PubMed Journals Articles About "Oxygen" RSS

13:46 EST 24th November 2017 | BioPortfolio

Oxygen PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Oxygen articles that have been published worldwide.

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Showing "Oxygen" PubMed Articles 1–25 of 3,800+

Pediatric Oxygen Therapy: A Clinical Update.

Oxygen therapy is a life-saving, medical intervention in the management of hospitalized children. The goal of oxygen therapy is to prevent or treat tissue hypoxia. Oxygen should be prescribed according to the principles of drug prescription, however, use of oxygen in clinical practice is often inappropriate without knowledge of its potential risks and benefits. This article summarizes practical aspects of clinical use of oxygen in terms of indication, administration, and monitoring, weaning, discontinuation...

Oxygen Availability and Nursing Capacity for Oxygen Therapy in Ugandan Paediatric Wards.

Oxygen is essential, life-saving, supportive treatment for children with hypoxaemia but is not available in many resource-constrained health facilities. We conducted a cross-sectional survey of oxygen availability and nurses' skills for oxygen administration at the paediatric wards of 11 district hospitals in eastern Uganda. Functional oxygen delivery was available at the paediatric wards of only 2 of 11 (18%) hospitals. Of the six concentrators found, two did not function at all and two produced a stream o...

Portable oxygen concentrators versus oxygen cylinder during walking in interstitial lung disease: A randomized crossover trial.

Ambulatory oxygen therapy is often provided to patients with interstitial lung disease (ILD). Lightweight portable oxygen concentrators (POCs) provide an alternative to traditional portable systems such as compressed oxygen cylinders; however, their efficacy in patients with ILD has not been assessed. This study aimed to evaluate the clinical performance of three ambulatory oxygen systems (two different POCs and a compressed oxygen cylinder) during 6-min walk tests (6MWTs) in patients with ILD and exertiona...

An Approach to Study the Interactions between Ellagitannins and Oxygen during Oak Wood Aging.

During the aging of red wine in oak wood barrels, or in alternative aging systems, interactions between the compounds released from wood, the compounds of the wine and oxygen can take place. The main objective of the present work was to study oxygen-ellagitannin interactions by monitoring their levels in three model systems all containing the same amounts of French oak chips and only differing in the oxygen content: total absence, only the oxygen released from the chips and air-saturated (model systems F, O...

Renal arteriovenous oxygen shunting.

Renal arteriovenous oxygen shunting has been proposed as a mechanism by which oxygen supplied to the kidney can bypass the renal parenchyma. Shunting could, therefore, play a crucial role in renal hypoxia and hyperoxia. In the absence of suitable quantitative experimental methods, computational modeling has been employed in recent years to estimate the extent and potential impact of oxygen shunting.

Reoxygenation With 100% Oxygen Following Hypoxia in Mice Causes Apoptosis.

After hypoxia, reoxygenation with air is the consensus treatment for full-term neonates; however, the effect of hyperoxic reoxygenation of adults is unknown. The present study was designed to investigate the effects of reoxygenation with 100% oxygen after hypoxia on inflammation and apoptosis in mice. Eight-week-old mice were either subjected to hypoxia in 8% oxygen for 30 min or air served as controls. Following hypoxia, mice underwent reoxygenation for 30 min with 21% or 100% oxygen. Tumour Necrosis F...

Hyperbaric oxygen in patients with ischemic stroke following cardiac surgery: a retrospective observational trial.

Hyperbaric oxygenation (HBO₂) involves breathing 100% oxygen under elevated ambient pressure in a hyperbaric chamber, thereby dissolving oxygen in the plasma. This results in an increase of arterial partial pressure of oxygen (pO₂). Though well established in experimental studies, HBO₂ treatment for ischemic stroke is still under discussion.

Corneal Equilibrium Flux as a Function of Corneal Surface Oxygen Tension.

Oxygen is essential for aerobic mammalian cell physiology. Oxygen tension (PO2) should reach a minimum at some position within the corneal stroma, and oxygen flux should be zero, by definition, at this point as well. We found the locations and magnitudes of this "corneal equilibrium flux" (xmin) and explored its physiological implications.

Critical Contact Lens Oxygen Transmissibility and Tear Lens Oxygen Tension to Preclude Corneal Neovascularization.

The purpose of this study is to determine the peripheral oxygen transmissibility (pDk/t) and respective central oxygen transmissibility (cDk/t) in soft contact lenses (SCLs) which might preclude SCL-driven corneal neovascularization (NV) in healthy myopic SCL users.

Acute Oxygen Therapy: An Audit of Prescribing and Delivery Practices in a Tertiary Hospital in Perth, Western Australia.

Oxygen is a widely used drug in the hospital setting. However, international audits suggest that oxygen administration practices are often not compliant with prescribed standards. This can place patients at risk and cause serious adverse events.

The effect of oxygen concentration and temperature on nitrogenase activity in the heterocystous cyanobacterium Fischerella sp.

Heterocysts are differentiated cells formed by some filamentous, diazotrophic (dinitrogen-fixing) cyanobacteria. The heterocyst is the site of dinitrogen fixation providing the oxygen-sensitive nitrogenase with a low-oxygen environment. The diffusion of air into the heterocyst is a compromise between the maximum influx of dinitrogen gas while oxygen is kept sufficiently low to allow nitrogenase activity. This investigation tested the hypothesis that the heterocyst is capable of controlling the influx of air...

Effect of localized hypoxia on Drosophila embryo development.

Environmental stress, such as oxygen deprivation, affects various cellular activities and developmental processes. In this study, we directly investigated Drosophila embryo development in vivo while cultured on a microfluidic device, which imposed an oxygen gradient on the developing embryos. The designed microfluidic device enabled both temporal and spatial control of the local oxygen gradient applied to the live embryos. Time-lapse live cell imaging was used to monitor the morphology and cellular migratio...

High oxygen facilitates wound-induced suberin polyphenolics formation in kiwifruit.

Rapid wound-healing would be critical for successful long-term storage of fruits and vegetables. However, there was no direct evidence for the requirement and efficiency of oxygen in fruit wound-healing process. This study was conducted to investigate the role of oxygen in wound-induced suberization by analyzing melanin, suberin polyphenolics (SPP) and related enzymes in half-cut kiwifruits exposed to 100%, 50%, 21% and 0% oxygen.

Novel multi-component photofunctional nanohybrids for ratio-dependent oxygen sensing.

In this paper, an anionic metal-organic framework Bio-MOF-1 (Zn8(ad)4(BPDC)6O·2Me2NH2) and a luminescent complex (Sm(3+) doped TiO2, labeled as Sm(3+)@TiO2) have both been prepared as previous reports and their photophysical properties are investigated. Subsequently, Tb(3+) is introduced to Bio-MOF-1 via cation exchange and the obtained Tb(3+)@Bio-MOF-1 can exhibit characteristic emission bands of Tb(3+). Exposed to varying concentration of oxygen, the luminescent intensity of Tb(3+) decreased as increasin...

Density functional theory study the effects of oxygen-containing functional groups on oxygen molecules and oxygen atoms adsorbed on carbonaceous materials.

Density functional theory was used to study the effects of different types of oxygen-containing functional groups on the adsorption of oxygen molecules and single active oxygen atoms on carbonaceous materials. During gasification or combustion reactions of carbonaceous materials, oxygen-containing functional groups such as hydroxyl(-OH), carbonyl(-CO), quinone(-O), and carboxyl(-COOH) are often present on the edge of graphite and can affect graphite's chemical properties. When oxygen-containing functional g...

Comparison of normobaric vs. hyperbaric oxygen in the relief of carbon monoxide headache pain.

Headache is the most common symptom in carbon monoxide (CO) poisoning. While the mechanism of CO-induced headache is not well defined, it is felt that cerebral vasodilation plays a role. Clinical experience has demonstrated oxygen breathing is effective in resolving CO headache. However, the effectiveness of normobaric oxygen has never been compared to hyperbaric oxygen in this regard.

Is Humidified Better than Non-humidified Low Flow Oxygen Therapy? A Systematic Review and Meta-Analysis.

To determine the effects of low-flow oxygen therapy with humidified or non-humidified oxygen in adult patients.

The Evolution of Structural and Electrical Properties of Oxygen-Deficient VO2 under Low Temperature Heating Process.

Structural stability and functional performances of Vanadium dioxide (VO2) are strongly influenced by oxygen vacancies. However, the mechanism of metal-insulator transition (MIT) influenced by defects is still under debate. Here, we study the evolution of structure and electrical property of oxygen-deficient VO2 by a low temperature annealing process (LTP) based on a truss-structured VO2 nanonet. The oxygenation process of the oxygen-deficient VO2 is greatly prolonged, which enable us to probe the gradual c...

Humidified High-Flow Nasal Cannula Oxygen-More Than Just Supplemental Oxygen.

Effect of different silage storing conditions on oxygen concentration in the silo and fermentation quality of rice.

We investigated the effects of different silage storing conditions on oxygen concentration in the silo and fermentation quality of rice (Oryza sativa L.). Forage rice was ensiled in bottles (with or without space at the bottlemouth; with solid or pinhole cap; and with oxygen scavenger, ethanol transpiration agent, oxygen scavenger and ethanol transpiration agent, or no adjuvant) and stored for 57 d. Oxygen concentration decreased with the addition of oxygen scavenger and increased with that of ethanol trans...

Enhanced Electrocatalytic Oxygen Reduction on NiWOx Solid solution with induced oxygen defects.

The continuous solid solution NiWOx is successfully prepared by using precursor W18O49 with plenty of oxygen defects. The NiWOx nanoparticles are characterized by X-ray diffraction, High resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The crystallographic phase of NiWOx is stable and characterized by the same feature of the parent lattice W18O49 even with various concentration of dopant Ni which indicates the existence of oxygen defects. The NiWOx nanop...

Pulse oximetry values of neonates admitted for care and receiving routine oxygen therapy at a resource-limited hospital in Kenya.

There are 2.7 million neonatal deaths annually, 75% of which occur in sub-Saharan Africa and South Asia. Effective treatment of hypoxaemia through tailored oxygen therapy could reduce neonatal mortality and prevent oxygen toxicity.

Oxygen-Promoted Methane Activation on Copper.

The role of oxygen in the activation of C-H bonds in methane on clean and oxygen pre-covered Cu(111) and Cu2O(111) surfaces was studied with combined in situ ambient pressure scanning tunneling microscopy and X-ray photoelectron spectroscopy. Activation of methane at 300 K and "moderate pressures" was only observed on oxygen pre-covered Cu(111) surfaces. Density functional theory calculations reveal that the lowest activation energy barrier of C-H on Cu(111) in the presence of chemisorbed oxygen is related ...

Elucidation of the Oxygen Surface Kinetics in a Coated Dual-Phase Membrane for Enhancing Oxygen Permeation Flux.

The dual-phase membrane has received much attention as the solution to the instability of the oxygen permeation membrane. It has been reported that the oxygen flux of the dual-phase membrane is greatly enhanced by the active coating layer. However, there has been little discussion about the enhancement mechanism by surface coating in the dual-phase membrane. This study investigates the oxygen flux of Ce0.9Gd0.1O2-δ-La0.7Sr0.3MnO3±δ (GDC 80 vol.%/LSM 20 vol.%) composite membrane depending on the oxygen pa...

Regime shifts and ecological catastrophes in a model of plankton-oxygen dynamics under the climate change.

It is estimated that more than a half of the total atmospheric oxygen is produced in the oceans due to the photosynthetic activity of phytoplankton. Any significant decrease in the net oxygen production by phytoplankton is therefore likely to result in the depletion of atmospheric oxygen and in a global mass mortality of animals and humans. In its turn, the rate of oxygen production is known to depend on water temperature and hence can be affected by the global warming. We address this problem theoretically...

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