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https://www.readbyqxmd.com/read/28641319/understanding-scuba-diving-fatalities-carbon-dioxide-concentrations-in-intra-cardiac-gas
#1
Vincent Varlet, Alejandro Dominguez, Marc Augsburger, Maisy Lossois, Coraline Egger, Cristian Palmiere, Raquel Vilarino, Silke Grabherr
INTRODUCTION: Important developments in the diagnosis of scuba diving fatalities have been made thanks to forensic imaging tool improvements. Multi-detector computed tomography (MDCT) permits reliable interpretation of the overall gaseous distribution in the cadaver. However, due to post-mortem delay, the radiological interpretation is often doubtful because the distinction between gas related to the dive and post-mortem decomposition artifactual gases becomes less obvious. METHODS: We present six cases of fatal scuba diving showing gas in the heart and other vasculature...
June 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/28641233/large-eddy-simulation-and-experimental-study-on-vented-gasoline-air-mixture-explosions-in-a-semi-confined-obstructed-pipe
#2
Guoqing Li, Yang Du, Shimao Wang, Sheng Qi, Peili Zhang, Wenzhuo Chen
In this work, LES simulation coupled with a TFC sub-grid combustion model has been performed in a semi-confined pipe (L/D=10, V=10L) in the presence of four hollow-square obstacles (BR=49.8%) with circular hollow cross-section, in order to study the premixed gasoline-air mixture explosions. The comparisons between simulated results and experimental results have been conducted. It was found that the simulated results were in good agreement with experimental data in terms of flame structures, flame locations and overpressure time histories...
June 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28637304/effects-of-alternative-electron-acceptors-on-the-activity-and-community-structure-of-methane-producing-and-consuming-microbes-in-the-sediments-of-two-shallow-boreal-lakes
#3
Antti J Rissanen, Anu Karvinen, Hannu Nykänen, Sari Peura, Marja Tiirola, Anita Mäki, Paula Kankaala
The role of anaerobic CH4 oxidation in controlling lake sediment CH4 emissions remains unclear. Therefore, we tested how relevant EAs (SO42-, NO3-, Fe3+, Mn4+, O2) affect CH4 production and oxidation in the sediments of two shallow boreal lakes. The changes induced to microbial communities by the addition of Fe3+ and Mn4+ were studied using next-generation sequencing targeting the 16S rRNA and methyl-coenzyme M reductase (mcrA) genes and mcrA transcripts. Putative anaerobic CH4 oxidizing archaea (ANME-2D) and bacteria (NC 10) were scarce (up to 3...
June 15, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28637165/quantification-of-the-methane-concentration-using-anaerobic-oxidation-of-methane-coupled-to-extracellular-electron-transfer
#4
Yaohuan Gao, Hodon Ryu, Bruce E Rittmann, Abid Hussain, Hyung-Sool Lee
A biofilm anode acclimated with growth media containing acetate, then acetate+methane, and finally methane alone produced electrical current in a microbial electrochemical cell (MxC) fed with methane as the sole electron donor. Geobacter was the dominant genus for the bacterial domain (93%) in the biofilm anode, while methanogens (Methanocorpusculum labreanum and Methanosaeta concilii) accounted for 82% of the total archaeal clones in the biofilm. Fluorescence in situ hybridization (FISH) imaging clearly showed a biofilm of mixed bacteria and archaea, suggesting a syntrophic interaction between them for performing anaerobic oxidation of methane (AOM) in the biofilm anode...
June 13, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28637159/methane-production-and-fertilizing-value-of-organic-waste-organic-matter-characterization-for-a-better-prediction-of-valorization-pathways
#5
Julie Jimenez, Han Lei, Jean-Philippe Steyer, Sabine Houot, Dominique Patureau
Organic wastes are potential sources of both energy as well as crop production fertilizers. Correlations and models, involving organic matter characterization, have been previously described by several authors although there is still a lack in knowledge on the potential of simultaneous predictions of methane and organic fertilizer quality to optimize the wastes treatments. A methodology combining chemical accessibility and fluorescence spectroscopy was used to characterize 82 different organic wastes. Characterization data were compared with the biochemical methane potential (BMP), and with the biodegradable organic carbon obtained by soil incubation (C_bio)...
May 31, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28637158/a-reused-method-for-molasses-processed-wastewater-effect-on-silage-quality-and-anaerobic-digestion-performance-of-pennisetum-purpereum
#6
Lianhua Li, Zhenhong Yuan, Yongming Sun, Xiaoying Kong, Pengyu Dong, Jia Zhang
The silage quality and anaerobic digestion performance of Pennisetum purpereum with molasses-processed wastewater addition were assessed. The silage samples with molasses-processed wastewater addition obtained higher lactic acid concentration of 15.18-23.38mg/g FM, lower pH value of 3.96-4.45 and lower NH3-N content of 0.47-0.64mg/g FM. No obvious difference was observed in the dominant phyla and genus, but the relative abundance of Lactobacillus reached up to 77.39%, increased by 84% compared to the silage samples without molasses-processed wastewater addition...
May 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28634638/co-existence-of-anaerobic-ammonium-oxidation-bacteria-and-denitrifying-anaerobic-methane-oxidation-bacteria-in-sewage-sludge-community-diversity-and-seasonal-dynamics
#7
Sai Xu, Wenjing Lu, Muhammad Farooq Mustafa, Luis Miguel Caicedo, Hanwen Guo, Xindi Fu, Hongtao Wang
Anaerobic ammonium oxidation (ANAMMOX) and denitrifying anaerobic methane oxidation (DAMO) have been recently discovered as relevant processes in the carbon and nitrogen cycles of wastewater treatment plants. In this study, the seasonal dynamics of ANAMMOX and DAMO bacterial community structures and their abundance in sewage sludge collected from wastewater treatment plants were analysed. Results indicated that ANAMMOX and DAMO bacteria co-existed in sewage sludge in different seasons and their abundance was positively correlated (P < 0...
June 20, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28634613/breathing-induced-new-phase-transition-in-an-mil-53-al-nh2-metal-organic-framework-under-high-methane-pressures
#8
Linius Bolinois, Tanay Kundu, Xuerui Wang, Yuxiang Wang, Zhigang Hu, Kenny Koh, Dan Zhao
The high pressure methane sorption tests on a flexible metal-organic framework [MIL-53(Al)-NH2] reveal a new phase transition to a large pore (lp) phase above 45 bar. The mixed-ligand strategy and pressure cycling tests are suggested to reduce the pressure requirement of such a phase transition for applications in natural gas storage.
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28634608/hexagonal-boron-nitride-supported-mesosio2-confined-ni-catalysts-for-dry-reforming-of-methane
#9
Yang Cao, Meirong Lu, Jianhui Fang, Liyi Shi, Dengsong Zhang
Based on the superior chemical and thermal stability of hexagonal boron nitride (h-BN), we design and synthesize h-BN supported mesoSiO2-confined Ni catalysts with a stable architecture. The as-prepared catalyst exhibits excellent coke- and sintering-resistance performance in the dry reforming of methane, and especially, there is almost no loss of activity even after a 100 h stability test due to the synergistic effects of the h-BN interface and Ni nanoparticles.
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28634433/the-draft-genome-of-the-non-host-associated-methanobrevibacter-arboriphilus-strain-dh1-encodes-a-large-repertoire-of-adhesin-like-proteins
#10
Anja Poehlein, Rolf Daniel, Henning Seedorf
Methanobrevibacter arboriphilus strain DH1 is an autotrophic methanogen that was isolated from the wetwood of methane-emitting trees. This species has been of considerable interest for its unusual oxygen tolerance and has been studied as a model organism for more than four decades. Strain DH1 is closely related to other host-associated Methanobrevibacter species from intestinal tracts of animals and the rumen, making this strain an interesting candidate for comparative analysis to identify factors important for colonizing intestinal environments...
2017: Archaea: An International Microbiological Journal
https://www.readbyqxmd.com/read/28633966/the-effect-of-feed-composition-on-anaerobic-co-digestion-of-animal-processing-by-products
#11
D Hidalgo, J M Martín-Marroquín, F Corona
Four streams and their mixtures have been considered for anaerobic co-digestion, all of them generated during pig carcasses processing or in related industrial activities: meat flour (MF), process water (PW), pig manure (PM) and glycerin (GL). Biochemical methane potential assays were conducted at 37 °C to evaluate the effects of the substrate mix ratio on methane generation and process behavior. The results show that the co-digestion of these products favors the anaerobic fermentation process when limiting the amount of meat flour in the mixture to co-digest, which should not exceed 10%...
June 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28633838/sonochemically-preparation-and-characterization-of-bimetallic-ni-co-al2o3-zro2-nanocatalyst-effects-of-ultrasound-irradiation-time-and-power-on-catalytic-properties-and-activity-in-dry-reforming-of-ch4
#12
Salar Mahboob, Mohammad Haghighi, Farhad Rahmani
The catalytic performance of nanostructured Ni-Co/Al2O3-ZrO2 catalysts, prepared by ultrasound-assisted impregnation method was examined in the dry reforming of methane. The effect of irradiation power and irradiation time have been studied by changing time (0, 20, 80min) and power of the sonication (30, 60, 90W) during the synthesis which resulted in different physiochemical properties of the nanocatalyst. The nanocatalysts were characterized by XRD, FESEM, PSD, EDX, TEM, TPR-H2, BET, FTIR and TG analyses...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633517/biomethanation-of-sewage-sludge-with-food-waste-leachate-via-co-digestion
#13
Jingyeong Shin, Young Beom Kim, Jong Hun Jeon, Sangki Choi, In Kyu Park, Young Mo Kim
Anaerobic mono- and co-digestion of sewage sludge (SS) and food waste leachate (FWL) were performed by assessing methane production and characterizing microbial communities. Anaerobic digestion (AD) of waste activated sludge (WAS) alone produced the lowest methane production (281 mL-CH4), but an approximately 80% increase in methane production was achieved via co-digestion of WAS and FWL (506 mL-CH4). There were less differences in the diversity of bacterial communities in anaerobic digesters, while archaeal (ARC) and bacterial (BAC) amounts reflected AD's performance...
June 21, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28632963/metal-ion-induced-in-situ-ligand-oxidation-for-self-assembled-clusters-from-bis-5-2-pyridine-2-yl-1-2-4-triazole-3-yl-methane-to-alcohol-or-ketone
#14
Wei-Quan Lin, Yuan-Yuan Peng, Lang Tong, Jian-Hua Jia, Jun-Liang Liu, Yan-Cong Chen, Wen-Bin Chen, Ming-Liang Tong
Hydrothermal reactions of metal nitrates and ligand bis(5-(pyridine-2-yl)-1,2,4-triazol-3-yl)methane (H2L1) on same condition gave three cluster compounds, {Cr2}, {Zn12} and {Fe8}. Notably, methylene group of H2L1 was in situ oxidized either to hydroxymethylated (L2-O)3- in the metallo-ring {Zn12} or to a rigid carbonylated (L3=O)2- in the screw-type {Fe8}. In light of comparative experiment results, NO3- was deduced to be of a catalytic role in ligand oxidation. Metal ions could be regarded as an "induced" tool for clusters generation in self-assembly process...
June 20, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28632173/gene-expression-profiling-reveals-potential-players-of-left-right-asymmetry-in-female-chicken-gonads
#15
Zhiyi Wan, Yanan Lu, Lei Rui, Xiaoxue Yu, Fang Yang, Chengfang Tu, Zandong Li
Most female birds develop only a left ovary, whereas males develop bilateral testes. The mechanism underlying this process is still not completely understood. Here, we provide a comprehensive transcriptional analysis of female chicken gonads and identify novel candidate side-biased genes. RNA-Seq analysis was carried out on total RNA harvested from the left and right gonads on embryonic day 6 (E6), E12, and post-hatching day 1 (D1). By comparing the gene expression profiles between the left and right gonads, 347 differentially expressed genes (DEGs) were obtained on E6, 3730 were obtained on E12, and 2787 were obtained on D1...
June 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28631123/modeling-solubility-of-co2-hydrocarbon-gas-in-ionic-liquid-emim-fap-using-aspen-plus-simulations
#16
Bishwadeep Bagchi, Sushmita Sati, Vidyasagar Shilapuram
The Peng-Robinson equation of state with quadratic van der Waals (vdW) mixing rule model was chosen to perform the thermodynamic calculations in Flash3 column of Aspen Plus to predict the solubility of CO2 or any one of the hydrocarbons (HCs) among methane, ethane, propane, and butane in an ionic liquid 1-ethyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate ([emim][FAP]). Bubble point pressure, solubility, bubble point temperature, fugacity, and partial molar volume at infinite dilution were obtained from the simulations, and enthalpy of absorption, Gibbs free energy of solvation, and entropy change of absorption were estimated by thermodynamic relations...
June 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28630917/mntio3-driven-low-temperature-oxidative-coupling-of-methane-over-tio2-doped-mn2o3-na2wo4-sio2-catalyst
#17
Pengwei Wang, Guofeng Zhao, Yu Wang, Yong Lu
Oxidative coupling of methane (OCM) is a promising method for the direct conversion of methane to ethene and ethane (C2 products). Among the catalysts reported previously, Mn2O3-Na2WO4/SiO2 showed the highest conversion and selectivity, but only at 800° to 900°C, which represents a substantial challenge for commercialization. We report a TiO2-doped Mn2O3-Na2WO4/SiO2 catalyst by using Ti-MWW zeolite as TiO2 dopant as well as SiO2 support, enabling OCM with 26% conversion and 76% C2-C3 selectivity at 720°C because of MnTiO3 formation...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630465/changes-in-pore-structure-of-coal-caused-by-coal-to-gas-bioconversion
#18
Rui Zhang, Shimin Liu, Jitendra Bahadur, Derek Elsworth, Yi Wang, Guanglong Hu, Yanna Liang
Microbial enhanced coalbed methane (ME-CBM) recovery is critically examined as a viable technology for natural gas recovery from coalbed methane (CBM) reservoirs. Since the majority of gas-in-place (GIP) is stored as an adsorbed phase in fine pores of coal matrix, the nano-pore structure directly influences gas storage and transport properties. Only limited studies have quantified the alteration of the nano-pore structure due to ME-CBM treatment. This study examines the evolution of the pore structure using a combination of small angle X-ray scattering (SAXS), low-pressure N2 and CO2 adsorption (LPGA) and high-pressure methane adsorption methods...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28630125/communal-metabolism-of-methane-and-the-rare-earth-element-switch
#19
Zheng Yu, Ludmila Chistoserdova
Metabolism of methane is an important part of biogeochemical cycling of carbon. Methane is also a major contributor to climate change. A specialized group of microbes that consume methane, the methanotrophs, represent a natural filter preventing an even faster accumulation of methane in the atmosphere. Methanotrophy can proceed via both anaerobic and aerobic modes. The anaerobic methanotrophs, represented by both archaea and bacteria, all appear to be engaged in syntrophic interdependencies with other species, to overcome the energetic barriers of methane metabolism in the absence of oxygen...
June 19, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28629709/energy-recovery-from-one-and-two-stage-anaerobic-digestion-of-food-waste
#20
Giorgia De Gioannis, Aldo Muntoni, Alessandra Polettini, Raffaella Pomi, Daniela Spiga
One- and two-stage anaerobic digestion of food waste aimed at recovering methane (CH4) and hydrogen and methane (H2+CH4), respectively, were compared in order to assess the potential benefits from the two-stage process in terms of overall energy recovery. Results suggest that a two-stage process where the first reactor is properly operated in order to achieve a significant net hydrogen production, may display a 20% comparatively higher energy recovery yield as a result, mainly, of enhanced methane production as well as of the associated hydrogen production...
June 16, 2017: Waste Management
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