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Carbon dioxide removal

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https://www.readbyqxmd.com/read/27904081/development-of-a-novel-milling-system-using-supercritical-carbon-dioxide-for-improvement-of-dissolution-characteristics-of-water-poorly-soluble-drugs
#1
Jennifer Chia Wee Fern, Hideya Nakamura, Satoru Watano
The aim of this study is to develop a novel milling system using supercritical carbon dioxide (SC-CO2) for the improvement of dissolution characteristics of water-poorly soluble drugs. SC-CO2 possesses high potential in the application of nanotechnology, due to the attractive properties of SC-CO2 fluid such as cheap, inert and non-polluting. In addition, SC-CO2 has density comparable to a liquid, viscosity similar to a gas, and high diffusion capacity. Most of all, carbon dioxide exists as gas in room temperature and pressure, which enables the removal of fluid instantaneously...
2016: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/27903208/early-experience-of-a-new-extracorporeal-carbon-dioxide-removal-device-for-acute-hypercapnic-respiratory-failure
#2
Ravindranath Tiruvoipati, Hergen Buscher, James Winearls, Jeff Breeding, Debasish Ghosh, Shimonti Chaterjee, Gary Braun, Eldho Paul, John F Fraser, John Botha
BACKGROUND: Recent advances in the technology of extracorporeal respiratory assist systems have led to a renewed interest in extracorporeal carbon dioxide removal (ECCOR). The Hemolung is a new, low-flow, venovenous, minimally invasive, partial ECCOR device that has recently been introduced to clinical practice to aid in avoiding invasive ventilation or to facilitate lung-protective ventilation. OBJECTIVE: We report our early experience on use, efficacy and safety of the Hemolung in three Australian intensive care units...
December 2016: Critical Care and Resuscitation: Journal of the Australasian Academy of Critical Care Medicine
https://www.readbyqxmd.com/read/27898802/nutrient-cycling-in-grassed-roadside-ditches-and-lawns-in-a-suburban-watershed
#3
Lauren E McPhillips, Peter M Groffman, Rebecca L Schneider, M Todd Walter
Roadside ditches are ubiquitous in developed landscapes. They are designed to route water from roads for safety, with little consideration of water quality or biogeochemical implications in ditch design and minimal data on environmental impacts. We hypothesize that periodic saturation and nutrient influxes may make roadside ditches hotspots for nitrogen (N) removal via denitrification as well as biological production of the greenhouse gases (GHGs) nitrous oxide (NO), methane (CH), and carbon dioxide (CO). Research sites included 12 grassed ditches and adjacent lawns with varying fertilization in a suburban watershed in central New York, where lawns represented a reference with similar soils as ditches but differing hydrology...
November 2016: Journal of Environmental Quality
https://www.readbyqxmd.com/read/27896375/-extracorporeal-co2-removal-as-an-alternative-to-tracheotomy-in-a%C3%A2-patient-with-extubation-failure
#4
A Redel, M Ritzka, S Kraus, A Philipp, H-J Schlitt, B Graf, T Bein
We report a patient with chest trauma who was admitted to the ICU after surgery. As he fulfilled protocol-based criteria, he was extubated 7 days after admission. However, despite intermittent non-invasive ventilation, the patient had to be re-intubated on day 10 owing to progressive hypercapnia. We decided to support the patient with a mid-flow veno-venous extracorporeal carbon dioxide removal (ECCO2‑R) system instead of a tracheotomy. Sufficient CO2 removal was established with a blood flow of 1.5 l/min and the patient was successfully extubated within a few hours...
November 28, 2016: Der Anaesthesist
https://www.readbyqxmd.com/read/27889667/the-impact-of-a-pulmonary-recruitment-maneuver-to-reduce-post-laparoscopic-shoulder-pain-a-randomized-controlled-trial
#5
Kyoungho Ryu, Wonjun Choi, Jaegeum Shim, Taejong Song
OBJECTIVE: A pulmonary recruitment maneuver (PRM) can effectively reduce post-laparoscopic shoulder pain (PLSP). However, a high-pressure PRM may cause pulmonary barotrauma. This study aimed to evaluate the efficacy and safety of a PRM using two different maximum inspiratory pressures (40 and 60cmH2O) for reducing PLSP. STUDY DESIGN: Patients undergoing gynecologic laparoscopy were randomly allocated to a control group (n=30), a 40 cmH2O PRM group (n=30), and a 60 cmH2O PRM group (n=30)...
November 16, 2016: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/27881667/a-mechanistic-physicochemical-model-of-carbon-dioxide-transport-in-blood
#6
David Patrick O'Neill, Peter A Robbins
A number of mathematical models have been produced that, given the Pco2 and Po2 of blood, will calculate the total concentrations for CO2 and O2 in blood. However, all these models contain at least some empirical features, and thus do not represent all of the underlying physicochemical processes in an entirely mechanistic manner. The aim of this study was to develop a physicochemical model of CO2 carriage by the blood to determine whether our understanding of the physical chemistry of the major chemical components of blood together with their interactions is sufficiently strong to predict the physiological properties of CO2 carriage by whole blood...
November 23, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27852158/biodegradation-of-low-and-high-molecular-weight-hydrocarbons-in-petroleum-refinery-wastewater-by-a-thermophilic-bacterial-consortium
#7
Arulazhagan Pugazhendi, Hadeel Abbad Wazin, Huda Qari, Jalal Mohammad Al-Badry Basahi, Jean Jacques Godon, Jeyakumar Dhavamani
Clean-up of contaminated wastewater remains to be a major challenge in petroleum refinery. Here we describe the capacity of a bacterial consortium enriched from crude oil drilling site in Al-Khobar, Saudi Arabia, to utilize polycyclic aromatic hydrocarbons as sole carbon source at 60 ˚C. The consortium reduced low molecular weight (LMW; naphthalene, phenanthrene, fluorene and anthracene) and high molecular weight (HMW; pyrene, benzo(e)pyrene and benzo(k)fluoranthene) PAH loads of up to 1.5 g/L with removal efficiencies of 90% and 80% within 10 days...
November 17, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27847920/removal-of-foreign-bodies-embedded-in-the-urinary-bladder-wall-by-a-combination-of-laparoscopy-and-carbon-dioxide-cystoscopic-assistance-case-report-and-literature-review
#8
Chengyue Jin, Yu Fan, Qian Zhang, Yu Wang, Shiliang Wu, Jie Jin
PURPOSE: To report a case of combined laparoscopic and carbon dioxide partial cystectomy and foreign body removal and to review the existing literature on the topic. MATERIALS AND METHODS: A 43-year-old Asian woman was found to have an intrauterine device embedded in the bladder wall during evaluation for chronic pelvic pain and urinary tract infection. She underwent cystoscopic-laparoscopic partial cystectomy, with an uncomplicated postoperative course. She had normal renal function during the follow-up period...
November 2016: Investigative and Clinical Urology
https://www.readbyqxmd.com/read/27847813/jet-ventilation-during-rigid-bronchoscopy-in-adults-a-focused-review
#9
REVIEW
Laurie Putz, Alain Mayné, Anne-Sophie Dincq
The indications for rigid bronchoscopy for interventional pulmonology have increased and include stent placements and transbronchial cryobiopsy procedures. The shared airway between anesthesiologist and pulmonologist and the open airway system, requiring specific ventilation techniques such as jet ventilation, need a good understanding of the procedure to reduce potentially harmful complications. Appropriate adjustment of the ventilator settings including pause pressure and peak inspiratory pressure reduces the risk of barotrauma...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27847183/management-effects-on-greenhouse-gas-dynamics-in-fen-ditches
#10
Mike Peacock, Luke M Ridley, Chris D Evans, Vincent Gauci
Globally, large areas of peatland have been drained through the digging of ditches, generally to increase agricultural production. By lowering the water table it is often assumed that drainage reduces landscape-scale emissions of methane (CH4) into the atmosphere to negligible levels. However, drainage ditches themselves are known to be sources of CH4 and other greenhouse gases (GHGs), but emissions data are scarce, particularly for carbon dioxide (CO2) and nitrous oxide (N2O), and show high spatial and temporal variability...
November 12, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27842755/extracorporeal-gas-exchange-the-expanding-role-of-extracorporeal-support-in-respiratory-failure
#11
REVIEW
Nikunj Bhatt, Erik Osborn
The use of extracorporeal support is expanding quickly in adult respiratory failure. Extracorporeal gas exchange is an accepted rescue therapy for severe acute respiratory distress syndrome (ARDS) in select patients. Extracorporeal carbon dioxide removal is also being investigated as a preventative, preemptive, and management platform in patients with respiratory failure other than severe ARDS. The non-ARDS patient population is much larger, so the potential for rapid growth is high. This article hopes to inform decisions about the use of extracorporeal support by increasing understanding concerning the past and present practice of extracorporeal gas exchange...
December 2016: Clinics in Chest Medicine
https://www.readbyqxmd.com/read/27809243/a-cross-correlational-analysis-between-electroencephalographic-and-end-tidal-carbon-dioxide-signals-methodological-issues-in-the-presence-of-missing-data-and-real-data-results
#12
Maria Sole Morelli, Alberto Giannoni, Claudio Passino, Luigi Landini, Michele Emdin, Nicola Vanello
Electroencephalographic (EEG) irreducible artifacts are common and the removal of corrupted segments from the analysis may be required. The present study aims at exploring the effects of different EEG Missing Data Segment (MDS) distributions on cross-correlation analysis, involving EEG and physiological signals. The reliability of cross-correlation analysis both at single subject and at group level as a function of missing data statistics was evaluated using dedicated simulations. Moreover, a Bayesian-based approach for combining the single subject results at group level by considering each subject's reliability was introduced...
October 31, 2016: Sensors
https://www.readbyqxmd.com/read/27799777/high-frequency-oscillatory-ventilation-is-an-effective-treatment-for-severe-pediatric-acute-respiratory-distress-syndrome-with-refractory-hypoxemia
#13
Yu-Xiong Guo, Zhao-Ni Wang, Ya-Ting Li, Li Pan, Li-Fen Yang, Yan Hu, Yue-Yu Sun, Liang-Ming Cai, Zhuang-Gui Chen
BACKGROUND AND PURPOSE: Early or primary application of high-frequency oscillatory ventilation (HFOV) has been recently suggested not to offer benefit to patients with acute respiratory distress syndrome (ARDS). However, the rescue effects of HFOV on severe pediatric acute respiratory distress syndrome (PARDS) with hypoxemia refractory to conventional mechanical ventilation (CMV) remain unclear. This study aimed to determine whether severe PARDS children would benefit from HFOV when oxygenation deteriorated on CMV and to identify any potential risk factors related to mortality...
2016: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/27791477/synergistic-effect-of-the-presence-of-suspended-and-dissolved-matter-on-the-removal-of-cyanide-from-coking-wastewater-by-tio2-photocatalysis
#14
Noelia Pueyo, Natividad Miguel, Rosa Mosteo, José L Ovelleiro, María P Ormad
This study assesses the influence of the presence of suspended and dissolved matter on the efficiency of TiO2 photocatalysis for the removal of cyanide from coking wastewater. Photocatalytic processes were carried out at basic pH (pH 9) with titanium dioxide (1 g/L), artificial radiation (290-800 nm) and during different time periods (20-100 min). The first assays applied in aqueous solutions achieved promising results in terms of removing cyanide. The maximum cyanide removal obtained in coking wastewater was 89% after 80 min of irradiation in the presence of suspended and dissolved matter...
October 28, 2016: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/27769000/tailoring-porosity-in-carbon-spheres-for-fast-carbon-dioxide-adsorption
#15
Jowita Marszewska, Mietek Jaroniec
Highly-porous carbon spheres were prepared by modified Stöber method combined with silica templating and CO2 activation. Silica was delivered in the form of either colloids or tetraethyl orthosilicate and used to create porosity. Subsequently, CO2 activation was used to develop microporosity. CO2 activation was done either: (1) on carbon spheres, following silica etching or (2) on silica-carbon composites, before silica removal. Both methods delivered carbon materials with well-developed structures and, importantly, preserved spherical morphology...
October 15, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27767177/optimal-bioenergy-power-generation-for-climate-change-mitigation-with-or-without-carbon-sequestration
#16
Dominic Woolf, Johannes Lehmann, David R Lee
Restricting global warming below 2 °C to avoid catastrophic climate change will require atmospheric carbon dioxide removal (CDR). Current integrated assessment models (IAMs) and Intergovernmental Panel on Climate Change scenarios assume that CDR within the energy sector would be delivered using bioenergy with carbon capture and storage (BECCS). Although bioenergy-biochar systems (BEBCS) can also deliver CDR, they are not included in any IPCC scenario. Here we show that despite BECCS offering twice the carbon sequestration and bioenergy per unit biomass, BEBCS may allow earlier deployment of CDR at lower carbon prices when long-term improvements in soil fertility offset biochar production costs...
October 21, 2016: Nature Communications
https://www.readbyqxmd.com/read/27766689/a-new-member-of-the-graphene-family-graphene-acid
#17
Ondřej Jankovský, Michal Nováček, Jan Luxa, David Sedmidubský, Vlastimil Fila, Martin Pumera, Zdeněk Sofer
A new member of the family of graphene derivatives, namely, graphene acid with a composition close to C1 (COOH)1 , was prepared by oxidation of graphene oxide. The synthetic procedure is based on repeated oxidation of graphite with potassium permanganate in an acidic environment. The oxidation process was studied in detail after each step. The multiple oxidations led to oxidative removal of other oxygen functional groups formed in the first oxidation step. Detailed chemical analysis showed only a minor amount of other oxygen-containing functional groups such as hydroxyl and the dominant presence of carboxyl groups in a concentration of about 30 wt %...
November 21, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27757745/recovery-and-reuse-of-sludge-from-active-and-passive-treatment-of-mine-drainage-impacted-waters-a-review
#18
Tsiverihasina V Rakotonimaro, Carmen Mihaela Neculita, Bruno Bussière, Mostafa Benzaazoua, Gérald J Zagury
The treatment of mine drainage-impacted waters generates considerable amounts of sludge, which raises several concerns, such as storage and disposal, stability, and potential social and environmental impacts. To alleviate the storage and management costs, as well as to give the mine sludge a second life, recovery and reuse have recently become interesting options. In this review, different recovery and reuse options of sludge originating from active and passive treatment of mine drainage are identified and thoroughly discussed, based on available laboratory and field studies...
October 18, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27750089/three-dimensionally-porous-graphene-a-high-performance-adsorbent-for-removal-of-albumin-bonded-bilirubin
#19
Chun Fang Ma, Qiang Gao, Kai Sheng Xia, Zhi Yuan Huang, Bo Han, Cheng Gang Zhou
The development of bilirubin adsorbents with high adsorption efficiencies towards albumin-bonded bilirubin is still a considerable challenge. In this work, a three-dimensionally porous graphene (3D-pGR) has been fabricated through a simple carbon dioxide (CO2) activation of thermally exfoliated graphite oxide (EGO). Intriguingly, the resultant 3D-pGR material showed hierarchically micro-meso-macroporous structure, high specific surface area of up to 843m(2)g(-1), and large pore volume as high as 2.71cm(3)g(-1)...
October 11, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27739872/the-clinical-significance-of-collateral-ventilation
#20
Peter B Terry, Richard J Traystman
Oxygen delivery and carbon dioxide removal being critical to cell survival, mammals have developed collateral vascular and ventilation systems to ensure tissue viability. Collateral ventilation, defined as ventilation of alveoli via pathways that bypass normal airways, is present in humans and many other species. The presence of collateral ventilation can be beneficial in certain disease states, while its relative absence can predispose to other diseases. These well defined anatomical pathways contribute little to ventilation in normal humans, but modulate ventilation perfusion imbalance in a variety of diseases including obstructive diseases such as asthma and emphysema...
October 14, 2016: Annals of the American Thoracic Society
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