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https://www.readbyqxmd.com/read/28110234/effect-of-ethylenediamine-n-n-disuccinic-acid-edds-on-the-speciation-and-bioavailability-of-fe-2-in-the-presence-of-sulfide-in-anaerobic-digestion
#1
Pham Minh Thanh, Balachandran Ketheesan, Zhou Yan, David Stuckey
The effects of a biodegradable chelating agent, Ethylenediamine-N,N'-disuccinic acid (EDDS), on the speciation and bioavailability of iron (Fe(2+)) in anaerobic digestion were examined. Fe(2+) supplementation at 10mg/L increased methane yield, but the presence of 8mg/L sulfide led to the precipitation of Fe(2+) as FeS which limited its bioavailability. The results confirmed that the EDDS could replace common chelating agents with low biodegradability (EDTA and NTA), and improve the bioavailability of Fe(2+) by forming an Fe-EDDS complex, thereby protecting Fe(2+) from sulfide precipitation...
January 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28109588/tea-saponin-reduced-methanogenesis-in-vitro-but-increased-methane-yield-in-lactating-dairy-cows
#2
J Guyader, M Eugène, M Doreau, D P Morgavi, C Gérard, C Martin
The effect of tea saponin supplementation in the ruminant diet on methane emissions, rumen fermentation, and digestive processes is still under debate. The objective of this study was to assess the effect of this plant extract on methanogenesis, total-tract digestibility, and lactating performances of dairy cows. The work included 2 independent and successive experiments. First, the effect of 7 tea saponin doses (from 0 to 0.50 g/L) on methane emissions and protozoa concentrations was tested in 2 repeated in vitro batch culture incubations using bovine rumen contents as inoculum and a cereal mixture as substrate...
January 18, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28108763/carbon-source-regulation-of-gene-expression-in-methylosinus-trichosporium-ob3b
#3
Muhammad Farhan Ul Haque, Wenyu Gu, Bipin S Baral, Alan A DiSpirito, Jeremy D Semrau
Gene expression in methanotrophs has been shown to be affected by the availability of a variety of metals, most notably copper regulating expression of alternative forms of methane monooxygenase. Here, we show that growth substrate also affects expression of genes encoding for enzymes responsible for the oxidation of methane to formaldehyde and the assimilation of carbon. Specifically, in Methylosinus trichosporium OB3b, expression of genes involved in the conversion of methane to methanol (pmoA and mmoX) and methanol to formaldehyde (mxaF, xoxF1, and xoxF2) as well as in carbon assimilation (fae1, fae2, metF, and sga) decreased when this strain was grown on methanol vs...
January 20, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28107724/effect-of-sole-or-combined-administration-of-nitrate-and-3-nitro-1-propionic-acid-on-fermentation-and-salmonella-survivability-in-alfalfa-fed-rumen-cultures-in-vitro
#4
Alejandro Castañeda Correa, Julian Trachsel, Heather K Allen, Agustin Corral-Luna, Hector Gutierrez-Bañuelos, Pedro Antonia Ochoa-Garcia, Oscar Ruiz-Barrera, Michael E Hume, Todd R Callaway, Roger B Harvey, Ross C Beier, Robin C Anderson, David J Nisbet
Ruminal methanogenesis is a digestive inefficiency resulting in the loss of dietary energy consumed by the host and contributing to environmental methane emission. Nitrate is being investigated as a feed supplement to reduce rumen methane emissions but safety and efficacy concerns persist. To assess potential synergies of co-administering sub-toxic amounts of nitrate and 3-nitro-1-propionate (NPA) on fermentation and Salmonella survivability with an alfalfa-based diet, ruminal microbes were cultured with additions of 8 or 16mM nitrate, 4 or 12mM NPA or their combinations...
January 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28107010/phase-equilibria-of-water-co2-and-water-n-alkane-mixtures-from-polarizable-models
#5
Hao Jiang, Ioannis George Economou, Athanassios Z Panagiotopoulos
Phase equilibria of water/CO2 and water/n-alkane mixtures over a range of temperatures and pressures were obtained from Monte Carlo simulations in the Gibbs ensemble. Three sets of Drude-type polarizable models for water, namely the BK3, GCP, and HBP models, were combined with a polarizable Gaussian charge CO2 (PGC) model to represent the water/CO2 mixture. The HBP water model describes hydrogen bonds between water and CO2 explicitly. All models underestimate CO2 solubility in water if standard combining rules are used for the dispersion interactions between water and CO2 ...
January 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28106070/key-sources-and-seasonal-dynamics-of-greenhouse-gas-fluxes-from-yak-grazing-systems-on-the-qinghai-tibetan-plateau
#6
Yang Liu, Caiyu Yan, Cory Matthew, Brennon Wood, Fujiang Hou
Greenhouse gas (GHG) emissions from livestock grazing systems are contributing to global warming. To examine the influence of yak grazing systems on GHG fluxes and relationships between GHG fluxes and environmental factors, we measured carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) fluxes over three key seasons in 2012 and 2013 from a range of potential sources, including: alpine meadows, dung patches, manure heaps and yak night pens, on the Qinghai-Tibetan Plateau. We also estimated the total annual global warming potential (GWP, CO2-equivalents) from family farm grazing yaks using our measured results and other published data...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28105595/bioelectrochemical-anaerobic-sewage-treatment-technology-for-arctic-communities
#7
Boris Tartakovsky, Yehuda Kleiner, Michelle-France Manuel
This study describes a novel wastewater treatment technology suitable for small remote northern communities. The technology is based on an enhanced biodegradation of organic carbon through a combination of anaerobic methanogenic and microbial electrochemical (bioelectrochemical) degradation processes leading to biomethane production. The microbial electrochemical degradation is achieved in a membraneless flow-through bioanode-biocathode setup operating at an applied voltage below the water electrolysis threshold...
January 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28104660/draft-genome-sequence-of-the-methane-oxidizing-bacterium-candidatus-methylomonas-sp-lwb-isolated-from-movile-cave
#8
Jason Stephenson, Deepak Kumaresan, Alexandra M Hillebrand-Voiculescu, Elliot Brooks, Andrew S Whiteley, J Colin Murrell
We describe the draft genome sequence of "Candidatus Methylomonas sp. LWB" isolated from Movile Cave microbial mat samples. The genome contains both the soluble and particular methane monooxygenase; however, one of the putative particulate methane monooxygenase gene clusters is ordered pmoABC rather than in the canonical gene arrangement of pmoCAB.
January 19, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28103021/efficient-removal-of-methane-over-the-cobalt-monoxide-doped-aupd-nanocatalysts
#9
Shaohua Xie, Yuxi Liu, Jiguang Deng, Simiao Zang, Zhenhua Zhang, Hamidreza Arandiyan, Hongxing Dai
Catalytic total oxidation of CH4 at a relatively low temperature over the precious metal (e.g., Pd-, Rh- or Pt)-based catalyst is believed to be a potential technology for the removal of greenhouse gas CH4. The traditional Pd-based catalysts for CH4 combustion reported in the literature tend to deactivate at high temperatures (> 600 °C), because the PdOx active phase is easily changed into aggregated metallic Pd nanoparticles (NPs). The high cost of Pd also limits its wide applications. In order to overcome such drawbacks, we herein design a novel pathway by introducing a certain amount of CoO to the supported Au-Pd alloy NPs to generate high-performance Au-Pd-xCoO/3DOM Co3O4 (x is the Co/Pd molar ratio) catalysts...
January 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28102897/controls-on-methane-occurrences-in-shallow-aquifers-overlying-the-haynesville-shale-gas-field-east-texas
#10
Jean-Philippe Nicot, Toti Larson, Roxana Darvari, Patrick Mickler, Michael Slotten, Jordan Aldridge, Kristine Uhlman, Ruth Costley
Understanding the source of dissolved methane in drinking-water aquifers is critical for assessing potential contributions from hydraulic fracturing in shale plays. Shallow groundwater in the Texas portion of the Haynesville Shale area (13,000 km(2) ) was sampled (70 samples) for methane and other dissolved light alkanes. Most samples were derived from the fresh water bearing Wilcox formations and show little methane except in a localized cluster of 12 water wells (17% of total) in a approximately 30 × 30 km(2) area in Southern Panola County with dissolved methane concentrations less than 10 mg/L...
January 19, 2017: Ground Water
https://www.readbyqxmd.com/read/28102423/synthesis-and-solution-stability-of-water-soluble-%C3%AE%C2%BA-2-n-%C3%AE%C2%BAo-bis-3-5-dimethylpyrazolyl-ethanol-manganese-i-tricarbonyl-bromide-corm-onn1
#11
Ralf Mede, Juliane Traber, Moritz Klein, Helmar Görls, Guido Gessner, Patrick Hoffmann, Michael Schmitt, Jürgen Popp, Stefan H Heinemann, Ute Neugebauer, Matthias Westerhausen
The reaction of (OC)5MnBr with bis(3,5-dimethyl-1-pyrazolyl)methane yields [{(Pz(Me2))2CH2}Mn(CO)3Br] (1). The use of tridentate heteroscorpionates such as bis(3,5-dimethyl-1-pyrazolyl)acetic acid and 2,2-bis(3,5-dimethyl-1-pyrazolyl)ethanol leads to the formation of mononuclear [(OC)3Mn{(Pz(Me2))2CH-CO2}] (2) and [(OC)3Mn{(Pz(Me2))2CH-CH2OH}]Br (3, CORM-ONN1). Salt-like photoCORM 3 is soluble in aqueous media up to a concentration of 200 μM, non-toxic up to an approx. 65 μM solution and releases all carbonyl ligands upon irradiation...
January 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28102407/introducing-tetramethylurea-as-a-new-methylene-precursor-a-microwave-assisted-rucl3-catalyzed-cross-dehydrogenative-coupling-approach-to-bis-indolyl-methanes
#12
Mohit L Deb, Paran J Borpatra, Prakash J Saikia, Pranjal K Baruah
Herein we report a microwave assisted Ru(iii)/TBHP-mediated reaction of indoles with tetramethylurea (TMU) synthesizing symmetrical as well as unsymmetrical bis(indolyl)methanes, where TMU acts as a methylenating agent. This is the first report where TMU is used as a methylene source. Moreover, the synthesis of unsymmetrical bis(indolyl)methanes by using a carbon precursor is also reported herein for the first time. Various substituted indoles are used for the reaction. The reaction is high yielding and takes a much shorter time to accomplish compared to the existing methods...
January 19, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28100018/conversion-of-amazon-rainforest-to-agriculture-alters-community-traits-of-methane-cycling-organisms
#13
Kyle M Meyer, Ann M Klein, Jorge L M Rodrigues, Klaus Nüsslein, Susannah G Tringe, Babur S Mirza, James M Tiedje, Brendan J M Bohannan
Land use change is one of the greatest environmental impacts worldwide, especially to tropical forests. The Amazon rainforest has been subject to particularly high rates of land use change, primarily to cattle pasture. A commonly observed response to cattle pasture establishment in the Amazon is the conversion of soil from a methane sink in rainforest, to a methane source in pasture. However, it is not known how the microorganisms that mediate methane flux are altered by land use change. Here we use the deepest metagenomic sequencing of Amazonian soil to date to investigate differences in methane-cycling microorganisms and their traits across rainforest and cattle pasture soils...
January 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28099805/the-importance-of-cannizzaro-type-reactions-during-electrocatalytic-reduction-of-carbon-dioxide
#14
Yuvraj Y Birdja, Marc T M Koper
A seemingly catalytic inactive electrode as boron doped diamond is found to be active for CO2 and CO reduction to formaldehyde and even methane. At very cathodic potentials formic acid and methanol are formed as well. However, these products are the result of base-catalyzed Cannizzaro-type disproportionation reactions. A local alkaline environment near the electrode surface, caused by the hydrogen evolution reaction, initiates aldehyde disproportionation promoted by hydroxide ions, which leads to the formation of the corresponding carboxylic acid and alcohol...
January 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28099024/surface-interactions-and-confinement-of-methane-a-high-pressure-magic-angle-spinning-nmr-and-computational-chemistry-study
#15
Salim Ok, David W Hoyt, Amity Andersen, Julie Sheets, Susan A Welch, David R Cole, Karl Todd Mueller, Nancy M Washton
Characterization and modeling of the molecular-level behavior of simple hydrocarbon gases, such as methane, in the presence of both nonporous and nano-porous mineral matrices allows for predictive understanding of important processes in engineered and natural systems. In this study, changes in local electromagnetic environments of the carbon atoms in methane under conditions of high pressure (up to 130 bar) and moderate temperature (up to 346 K) were observed with 13C magic-angle spinning (MAS) NMR spectroscopy while the methane gas was mixed with two model solid substrates: a fumed non-porous, 12 nm particle size silica and a mesoporous silica with 200 nm particle size and 4 nm average pore diameter...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28098983/redox-initiated-reactivity-of-dinuclear-%C3%AE-diketiminatoniobium-imido-complexes
#16
Benjamin M Kriegel, Lara C E Naested, Grégory Nocton, K V Lakshmi, Trevor D Lohrey, Robert G Bergman, John Arnold
High-valent dichloride and dimethylniobium complexes 1 and 2 bearing tert-butylimido and N,N'-bis(2,4,6-trimethylphenyl)-β-diketiminate (BDI(Ar)) ligands were prepared. The dimethyl complex reacted with dihydrogen to release methane and generate the hydride-bridged diniobium(IV) complex 3 in high yield. One-electron oxidation of 3 with silver salts resulted in the release of dihydrogen and conversion to a mixed-valent Nb(III)-Nb(IV) complex, 4, that displayed a frozen-solution X-band electron paramagnetic resonance signal consistent with a slight dissymmetry between the two Nb centers...
January 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28098207/using-13-c-isotopes-to-explore-denitrification-dependent-anaerobic-methane-oxidation-in-a-paddy-peatland
#17
Yao Shi, Zhongqiang Wang, Chunguang He, Xinyu Zhang, Lianxi Sheng, Xiaodong Ren
Peatlands are organic-matter-rich but nitrogen-limited natural systems, the carbon/nitrogen (C/N) status of which are subject to increasing exposure from long-term nitrate (NO3(-)) fertilizer inputs and atmospheric nitrogen (N) deposits. To manage and protect these unique environments, an improved understanding of denitrification-dependent anaerobic oxidation of methane (DAMO) in peatlands is needed. In this study, we used stable isotope measurements and incubation with NO3(-) additions to facilitate an investigation and comparison of the potential DAMO rates in a paddy-peatland that has been influenced by N fertilizer over 40 years and an undisturbed peatland in northeast China...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28096422/hydrogen-isotope-fractionation-in-methane-plasma
#18
François Robert, Sylvie Derenne, Guillaume Lombardi, Khaled Hassouni, Armelle Michau, Peter Reinhardt, Rémi Duhamel, Adriana Gonzalez, Kasia Biron
The hydrogen isotope ratio (D/H) is commonly used to reconstruct the chemical processes at the origin of water and organic compounds in the early solar system. On the one hand, the large enrichments in deuterium of the insoluble organic matter (IOM) isolated from the carbonaceous meteorites are interpreted as a heritage of the interstellar medium or resulting from ion-molecule reactions taking place in the diffuse part of the protosolar nebula. On the other hand, the molecular structure of this IOM suggests that organic radicals have played a central role in a gas-phase organosynthesis...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28094953/structure-sensitive-co2-electroreduction-to-hydrocarbons-on-ultrathin-five-fold-twinned-copper-nanowires
#19
Yifan Li, Fan Cui, Michael B Ross, Dohyung Kim, Yuchun Sun, Peidong Yang
Copper is uniquely active for the electrocatalytic reduction of carbon dioxide (CO2) to products beyond carbon monoxide, such as methane (CH4) and ethylene (C2H4). Therefore, understanding selectivity trends for CO2 electrocatalysis on copper surfaces is critical for developing more efficient catalysts for CO2 conversion to higher order products. Herein, we investigate the electrocatalytic activity of ultrathin (diameter ~20 nm) five-fold twinned copper nanowires (Cu NWs) for CO2 reduction. These Cu NW catalysts were found to exhibit high CH4 selectivity over other carbon products, reaching 55% Faradaic efficiency (F...
January 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28094773/methane-emissions-and-microbial-communities-as-influenced-by-dual-cropping-of-azolla-along-with-early-rice
#20
Jingna Liu, Heshui Xu, Ying Jiang, Kai Zhang, Yuegao Hu, Zhaohai Zeng
Azolla caroliniana Willd. is widely used as a green manure accompanying rice, but its ecological importance remains unclear, except for its ability to fix nitrogen in association with cyanobacteria. To investigate the impacts of Azolla cultivation on methane emissions and environmental variables in paddy fields, we performed this study on the plain of Dongting Lake, China, in 2014. The results showed that the dual cropping of Azolla significantly suppressed the methane emissions from paddies, likely due to the increase in redox potential in the root region and dissolved oxygen concentration at the soil-water interface...
January 17, 2017: Scientific Reports
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