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https://www.readbyqxmd.com/read/27911498/solvothermally-prepared-cu2o-electrocatalysts-for-co2-reduction-with-tunable-selectivity-by-the-introduction-of-p-block-elements
#1
Gastón O Larrazábal, Antonio J Martín, Frank Krumeich, Roland Hauert, Javier Pérez-Ramírez
The electroreduction of CO2 to fuels and chemicals is an attractive strategy for valorizing CO2 emissions. In this study, we show that a Cu2O electrocatalyst prepared by a simple and potentially scalable solvothermal route effectively targeted CO evolution at low to moderate overpotentials (CECO ca. 60% after 12 h at -0.6 V vs. RHE), and that the introduction of p-block elements (In, Sn, Ga, Al) into the catalyst can be employed to tune its selectivity. SEM, HRTEM, and voltammetric analyses revealed that the Cu2O catalyst undergoes extensive surface restructuring (favorable for CO evolution) under reaction conditions...
December 2, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27898193/modeling-long-term-changes-in-tundra-carbon-balance-following-wildfire-climate-change-and-potential-nutrient-addition
#2
Yueyang Jiang, Edward B Rastetter, Gaius R Shaver, Adrian V Rocha, Qianlai Zhuang, Bonnie L Kwiatkowski
To investigate the underlying mechanisms that control long-term recovery of tundra carbon (C) and nutrients after fire, we employed the Multiple Element Limitation (MEL) model to simulate 200-yr post-fire changes in the biogeochemistry of three sites along a burn severity gradient in response to increases in air temperature, CO2 concentration, nitrogen (N) deposition, and phosphorus (P) weathering rates. The simulations were conducted for severely burned, moderately burned, and unburned arctic tundra. Our simulations indicated that recovery of C balance after fire was mainly determined by the internal redistribution of nutrients among ecosystem components (controlled by air temperature), rather than the supply of nutrients from external sources (e...
August 4, 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/27898125/co2-reduction-over-nanbo3-and-natao3-perovskite-photocatalysts
#3
F Fresno, P Jana, P Reñones, J M Coronado, D P Serrano, V A de la Peña O'Shea
The activity of NaNbO3 and NaTaO3 perovskites for the photocatalytic reduction of CO2 is studied in this work. For this purpose, sodium niobate and tantalate have been prepared using solid-state reactions, extensively characterised by means of powder X-ray diffraction, UV-vis, photoluminescence and Raman spectroscopies and N2 adsorption isotherms, and tested in the gas-phase reduction of CO2 under UV light in a continuous flow photoreactor. NaNbO3 is constituted of an orthorhombically distorted perovskite structure, while a ca...
September 5, 2016: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/27856846/seasonal-exposure-of-carbon-dioxide-ice-on-the-nucleus-of-comet-67p-churyumov-gerasimenko
#4
G Filacchione, A Raponi, F Capaccioni, M Ciarniello, F Tosi, M T Capria, M C De Sanctis, A Migliorini, G Piccioni, P Cerroni, M A Barucci, S Fornasier, B Schmitt, E Quirico, S Erard, D Bockelee-Morvan, C Leyrat, G Arnold, V Mennella, E Ammannito, G Bellucci, J Benkhoff, J P Bibring, A Blanco, M I Blecka, R Carlson, U Carsenty, L Colangeli, M Combes, M Combi, J Crovisier, P Drossart, T Encrenaz, C Federico, U Fink, S Fonti, M Fulchignoni, W H Ip, P Irwin, R Jaumann, E Kuehrt, Y Langevin, G Magni, T McCord, L Moroz, S Mottola, E Palomba, U Schade, K Stephan, F Taylor, D Tiphene, G P Tozzi, P Beck, N Biver, L Bonal, J-Ph Combe, D Despan, E Flamini, M Formisano, A Frigeri, D Grassi, M S Gudipati, D Kappel, A Longobardo, F Mancarella, K Markus, F Merlin, R Orosei, G Rinaldi, M Cartacci, A Cicchetti, Y Hello, F Henry, S Jacquinod, J M Reess, R Noschese, R Politi, G Peter
Carbon dioxide is one of the most abundant species in cometary nuclei, but due to its high volatility CO2 ice is generally only found beneath the surface. We report the infrared spectroscopic identification of a CO2 ice-rich surface area, located in the Anhur region of comet 67P/Churyumov-Gerasimenko. Spectral modeling shows that about 0.1% of the 80×60 m area is CO2 ice. This exposed ice was observed a short time after exiting from local winter; following the increased illumination, the CO2 ice completely disappeared over about three weeks...
November 17, 2016: Science
https://www.readbyqxmd.com/read/27822555/novel-syntrophic-populations-dominate-an-ammonia-tolerant-methanogenic-microbiome
#5
J A Frank, M Ø Arntzen, L Sun, L H Hagen, A C McHardy, S J Horn, V G H Eijsink, A Schnürer, P B Pope
Biogas reactors operating with protein-rich substrates have high methane potential and industrial value; however, they are highly susceptible to process failure because of the accumulation of ammonia. High ammonia levels cause a decline in acetate-utilizing methanogens and instead promote the conversion of acetate via a two-step mechanism involving syntrophic acetate oxidation (SAO) to H2 and CO2, followed by hydrogenotrophic methanogenesis. Despite the key role of syntrophic acetate-oxidizing bacteria (SAOB), only a few culturable representatives have been characterized...
September 2016: MSystems
https://www.readbyqxmd.com/read/27821342/high-temperature-ultralow-water-content-carbon-dioxide-in-water-foam-stabilized-with-viscoelastic-zwitterionic-surfactants
#6
Shehab Alzobaidi, Chang Da, Vu Tran, Maša Prodanović, Keith P Johnston
Ultralow water content carbon dioxide-in-water (C/W) foams with gas phase volume fractions (ϕ) above 0.95 (that is <0.05 water) tend to be inherently unstable given that the large capillary pressures that cause the lamellar films to thin. Herein, we demonstrate that these C/W foams may be stabilized with viscoelastic aqueous phases formed with a single zwitterionic surfactant at a concentration of only 1% (w/v) in DI water and over a wide range of salinity. Moreover, they are stable with a foam quality ϕ up to 0...
October 20, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27817818/clinical-usefulness-of-end-tidal-co2-profiles-during-incremental-exercise-in-patients-with-chronic-thromboembolic-pulmonary-hypertension
#7
R P Ramos, E V M Ferreira, F M Valois, A Cepeda, C M S Messina, R K Oliveira, A T V Araújo, C A Teles, J A Neder, L E Nery, J S Ota-Arakaki
INTRODUCTION: Great ventilation to carbon dioxide output (ΔV˙E/ΔV˙CO2) and reduced end-tidal partial pressures for CO2 (PetCO2) during incremental exercise are hallmarks of chronic thromboembolic pulmonary hypertension (CTEPH) and idiopathic pulmonary arterial hypertension (IPAH). However, CTEPH is more likely to involve proximal arteries, which may lead to poorer right ventricle-pulmonary vascular coupling and worse gas exchange abnormalities. Therefore, abnormal PetCO2 profiles during exercise may be more prominent in patients with CTEPH and could be helpful to indicate disease severity...
November 2016: Respiratory Medicine
https://www.readbyqxmd.com/read/27803354/high-mid-flow-to-vital-capacity-ratio-and-the-response-to-exercise-in-children-with-congenital-heart-disease
#8
Daphna Vilozni, Maria Rosario Alcaneses-Ofek, Ronen Reuveny, Omer Rosenblum, Omri Inbar, Uriel Katz, Tomer Ziv-Baran, Gal Dubnov-Raz
BACKGROUND: Pulmonary mechanics may play a role in exercise intolerance in patients with congenital heart disease (CHD). A reduced FVC volume could increase the ratio between mid-flow (FEF25-75%) and FVC, which is termed high dysanapsis. The relationship between high dysanapsis and the response to maximum-intensity exercise in children with CHD had not yet been studied. The aim of this work was to examine whether high dysanapsis is related to the cardiopulmonary response to maximum-intensity exercise in pediatric subjects with CHD...
December 2016: Respiratory Care
https://www.readbyqxmd.com/read/27748214/electron-beam-induced-deposition-for-atom-probe-tomography-specimen-capping-layers
#9
David R Diercks, Brian P Gorman, Johannes J L Mulders
Six precursors were evaluated for use as in situ electron beam-induced deposition capping layers in the preparation of atom probe tomography specimens with a focus on near-surface features where some of the deposition is retained at the specimen apex. Specimens were prepared by deposition of each precursor onto silicon posts and shaped into sub-70-nm radii needles using a focused ion beam. The utility of the depositions was assessed using several criteria including composition and uniformity, evaporation behavior and evaporation fields, and depth of Ga+ ion penetration...
October 17, 2016: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/27744227/silicon-improves-rice-grain-yield-and-photosynthesis-specifically-when-supplied-during-the-reproductive-growth-stage
#10
Alyne O Lavinsky, Kelly C Detmann, Josimar V Reis, Rodrigo T Ávila, Matheus L Sanglard, Lucas F Pereira, Lílian M V P Sanglard, Fabrício A Rodrigues, Wagner L Araújo, Fábio M DaMatta
Silicon (Si) has been recognized as a beneficial element to improve rice (Oryza sativa L.) grain yield. Despite some evidence suggesting that this positive effect is observed when Si is supplied along the reproductive growth stage (from panicle initiation to heading), it remains unclear whether its supplementation during distinct growth phases can differentially impact physiological aspects of rice and its yield and the underlying mechanisms. Here, we investigated the effects of additions/removals of Si at different growth stages and their impacts on rice yield components, photosynthetic performance, and expression of genes (Lsi1, Lsi2 and Lsi6) involved in Si distribution within rice shoots...
October 5, 2016: Journal of Plant Physiology
https://www.readbyqxmd.com/read/27722342/contrasting-reactions-of-hydrated-electron-and-formate-radical-with-2-thio-analogues-of-cytosine-and-uracil
#11
Kavanal P Prasanthkumar, Juan R Alvarez-Idaboy, Pavitra V Kumar, Beena G Singh, K Indira Priyadarsini
2-Thiocytosine (TC) and 2-thiouracil (TU) were subjected to hydrated electron (eaq(-)), formate radical (CO2˙(-)) and 2-hydroxypropan-2-yl radical ((CH3)2˙COH) reactions in aqueous medium. Transients were characterized by absorption spectroscopy and the experimental findings were rationalized by DFT calculations at LC-ωPBE and M06-2X levels using a 6-311+G(d,p) basis set and SMD solvation. In eaq(-) reactions, a ring N-atom protonated radical of TC and an exocyclic O-atom protonated radical of TU were observed via addition of eaq(-) and subsequent protonation by solvent molecules...
October 10, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27704769/mechanically-tunable-readily-processable-ion-gels-by-self-assembly-of-block-copolymers-in-ionic-liquids
#12
Timothy P Lodge, Takeshi Ueki
Room temperature ionic liquids are of great interest for many advanced applications, due to the combination of attractive physical properties with essentially unlimited tunability of chemical structure. High chemical and thermal stability, favorable ionic conductivity, and complete nonvolatility are just some of the most important physical characteristics that make ionic liquids promising candidates for emerging technologies. Examples include separation membranes, actuators, polymer gel electrolytes, supercapacitors, ion batteries, fuel cell membranes, sensors, printable plastic electronics, and flexible displays...
October 5, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27688911/can-transcutaneous-co2-tension-be-used-to-calculate-ventilatory-dead-space-a-pilot-study
#13
Pradeep H Lakshminarayana, Adiba A Geeti, Umer M Darr, David A Kaufman
Dead space fraction (V d/V t) measurement performed using volumetric capnography requires arterial blood gas (ABG) sampling to estimate the partial pressure of carbon dioxide (PaCO2). In recent years, transcutaneous capnography (PtcCO2) has emerged as a noninvasive method of estimating PaCO2. We hypothesized that PtcCO2 can be used as a substitute for PaCO2 in the calculation of V d/V t. In this prospective pilot comparison study, 30 consecutive postcardiac surgery mechanically ventilated patients had V d/V t calculated separately using volumetric capnography by substituting PtcCO2 for PaCO2...
2016: Critical Care Research and Practice
https://www.readbyqxmd.com/read/27652119/air-quality-index-from-charcoal-production-sites-carboxyheamoglobin-and-lung-function-among-occupationally-exposed-charcoal-workers-in-south-western-nigeria
#14
O O Olujimi, G R E E Ana, O O Ogunseye, V T Fabunmi
Charcoal production is often accompanied with gaseous and particulate emission into the atmosphere and occupationally exposed workers could be affected. This cross sectional comparative study was carried out to assess the levels of carbon monoxide (CO), carbon dioxide (CO2), sulphur dioxide (SO2), nitrogen dioxide (NO2) and particulate matter (PM2.5) generated during the phases of charcoal production and their relationship with certain biomarkers among charcoal workers (subjects) and non-charcoal workers (controls) such as carboxyhaemoglobin (COHb), forced expiratory volume in the first second of expiration (FEV1), peak expiratory flow rate (PEFR) and body mass index (BMI) in Igbo-Ora, Oyo State and Alabata, Ogun State, which are two of the major hubs of charcoal production in South Western Nigeria...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27649964/lipids-rich-in-%C3%AF-3-polyunsaturated-fatty-acids-from-microalgae
#15
REVIEW
N F Santos-Sánchez, R Valadez-Blanco, B Hernández-Carlos, A Torres-Ariño, P C Guadarrama-Mendoza, R Salas-Coronado
Despite microalgae recently receiving enormous attention as a potential source of biodiesel, their use is still not feasible as an alternative to fossil fuels. Recently, interest in microalgae has focused on the production of bioactive compounds such as polyunsaturated fatty acids (PUFA), which provide microalgae a high added value. Several considerations need to be assessed for optimizing PUFA production from microalgae. Firstly, a microalgae species that produces high PUFA concentrations should be selected, such as Nannochloropsis gaditana, Isochrysis galbana, Phaeodactylum tricornutum, and Crypthecodinium cohnii, with marine species gaining more attention than do freshwater species...
October 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27634497/decoding-how-a-soil-bacterium-extracts-building-blocks-and-metabolic-energy-from-ligninolysis-provides-road-map-for-lignin-valorization
#16
Arul M Varman, Lian He, Rhiannon Follenfant, Weihua Wu, Sarah Wemmer, Steven A Wrobel, Yinjie J Tang, Seema Singh
Sphingobium sp. SYK-6 is a soil bacterium boasting a well-studied ligninolytic pathway and the potential for development into a microbial chassis for lignin valorization. An improved understanding of its metabolism will help researchers in the engineering of SYK-6 for the production of value-added chemicals through lignin valorization. We used (13)C-fingerprinting, (13)C metabolic flux analysis ((13)C-MFA), and RNA-sequencing differential expression analysis to uncover the following metabolic traits: (i) SYK-6 prefers alkaline conditions, making it an efficient host for the consolidated bioprocessing of lignin, and it also lacks the ability to metabolize sugars or organic acids; (ii) the CO2 release (i...
October 4, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27615115/quantifying-cerebrovascular-reactivity-in-anterior-and-posterior-cerebral-circulations-during-voluntary-breath-holding
#17
Christina D Bruce, Craig D Steinback, Uday V Chauhan, Jamie R Pfoh, Maria Abrosimova, Emily R Vanden Berg, Rachel J Skow, Margie H Davenport, Trevor A Day
What is the central question of this study? We developed and validated a 'stimulus index' (SI; ratio of end-tidal partial pressures of CO2 and O2 ) method to quantify cerebrovascular reactivity (CVR) in anterior and posterior cerebral circulations during breath holding. We aimed to determine whether the magnitude of CVR is correlated with breath-hold duration. What is the main finding and its importance? Using the SI method and transcranial Doppler ultrasound, we found that the magnitude of CVR of the anterior and posterior cerebral circulations is not positively correlated with physiological or psychological break-point during end-inspiratory breath holding...
December 1, 2016: Experimental Physiology
https://www.readbyqxmd.com/read/27614620/feasibility-of-attached-cultivation-for-polysaccharides-production-by-porphyridium-cruentum
#18
Giovanni Antonio Lutzu, Lanlan Zhang, Zhaohui Zhang, Tianzhong Liu
Porphyridium cruentum is one of the most valued microalgae species able to produce both pigments and exopolysaccharides. Conventional liquid suspended cultivation in ponds and photobioreactors show its disadvantages in lower cultivation efficiency and higher stirring power consumption due to the high viscosity of the medium by the accumulation of polysaccharides. In this work, a new method of culture (called attached cultivation) based on the growth of microalgae using a supporting surface was successfully applied to the cultivation of P...
September 10, 2016: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/27582736/micro-scale-h2-co2-dynamics-in-a-hydrogenotrophic-methanogenic-membrane-reactor
#19
Emilio Garcia-Robledo, Lars D M Ottosen, Niels V Voigt, M W Kofoed, Niels P Revsbech
Biogas production is a key factor in a sustainable energy supply. It is possible to get biogas with very high methane content if the biogas reactors are supplied with exogenous hydrogen, and one of the technologies for supplying hydrogen is through gas permeable membranes. In this study the activity and stratification of hydrogen consumption above such a membrane was investigated by use of microsensors for hydrogen and pH. A hydrogenotrophic methanogenic community that was able to consume the hydrogen flux within 0...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27552430/highly-selective-and-sensitive-response-of-30-5-of-sprayed-molybdenum-trioxide-moo3-nanobelts-for-nitrogen-dioxide-no2-gas-detection
#20
A A Mane, M P Suryawanshi, J H Kim, A V Moholkar
The molybdenum trioxide (MoO3) thin films have been successfully deposited onto the glass substrates using chemical spray pyrolysis (CSP) deposition technique at various substrate temperatures ranging from 300°C to 450°C with an interval of 50°C. The effect of substrate temperature on the structural, morphological, optical and gas sensing properties of MoO3 thin films has been thoroughly investigated. X-ray diffraction analysis reveals that all the films have an orthorhombic crystal structure and are polycrystalline in nature...
December 1, 2016: Journal of Colloid and Interface Science
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