxygen (O2; 2 atm) and were ventilated with either CO and O2 mixture (CO/O2 group) or air (air group) immediately before storage. Rat lungs were subjected to heterotopic cervica

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25

Cowman, J., C. I. Torres, and B. E. Rittmann. "Total nitrogen removal in an aerobic/anoxic membrane biofilm reactor system." Water Science and Technology 52, no. 7 (2005): 115–20. http://dx.doi.org/10.2166/wst.2005.0189.

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The hydrogen-based membrane biofilm reactor (MBfR) is effective for reducing nitrate-N to N2 gas, but most wastewaters contain ammonium-N. Here, we document that an aerobic/anoxic MBfR system achieves nearly total N removal (&lt;2 mgN/L) when the influent N is ammonium. The aerobic/anoxic MBfR couples two MBfR modules. The aerobic MBfR is supplied O2 and brings about nitrification of ammonium to nitrate or nitrite. The anoxic MBfR is supplied H2 and brings about denitrification to N2 gas. Total N removal is most strongly influenced by the O2 pressure in the aerobic module: too low O2 cause

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26

Petracek, Peter D., and D. Frank Kelsey. "Physiological Responses of Citrus to High-pressure Washing." HortScience 30, no. 4 (1995): 804C—804. http://dx.doi.org/10.21273/hortsci.30.4.804c.

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High-pressure washing (>689 to 3446 kPa or 100 to 500 psi at the spray nozzle) has been used recently in citrus packinghouses to improve the action of surfactant solution and brushing on the removal of dirt and superficial molds. Although high-pressure washing has no obvious detrimental effect on citrus fruit (e.g., no cellular breakage), its effects on physiology have not been fully examined. In this study gas samples were taken from the fruit core of `Orlando' tangelos, `Hamlin' oranges, and `Ruby Red' and white `Marsh' grapefruit prior to and following washing. An apparent wound ethylene

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27

Brauer, R. W., J. A. Dutcher, W. Hinson, and W. S. Vorus. "Prolonged exposure of mice to He-O2 at high pressure: effects on seizure and anesthesia liability." Journal of Applied Physiology 61, no. 6 (1986): 2005–11. http://dx.doi.org/10.1152/jappl.1986.61.6.2005.

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Multiday exposures of CD-1 mice to He-O2 atmospheres at pressures from 30 to 100 atm result in marked increases of threshold pressures for type I high-pressure neurological syndrome seizures. The effect develops with a half time (t1/2) of 12 h and is reversible (t1/2 = 7 h). The maximum enhancement of Pc is attained at a conditioning pressure of 80 ATA. Pressure conditioning also results in suppression of the compression rate effect on Pc. Furthermore, reserpine blocks the increase in Pc during prolonged pressure exposure. The entire effect thus appears to be an extension in time of the monoam

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28

Groves, B. M., T. Droma, J. R. Sutton, et al. "Minimal hypoxic pulmonary hypertension in normal Tibetans at 3,658 m." Journal of Applied Physiology 74, no. 1 (1993): 312–18. http://dx.doi.org/10.1152/jappl.1993.74.1.312.

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Elevated pulmonary arterial pressure in high-altitude residents may be a maladaptive response to chronic hypoxia. If so, well-adapted populations would be expected to have pulmonary arterial pressures that are similar to sea-level values. Five normal male 22-yr-old lifelong residents of > or = 3,600 m who were of Tibetan descent were studied in Lhasa (3,658 m) at rest and during near-maximal upright ergometer exercise. We found that resting mean pulmonary arterial pressure [15 +/- 1 (SE) mmHg] and pulmonary vascular resistance (1.8 +/- 0.2 Wood units) were within sea-level norms and were li

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29

Tentori, Egidio F., Nan Wang, Caroline J. Devin, and Ruth E. Richardson. "Treatment of Anaerobic Digester Liquids via Membrane Biofilm Reactors: Simultaneous Aerobic Methanotrophy and Nitrogen Removal." Microorganisms 12, no. 9 (2024): 1841. http://dx.doi.org/10.3390/microorganisms12091841.

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Anaerobic digestion (AD) produces useful biogas and waste streams with high levels of dissolved methane (CH4) and ammonium (NH4+), among other nutrients. Membrane biofilm reactors (MBfRs), which support dissolved methane oxidation in the same reactor as simultaneous nitrification and denitrification (ME-SND), are a potential bubble-less treatment method. Here, we demonstrate ME-SND taking place in single-stage, AD digestate liquid-fed MBfRs, where oxygen (O2) and supplemental CH4 were delivered via pressurized membranes. The effects of two O2 pressures, leading to different O2 fluxes, on CH4 a

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30

Samaja, Michele, Sonia Allibardi, Giuseppina Milano, et al. "Differential depression of myocardial function and metabolism by lactate and H+." American Journal of Physiology-Heart and Circulatory Physiology 276, no. 1 (1999): H3—H8. http://dx.doi.org/10.1152/ajpheart.1999.276.1.h3.

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The effects of both high blood H+ concentration ([H+]) and high blood lactate concentration ([lactate]) under ischemia-reperfusion conditions are receiving attention, but little is known about their effects in nonischemic hearts. Isolated rat hearts were Langendorff perfused at constant flow with media at two pH values (7.4 and 7.0) and two [lactate] (0 and 20 mM) in various sequences ( n = 6/group). Coronary flow and arterial O2content were kept constant at levels that allowed hearts to function without O2 supply limitation. We measured contractility, O2 uptake, diastolic pressure, and at the

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Akashi, T., Miho Kasajima, Chiharu Muraoka, and Hajime Kiyono. "High Temperature Oxidation of SiC Powder in Oxidizing Atmosphere Containing Water Vapor." Key Engineering Materials 403 (December 2008): 197–200. http://dx.doi.org/10.4028/www.scientific.net/kem.403.197.

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Oxidation of SiC powder was studied at 1373 K to 1873 K in Ar-O2, Ar-H2O, and Ar-O2-H2O using thermogravimetry. At 1373 K to 1573K, the weight gain increased with increasing water vapor pressure. The oxidation rate was evaluated on the basis of the Ginstering-Brounshtein kinetic model. In this temperature region, the apparent activation energy for the oxidation was almost the same (139-191 kJmol-1) independent of the atmosphere, suggesting that the same oxidation process proceeds. On the other hand, at temperatures >1673 K, the weight gain in the dry O2 (Ar-O2) was greater than that in the

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32

Lafumat, Bénédicte, Christoph Mueller-Dieckmann, Gordon Leonard, et al. "Gas-sensitive biological crystals processed in pressurized oxygen and krypton atmospheres: deciphering gas channels in proteins using a novel `soak-and-freeze' methodology." Journal of Applied Crystallography 49, no. 5 (2016): 1478–87. http://dx.doi.org/10.1107/s1600576716010992.

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Molecular oxygen (O2) is a key player in many fundamental biological processes. However, the combination of the labile nature and poor affinity of O2 often makes this substrate difficult to introduce into crystals at sufficient concentrations to enable protein/O2 interactions to be deciphered in sufficient detail. To overcome this problem, a gas pressure cell has been developed specifically for the `soak-and-freeze' preparation of crystals of O2-dependent biological molecules. The `soak-and-freeze' method uses high pressure to introduce oxygen molecules or krypton atoms (O2 mimics) into crysta

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33

Peng Qingjun, 彭庆军, 司马文霞 Sima Wenxia, 杨庆 Yang Qing, et al. "Simulation of capacitively coupled high-pressure glow discharge in He-O2." High Power Laser and Particle Beams 24, no. 12 (2012): 2841–47. http://dx.doi.org/10.3788/hplpb20122412.2841.

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34

Malyshenko, S. "High-pressure H2/O2-steam generators and their possible applications." International Journal of Hydrogen Energy 29, no. 6 (2004): 589–96. http://dx.doi.org/10.1016/j.ijhydene.2003.08.004.

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35

Jacobson, Azita, Changdong Yan, Qun Gao, et al. "Aging enhances pressure-induced arterial superoxide formation." American Journal of Physiology-Heart and Circulatory Physiology 293, no. 3 (2007): H1344—H1350. http://dx.doi.org/10.1152/ajpheart.00413.2007.

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The purpose of this study was to investigate the mechanisms that regulate superoxide (O2•−) production as a function of an acute elevation of intravascular pressure and age. Mesenteric arteries isolated from young (6 mo) and aged (24 mo) male Fischer 344 rats were used. O2•− production in vessels in response to 80 (normal pressure, NP) and 180 (high pressure, HP) mmHg was determined by the superoxide dismutase-inhibitable nitroblue tetrazolium (NBT) reduction assay. In vessels exposed to NP, O2•− production was significantly higher in aged than in young vessels (32.7 ± 7.0 vs. 15.4 ± 2.4 nmol·

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36

Jin, Zhao, Jing Liu, and Yichao Ma. "Explosible Oxygen Concentration and Lower Explosion Limit of RP-3 Aviation Kerosene Vapor/O₂/N₂ Mixtures at Elevated Pressure and High temperature." Journal of Physics: Conference Series 2569, no. 1 (2023): 012024. http://dx.doi.org/10.1088/1742-6596/2569/1/012024.

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Abstract RP-3 aviation kerosene is widely used in China, and the critical explosible oxygen concentration (COC) and lower explosion limit (LEL) are important parameters concerned about aviation safety. The COC and LEL characteristics of RP-3 aviation kerosene vapor/O2/N2 mixtures at different initial temperatures and pressure were investigated experimentally. The LEL for RP-3 vapor/O2/N2 mixtures ranges from 0.5 vol% to 0.6 vol%, with the ambient pressure ranging from 40 kPa to 100 kPa, temperature from 60°C to 150°C, which is almost unchanged. The COC decreases as the temperature and pressure

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37

Li, Jun, Raheel Ahmed, and Xiaochun Li. "Thermodynamic Modeling of CO2-N2-O2-Brine-Carbonates in Conditions from Surface to High Temperature and Pressure." Energies 11, no. 10 (2018): 2627. http://dx.doi.org/10.3390/en11102627.

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Nitrogen (N2) and oxygen (O2) are important impurities obtained from carbon dioxide (CO2) capture procedures. Thermodynamic modeling of CO2-N2-O2-brine-minerals is important work for understanding the geochemical change of CO2 geologic storage with impurities. In this work, a thermodynamic model of the CO2-N2-O2-brine-carbonate system is established using the “fugacity-activity” method, i.e., gas fugacity coefficients are calculated using a cubic model and activity coefficients are calculated using the Pitzer model. The model can calculate the properties at an equilibrium state of the CO2-N2-O

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Prikhna, Tetiana, Aiswarya Kethamkuzhi, Roxana Vlad, et al. "Post-oxygenation under high pressure of superconducting EuBCO and GdBCO coated conductors." IOP Conference Series: Materials Science and Engineering 1327, no. 1 (2025): 012200. https://doi.org/10.1088/1757-899x/1327/1/012200.

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Abstract Treatment of GdBCO_CC under 100 bar of O2 at 600 °C for 3 h led to an increase in J c (77K, 0 T) by 6% up to 2.67 MA/cm2 and a decrease in the c-parameter of Gd123 to 1.17310 nm, which may be associated with its overdoping with oxygen (the charge carrier density in superconducting Gd123 layer was 6.91×1021 cm3). No strong correlation was observed between J c, T c, c-parameter of RE123 (RE=Eu, Gd) and carrier density n H of EuBCO_CC and GdBCO_CC treated at 300-800 °C, 1-160 bar O2 for 3-12 h.

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Piliai, Lesia, David Tomeček, Martin Hruška, et al. "New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors." Sensors 20, no. 19 (2020): 5602. http://dx.doi.org/10.3390/s20195602.

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In this work, we investigate ethanol (EtOH)-sensing mechanisms of a ZnO nanorod (NRs)-based chemiresistor using a near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). First, the ZnO NRs-based sensor was constructed, showing good performance on interaction with 100 ppm of EtOH in the ambient air at 327 °C. Then, the same ZnO NRs film was investigated by NAP-XPS in the presence of 1 mbar oxygen, simulating the ambient air atmosphere and O2/EtOH mixture at the same temperature. The partial pressure of EtOH was 0.1 mbar, which corresponded to the partial pressure of 100 ppm of analyte

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Sahin, Mazlum, Helin El, and Ibrahim Akkoç. "Comparison of Mask Oxygen Therapy and High-Flow Oxygen Therapy after Cardiopulmonary Bypass in Obese Patients." Canadian Respiratory Journal 2018 (2018): 1–7. http://dx.doi.org/10.1155/2018/1039635.

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Background. To clarify the efficiency of mask O2 and high-flow O2 (HFO) treatments following cardiopulmonary bypass (CPB) in obese patients. Methods. During follow-up, oxygenization parameters including arterial pressure of oxygen (PaO2), peripheral oxygen saturation (SpO2), and arterial partial pressure of carbon dioxide (PaCO2) and physical examination parameters including respiratory rate, heart rate, and arterial pressure were recorded respectively. Presence of atelectasia and dyspnea was noted. Also, comfort scores of patients were evaluated. Results. Mean duration of hospital stay was 6.

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Khedekar, Kaustubh, Christopher Evan Van Pelt, Ryan Gebhardt, et al. "Understanding Gas Permeation during High Pressure Operation of PEM Water Electrolyzers." ECS Meeting Abstracts MA2022-02, no. 44 (2022): 1662. http://dx.doi.org/10.1149/ma2022-02441662mtgabs.

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Governments and industries across the world have initiated implementation of clean hydrogen (H2) to achieve zero emissions, yet significant challenges remain for large scale adoption. With the decreasing renewable electricity cost PEM water electrolyzers (PEMWEs) show significant potential for at scale deployment due to their high faradaic efficiency and high operating current density. To reduce the per kilogram price of hydrogen and increase the overall energy efficiency, PEMWEs need to be operated at high differential pressures (30 to 50 bar) to eliminate the need for compression during stor

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Dong, Zicheng, Aihan Feng, Hao Wang, Shoujiang Qu, and Hao Wang. "Thermodynamic Study on Initial Oxidation Behavior of TiAl-Nb Alloys at High Temperature." Metals 13, no. 3 (2023): 485. http://dx.doi.org/10.3390/met13030485.

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The initial oxidation behavior of TiAl-Nb alloys was systematically investigated against the composition, temperature, and partial pressure of O2 with the CALculation of PHAse Diagrams (CALPHAD) technique. The mole fraction of each oxidation product at the initial oxidation stage of the alloys at the corresponding temperatures was predicted. The initial oxidation products of the alloys are oxides of Al, Ti, and Nb, with the oxidation order of Al, Ti, and Nb. As P(O2) increases, the Ti and Nb oxidation products move towards a high oxygen content, and the mole fractions of the Al and Ti oxides g

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Gran, Christopher D., and Randolph M. Beaudry. "DETERMINATION OF LOW OXYGEN TOLERANCE LIMITS FOR SEVERAL APPLE CULTIVARS." HortScience 27, no. 6 (1992): 592g—593. http://dx.doi.org/10.21273/hortsci.27.6.592g.

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The oxygen partial pressure associated with the respiratory quotient (RQ) breakpoint (ie., lower oxygen limit) was determined for fruits of several apple cultivars stored at 0°C. Fruits were sealed in low density polyethylene pouches of various thicknesses and known permeability to determine O2 uptake, CO2 production, and respiratory quotients (RQ) at various O2 partial pressures. There were differences in the shape of O2 uptake versus steady state O2 curves between cultivars. While some cultivars showed steady declines in respiration rate from 8 kPa O2 to < 1 kPa, other cultivars showed no

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Peterson, Sharon J., Werner J. Lipton, and Masami Uota. "Methods for Premixing Gases in Pressurized Cylinders for Use in Controlled Atmosphere Experiments." HortScience 24, no. 2 (1989): 328–31. http://dx.doi.org/10.21273/hortsci.24.2.328.

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Abstract Methods for mixing various concentrations of O2, CO2, N2, and C2H4 in high-pressure cylinders are described. The concentrations are mixed by partial pressure or partial volume and then are verified by gas chromatography. The procedures generally allow for a precision of ±5% when either 1.0% O2 or CO2 or higher concentrations are mixed with N2 or when C2H4 at 100 µl·liter-1, or more, is added. For lower concentrations, or when both O2 and CO2 are combined with N2, then the precision is ±10%.

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Argo, William R., John A. Biernbaum, and William C. Fonteno. "Root Medium Carbon Dioxide and Oxygen Partial Pressures for Container-grown Chrysanthemums." HortScience 31, no. 3 (1996): 385–88. http://dx.doi.org/10.21273/hortsci.31.3.385.

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Medium CO2 and O2 partial pressures were measured at three locations [3.8 (top layer), 7.5 (middle layer), and 10.3 (bottom layer) cm below the rim] in 15-cm-tall pots containing flowering chrysanthemums [Dendranthem×grandiflorum (Ramat.) Kitamura] grown in one of three root media. Average ambient medium CO2 and O2 partial pressures were 63 Pa and 21 kPa, respectively, and were similar in the three sampled layers in root media with an average moisture content of 50% to 60% of container capacity. Within 10 minutes after a drip-irrigation application of well water containing a titratable alkalin

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Guilloy, Kevin, Nicolas Pauc, Alban Gassenq, and Vincent Calvo. "High aspect ratio germanium nanowires obtained by dry etching." MRS Advances 1, no. 13 (2016): 875–80. http://dx.doi.org/10.1557/adv.2016.159.

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ABSTRACTWe present here a reactive ion etching recipe to fabricate germanium nanowires. We used a combination of Cl2, N2 and O2 and studied the influence of both the gas pressure and the O2 mass flow on the morphology of the nanowires. 5 µm long nanowires with an aspect ratio of 20 are demonstrated with smooth surfaces and a tapering below 20 nm/µm. We also show that both gold and aluminum can be used as hard mask; the latter achieving a selectivity with germanium above 100.

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Zagidullin, M. V., N. V. Erasov, A. Yu Kurov, V. D. Nikolaev, M. I. Svistun та N. A. Khvatov. "An oxygen–iodine laser utilizing a high-pressure O2(1Δ) generator". Soviet Journal of Quantum Electronics 21, № 12 (1991): 1303–4. http://dx.doi.org/10.1070/qe1991v021n12abeh004527.

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Grosso Ferreira, R., B. Carvalho, J. Rodrigues, et al. "Unfocused laser ignition of high-pressure He–H2-O2 combustible mixtures." International Journal of Hydrogen Energy 58 (March 2024): 948–53. http://dx.doi.org/10.1016/j.ijhydene.2024.01.271.

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Makarov, A. F., M. A. Kotsky, А. А. Ton'shin, and I. V. Bukhtiyarov. "ARTIFICIAL HYPOBIOSIS AS A METHOD TO MITIGATE THE NEGATIVE EFFECT OF OXYGEN AT AN ELEVATED PARTIAL PRESSURE." Aerospace and Environmental Medicine 55, no. 5 (2021): 64–68. http://dx.doi.org/10.21687/0233-528x-2021-55-5-64-68.

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To assess how hypobiosis modifies the negative effect of a high partial pressure of oxygen, goldhamsters were put into artificial hypobiosis followed by a simulated O2 poisoning at absolute gas pressure of 7 kgf/cm2. The experiment showed an increase in 1.4 times (p = 0.0579) of the period preceding convulsions; reduction in 3.7 times (p = 0.0009) of the period of stabilization on return to normal O2 pressure, reduction of the total convulsions period in 2.3 times (p = 0.0003).

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Cala, S. J., J. Edyvean, M. Rynn, and L. A. Engel. "O2 cost of breathing: ventilatory vs. pressure loads." Journal of Applied Physiology 73, no. 5 (1992): 1720–27. http://dx.doi.org/10.1152/jappl.1992.73.5.1720.

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We compared the O2 cost of breathing (VO2resp) at high levels of ventilation (HV) with that against high inspiratory pressure loads (HP) using an external elastance when end-expiratory volume, work rate (W), and pressure-time product (P) were matched at two levels of ventilation and elastic loading. Each of five normal subjects performed three pairs of loaded runs (one HV and one HP) bracketed by two resting runs. Mean O2 consumption from the pairs of resting runs was subtracted from that of each of the loaded runs to give VO2resp during loaded breathing. Matching for W and P was within 15% in

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