PubMed Journals Articles About "Carbon Dioxide" RSS

01:29 EDT 25th March 2019 | BioPortfolio

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

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Showing "Carbon Dioxide" PubMed Articles 1–25 of 4,000+

Effects of L-Menthol and Carbon Dioxide on the Adenoma Detection Rate during Colonoscopy: L-Menthol and Carbon Dioxide on Colonoscopy.

We examined the efficacy of the combined use of L-menthol spraying (L-mentholS) as an antispasmodic agent and carbon dioxide insufflation (CO2I) on the adenoma detection rate (ADR) in a prospective, single-center trial with a 2 × 2 factorial design.

Does California's Low Carbon Fuel Standards reduce carbon dioxide emissions?

The Low Carbon Fuel Standards (LCFS) represents a new policy approach designed to reduce carbon dioxide emissions by applying standards to all stages of motor fuel production. We use the synthetic control and difference-in-differences econometric methods, and Lasso machine learning to analyze the effect of the LCFS on emissions in California's transportation sector. The three different techniques provide robust evidence that the LCFS reduced carbon dioxide emissions in California's transportation sector by ...

Identification of a unique VUV photoabsorption band of carbonic acid for its identification in radiation and thermally processed water-carbon dioxide ices.

Carbonic acid was synthesized within an ice containing water and carbon dioxide by irradiation of ~9 eV photons. Vacuum UltraViolet (VUV)/UltraViolet (UV) photoabsorption spectra of the irradiated ice revealed absorption features from carbon dioxide, ozone, water, carbon monoxide and oxygen in addition to a band peaking at ~200 nm which is identified to be characteristic of carbonic acid. After thermal processing of the irradiated ice leading to desorption of the lower volatile ices, a pure carbonic aci...

Selective electroreduction of carbon dioxide to methanol on copper selenide nanocatalysts.

Production of methanol from electrochemical reduction of carbon dioxide is very attractive. However, achieving high Faradaic efficiency with high current density using facile prepared catalysts remains to be a challenge. Herein we report that copper selenide nanocatalysts have outstanding performance for electrochemical reduction of carbon dioxide to methanol, and the current density can be as high as 41.5 mA cm with a Faradaic efficiency of 77.6% at a low overpotential of 285 mV. The copper and selen...

Peptide nanotube for carbon dioxide chemisorption with regeneration properties and water compatibility.

A solid peptide nanotube material based on the self-assembled heptapeptide Ac-KLVFFAL-NH2 (KL-7) was demonstrated to be capable of selective chemisorption of carbon dioxide. The selective adsorption resulted from the chemical reaction of carbon dioxide with the amino group exposed on the KL-7 nanotube surface, with this reaction shown using solid-state NMR to have formed carbamate. The KL-7 nanotube powder showed good regeneration properties and was effective in the presence of water.

Synthesis of ZnO nanowires with supercritical carbon dioxide and post heat treatment.

ZnO nanowires are used in applications such as gas sensors and solar cells. This work presents a novel synthesis route for ZnO nanowires using supercritical carbon dioxide and post heat treatment. The method used supercritical carbon dioxide and a precursor solution as reactants to form nanowires on a galvanized surface. After the supercritical carbon dioxide treatment, the substrate was heat treated. The surfaces were characterized with SEM, TEM, EDS, FTIR, XRD and optical spectroscopy. The FTIR results sh...

Fractional Carbon Dioxide Laser in Patients with Skin Phototypes III to VI and Facial Burn Sequelae: 1-Year Follow-Up.

Fractional carbon dioxide laser treatment in postburn scars is safe and effective, but high rates of hypochromia (35 percent) have been described in patients with skin phototypes V and VI after 2 months. The authors evaluated the efficacy and safety of fractional carbon dioxide laser treatment of burn scars in skin phototypes III to VI after 1 year, focusing on the incidence of hypochromia.

End-tidal Carbon Dioxide During Pediatric In-Hospital Cardiopulmonary Resuscitation.

Based on laboratory cardiopulmonary resuscitation (CPR) investigations and limited adult data, the American Heart Association Consensus Statement on CPR Quality recommends titrating CPR performance to achieve end-tidal carbon dioxide (ETCO2) >20 mmHg.

Reduction of carbon oxides by an acyclic silylene: reductive coupling of CO.

The reactions of a boryl-substituted acyclic silylene with carbon dioxide and monoxide are reported. The former proceeds via oxygen atom abstraction, generating CO (with rearrangement of the putative silanone product via silyl group transfer). The latter is characterized by reductive coupling of CO to give an ethynediolate fragment which inserts into the Si-B bond. The net conversion of carbon dioxide with two equivalents of silylene offers a route for three-electron reduction of CO2 to [C2O2]2-.

Selectively biorefining astaxanthin and triacylglycerol co-products from microalgae with supercritical carbon dioxide extraction.

Clustering behavior of supercritical carbon dioxide, triacylglycerides, and astaxanthin solutes were analyzed using Kamlet-Taft solvatochromic properties of dipolarity/polarizability, π, and hydrogen-bond acceptance, β. Both parameters were decreased for supercritical carbon dioxide with TAG at low densities and with astaxanthin at high densities. These results indicated supercritical carbon dioxide could selectively extract triacylglycerides at low densities followed by astaxanthin at higher densities fr...

Stereoselective Aromatic Ring Hydrogenation over Supported Rhodium Catalysts in Supercritical Carbon Dioxide Solvent.

The combination of supported rhodium metal catalysts and supercritical carbon dioxide solvent was effective for the stereoselective ring hydrogenations of aromatic compounds at low temperature. Higher solubility of hydrogen in supercritical carbon dioxide provides higher concentration of hydrogen on the rhodium surface, but lower that of the intermediate on rhodium surface, which suppresses the flipping of surface intermediate, leading to higher catalyst activities and cis selectivities to the corresponding...

Impact of Fractional Ablative Carbon Dioxide Laser on the Treatment of Rhinophyma.

Rhinophyma results in nasal deformity, which may lead to significant distress, embarrassment, social isolation, and low self-esteem. Fractional carbon dioxide (CO2) laser treatment is a simple, non-invasive and outpatient procedure with a low complication rate that has been useful in rhinophyma treatment.

Influencing factors of the carbon dioxide emissions in China's commercial department: A non-parametric additive regression model.

The commercial department plays a significant role in China's energy conservation and carbon dioxide emission mitigation. The study employs a panel data set during 2001-2015 and adopts a non-parametric additive regression model to analyse the drivers of commercial department's carbon dioxide emissions in China. Non-parametric additive regression model based on the provincial panel data is first applied to investigate the carbon dioxide emissions in China's commercial department. The consequences demonstrate...

The effects of partial amniotic carbon dioxide insufflation in an ovine model.

We aim to assess the effect of partial amniotic carbon dioxide insufflation (PACI) at increasing pressures on fetal acid-base, fetal-placental perfusion and fetal membrane morphology in an ovine model.

Interaction between carbon dioxide emissions and eutrophication in a drinking water reservoir: A three-dimensional ecological modeling approach.

We developed a three-dimensional model to study the dynamics of carbon dioxide (CO) emission from a subtropical drinking water reservoir. The quantitative effects of dissolved CO concentration on phytoplankton growth were coupled in an inorganic carbon module. Water quality monitoring was carried out to calibrate and validate the model. The simulated surface CO concentrations showed no significant difference between seasons (p > 0.05). Regarding the spatial distribution, high CO concentrations were obse...

Correction: Does California's Low Carbon Fuel Standards reduce carbon dioxide emissions?

[This corrects the article DOI: 10.1371/journal.pone.0203167.].

Does modernization affect carbon dioxide emissions? A panel data analysis.

Modernization refers to the general trend of developmental progress that occurs within human societies. We now know that global warming, a result of carbon dioxide emissions, severely threatens the sustainability of human society. It is therefore of significant theoretical and practical implications that the scientific community more thoroughly investigate the impacts of modernization on CO emissions. Surprisingly, only a limited number of studies have addressed this topic previously. As the world's largest...

Raman Spectroscopic Study of the Effect of Aqueous Salt Solutions on the Inhibition of Carbon Dioxide Gas Hydrates.

We present an experimental Raman study on the thermodynamic inhibition effect of different salts (NaCl, KCl, MgCl and CaCl from 2.5 - 11 wt-%) on the formation of carbon dioxide gas hydrates. We performed the experiments in a high pressure vessel with two phases: A water-rich phase and a CO-rich phase. We investigated the changes the inhibitors induce in the water-rich phase before the onset of hydrate formation. This includes a study of the change in molar reaction enthalpy between strongly and weakly hydr...

Financial development, globalization, and CO emission in the presence of EKC: evidence from BRICS countries.

This study examines the impact of energy consumption, financial development, globalization, economic growth, and urbanization on carbon dioxide emissions in the presence of Environmental Kuznets Curve (EKC) model for BRICS economies, by using a family of econometric techniques robust to heterogeneity and cross-sectional dependence. Results from LM test, CIPS and CADF unit root test, Westerlund Cointegration test, the Dynamic seemingly unrelated regression (DSUR), and Dumitrescu-Hurlin Granger causality test...

The performance of 'temperature stick' carbon dioxide absorbent monitors in diving rebreathers.

Diving rebreathers use canisters containing soda lime to remove carbon dioxide (CO2) from expired gas. Soda lime has a finite ability to absorb CO₂. Temperature sticks monitor the exothermic reaction between CO₂ and soda lime to predict remaining absorptive capacity. The accuracy of these predictions was investigated in two rebreathers that utilise temperature sticks.

The ratios of central venous to arterial carbon dioxide content and tension to arteriovenous oxygen content are not associated with overall anaerobic metabolism in postoperative cardiac surgery patients.

The aim of the present study was to evaluate the ability of the ratios of central venous to arterial carbon dioxide content and tension to arteriovenous oxygen content to predict an increase in oxygen consumption (VO2) upon fluid challenge (FC).

Partial pressure of arterial carbon dioxide after resuscitation from cardiac arrest and neurological outcome: A prospective multi-center protocol-directed cohort study.

Partial pressure of arterial carbon dioxide (PaCO) is a regulator of cerebral blood flow after brain injury. We sought to test the association between PaCO after resuscitation from cardiac arrest and neurological outcome.

Fluidized granular activated carbon electrode for efficient microbial electrosynthesis of acetate from carbon dioxide.

The electricity-driven bioreduction of carbon dioxide to multi-carbon organic compounds, particularly acetate, has been achieved in microbial electrosynthesis (MES). MES performance can be limited by the amount of cathode surface area available for biofilm formation and slow substrate mass transfer. Here, a fluidized three-dimensional electrode, containing granular activated carbon (GAC) particles, was constructed via MES. The volumetric acetate production rate increased by 2.8 times through MES with 16 g...

Carbon dioxide CT angiography during endovascular treatment of bilateral common iliac disease with angio-CT utilisation.

This paper presents the application of carbon dioxide for CT imaging during an endovascular procedure to help characterise unexpected bilateral common iliac artery stenosis utilising an angio-CT system, confirming its application in interventional radiology while maintaining sterility. A 78 year old male was referred to the Radiology Interventional Suite with left lower limb rest pain. On imaging via digital subtraction angiography and CT utilising both iodinated contrast and carbon-dioxide (CO ), endovasc...

Revisiting the economic growth and electricity consumption nexus in Pakistan.

This paper revisits the interaction between electricity consumption, real gross domestic product, and carbon dioxide emissions in Pakistan. To this end, our study relies on annual data from 1971 to 2014 for the econometric analysis while accounting for structural break(s). According to the Maki cointegration test, a cointegration equilibrium relationship exists among electricity consumption, economic growth, and carbon dioxide emissions. The empirical findings from Toda-Yamamoto causality test provided the ...

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