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Journal articles on the topic 'Adequate gas exchange'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Wong, Kevin A., Ather Bano, Anita Rigaux, et al. "Pulmonary vagal innervation is required to establish adequate alveolar ventilation in the newborn lamb." Journal of Applied Physiology 85, no. 3 (1998): 849–59. http://dx.doi.org/10.1152/jappl.1998.85.3.849.

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To investigate the effects of bilateral intrathoracic vagotomy on the establishment of continuous breathing and effective gas exchange at birth, we studied 8 chronically instrumented, unanesthetized, sham-operated and 14 vagotomized newborn lambs after a spontaneous, unassisted vaginal delivery. Fetal lambs were instrumented in utero to record sleep states, diaphragmatic electromyogram, blood pressure, arterial pH, and blood-gas tensions. Six of eight sham-operated lambs established effective gas exchange within 10 min of birth, whereas 12 of 14 vagotomized animals developed respiratory acidos

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2

Aleksandrovich, Yu S., S. B. Dalzhinova, K. V. Pshenisnov, and I. V. Aleksandrovich. "Non-invasive ventilation provides adequate gas exchange minimizing pulmonary and extrapulmonary complications." Messenger of ANESTHESIOLOGY AND RESUSCITATION 17, no. 6 (2020): 22–30. http://dx.doi.org/10.21292/2078-5658-2020-17-6-22-30.

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3

Chung, Mabel, Ariel L. Shiloh, and Anthony Carlese. "Monitoring of the Adult Patient on Venoarterial Extracorporeal Membrane Oxygenation." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/393258.

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Venoarterial extracorporeal membrane oxygenation (VA ECMO) provides mechanical support to the patient with cardiac or cardiopulmonary failure. This paper reviews the physiology of VA ECMO including the determinants of ECMO flow and gas exchange. The efficacy of this therapy may be determined by assessing patient hemodynamics and device flow, overall gas exchange support, markers of adequate oxygen delivery, and pulsatility of the arterial blood pressure waveform.

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4

Hasibuan, Sri Rahayu, Mayza Hanif Abbad Mahardika, Adnan Dahiya Addaruqutni, and Fitri Kartiasih. "Determination of macroeconomic factors on Indonesia's oil and gas imports: an ECM approach." Journal of Economics Research and Policy Studies 5, no. 2 (2025): 303–21. https://doi.org/10.53088/jerps.v5i2.1693.

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The oil and gas trade deficit can negatively impact Indonesia’s economy in the long term, highlighting the need to identify key factors influencing oil and gas imports. This study analyzes the effects of inflation, exchange rates, and foreign exchange reserves on oil and gas imports using the Error Correction Model (ECM), which captures both short-term and long-term dynamics. Monthly data from January 2003 to December 2023 were used, with a natural logarithm transformation applied to address non-stationarity. The results show that, in the long term, inflation and foreign exchange reserves sign

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Agusti, AG, and R. Rodriguez-Roisin. "Effect of pulmonary hypertension on gas exchange." European Respiratory Journal 6, no. 9 (1993): 1371–77. http://dx.doi.org/10.1183/09031936.93.06091371.

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This paper reviews the effects of pulmonary artery hypertension on gas exchange by exploring three different issues, namely: 1) how does gas exchange behave in diseases characterized by increased vascular tone (primary pulmonary hypertension (PPH), chronic obstructive pulmonary disease (COPD) and interstitial pulmonary fibrosis (IPF)) or decreased vascular tone ("hepatopulmonary syndrome"); 2) how does exercise, as a non-pharmacological tool of increasing pulmonary blood flow, modify gas exchange in these diseases; and 3) how do several drugs that lower (vasodilators) or increase (almitrine) t

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Calderón, M., R. Verdín, J. Galván, et al. "Low Flow Veno-Venous ECMO: An Experimental Study." Journal of ExtraCorporeal Technology 26, no. 2 (1994): 75–78. http://dx.doi.org/10.1051/ject/199426275.

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Clinical use of extracorporeal membrane oxygenation (ECMO) and carbon dioxide removal (ECCO2R) have become well established techniques for the treatment of severe respiratory failure; however they require full cardiopulmonary bypass, representing major procedures with high morbidity. We theorized the possibility of an efficient low flow venavenous extracorporeal membrane gas exchange method. Four mongrel 12kg dogs were submitted to vena-venous extracorporeal membrane gas exchange via a jugular dialysis catheter using a low flow (10 ml/min) roller pump and a membrane oxygenator for a period of

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7

Wünsche, Jens N., and John W. Palmer. "Portable Through-flow Cuvette System for Measuring Whole-canopy Gas Exchange of Apple Trees in the Field." HortScience 32, no. 4 (1997): 653–58. http://dx.doi.org/10.21273/hortsci.32.4.653.

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A monitoring and control system for sequentially measuring whole-tree-canopy gas exchange of four apple (Malus domestica Borkh.) trees in the field is described. A portable, highly transparent, open-top whole-canopy cuvette was developed for complete enclosure of the above-ground portion of the tree. The flux of whole-canopy CO2 and H2 0 vapor was estimated from differential CO2 concentration and H2O-vapor partial pressure between ambient/reference air entering the cuvette and analysis air leaving the cuvette, as measured by infrared gas analysis. The bulk air-flow rate through the chamber was

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8

Udoudo, Kufre Jerome, Ijeoma Emele Kalu, and Koyejo Oduola. "Impact of Liquefied Natural Gas Exports on the Nigerian Exchange Rate: An ARDL Cointegration Approach, 2000 to 2021." American Journal of Applied Statistics and Economics 3, no. 1 (2023): 1–14. http://dx.doi.org/10.54536/ajase.v3i1.2216.

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This study aimed to investigate the impact of liquefied natural gas (LNG) exports on the exchange rate of Nigeria. The investigation employed an autoregressive distributed lag model (ARDL) methodology to analyse data spanning the years 2000 to 2021 using a biannual dataset. The empirical findings provided evidence of a statistically significant and positive influence of liquefied natural gas exports on the exchange rate. This is supported by the results obtained from the short-term analysis. The research results revealed no causal link between the exports of LNG and the exchange rate in Nigeri

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9

Pelletier, Vincent, Steeve Pepin, Thomas Laurent, Jacques Gallichand, and Jean Caron. "Cranberry Gas Exchange under Short-term Hypoxic Soil Conditions." HortScience 51, no. 7 (2016): 910–14. http://dx.doi.org/10.21273/hortsci.51.7.910.

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Cranberries were grown under controlled environmental conditions to determine the effects of soil waterlogging on cranberry gas exchange in three growth stages and to investigate the recovery time after waterlogging. Photosynthesis declined by 28% after the first day of waterlogging at the bud elongation stage and was 46% lower after the fifth day. At the flowering stage, the reduction in photosynthesis started to be significant only after the fifth day, whereas no reduction was observed at the fruit development stage. Stomatal limitations were responsible, in part, for the observed decrease i

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10

Wenneck, Gustavo Soares, Reni Saath, Roberto Rezende, et al. "Silicon Application Contributes to Efficient Gas Exchange in Tomato Plants." Journal of Sustainable Development 17, no. 6 (2024): 110. http://dx.doi.org/10.5539/jsd.v17n6p110.

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The study aimed to analyze the effect of silicon application on tomato crops subjected to different water management conditions. The experiment was conducted in a completely randomized design with two water replacement conditions (60 and 100% of crop evapotranspiration - ETc), four forms of silicon application (no application, full-dose soil application, split soil application and foliar application) with four replicates. When the plants were in the reproductive stage, gas exchange analysis was performed in two periods (critical period before water replacement and after water replacement). The

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11

Bernasconi, Filippo, and Federico Piccioni. "One-lung Ventilation for Thoracic Surgery: Current Perspectives." Tumori Journal 103, no. 6 (2017): 495–503. http://dx.doi.org/10.5301/tj.5000638.

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One-lung ventilation (OLV) is an anesthesiological technique that is increasingly being used beyond thoracic surgery. This requires specific skills and knowledge about airway management, maintenance of gas exchange and prevention of acute lung injury. Sometimes maintaining adequate gas exchange and minimizing acute lung injury may be opposing processes. Parameters validated for OLV titration still have not been found, but a multimodal approach based on low tidal volume, end-expiratory pressure application and alveolar recruitment maneuvers is considered the best way to ensure protective ventil

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12

Mansarliysky, V. F. "NEW RELATIVISTIC APPROACH TO CALCULATING THE HYPERFINE LINE SHIFT AND BROADENING FOR HEAVY ATOMS IN THE BUFFER GAS." Photoelectronics, no. 25 (December 26, 2016): 73–78. http://dx.doi.org/10.18524/0235-2435.2016.25.157625.

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It is presented a new consistent relativistic approach to hyperfine structure line collision shift and broadening for heavy atoms in an atmosphere of the buffer inert gas, based on the atomic gauge-invariant relativistic perturbation theory and the optimal construction of the interatomic potential function within exchange perturbation theory. As illustration it is applied to calculating the interatomic potentials, hyperfine structure line collision shift for heavy atoms in an atmosphere of the buffer inert gas. The accurate account for the relativistic and exchange-correlation and continuum pr

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13

Burrowes, K. S., A. J. Swan, N. J. Warren, and M. H. Tawhai. "Towards a virtual lung: multi-scale, multi-physics modelling of the pulmonary system." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 366, no. 1879 (2008): 3247–63. http://dx.doi.org/10.1098/rsta.2008.0073.

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The essential function of the lung, gas exchange, is dependent on adequate matching of ventilation and perfusion, where air and blood are delivered through complex branching systems exposed to regionally varying transpulmonary and transmural pressures. Structure and function in the lung are intimately related, yet computational models in pulmonary physiology usually simplify or neglect structure. The geometries of the airway and vascular systems and their interaction with parenchymal tissue have an important bearing on regional distributions of air and blood, and therefore on whole lung gas ex

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Rabhi, Mokded, Deborah Giuntini, Antonella Castagna, et al. "Sesuvium portulacastrum maintains adequate gas exchange, pigment composition, and thylakoid proteins under moderate and high salinity." Journal of Plant Physiology 167, no. 16 (2010): 1336–41. http://dx.doi.org/10.1016/j.jplph.2010.05.009.

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15

Rosales-Velderrain, Armando, Abraham Betancourt, and Fuad Alkhoury. "Laparoscopic Repair of Duodenal Atresia in a Low Birth Weight Neonate." American Surgeon 80, no. 9 (2014): 834–35. http://dx.doi.org/10.1177/000313481408000910.

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The small volume of the infant abdomen limits the application of laparoscopic procedures. We successfully repaired a duodenal atresia in a 2-kg female infant using a standard diamond-shaped anastomosis and intracorporeal suturing and knot-tying techniques. Anesthesia and positive pressure ventilation assured adequate gas exchange during pneumoperitoneum during the procedure.

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16

Wang, Liang, Yun Jia, Yu Tan, and Bin Ding. "Numerical Investigation of Heat Transfer Characteristics Between Thermochemical Heat Storage Materials and Compressed Natural Gas in a Moving Bed." Processes 13, no. 1 (2024): 8. https://doi.org/10.3390/pr13010008.

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To promote energy conservation and a low-carbon approach in natural gas storage, efficient methods for utilizing waste heat during gas injection and maintaining adequate cooling rates are crucial. This study developed a three-dimensional model integrating the desorption process of hydrated salts to analyze temperature and flow fields within a moving bed during heat exchange. This study systematically evaluated the effects of operating parameters on key outcomes, including the outlet temperatures of hydrated salts and natural gas, as well as the waste heat recovery ratio. Results indicated that

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17

Tikhonova, S. N., D. A. Rozenko, N. D. Ushakova, et al. "Optimization of anesthetic tactics in the surgical treatment of multiple primary non-small cell lung cancer." South Russian Journal of Cancer 2, no. 2 (2021): 42–49. http://dx.doi.org/10.37748/2686-9039-2021-2-2-5.

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The article describes a clinical case of surgical treatment of a patient with multiple primary malignant lesions of the lungs (cancer of the left lung, central peribronchial nodular tumor with involvement of the upper lobe and distal parts of the main bronchus; cancer of the right lung, central tumor with involvement of the upper lobar bronchus). Radical treatment became possible due to using the potential of artifi cial gas exchange of both lungs with two devices with fundamentally different ventilation mechanics. The choice of an optimal tactics for the functional correction of the supposed

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18

Wang, T., D. R. Carrier, and J. W. Hicks. "Ventilation and gas exchange in lizards during treadmill exercise." Journal of Experimental Biology 200, no. 20 (1997): 2629–39. http://dx.doi.org/10.1242/jeb.200.20.2629.

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The extent to which lizards ventilate their lungs during locomotion is controversial. Direct measurements of airflow across the nostrils suggest a progressive reduction in tidal volume and minute ventilation with increased running speed, while other studies have demonstrated that arterial PO2 remains constant during exercise. To resolve these conflicting findings, we measured minute ventilation and gas exchange rate in five specimens of Varanus exanthematicus and five specimens of Iguana iguana during treadmill locomotion at speeds between 0.14 and 1.11ms-1 at 35 degrees C. These speeds are mu

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19

Costantino, Mi. "The Use of Liquid Perfluorocarbons for Neonatal Lung Ventilation." International Journal of Artificial Organs 19, no. 5 (1996): 284–90. http://dx.doi.org/10.1177/039139889601900505.

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Over the last years, physiological studies have proved that ventilation with a oxygenated liquid perfluorocarbon (PFC) provides effective gas exchange and acid base balance and improves lung function and recovery Low surface tension and high respiratory gas solubility enable adequate oxygenation and carbon dioxide removal at low insufflation pressure. The elimination of air-liquid interfacial surface tension has recently suggested the adoption of total liquid PFC ventilation as an investigational therapy for severe respiratory distress in human infants. This work is aimed to determine the opti

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20

Souza, Álvaro Henrique Cândido de, Roberto Rezende, Marcelo Zolin Lorenzoni, Fernando André Silva Santos, and André Maller. "Effect of fertigation with potassium and nitrogen on gas exchange and biomass accumulation in eggplant1." Pesquisa Agropecuária Tropical 47, no. 3 (2017): 345–52. http://dx.doi.org/10.1590/1983-40632016v4747885.

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ABSTRACT Adequate crop fertilization is one of the challenges for agriculture. Measuring gas exchange and biomass accumulation may be used to adjust crop management. The effect of fertigation with potassium (0 kg ha-1, 54 kg ha-1, 108 kg ha-1 and 216 kg ha-1) and nitrogen (0 kg ha-1, 67 kg ha-1, 134 kg ha-1 and 268 kg ha-1) on gas exchange and biomass accumulation in eggplant was assessed under greenhouse conditions. The net photosynthesis, stomatal conductance, transpiration, internal CO2 concentration, instantaneous carboxylation efficiency, water-use efficiency and total dry weight were eva

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21

Rozenko, D. A., M. A. Engibaryan, D. A. Kharagezov, et al. "Characteristics of anesthetic and surgical tactics in treatment of a patient with a giant thyroid mass in a cancer center (clinical case)." South Russian Journal of Cancer 5, no. 1 (2024): 42–51. http://dx.doi.org/10.37748/2686-9039-2024-5-1-5.

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This paper describes an example of radical surgical treatment of a patient with a giant retrosternal goiter complicated by compression of the organs of the neck and mediastinum. Considering all the risks and possible complications, we should take into account the fact that enlarged thyroid (T) body with retrosternal location can cause displacement and stenosis of the trachea and esophagus, and dislocation of large vessels and nerves of the mediastinum. This anatomical specificity is an imminent threat to successful treatment, and it also carries a certain risk of asphyxia and sudden death of t

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22

Shenoy, Anitha. "Postextubation stridor in the ICU." Indian Journal of Respiratory Care 06, no. 01 (2022): 777–80. http://dx.doi.org/10.5005/jp-journals-11010-06107.

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Endotracheal intubation is one of the commonest procedures performed in the intensive care unit. Once the requirement of the tube is no longer present and the patient has recovered the ability to maintain airway, clear secretions and has adequate gas exchange, extubation is done. Occasionally, the patients can develop postextubation stridor. This CME article describes the various causes of postextubation stridor, its clinical features, diagnosis and management.

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Schumacker, P. T., J. I. Sznajder, A. Nahum, and L. D. Wood. "Ventilation-perfusion inequality during constant-flow ventilation." Journal of Applied Physiology 62, no. 3 (1987): 1255–63. http://dx.doi.org/10.1152/jappl.1987.62.3.1255.

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Previous work by Lehnert et al. (J. Appl. Physiol. 53:483–489, 1982) has demonstrated that adequate alveolar ventilation can be maintained during apnea in anesthetized dogs by delivering a continuous stream of inspired ventilation through cannulas aimed down the main-stem bronchi. Because an asymmetric distribution of ventilation might introduce ventilation-perfusion (VA/Q) inequality, we compared gas exchange efficiency in nine anesthetized and paralyzed dogs during constant-flow ventilation (CFV) and conventional ventilation (intermittent positive-pressure ventilation, IPPV). Gas exchange wa

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James, Joanna L., Lawrence W. Chamley, and Alys R. Clark. "Feeding Your Baby In Utero: How the Uteroplacental Circulation Impacts Pregnancy." Physiology 32, no. 3 (2017): 234–45. http://dx.doi.org/10.1152/physiol.00033.2016.

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The utero-placental circulation links the maternal and fetal circulations during pregnancy, ensuring adequate gas and nutrient exchange, and consequently fetal growth. However, our understanding of this circulatory system remains incomplete. Here, we discuss how the utero-placental circulation is established, how it changes dynamically during pregnancy, and how this may impact on pregnancy success, highlighting how we may address knowledge gaps through advances in imaging and computational modeling approaches.

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Fliss, Jordan D., Brandon Zanette, Yonni Friedlander, et al. "Hyperpolarized 129Xe magnetic resonance spectroscopy in a rat model of bronchopulmonary dysplasia." American Journal of Physiology-Lung Cellular and Molecular Physiology 321, no. 3 (2021): L507—L517. http://dx.doi.org/10.1152/ajplung.00612.2020.

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Premature infants often require mechanical ventilation and oxygen therapy, which can result in bronchopulmonary dysplasia (BPD), characterized by developmental arrest and impaired lung function. Conventional clinical methods for assessing the prenatal lung are not adequate for the detection and assessment of long-term health risks in infants with BPD, highlighting the need for a noninvasive tool for the characterization of lung microstructure and function. Theoretical diffusion models, like the model of xenon exchange (MOXE), interrogate alveolar gas exchange by predicting the uptake of inert

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Yang, Jingang, Yaohua Zhao, Aoxue Chen, and Zhenhua Quan. "Thermal Performance of a Low-Temperature Heat Exchanger Using a Micro Heat Pipe Array." Energies 12, no. 4 (2019): 675. http://dx.doi.org/10.3390/en12040675.

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Domestic heat exchangers, even though widely used in industry, are not adequate for studies on low-temperature flue-gas use technologies. Despite spite their limitations, very few theoretical models have been investigated based on practical applications. Moreover, most of the existing studies on heat exchangers have focused particularly on one-dimensional and two-dimensional heat transfer models, while limited studies focus on three-dimensional ones. Therefore, this study aims at investigating the thermal performance of a low-temperature flue-gas heat recovery unit in the cold regions. Specifi

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27

Lorenzo-Minguez, P., R. Ceulemans, R. Gabriels, I. Impens, and O. Verdonck. "Response of Gas Exchange Behavior of Schefflera arboricola to Air Humidity and Temperature." HortScience 20, no. 6 (1985): 1060–62. http://dx.doi.org/10.21273/hortsci.20.6.1060.

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Abstract The effects of air temperature and leaf-to-air vapor pressure deficit (VPD) on the gas exchange behavior, i.e., net CO2 exchange rate (NCER) and dark respiration rate, transpiration, leaf diffusive conductance to water vapor, water use efficiency (WUE), and xylem pressure potential of Schefflera arboricola Hayata ‘Compacta’ were examined under conditions of adequate substrate moisture in a controlled environment growth chamber. The optimum temperature for NCER was around 25°C at a photo-synthetic photon flux density (PPFD) of 450 μmol s-1m-2 and an ambient CO2-concentration of about 3

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Ingenito, E., R. D. Kamm, J. W. Watson, and A. S. Slutsky. "A model of constant-flow ventilation in a dog lung." Journal of Applied Physiology 64, no. 5 (1988): 2150–59. http://dx.doi.org/10.1152/jappl.1988.64.5.2150.

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A semiempirical model of constant-flow ventilation (CFV) is developed to test the hypothesis that a three-zone serial model with the following characteristics can explain the adequate CO2 transport observed during CFV: 1) a zone of jet recirculation immediately downstream of the catheter in which convection dominates; 2) a zone influenced by turbulence but with little or no bulk flow; and 3) a peripheral zone, free of turbulence, in which transport is governed by molecular and augmented diffusion. Interactions between turbulent eddies and cardiogenic oscillations are included using a modificat

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Webster, P., A. S. Menon, and A. S. Slutsky. "Constant-flow ventilation in pigs." Journal of Applied Physiology 61, no. 6 (1986): 2238–42. http://dx.doi.org/10.1152/jappl.1986.61.6.2238.

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Constant-flow ventilation (CFV) is a ventilatory technique in which physiological blood gases can be maintained in dogs by a constant flow of fresh gas introduced via two catheters placed in the main-stem bronchi (J. Appl. Physiol. 53: 483–489, 1982). High-velocity gas exiting from the catheters can create uneven pressure differences in adjacent lung segments, and these pressure differences could lead to gas flow through collateral channels. To examine this hypothesis, we studied CFV in pigs, animals known to have a high resistance to collateral ventilation. In three pigs we examined steady-st

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30

Silva, Cláudio Ricardo da, Marcos Vinícius Folegatti, Tonny José Araújo da Silva, José Alves Júnior, Claudinei Fonseca Souza, and Rafael Vasconcelos Ribeiro. "Water relations and photosynthesis as criteria for adequate irrigation management in 'Tahiti' lime trees." Scientia Agricola 62, no. 5 (2005): 415–22. http://dx.doi.org/10.1590/s0103-90162005000500001.

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Irrigation scheduling based on soil moisture status is one of the most useful methods because of its practicality and low cost. The effects of available soil water depletion on evapotranspiration (ETc), transpiration (E), leaf water potential at predawn (psiP) and midday (psiM), stomatal conductance (gs) and net CO2 assimilation (A) in lime 'Tahiti' trees (Citrus latifolia) were evaluated to improve irrigation schedule and minimize water use without causing water stress. The trees were spaced 7 <FONT FACE=Symbol>´</FONT> 4 m and drip-irrigated by four drippers with the available so

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Montague, Thayne, and Lindsey Fox. "GAS EXCHANGE AND GROWTH OF TWO FIELD-GROWN MAPLE TREE SPECIES IN RESPONSE TO THREE REFERENCE EVAPOTRANSPIRATION BASED IRRIGATION REGIMES." HortScience 40, no. 3 (2005): 879d—879. http://dx.doi.org/10.21273/hortsci.40.3.879d.

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Recent droughts and depleted water tables across many regions have elevated the necessity to irrigate field-grown (FG) nursery trees. At the same time, ordinances restricting nursery irrigation volume (often without regard to plant water requirements) have been implemented. This research investigated gas exchange and growth of two FG maple tree species (Acer × freemanii `Autumn Blaze' and A. truncatum) subjected to three reference evapotranspiration (ETo) irrigation regimes (100%, 60%, and 30% of ETo) in a semi-arid climate. During Spring 2002, nine containerized (11.3 L) trees of each species

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Goldsmith, S. J., M. A. Thomas, and C. Gries. "A New Technique for Photobiont Culturing and Manipulation." Lichenologist 29, no. 6 (1997): 559–69. http://dx.doi.org/10.1006/lich.1997.0108.

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AbstractComparisons of whole-lichen physiology to the respective photobionts have often been unclear due to inherent differences in isolated photobiont culturing techniques. The use of 13-mm-diameter cellulose-acetate discs allows photobiont cultures access to nutrient agar medium, while improving ease of manipulation and distinct separation from the agar. Adequate culture growth for experimentation is reached in approximately three weeks, a time comparable to standard nutrient agar and liquid cultures. These discs are then available for use in a variety of manipulative techniques. Chlorophyll

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Evans, K. L., M. H. Keene, and A. S. E. Bristow. "High-frequency jet ventilation – a review of its role in laryngology." Journal of Laryngology & Otology 108, no. 1 (1994): 23–25. http://dx.doi.org/10.1017/s0022215100125733.

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High-frequency jet ventilation (HFJV) is a safe, effective anaesthetic technique with a low risk of aspiration which has not yet gained wide acceptance in laryngology. Following anaesthesia and muscular relaxation the patient is intubated with a size 7FG infant feeding catheter and ventilation is achieved by delivering small bursts of anaesthetic gas at high frequency. The mechanisms of gas exchange are thought to be little different from those of conventional ventilation. We have found HFJV to be of value in laryngoscopy, laryngo-tracheal reconstruction, tracheoplasty, bronchoscopy and tonsil

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Zribi, Ons Talbi, Kamel Hessini, Najla Trabelsi, et al. "Aeluropus littoralis maintains adequate gas exchange, pigment composition and phenolic contents under combined effects of salinity and phosphorus deficiency." Australian Journal of Botany 65, no. 5 (2017): 453. http://dx.doi.org/10.1071/bt17089.

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Salinity and phosphorus (P) deficiency are important environmental factors that decrease plant growth and productivity throughout the world. These two stresses frequently coexist in calcareous salt-affected soils. To better understand how plants adapt to these combined stresses, we investigated the interactive effects of salinity and P availability on photosynthetic activity, leaf pigment, phenolic compounds content and antioxidant activity in Aeluropus littoralis (Gouan)Parl., a promising C4 monocotyledonous halophyte that usually grows in dry salty areas or marshes. Plants were grown hydropo

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Kłos, Ryszard. "Modelling of Diving Apparatus Breathing Loop Ventilation." Solid State Phenomena 210 (October 2013): 97–107. http://dx.doi.org/10.4028/www.scientific.net/ssp.210.97.

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The article is based on hypothesis that it is possible to establish the adequate joined mathematical model for ventilation of breathing space (for assessing of artificial breathing mixture real composition) and human decompression after breathing artificial hyperbaric atmosphere. In the effect of establishing mathematical model give the chance to understand gas exchange in human body exposed to pressure. It makes possible to plane extreme hyperbaric expositions (e.g. military special operations) and stimulates progress in the field of anaesthesiology. There is presented scientific project prop

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Pan, Chih-Hsi, Chung-Kan Peng, Chen-Liang Tsai, and Chih-Hao Shen. "Weaning from Venovenous Mode Extracorporeal Membrane Oxygenation in Coronavirus Disease 2019-Related Respiratory Distress Syndrome." Journal of Medical Sciences 44, no. 1 (2023): 42–46. http://dx.doi.org/10.4103/jmedsci.jmedsci_53_23.

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The coronavirus disease-2019 (COVID-19) has caused a worldwide pandemic. Approximately 5% of victims develop severe acute respiratory distress syndrome (ARDS), and some require extracorporeal membrane oxygenation (ECMO). However, weaning patients with COVID-19-related ARDS from ECMO are challenging. Here, we report a COVID-19 case with severe ARDS that received venovenous ECMO to maintain adequate gas exchange for more than 4 weeks. We performed prolonged prone position ventilation and airway pressure release ventilation, and the patient was successfully weaned off ECMO.

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Brandolese, R., C. Broseghini, G. Polese, et al. "Effects of intrinsic PEEP on pulmonary gas exchange in mechanically-ventilated patients." European Respiratory Journal 6, no. 3 (1993): 358–63. http://dx.doi.org/10.1183/09031936.93.06030358.

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The aim of the study was to assess the impact of the intrinsic positive end-expiratory pressure (PEEPi) on pulmonary gas exchange in mechanically-ventilated patients, by comparing the effects of similar levels (0.8-0.9 kPa) of positive end-expiratory pressure (PEEP) and PEEPi. Ten patients with acute respiratory failure, without chronic airway disease, were studied with three ventilatory modes: 1) intermittent positive pressure ventilation with zero end-expiratory pressure (ZEEP mode); 2) continuous positive pressure ventilation with PEEP set by the ventilator (PEEP mode); and 3) intrinsic PEE

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Hou, Jingwei, Jiamao Li, Chengjian Xiao, Heyi Wang, and Shuming Peng. "Hydrogen–Water Isotope Catalytic Exchange Process Analysis by Simulation." Separations 11, no. 7 (2024): 219. http://dx.doi.org/10.3390/separations11070219.

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The hydrogen–water isotope catalytic exchange process has been widely applied in the tritium-containing water treatment process. It can be compared and analyzed conveniently with process simulation software. In this study, the catalytic exchange process was simulated by Aspen Plus software (V11). According to the simulation results, the main reaction process was that HDO in the liquid phase converts into HD in the gas phase, and the reaction mainly occurred at the bottom of the column, exhibiting a two-orders-of-magnitude-higher reaction amount compared to that observed in the top section. Dif

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Massaro, G. D., and D. Massaro. "Postnatal treatment with retinoic acid increases the number of pulmonary alveoli in rats." American Journal of Physiology-Lung Cellular and Molecular Physiology 270, no. 2 (1996): L305—L310. http://dx.doi.org/10.1152/ajplung.1996.270.2.l305.

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Dexamethasone, a glucocorticosteroid hormone, inhibits the formation of alveoli; retinoids and glucocorticosteroid hormones can be mutually antagonistic. These observations led us to test the hypothesis that the administration of retinoic acid to postnatal rats would prevent the low alveolar number and the low body mass-specific gas-exchange surface area (Sa) produced by treatment with dexamethasone. We used serial lung sections to distinguish alveoli from alveolar ducts and stereological procedures that allow quantitation of alveoli uninfluenced by their size, shape, or distribution. Treatmen

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Stoyanovskaya, Olga P., Vitaliy V. Grigoryev, Anastasiya N. Suslenkova, Maxim N. Davydov, and Nikolay V. Snytnikov. "Two-Phase Gas and Dust Free Expansion: Three-Dimensional Benchmark Problem for CFD Codes." Fluids 7, no. 2 (2022): 51. http://dx.doi.org/10.3390/fluids7020051.

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In the computational mechanics of multiphase dispersed flows, there is an issue of computing the interaction between phases in a mixture of a carrier fluid and dispersed inclusions. The problem is that an accurate dynamics simulation of a mixture of gas and finely dispersed solids with intense interphase interaction requires much more computational power compared to pure gas or a mixture with moderate interaction between phases. To tackle this problem, effective numerical methods are being searched for to ensure adequate computational cost, accuracy, and stability of the results at an arbitrar

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Massie, Darrell D., Daisie D. Boettner, and Cheryl A. Massie. "Residential Experience with Proton Exchange Membrane Fuel Cell Systems for Combined Heat and Power." Journal of Fuel Cell Science and Technology 2, no. 4 (2005): 263–67. http://dx.doi.org/10.1115/1.2041668.

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As part of a one-year Department of Defense demonstration project, proton exchange membrane fuel cell systems have been installed at three residences to provide electrical power and waste heat for domestic hot water and space heating. The 5kW capacity fuel cells operate on reformed natural gas. These systems operate at preset levels providing power to the residence and to the utility grid. During grid outages, the residential power source is disconnected from the grid and the fuel cell system operates in standby mode to provide power to critical loads in the residence. This paper describes les

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Suthers, Roderick A. "Vocal mechanisms in birds and bats: a comparative view." Anais da Academia Brasileira de Ciências 76, no. 2 (2004): 247–52. http://dx.doi.org/10.1590/s0001-37652004000200009.

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Vocal signals play a very important role in the life of both birds and echolocating bats, but these two unrelated groups of flying vertebrates have very different vocal systems. They nevertheless must solve many of the same problems in producing sound. This brief review examines avian and microchiropteran motor mechanisms for: 1) coordinating the timing of phonation with the vocal motor pattern that controls its acoustic properties, and 2) achieving respiratory strategies that provide adequate ventilation for pulmonary gas exchange, while also facilitating longer duration songs or trains of so

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Lorenzoni, Marcelo Zolin, Roberto Rezende, Álvaro Henrique Cândido de Souza, Fernando André Silva Santos, Cláudia Salim Lozano, and Cássio De Castro Seron. "Gas exchange, leaf and root dry mass in Bell Pepper under fertigation with nitrogen and potassium." Semina: Ciências Agrárias 39, no. 2 (2018): 511. http://dx.doi.org/10.5433/1679-0359.2018v39n2p511.

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Bell pepper is a vegetable-fruit of great economic importance in Brazil. Crop production demands adequate water supply, nutrients, and light. The objective of this study was to evaluate gas exchange (net photosynthesis, stomatal conductance, transpiration, internal carbon concentration and instantaneous carboxylation efficiency) and dry mass accumulation in leaves and roots under fertigation with nitrogen and potassium. The experiment was conducted in a completely randomized design in a factorial scheme (4 × 4) with four replications and a total of 64 experimental units. Treatments consisted o

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Mukhin, Victor A., and Daria K. Diyarova. "Eco-Physiological Adaptations of the Xylotrophic Basidiomycetes Fungi to CO2 and O2 Mode in the Woody Habitat." Journal of Fungi 8, no. 12 (2022): 1296. http://dx.doi.org/10.3390/jof8121296.

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The aim of this research is to study of eco-physiological adaptations of xylotrophic fungi (Basidiomycota, Agaricomycetes) to hypoxia, anoxia and hypercapnia as the main environmental factors that determine the activity of fungi in woody habitat. The study was carried out on seven species of polypore fungi widespread in the preforest-steppe pine-birch forests of the Central Urals, including both white (D. tricolor, D. septentrionalis, F. fomentarius, H. rutilans, T. biforme) and brown (F. betulina, F. pinicola) rot. Their CO2 and O2 gas exchange were analyzed in natural samples of woody substr

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International, Journal of Medical Science and Innovative Research (IJMSIR). "A Comparative Study To Assess The Knowledge Among Final Year B. Se Nursing and Final Year G.N.M Students on Care of Chest Tube Drainage in Selected Institutions at Bangalore." International Journal of Medical Science and Innovative Research (IJMSIR) 9, no. 4 (2024): 118–33. https://doi.org/10.5281/zenodo.15423194.

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<strong>Abstract</strong> <strong>Introduction and Objectives: </strong>Ventilation is the flow of gas in and out of the lungs. Adequate gas exchange depends on a effective ventilation. The normal breathing mechanism operates on the principle of negative pressure; that is, the pressure in the chest cavity normally is lower than the pressure of the atmosphere, causing air to move into the lung. The collection of air, fluid, or other substances in the chest can compromise cardiopulmonary function and can also cause the lung to collapse. Pathologic substances that collect in the pleural space inc

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Lizana, Rony Riveros, Rosiane de Souza Camargos, Raully Lucas Silva, Bruno Balbino Leme, and Nilva Kazue Sakomura. "Description and Validation of Flow-Through Chambers of Respirometry for Measuring Gas Exchange in Animal Trials." Animals 13, no. 16 (2023): 2675. http://dx.doi.org/10.3390/ani13162675.

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Indirect calorimetry (IC) is a widely used method to study animal energy metabolism by measuring gas exchange. The accuracy of IC depends on detecting variations in signals reflecting the metabolic response, which can be challenging due to measurement noise and external factors. This study proposes a methodology to validate IC systems, including an easy-to-use spreadsheet for data computing, to verify accuracy and detect whole-system leaks. We conducted a recovery test using a simulation of CO2 dynamics in MS Excel and injecting a known CO2 concentration into four respirometry chambers. The th

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Pelley, William B., Donald D. Taylor, and Charles F. Butler. "The Use of a Hollow Fiber Membrane Oxygenator for Extended Extra-Corporeal Support." Journal of ExtraCorporeal Technology 20 (1988): 128–30. http://dx.doi.org/10.1051/ject/198820s128.

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There is a small percentage of patients, who having undergone cardiac surgery, are unable to be weaned from cardiopulmonary bypass. Some reports in the literature seem to indicate some success with extended extra-corporeal support. In an effort to reduce the amount of supplies needed and the resulting confusion of utilizing a completely different oxygenator, a hollow fiber membrane oxygenator was selected as the oxygenator of choice for an extended extra-corporeal support system. The hollow fiber membrane oxygenator for extended extra-corporeal support has been utilized on 5 patients in the pa

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McClure, BG, and JC Dornan. "Fetal lung maturation." Fetal and Maternal Medicine Review 1, no. 2 (1989): 223–34. http://dx.doi.org/10.1017/s096553950000019x.

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Efficient respiration in a baby relies on adequate anatomical development of the lungs, effective control of respiration, neuromuscular coordination and anatomical and biochemical maturation of the alveoli so that they are stable, thin-walled and in close proximity to the alveolar capillary bed. As well as maturation of lung function, there must also be a major change in pulmonary blood flow at birth to allow perfusion of the capillary bed with deoxygenated blood in order that effective gas exchange can take place. Successful initiation and sustaining of repiration after birth requires all of

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Pinheiro, Maria Eduarda Oliveira, Otávio Costa Acevedo, and Pablo Eli Soares de Oliveira. "Análise noturna dos mecanismos que controlam os gradientes de CO2 e H2O em uma região costeira." Ciência e Natura 42 (August 28, 2020): e22. http://dx.doi.org/10.5902/2179460x46923.

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Understanding the water and carbon exchange in the soil-atmosphere system and the mechanisms that control these exchanges are fundamental to have a real and adequate representation of the physical processes involved. Under stable night conditions, carbon transfer processes such as respiration and water transfer processes such as dew deposition are more difficult to study by the eddy covariance method. Thus, the aim of this study is to investigate the mechanisms that control the exchange of water and carbon dioxide near a thermal power plant and the ocean, through the gradients of concentration

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Tomarchio, Emilia, Francesca Momigliano, Lorenzo Giosa, Patrick Duncan Collins, Nicholas A. Barrett, and Luigi Camporota. "The intricate physiology of veno-venous extracorporeal membrane oxygenation: an overview for clinicians." Perfusion 39, no. 1_suppl (2024): 49S—65S. http://dx.doi.org/10.1177/02676591241238156.

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During veno-venous extracorporeal membrane oxygenation (V-V ECMO), blood is drained from the central venous circulation to be oxygenated and decarbonated by an artificial lung. It is then reinfused into the right heart and pulmonary circulation where further gas-exchange occurs. Each of these steps is characterized by a peculiar physiology that this manuscript analyses, with the aim of providing bedside tools for clinical care: we begin by describing the factors that affect the efficiency of blood drainage, such as patient and cannulae position, fluid status, cardiac output and ventilatory str

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