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Co2 absorber

Su Young Kim, Jun-Won Chung, Dong Kyun Park, Kwang An Kwon, Kyoung Oh Kim, Yoon Jae Kim, Jung Ho Kim
BACKGROUND AND AIMS: Endoscopy is performed with air insufflation and is usually associated with abdominal pain. It is well recognized that carbon dioxide (CO2) is absorbed more quickly into the body than air; however, to date, few studies have investigated the use of CO2 insufflation during consecutive esophagogastroduodenoscopy and colonoscopy (CEC). Thus, this study evaluated the efficacy of CO2 insufflation compared with air insufflation in CEC. METHODS: From March 2014 to April 2016, a total of 215 consecutive patients were randomly assigned to receive CO2 insufflation (CO2 group, n=108) or air insufflation (air group, n=107)...
November 23, 2016: Gastrointestinal Endoscopy
Xuanlong Ma, Alfredo Huete, James Cleverly, Derek Eamus, Frédéric Chevallier, Joanna Joiner, Benjamin Poulter, Yongguang Zhang, Luis Guanter, Wayne Meyer, Zunyi Xie, Guillermo Ponce-Campos
Each year, terrestrial ecosystems absorb more than a quarter of the anthropogenic carbon emissions, termed as land carbon sink. An exceptionally large land carbon sink anomaly was recorded in 2011, of which more than half was attributed to Australia. However, the persistence and spatially attribution of this carbon sink remain largely unknown. Here we conducted an observation-based study to characterize the Australian land carbon sink through the novel coupling of satellite retrievals of atmospheric CO2 and photosynthesis and in-situ flux tower measures...
November 25, 2016: Scientific Reports
Shizue Matsubara, Trang Schneider, Veronica G Maurino
Changes in light intensity directly affect the performance of the photosynthetic apparatus. Light energy absorbed in excess of cells' needs leads to production of reactive oxygen species and photo-oxidative damage. Excess light in both constant and dynamic environments induces photoprotective acclimation in plants. Distinct sets of signals and regulatory mechanisms are involved in acclimatory adjustment of photoprotection and photosynthesis under constant and dynamic (fluctuating) light conditions. We are still far away from drawing a comprehensive picture of acclimatory signal transduction pathways, particularly in dynamic environments...
2016: Frontiers in Plant Science
Ricardo Grau-Crespo, Alex Aziz, Angus W Collins, Rachel Crespo-Otero, Norge C Hernández, L Marleny Rodriguez-Albelo, A Rabdel Ruiz-Salvador, Sofia Calero, Said Hamad
Tuning the electronic structure of metal-organic frameworks is the key to extending their functionality to the photocatalytic conversion of absorbed gases. Herein we discuss how the band edge positions in zeolitic imidazolate frameworks (ZIFs) can be tuned by mixing different imidazole-based linkers within the same structure. We present the band alignment for a number of known and hypothetical Zn-based ZIFs with respect to the vacuum level. Structures with a single type of linker exhibit relatively wide band gaps; however, by mixing linkers of a low-lying conduction edge with linkers of a high-lying valence edge, we can predict materials with ideal band positions for visible-light water splitting and CO2 reduction photocatalysis...
November 15, 2016: Angewandte Chemie
Baoshan Guo, Cheng Lei, Takuro Ito, Yiyue Jiang, Yasuyuki Ozeki, Keisuke Goda
The development of reliable, sustainable, and economical sources of alternative fuels is an important, but challenging goal for the world. As an alternative to liquid fossil fuels, algal biofuel is expected to play a key role in alleviating global warming since algae absorb atmospheric CO2 via photosynthesis. Among various algae for fuel production, Euglena gracilis is an attractive microalgal species as it is known to produce wax ester (good for biodiesel and aviation fuel) within lipid droplets. To date, while there exist many techniques for inducing microalgal cells to produce and accumulate lipid with high efficiency, few analytical methods are available for characterizing a population of such lipid-accumulated microalgae including E...
2016: PloS One
Feiqiang He, Xianhe Deng, Min Chen
(NH2)2CO as well as Fe(II)EDTA is an absorbent for simultaneous desulfurization and denitrification. However, they have their own drawbacks, like the oxidation of Fe(II)EDTA and the low solubility of NO in urea solution. To overcome these defects, A mixed absorbent containing both (NH2)2CO and Fe(II)EDTA was employed. The effects of various operating parameters (urea and Fe(II)EDTA concentration, temperature, inlet oxygen concentration, pH value) on NO removal were examined in the packed tower. The results indicated that the NO removal efficiency increased with the decrease of oxygen concentration as well as the increase of Fe(II)EDTA concentration...
November 8, 2016: Chemosphere
Xiaxia Meng, Dengwu Li, Dan Zhou, Dongmei Wang, Qiaoxiao Liu, Sufang Fan
ETHNOPHARMACOLOGICAL RELEVANCE: Juniperus rigida is used as Tibetan and Mongolian medicine in China for the treatment of rheumatoid arthritis, nephritis, brucellosis and other various inflammatory diseases. AIM OF THE STUDY: To evaluate antibacterial potential of essential oils from J. rigida leaves against Klebsiella pneumoniae and to examine its possible related mechanisms. The study was undertaken in order to scientifically validate the traditional use of J. rigida...
October 18, 2016: Journal of Ethnopharmacology
Seokjin Suh, Xiangpeng Meng, Sanghoon Ko
The objective of this study was to develop different-sized chitosan nanoparticles as CO2-based food quality indicators. Chitosan nanoparticles were fabricated with different sizes (small, 300nm; medium, 500nm; and large, 1000nm) by ionic gelation. To investigate the performance of chitosan nanoparticles as CO2 indicators, they were suspended in aqueous solution at pH 8.0. Changes in the pH and absorbance of the suspension were measured over time, the absorbance at the transition appearance time being calculated using the inverse-Hill function...
December 1, 2016: Talanta
Dany P Moualeu-Ngangue, Tsu-Wei Chen, Hartmut Stützel
Gas exchange (GE) and chlorophyll fluorescence (CF) measurements are widely used to noninvasively study photosynthetic parameters, for example the rates of maximum Rubisco carboxylation (Vcmax ), electron transport rate (J), daytime respiration (Rd ) and mesophyll conductance (gm ). Existing methods for fitting GE data (net assimilation rate-intercellular space CO2 concentration (A-Ci ) curve) are based on two assumptions: gm is unvaried with CO2 concentration in the intercellular space (Ci ); and light absorption (α) and the proportion of quanta absorbed by photosystem II (β) are constant in the data set...
October 21, 2016: New Phytologist
Haiyang Zhang, Ruili Guo, Jinpeng Hou, Zhong Wei, Xueqin Li
In this study, a carbon nanotubes composite coated with N-isopropylacrylamide hydrogel (NIPAM-CNTs) has been synthesized. Mixed matrix membranes (MMMs) were fabricated by incorporating NIPAM-CNTs composite filler into poly(ether-block-amide) (Pebax® MH 1657) matrix for efficient CO2 separation. The as-prepared NIPAM-CNTs composite filler mainly plays two roles: i) The extraordinary smooth one-dimensional nanochannels of CNTs act as the highways to accelerate CO2 transport through membranes, increasing CO2 permeability; ii) The NIPAM hydrogel layer coated on the outer walls of CNTs acts as the super water absorbent to increase water content of membranes, appealing both CO2 permeability and CO2/gas selectivity...
October 10, 2016: ACS Applied Materials & Interfaces
Rachael M Heuer, Martin Grosell
Energetic costs associated with ion and acid-base regulation in response to ocean acidification have been predicted to decrease the energy available to fish for basic life processes. However, the low cost of ion regulation (6-15% of standard metabolic rate) and inherent variation associated with whole-animal metabolic rate measurements have made it difficult to consistently demonstrate such a cost. Here we aimed to gain resolution in assessing the energetic demand associated with acid-base regulation by examining ion movement and O2 consumption rates of isolated intestinal tissue from Gulf toadfish acclimated to control or 1900 μatm CO2 (projected for year 2300)...
September 29, 2016: Scientific Reports
Lin Li, Guoqiang Zhang, Qinhong Wang
BACKGROUND: Microalgae, which can absorb carbon dioxide and then transform it into lipid, are promising candidates to produce renewable energy, especially biodiesel. The paucity of genomic information, however, limits the development of genome-based genetic modification to improve lipid production in many microalgae. Here, we describe the de novo sequencing, transcriptome assembly, annotation and differential expression analysis for Chlorella sorokiniana cultivated in different conditions to reveal the change of genes expression associated with lipid accumulation and photosynthetic carbon fixation...
September 26, 2016: BMC Microbiology
Cristian Moya, Noelia Alonso-Morales, Miguel A Gilarranz, Juan J Rodriguez, Jose Palomar
The potential advantages of applying encapsulated ionic liquid (ENIL) to CO2 capture by chemical absorption with 1-butyl-3-methylimidazolium acetate [bmim][acetate] are evaluated. The [bmim][acetate]-ENIL is a particle material with solid appearance and 70 % w/w in ionic liquid (IL). The performance of this material as CO2 sorbent was evaluated by gravimetric and fixed-bed sorption experiments at different temperatures and CO2 partial pressures. ENIL maintains the favourable thermodynamic properties of the neat IL regarding CO2 absorption...
September 19, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Yuye Zhang, Zhixin Zhou, Yanfei Shen, Qing Zhou, Jianhai Wang, Anran Liu, Songqin Liu, Yuanjian Zhang
Responsive assembly of 2D materials is of great interest for a range of applications. In this work, interfacial functionalized carbon nitride (CN) nanofibers were synthesized by hydrolyzing bulk CN in sodium hydroxide solution. The reversible assemble and disassemble behavior of the as-prepared CN nanofibers was investigated by using CO2 as a trigger to form a hydrogel network at first. Compared to the most widespread absorbent materials such as active carbon, graphene and previously reported supramolecular gel, the proposed CN hydrogel not only exhibited a competitive absorbing capacity (maximum absorbing capacity of methylene blue up to 402 mg/g) but also overcame the typical deficiencies such as poor selectivity and high energy-consuming regeneration...
September 27, 2016: ACS Nano
Charles V Brand, Edward Graham, Javier Rodríguez, Amparo Galindo, George Jackson, Claire S Adjiman
Predictive models play an important role in the design of post-combustion processes for the capture of carbon dioxide (CO2) emitted from power plants. A rate-based absorber model is presented to investigate the reactive capture of CO2 using aqueous monoethanolamine (MEA) as a solvent, integrating a predictive molecular-based equation of state: SAFT-VR SW (Statistical Associating Fluid Theory-Variable Range, Square Well). A distinctive physical approach is adopted to model the chemical equilibria inherent in the process...
October 20, 2016: Faraday Discussions
Bowen Deng, Juanjuan Tang, Xuhui Mao, Yuqiao Song, Hua Zhu, Wei Xiao, Dihua Wang
Efficient and high-flux capture of CO2 is the prerequisite of its utilization. Static absorption of CO2 with solid Li2O and molten salts (Li2O-free and Li2O-containing Li-Na-K carbonates) was investigated using a reactor with in situ pressure monitoring. The absorption capacity of dissolved Li2O was 0.835 molCO2/molLi2O at 723 K, larger than that of solid Li2O. For the solid Li2O absorbents, formation of solid Li2CO3 on the surface can retard the further reactions between Li2O and CO2, whereas the dissociation/dissolution effect of molten carbonate on Li2O improved the mass-specific absorption capacity of liquid Li2O...
October 4, 2016: Environmental Science & Technology
Takatoshi Sakamoto, Shigeto Kachi, Shohei Nakamura, Shinsuke Miki, Hideaki Kitajima, Hiroshi Yuasa
This study investigated how the inclusion of magnesium oxide (MgO) maintained tablet hardness during storage in an unpackaged state. Tablets were prepared with a range of MgO levels and stored at 40°C with 75% relative humidity for up to 14 d. The hardness of tablets prepared without MgO decreased over time. The amount of added MgO was positively associated with tablet hardness and mass from an early stage during storage. Investigation of the water sorption properties of the tablet components showed that carmellose water sorption correlated positively with the relative humidity, while MgO absorbed and retained moisture, even when the relative humidity was reduced...
2016: Chemical & Pharmaceutical Bulletin
Wooyul Kim, Eran Edri, Heinz Frei
Artificial photosynthesis is an attractive approach for renewable fuel generation because it offers the prospect of a technology suitable for deployment on highly abundant, non-arable land. Recent leaps forward in the development of efficient and durable light absorbers and catalysts for oxygen evolution and the growing attention to catalysts for carbon dioxide activation brings into focus the tasks of hierarchically integrating the components into assemblies for closing of the photosynthetic cycle. A particular challenge is the efficient coupling of the multi-electron processes of CO2 reduction and H2O oxidation...
September 20, 2016: Accounts of Chemical Research
Dengxu Wang, Shengyu Feng, Hongzhi Liu
Two series of new polyhedral oligomeric silsesquioxane (POSS)-based fluorescent hybrid porous polymers, HPP-1 and HPP-2, have been prepared by the Heck reaction of octavinylsilsesquioxane with 2,2',7,7'-tetrabromo-9,9'-spirobifluorene and 1,3,6,8-tetrabromopyrene, respectively. Three sets of reaction conditions were employed to assess their effect on fluorescence. These materials exhibit tunable fluorescence from nearly no fluorescence to bright fluorescence both in the solid state and dispersed in ethanol under UV light irradiation by simply altering the reaction conditions...
September 26, 2016: Chemistry: a European Journal
Xinwei Yang, Wenqiang Liu, Jian Sun, Yingchao Hu, Wenyu Wang, Hongqiang Chen, Yang Zhang, Xian Li, Minghou Xu
New alkali-doped (Na2 CO3 and K2 CO3 ) Li4 SiO4 sorbents with excellent performance at low CO2 concentrations were synthesized. We speculate that alkali doping breaks the orderly arrangement of the Li4 SiO4 crystals, hence increasing its specific surface area and the number of pores. It was shown that 10 wt % Na2 CO3 and 5 wt % K2 CO3 are the optimal additive ratios for doped sorbents to attain the highest conversions. Moreover, under 15 vol % CO2 , the doped sorbents present clearly faster absorption rates and exhibit stable cyclic durability with impressive conversions of about 90 %, at least 20 % higher than that of non-doped Li4 SiO4 ...
September 8, 2016: ChemSusChem
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