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https://www.readbyqxmd.com/read/27925442/organocatalytic-coupling-of-co2-with-a-propargylic-alcohol-a-comprehensive-study-of-the-reaction-mechanism-combining-in-situ-atr-ir-spectroscopy-and-dft-calculations
#1
Amélie Boyaval, Raphaël Mereau, Bruno Grignard, Christophe Detrembleur, Christine Jerome, Thierry Tassaing
The metal-free coupling of propargylic alcohols with carbon dioxide catalysed by guanidine derivatives was investigated in detail through the combination of online kinetic studies by in-situ ATR-IR spectroscopy and DFT calculations. Bicyclic guanidines, namely TBD and MTBD, are effective catalysts for the conversion of 2-methyl-3-butyn-2-ol to α-methylene cyclic carbonate and oxoalkyl acyclic carbonate under mild reaction conditions. The lower selectivity of TBD in comparison with MTBD towards the formation of α-methylene cyclic carbonate was elucidated from DFT calculations and is related to the bifunctional activity (base/H-bond donor) of TBD decreasing the Gibbs free energy of the reaction path for the formation of the acyclic carbonate...
December 7, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27925406/iodide-photocatalyzed-reduction-of-carbon-dioxide-to-formic-acid-with-thiols-and-hydrogen-sulfide
#2
Mateo Berton, Rossella Mello, María Elena González-Núñez
The photolysis of iodide anions promotes the reaction of carbon dioxide with hydrogen sulfide or thiols to quantitatively yield formic acid and sulfur or disulfides. The reaction proceeds in acetonitrile and aqueous solutions, at atmospheric pressure and room temperature by irradiation using a low-pressure mercury lamp. This transition-metal-free photocatalytic process for CO2 capture coupled with H2 S removal may have been relevant as a prebiotic carbon dioxide fixation.
December 7, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27924818/an-ultra-tunable-platform-for-molecular-engineering-of-high-performance-crystalline-porous-materials
#3
Quan-Guo Zhai, Xianhui Bu, Chengyu Mao, Xiang Zhao, Luke Daemen, Yongqiang Cheng, Anibal J Ramirez-Cuesta, Pingyun Feng
Metal-organic frameworks are a class of crystalline porous materials with potential applications in catalysis, gas separation and storage, and so on. Of great importance is the development of innovative synthetic strategies to optimize porosity, composition and functionality to target specific applications. Here we show a platform for the development of metal-organic materials and control of their gas sorption properties. This platform can accommodate a large variety of organic ligands and homo- or hetero-metallic clusters, which allows for extraordinary tunability in gas sorption properties...
December 7, 2016: Nature Communications
https://www.readbyqxmd.com/read/27924399/current-and-future-carbon-budget-at-takayama-site-japan-evaluated-by-a-regional-climate-model-and-a-process-based-terrestrial-ecosystem-model
#4
Masatoshi Kuribayashi, Nam-Jin Noh, Taku M Saitoh, Akihiko Ito, Yasutaka Wakazuki, Hiroyuki Muraoka
Accurate projection of carbon budget in forest ecosystems under future climate and atmospheric carbon dioxide (CO2) concentration is important to evaluate the function of terrestrial ecosystems, which serve as a major sink of atmospheric CO2. In this study, we examined the effects of spatial resolution of meteorological data on the accuracies of ecosystem model simulation for canopy phenology and carbon budget such as gross primary production (GPP), ecosystem respiration (ER), and net ecosystem production (NEP) of a deciduous forest in Japan...
December 6, 2016: International Journal of Biometeorology
https://www.readbyqxmd.com/read/27923984/short-term-effect-of-volume-recruitment-derecruitment-manoeuvre-on-chest-wall-motion-in-duchenne-muscular-dystrophy
#5
Henri Meric, Line Falaize, Didier Pradon, Matthieu Lacombe, Michel Petitjean, David Orlikowski, Hélène Prigent, Frédéric Lofaso
Because progressive respiratory muscle weakness leads to decreased chest-wall motion with eventual ribcage stiffening, the purpose was to compare vital capacity (VC) and contributions of chest-wall compartments before and after volume recruitment-derecruitment manoeuvres (VRDM) in Duchenne muscular dystrophy (DMD). We studied nine patients with DMD and VC lower than 30% of predicted. VRDM was performed using 15 insufflations-exsufflations of +30 to -30 cmH2O. VC and three-dimensional chest-wall motion were measured, as well as oxygen saturation, transcutaneous partial pressure of carbon dioxide and the rapid shallow breathing index (respiratory rate/tidal volume) before (baseline) and immediately and 1 hour after VRDM...
December 6, 2016: Chronic Respiratory Disease
https://www.readbyqxmd.com/read/27923974/acute-vascular-effects-of-carbonated-warm-water-lower-leg-immersion-in-healthy-young-adults
#6
Shigehiko Ogoh, Ryohei Nagaoka, Takamasa Mizuno, Shohei Kimura, Yasuhiro Shidahara, Tomomi Ishii, Michinari Kudoh, Erika Iwamoto
Endothelial dysfunction is associated with increased cardiovascular mortality and morbidity; however, this dysfunction may be ameliorated by several therapies. For example, it has been reported that heat-induced increases in blood flow and shear stress enhance endothelium-mediated vasodilator function. Under these backgrounds, we expect that carbon dioxide (CO2)-rich water-induced increase in skin blood flow improves endothelium-mediated vasodilation with less heat stress. To test our hypothesis, we measured flow-mediated dilation (FMD) before and after acute immersion of the lower legs and feet in mild warm (38°C) normal or CO2-rich tap water (1000 ppm) for 20 min in 12 subjects...
December 2016: Physiological Reports
https://www.readbyqxmd.com/read/27922536/traffic-related-air-pollution-and-attention-in-primary-school-children-short-term-association
#7
Jordi Sunyer, Elisabet Suades-González, Raquel García-Esteban, Ioar Rivas, Jesús Pujol, Mar Alvarez-Pedrerol, Joan Forns, Xavier Querol, Xavier Basagaña
BACKGROUND: Although air pollution's short-term effects are well understood to be marked and preventable, its acute neuropsychological effects have, to our knowledge, not yet been studied. We aim to examine the association between daily variation in traffic-related air pollution and attention. METHODS: We conducted a follow-up study from January 2012 to March 2013 in 2,687 school children from 265 classrooms in 39 schools in Barcelona (Catalonia, Spain). We assessed four domains of children's attention processes every 3 months over four repeated visits providing a total of 10,002 computerized tests on 177 different days using the child Attention Network test (ANT)...
November 29, 2016: Epidemiology
https://www.readbyqxmd.com/read/27922179/a-carbon-dioxide-stripping-model-for-mammalian-cell-culture-in-manufacturing-scale-bioreactors
#8
Zizhuo Xing, Amanda M Lewis, Michael C Borys, Zheng Jian Li
Control of carbon dioxide within the optimum range is important in mammalian bioprocesses at the manufacturing scale in order to ensure robust cell growth, high protein yields, and consistent quality attributes. The majority of bioprocess development work is done in laboratory bioreactors, in which carbon dioxide levels are more easily controlled. Some challenges in carbon dioxide control can present themselves when cell culture processes are scaled up, because carbon dioxide accumulation is a common feature due to longer gas-residence time of mammalian cell culture in large scale bioreactors...
December 6, 2016: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/27920046/resuscitation-of-infants-with-congenital-diaphragmatic-hernia
#9
Anthony O'Rourke-Potocki, Kamal Ali, Vadivelam Murthy, Anthony Milner, Anne Greenough
OBJECTIVE: To determine whether the respiratory response to resuscitation in infants with congenital diaphragmatic hernia (CDH) as measured by a respiratory function monitor differed between those who did and did not survive. DESIGN: Observational study. SETTING: Tertiary perinatal centre. PATIENTS: Thirty-eight infants born at 34 weeks of gestation or greater and diagnosed antenatally with a CDH. INTERVENTIONS: Expiratory tidal volume (VTe), peak inflation pressure (PIP) and end-tidal carbon dioxide level (ETCO2) were simultaneously recorded during resuscitation using a respiratory function monitor...
December 5, 2016: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/27919430/carbon-dioxide-insufflation-deflects-airborne-particles-from-an-open-surgical-wound-model
#10
P Kokhanenko, G Papotti, J E Cater, A C Lynch, J A van der Linden, C J T Spence
BACKGROUND: Surgical site infections remain a significant burden on healthcare systems and may benefit from new countermeasures. AIM: To assess the merits of open surgical wound CO2 insufflation via a gas diffuser to reduce airborne contamination, and to determine the distribution of CO2 in and over a wound. METHODS: An experimental approach with engineers and clinical researchers was employed to measure the gas flow pattern and motion of airborne particles in a model of an open surgical wound in a simulated theatre setting...
November 21, 2016: Journal of Hospital Infection
https://www.readbyqxmd.com/read/27918460/indoor-air-quality-in-the-metro-system-in-north-taiwan
#11
Ying-Yi Chen, Fung-Chang Sung, Mei-Lien Chen, I-Fang Mao, Chung-Yen Lu
Indoor air pollution is an increasing health concern, especially in enclosed environments such as underground subway stations because of increased global usage by urban populations. This study measured the indoor air quality of underground platforms at 10 metro stations of the Taipei Rapid Transit system (TRTS) in Taiwan, including humidity, temperature, carbon monoxide (CO), carbon dioxide (CO₂), formaldehyde (HCHO), total volatile organic compounds (TVOCs), ozone (O₃), airborne particulate matter (PM10 and PM2...
December 2, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27918023/reactive-convective-dissolution-in-a-porous-medium-the-storage-of-carbon-dioxide-in-saline-aquifers
#12
Parama Ghoshal, Min Chan Kim, Silvana S S Cardoso
We quantify the destabilising effect of a first-order chemical reaction on the fingering instability of a diffusive boundary layer in a porous medium. Using scaling, we show that the dynamics of such a reactive boundary layer is fully determined by two dimensionless groups: Da/Ra(2), which measures the timescale for convection compared to those for reaction and diffusion; and βC/βA, which reflects the density change induced by the product relative to that of the diffusing solute. Linear stability and numerical results for βC/βA in the range 0-10 and Da/Ra(2) in the range 0-0...
December 5, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27916076/-daytime-hypercapnia-in-patients-with-obstructive-sleep-apnea-hypopnea-syndrome-in-han-and-uygur-nationality
#13
Z M He, X L Jiang, Piliqing Da, Z Ye, J P Li, Q L Zhang, Y Chen, J Shi, M Li, F Han
Objective: To evaluate the incidence and factors related to daytime hypercapnia in Han and Uygur patients with obstructive sleep apnea hypopnea syndrome (OSAHS). Methods: There were 221 patients with OSAHS (include 179 Han patients and 42 Uygur patients) in Sleep Center of Department of Respiratory and Critical Care Medicine of Karamay Central Hospital from 2015, Jan to Dec. All the patients underwent polysomnography (PSG), nocturnal oximetry, daytime blood gas analysis, pulmonary function test and Mouth occlusion pressure (P0...
November 29, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/27914757/a-quick-reference-on-metabolic-alkalosis
#14
REVIEW
Daniel S Foy, Helio Autran de Morais
Metabolic alkalemia is characterized by an increase in bicarbonate concentration and base excess, an increase in pH, and a compensatory increase in carbon dioxide pressure. This article outlines indications for analysis, reference ranges, causes, and clinical signs of metabolic alkalosis. Algorithms for evaluation of patients with acid-base disorders and metabolic alkalosis are included.
December 1, 2016: Veterinary Clinics of North America. Small Animal Practice
https://www.readbyqxmd.com/read/27913414/distinct-anaerobic-bacterial-consumers-of-cellobiose-derived-carbon-in-boreal-fens-differing-in-ch4-vs-co2-production-ratio
#15
Heli Juottonen, Alexander Eiler, Christina Biasi, Eeva-Stiina Tuittila, Kim Yrjälä, Hannu Fritze
: Northern peatlands in general have high methane (CH4) emissions, but individual peatlands show considerable variation as CH4 sources. Particularly in nutrient poor peatlands, CH4 production can be low and exceeded by carbon dioxide (CO2) production from unresolved anaerobic processes. To clarify the role anaerobic bacterial degraders play in this variation, we compared consumers of cellobiose-derived carbon in two fens differing in nutrient status and the ratio of CH4 and CO2 produced...
December 2, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27912943/differences-in-energy-expenditure-during-high-speed-versus-standard-speed-yoga-a-randomized-sequence-crossover-trial
#16
Melanie Potiaumpai, Maria Carolina Massoni Martins, Roberto Rodriguez, Kiersten Mooney, Joseph F Signorile
OBJECTIVES: To compare energy expenditure and volume of oxygen consumption and carbon dioxide production during a high-speed yoga and a standard-speed yoga program. DESIGN: Randomized repeated measures controlled trial. SETTING: A laboratory of neuromuscular research and active aging. INTERVENTIONS: Sun-Salutation B was performed, for eight minutes, at a high speed versus and a standard-speed separately while oxygen consumption was recorded...
December 2016: Complementary Therapies in Medicine
https://www.readbyqxmd.com/read/27912113/titanium-dioxide-and-cadmium-sulfide-co-sensitized-graphitic-carbon-nitride-nanosheets-composite-photocatalysts-with-superior-performance-in-phenol-degradation-under-visible-light-irradiation
#17
Jinhua Yao, Huan Chen, Fang Jiang, Zhongyi Jiao, Mingchang Jin
In this work, TiO2-CdS-gCNNSs heterojunction photocatalysts were successfully synthesized. CdS was deposited on the surface of gCNNSs via electrostatic attraction; TiOC, TiOCO and TiON bonds were produced in TiO2-CdS-gCNNSs, strengthening the interaction between TiO2 and gCNNSs. The TiO2-CdS-gCNNSs photocatalyst showed excellent photocatalytic activity for phenol degradation under visible-light irradiation, which was higher than that of CdS-gCNNSs, CdS-TiO2 and TiO2-gCNNSs. The improved photocatalytic performance of TiO2-CdS-gCNNSs was ascribed to more adsorption sites, enhanced light harvesting ability and effective separation rate of electron-hole pairs...
November 15, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27910802/near-infrared-spectroscopy-evaluated-cerebral-oxygenation-during-anesthesia
#18
Henrik Sørensen
Likely, maintained organ and notably cerebral perfusion, secures rapid recovery following anesthesia. To secure cerebral blood flow (CBF) at least mean arterial pressure (MAP) and the arterial carbon dioxide tension (PaCO2) need to be considered. CBF is "autoregulated", i.e. stays more or less stable within a MAP of 50-150 mmHg, but the lower limit appears to depend on the central blood volume and/or cardiac output, illustrated by a decrease in CBF at a MAP of 80 mmHg with a compromised central blood volume, while CBF remains constant with a MAP < 40 mmHg, if the central blood volume is maintained...
December 2016: Danish Medical Journal
https://www.readbyqxmd.com/read/27910536/experimental-study-on-the-fluorescence-spectrum-in-the-near-ultraviolet-and-visible-regions-of-a-carbon-dioxide-gas-cerenkov-medium
#19
Xingyin Guan, Huasi Hu, Zhaohui Song, Hetong Han
We investigated the faint fluorescence spectrum of carbon dioxide in the near-ultraviolet and visible regions using an intense relativistic electron beam accelerator with an energy of 0.2-0.3 MeV. Monte Carlo simulations were carried out in advance to maximize the signal-to-noise ratio and a self-normalization pulse experimental layout was designed to overcome the shot-to-shot fluctuations in different pulses of the accelerator. Ultimately, the relative proportion sequences in the near-ultraviolet and visible regions of a carbon dioxide fluorescence spectrum were successfully obtained for the first time...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910197/a-stable-manganese-pincer-catalyst-for-the-selective-dehydrogenation-of-methanol
#20
María Andérez-Fernández, Lydia K Vogt, Steffen Fischer, Wei Zhou, Haijun Jiao, Marcel Garbe, Saravanakumar Elangovan, Kathrin Junge, Henrik Junge, Ralf Ludwig, Matthias Beller
For the first time, structurally defined manganese pincer complexes catalyze the dehydrogenation of aqueous methanol to hydrogen and carbon dioxide, which is a transformation of interest with regard to the implementation of a hydrogen and methanol economy. Excellent long-term stability was demonstrated for the Mn-PNPiPr catalyst, as a turnover of more than 20 000 was reached. In addition to methanol, other important hydrogen carriers were also successfully dehydrogenated.
December 2, 2016: Angewandte Chemie
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