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https://www.readbyqxmd.com/read/28930632/co2-absorption-in-the-ionic-liquids-immobilized-on-solid-surface-by-molecular-dynamics-simulation
#1
Ziqian Tang, Linghong Lu, Zhongyang Dai, Wenlong Xie, Lili Shi, Xiaohua Lu
Based on our previous experimental research, we studied the absorption of CO2 in the ionic liquid, 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([hmim][Tf2N] ), immobilized on TiO2 [rutile (110) ] with different thickness by molecular dynamics simulation. The effects of the properties (hydrophobicity and hydrophilicity) of solid interfaces were also studied with IL immobilized on graphite and TiO2 respectively. We studied the influence of the thickness of IL immobilized on TiO2 on the absorption of CO2 via structural and dynamical properties...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28925477/the-study-on-the-effect-of-hyperglycemia-on-offspring-fatty-tissue-metabolism-during-pregnancy
#2
H-P Dong, M-Z Tan, Q-J Liu, J Wang, S-B Zhong
OBJECTIVE: In this study, we adopted maternal diabetes model on rats, which induced by streptozotocin to explore the metabolism changes of rat adipose tissue during the neonatal period. MATERIALS AND METHODS: The female rats were induced as diabetes models by streptozotocin (STZ), and mated with the normal male rats when they entered into adulthood. The chosen male offspring rats were executed at week 12 and the epididymis and subcutaneous fat pad were obtained...
August 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28924017/in-silico-analysis-of-the-regulation-of-the-photosynthetic-electron-transport-chain-in-c3-plants
#3
Alejandro Morales, Xinyou Yin, Jeremy Harbinson, Steven Michiel Driever, Jaap Molenaar, David M Kramer, Paul Struik
We present a new simulation model of the reactions in the photosynthetic electron transport chain of C3 species. We show that including recent insights about the regulation of the thylakoid proton motive force, ATP/NADPH balancing mechanisms (cyclic and non-cyclic alternative electron transport), and regulation of Rubisco activity, leads to emergent behaviors that may affect the operation and regulation of photosynthesis under different dynamic environmental conditions. The model was parameterized with experimental results in the literature, with a focus on Arabidopsis thaliana...
September 18, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28918522/simulations-and-experimental-investigations-of-the-competitive-adsorption-of-ch4-and-co2-on-low-rank-coal-vitrinite
#4
Song Yu, Jiang Bo, Li Jiahong
The mechanism for the competitive adsorption of CH4 and CO2 on coal vitrinite (DV-8, maximum vitrinite reflectance R o,max = 0.58%) was revealed through simulation and experimental methods. A saturated state was reached after absorbing 17 CH4 or 22 CO2 molecules per DV-8 molecule. The functional groups (FGs) on the surface of the vitrinite can be ranked in order of decreasing CH4 and CO2 adsorption ability as follows: [-CH3] > [-C=O] > [-C-O-C-] > [-COOH] and [-C-O-C-] > [-C=O] > [-CH3] > [-COOH]...
September 16, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28888452/inactivation-mechanism-of-vibrio-parahaemolyticus-via-supercritical-carbon-dioxide-treatment
#5
Feiyue Xu, Xiaomei Feng, Xiao Sui, Hong Lin, Yuqian Han
The effects of supercritical carbon dioxide (SC-CO2) treatments on Vibrio parahaemolyticus cells were determined using viable plate count method at different treatment times (10 and 40min), pressures (10-25MPa), and temperature (40°C). Using the changes in the physical (absorbance, transmission electron microscope and contents of fatty acids) and chemical indexes (pH value, activity of Na(+)K(+)-ATPase, SDS-PAGE) were for further understand the mechanisms of bacterial inactivation under SC-CO2. The result showed that 25MPa treatment for 40min in 40°C could significantly (P<0...
October 2017: Food Research International
https://www.readbyqxmd.com/read/28869377/saccharomyces-cerevisiae%C3%A2-and%C3%A2-kluyveromyces-marxianus%C3%A2-co-cultures-allow-to-reduce-fodmap-levels-in-whole-wheat-bread
#6
Nore Struyf, Jitka Laurent, Joran Verspreet, Kevin J Verstrepen, Christophe M Courtin
FODMAPs (Fermentable Oligo-, Di-, and Monosaccharides and Polyols) are small molecules that are poorly absorbed in the small intestine and rapidly fermented in the large intestine. There is evidence that a diet low in FODMAPs reduces abdominal symptoms in approx. 70% of the patients suffering from irritable bowel syndrome. Wheat contains relatively high fructan levels and is therefore a major source of FODMAPs in our diet. In this study, a yeast-based strategy was developed to reduce FODMAP levels in bread...
September 4, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28845887/syntheses-of-exceptionally-stable-al-iii-metal-organic-frameworks-how-to-grow-high-quality-large-single-crystals
#7
Ya-Qian Lan, Yuanyuan Guo, Jun Zhang, Longzhang Dong, Yan Xu, Wei Han, Min Fang, Hong-Ke Liu, Yong Wu
The difficulty of obtaining large single crystals of aluminum carboxylate MOFs (Al-MOFs) for structure determinations has limited the development of these water and thermally stable MOFs. In this work, how large single crystals of the known MIL-53(Al) and the first two tetrahedral ligand based, visible light absorbing 3D Al-MOFs, [Al3(OH)3(HTCS)2] (AlTCS-1) and [Al5O2(OH)3(TCS)2(H2O)2] (AlTCS-2) (TCS = tetrakis(4-oxycarbonylphenyl) silane) are obtained in the presence of hydrofluoric or formic acid for conventional single-crystal diffraction measurements are presented, demonstrating a general method of obtaining large and good quality single crystals of Al-MOFs...
August 28, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28840652/computer-assisted-design-of-imidazolate-based-ionic-liquids-for-improving-so2-capture-co2-capture-and-so2-co2-selectivity
#8
Guokai Cui, Ning Zhao, Jianji Wang, Congmin Wang
A new strategy using computer-assisted design of substituted imidazolate-based ionic liquids (ILs) through tuning the absorption enthalpy as well as the basicity of ILs for improving SO2 capture, CO2 capture, and SO2/CO2 selectivity was reported. The best substituted imidazolate-based ILs as absorbents for different applications were predicted at first. During the absorption, a high SO2 capacity up to 5.28 and 2.38 mole SO2 per mole IL could be achieved by ILs with CH3-imidazolate anion under 1.0 and 0.1 bar, respectively, through tuning multiple N∙∙∙S interactions between SO2 and N atoms in the imidazolate anion with different substituent...
August 24, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28836084/effect-of-ultrasonic-irradiation-on-bacterial-biofilms
#9
Harumi Koibuchi, Yasutomo Fujii, Yoshikazu Hirai, Takashi Mochizuki, Kohji Masuda, Kazuhiko Kotani, Toshiyuki Yamada, Nobuyuki Taniguchi
PURPOSE: The purpose of this study was to clarify the effect of ultrasonic irradiation on biofilm produced by Staphylococcus epidermidis (S. epidermidis), which causes central venous catheter-related infections. MATERIALS AND METHODS: Staphylococcus epidermidis (S. epidermidis, ATCC 35984 RP 62A) was used in this study. First, biofilm was prepared from S. epidermidis on the bottom of the upper left well of a 6-well plate. Next, the biofilm was irradiated for 24 h with 1-MHz ultrasound (US) in the continuous wave mode to serve as the US irradiation group...
August 23, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28831757/development-of-a-circulation-direct-sampling-and-monitoring-system-for-o2-and-co2-concentrations-in-the-gas-liquid-phases-of-shake-flask-systems-during-microbial-cell-culture
#10
Masato Takahashi, Yoshisuke Sawada, Hideki Aoyagi
Monitoring the environmental factors during shake-flask culture of microorganisms can help to optimise the initial steps of bioprocess development. Herein, we developed a circulation direct monitoring and sampling system (CDMSS) that can monitor the behaviour of CO2 and O2 in the gas-liquid phases and obtain a sample without interrupting the shaking of the culture in Erlenmeyer flasks capped with breathable culture plugs. Shake-flask culturing of Escherichia coli using this set-up indicated that a high concentration of CO2 accumulated not only in the headspace (maximum ~100 mg/L) but also in the culture broth (maximum ~85 mg/L) during the logarithmic phase (4...
August 23, 2017: AMB Express
https://www.readbyqxmd.com/read/28831619/important-role-of-calcium-chloride-in-preventing-carbon-monoxide-generation-during-desflurane-degradation-with-alkali-hydroxide-free-carbon-dioxide-absorbents
#11
Takahiro Ando, Atsushi Mori, Rie Ito, Kimitoshi Nishiwaki
We investigated whether calcium chloride (CaCl2), a supplementary additive in carbon dioxide (CO2) absorbents, could affect carbon monoxide (CO) production caused by desflurane degradation, using a Japanese alkali-free CO2 absorbent Yabashi Lime(®)-f (YL-f), its CaCl2-free and 1% CaCl2-added derivatives, and other commercially available alkali-free absorbents with or without CaCl2. The reaction between 1 L of desflurane gas (3-10%) and 20 g of desiccated specimen was performed in an artificial closed-circuit anesthesia system for 3 min at 20 or 40 °C...
August 22, 2017: Journal of Anesthesia
https://www.readbyqxmd.com/read/28829333/phase-current-absorbance-and-photoluminescence-of-double-and-triple-metal-ion-doped-synthetic-and-salmon-dna-thin-films
#12
Prathamesh Chopade, Sreekantha Reddy Dugasani, Mallikarjuna Reddy Kesama, Sanghyun Yoo, Bramaramba Gnapareddy, Yun Woo Lee, Sohee Jeon, Jun-Ho Jeong, Sung Ha Park
We fabricated synthetic double-crossover (DX) DNA lattices and natural salmon DNA (SDNA) thin films, doped with 3 combinations of double divalent metal ions (M(2+))-doped groups (Co(2+)-Ni(2+), Cu(2+)-Co(2+), and Cu(2+)-Ni(2+)) and single combination of a triple M(2+)-doped group (Cu(2+)-Ni(2+)-Co(2+)) at various concentrations of M(2+) ([M(2+)]). We evaluated the optimum concentration of M(2+) ([M(2+)]O) (the phase of M(2+)-doped DX DNA lattices changed from crystalline (up to ([M(2+)]O) to amorphous (above [M(2+)]O)) and measured the current, absorbance, and photoluminescent characteristics of multiple M(2+)-doped SDNA thin films...
August 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28819714/utilization-of-waste-bittern-from-saltern-as-a-source-for-magnesium-and-an-absorbent-for-carbon-dioxide-capture
#13
Choon-Ki Na, Hyunju Park, Eun Hea Jho
During solar salt production, large quantities of bittern, a liquid by-product containing high inorganic substance concentrations, are produced. The purpose of this research was to examine the utilization of waste bittern generated from salterns as a source for Mg production and as an absorbent for carbon dioxide (CO2) capture. The study was conducted in a sequential two-step process. At NaOH/Mg molar ratios of 2.70-2.75 and pH 9.5-10.0, > 99% Mg precipitation from the bittern was achieved. After washing with water, 100-120 g/L of precipitate containing 94% Mg(OH)2 was recovered from the bittern...
August 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28800535/computational-investigation-of-the-nitrosation-mechanism-of-piperazine-in-co2-capture
#14
Qi Yu, Pan Wang, Fangfang Ma, Hong-Bin Xie, Ning He, Jingwen Chen
Quantum chemistry calculations and kinetic modeling were performed to investigate the nitrosation mechanism and kinetics of diamine piperazine (PZ), an alternative solvent for widely used monoethanolamine in postcombustion CO2 capture (PCCC), by two typical nitrosating agents, NO2(-) and N2O3, in the presence of CO2. Various PZ species and nitrosating agents formed by the reactions of PZ, NO2(-), and N2O3 with CO2 were considered. The results indicated that the reactions of PZ species having NH group with N2O3 contribute the most to the formation of nitrosamines in the absorber unit of PCCC and follow a novel three-step nitrosation mechanism, which is initiated by the formation of a charge-transfer complex...
November 2017: Chemosphere
https://www.readbyqxmd.com/read/28756864/preparation-and-characterization-of-carbonic-anhydrase-conjugated-liposomes-for-catalytic-synthesis-of-calcium-carbonate-particles
#15
Keisuke Maeshima, Makoto Yoshimoto
The biomimetic approach using immobilized enzymes is useful for the synthesis of structurally defined inorganic materials. In this work, carbonic anhydrase (CA) from bovine erythrocytes was covalently conjugated at 25°C to the liposomes composed of 15mol% 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine-N-(glutaryl) (NG-POPE), and the zwitterionic and anionic phospholipids with the same acyl chains as NG-POPE. For the conjugation, the carboxyl groups of liposomal NG-POPE were activated with 11mM 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and 4...
October 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28745768/the-sos-chromotest-applied-for-screening-plant-antigenotoxic-agents-against-ultraviolet-radiation
#16
J L Fuentes, A García Forero, N Quintero Ruiz, C A Prada Medina, N Rey Castellanos, D A Franco Niño, D A Contreras García, Y Córdoba Campo, E E Stashenko
In this work, we investigated the usefulness of the SOS Chromotest for screening plant antigenotoxic agents against ultraviolet radiation (UV). Fifty Colombian plant extracts obtained by supercritical fluid (CO2) extraction, twelve plant extract constituents (apigenin, carvacrol, β-caryophyllene, 1,8-cineole, citral, p-cymene, geraniol, naringenin, pinocembrin, quercetin, squalene, and thymol) and five standard antioxidant and/or photoprotective agents (curcumin, epigallocatechin gallate, resveratrol, α-tocopherol, and Trolox®) were evaluated for their genotoxicity and antigenotoxicity against UV using the SOS Chromotest...
September 13, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28743996/antecedent-soil-moisture-prior-to-freezing-can-affect-quantity-composition-and-stability-of-soil-dissolved-organic-matter-during-thaw
#17
Haohao Wu, Xingkai Xu, Weiguo Cheng, Pingqing Fu, Fayun Li
There are large amounts of dissolved organic matter (DOM) released into the soil during spring thaw, but its bioavailability and components are still unknown. The quantity, composition and stability of DOM in water extracts of forest soils during thaw were studied after two-month freezing with 9 levels of soil moisture ranging from 10% to 90% water-filled pore space (WFPS), by measuring soil carbon dioxide (CO2) flux, biodegradable dissolved organic carbon (BDOC) and nitrogen (BDON), ultraviolet absorbance and parallel factor analysis of fluorescence excitation-emission matrices...
July 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28742934/efficient-photoelectrochemical-reduction-of-carbon-dioxide-to-formic-acid-a-functionalized-ionic-liquid-as-an-absorbent-and-electrolyte
#18
Weiwei Lu, Bo Jia, Beilei Cui, Yuan Zhang, Kaisheng Yao, Yuling Zhao, Jianji Wang
Photoelectrochemical (PEC) reduction of carbon dioxide (CO2 ) is a potential method for production of fuels and chemicals from a C1 feedstock accumulated in the atmosphere. However, the low solubility of CO2 in water, and complicated processes associated with capture and conversion, render CO2 conversion inefficient. A new concept is proposed in which a PEC system is used to capture and convert CO2 into formic acid. The process is assisted by an ionic liquid (1-aminopropyl-3-methylimidazolium bromide) aqueous solution, which functions as an absorbent and electrolyte at ambient temperature and pressure...
September 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28734252/river-sequesters-atmospheric-carbon-and-limits-the-co2-degassing-in-karst-area-southwest-china
#19
Tao Zhang, Jianhong Li, Junbing Pu, Jonathan B Martin, Mitra B Khadka, Feihong Wu, Li Li, Feng Jiang, Siyu Huang, Daoxian Yuan
CO2 fluxes across water-air interfaces of river systems play important roles in regulating the regional and global carbon cycle. However, great uncertainty remains as to the contribution of these inland water bodies to the global carbon budget. Part of the uncertainty stems from limited understanding of the CO2 fluxes at diurnal and seasonal frequencies caused by aquatic metabolism. Here, we measured surface water characteristics (temperature, pH, and DO, DIC, Ca(2+) concentrations) and CO2 fluxes across the air-water interface at two transects of Guijiang River, southwest China to assess the seasonal and diurnal dynamics of fluvial carbon cycling and its potential role in regional and global carbon budgets...
December 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28732976/preparation-of-waterborne-dispersions-of-epoxy-resin-by-ultrasonic-assisted-supercritical-co2-nanoemulsification-technique
#20
Hanyang Gao, Guoxin Hu, Kun Liu, Liqun Wu
Waterborne nanoemulsion of diglycidyl ether of bisphenol A type epoxy resin (DGEBA) with droplet size of around 124nm was prepared by using an ultrasonic-assisted supercritical carbon dioxide (scCO2) technique in an autoclave reactor at a low temperature (32°C). A view cell positioned in-line with the ultrasonic probe allowed observation of the emulsification process. From the image analysis and droplet size measurement, the influence mechanisms of the ultrasonic power, the degree of mixing of scCO2 with DGEBA, the adding amount of emulsifier, and the system pressure on emulsification process and emulsion droplet size were investigated...
November 2017: Ultrasonics Sonochemistry
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