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Xiao Li, Cuiping Zeng, Yaobin Lu, Guangli Liu, Haiping Luo, Renduo Zhang
The aim of this study was to investigate the development of cathodic biofilm and its effect on methane production in a single-chamber microbial electrolysis cell (MEC). The MEC with 1 g/L acetate was successfully operated within 31 cycles (∼2400 h). The maximum methane production rate and average current capture efficiency in the MEC reached 93 L/m3 ·d and 82%, respectively. Distinct stratification of Methanobacteriaceae within cathodic biofilm was observed after 9 cycles of operation. The relative abundance of Methanobacteriaceae in the microbial community increased from 45...
December 3, 2018: Bioresource Technology
J D Marin-Batista, J A Villamil, J J Rodriguez, A F Mohedano, M A de la Rubia
The potential of hydrothermal carbonization (HTC) as a novel choice for treating microalgal biomass (MAB) was assessed. The hydrochar obtained at 210 °C had a carbon content and a higher heating value (HHV) 1.09 and 1.1 times greater, respectively, than that of the feedstock. Also, washing the hydrochar with HCl efficiently removed ash and increased its carbon content 1.40-fold. Energy recovery in the liquid fraction from the hydrothermal treatment (LF) by anaerobic digestion (AD) allowed methane yields of 188-356 mL STP CH4 g-1 VSadded , to be obtained...
December 4, 2018: Bioresource Technology
Tingting Li, Hailing Li, Qing Zhang, Zhenfeng Ma, Lingfei Yu, Yanyu Lu, Zhenguo Niu, Wenjuan Sun, Jia Liu
The alpine wetlands on the Tibetan Plateau (TP) are ecosystems vulnerable to global climate change. It has been recognized that future climate change may have a significant impact on methane (CH4 ) emissions from the plateau, while less attention has been paid to predicting temporal and spatial variations in CH4 emissions from TP natural wetlands. In this study, we used an integrated model framework based on the CH4MODwetland , TOPMODEL and TEM models to predict CH4 emissions from potential natural wetlands on the TP under IPCC AR5 scenarios from 2006 to 2100...
November 28, 2018: Science of the Total Environment
Chungseok Choi, Tao Cheng, Michelle Flores Espinosa, Huilong Fei, Xiangfeng Duan, William A Goddard, Yu Huang
The electrochemical carbon dioxide reduction reaction (CO2 RR) presents a viable approach to recycle CO2 gas into low carbon fuels. Thus, the development of highly active catalysts at low overpotential is desired for this reaction. Herein, a high-yield synthesis of unique star decahedron Cu nanoparticles (SD-Cu NPs) electrocatalysts, displaying twin boundaries (TBs) and multiple stacking faults, which lead to low overpotentials for methane (CH4 ) and high efficiency for ethylene (C2 H4 ) production, is reported...
December 14, 2018: Advanced Materials
Sergio Bordel, Elisa Rodríguez, Raúl Muñoz
Polyhydroxyalkanoates (PHAs) are biodegradable plastics that can be produced by some methanotrophic organisms such as those of the genus Methylocystis. This allows the conversion of a detrimental greenhouse gas into an environmentally friendly high added-value bioproduct. This study presents the genome sequence of Methylocystis hirsuta CSC1 (a high yield PHB producer). The genome comprises 4,213,043 bp in 4 contigs, with the largest contig being 3,776,027 bp long. Two of the other contigs are likely to correspond to large size plasmids...
December 12, 2018: MicrobiologyOpen
Koshiro Nakamura, Akihito Okuda, Kiyotaka Ohta, Hitoshi Matsubara, Kazu Okumura, Kana Yamamoto, Ryosuke Itagaki, Satoshi Suganuma, Etsushi Tsuji, Naonobu Katada
Cobalt-loaded MFI zeolite showed distinct activity for direct methylation of benzene with methane into toluene. High activity was found at around 0.6 of Co/Al molar ratio. Incorporation of carbon from methane into the methyl group of toluene was confirmed with isotope tracer experiments and mass spectroscopy. Ammonia infrared-mass spectroscopy temperature-programmed desorption, transmission electron microscopy, X-ray absorption near edge spectroscopy and extended X-ray absorption fine structure indicated that Lewis acidic divalent (+II of oxidation state) Co species mono-atomically dispersed on the ion exchange site of MFI zeolite was the active species...
September 7, 2018: ChemCatChem
Jinqiang Huang, Yongjuan Li
BACKGROUND: Tibetan sheep (TS) and Gansu Alpine Finewool sheep (GS) are both important plateau sheep raised and fed on the harsh Qinghai-Tibetan Plateau, China. Rumen methanogen and protozoal communities of plateau sheep are affected by their hosts and living environments, and play important roles in ruminant nutrition and greenhouse gas production. However, the characteristics, differences, and associations of these communities remain largely uncharacterized. RESULTS: The rumen methanogen and protozoal communities of plateau sheep were investigated by 16S/18S rRNA gene clone libraries...
December 13, 2018: BMC Microbiology
Doha Elalami, Hélène Carrère, Karima Abdelouahdi, Abdallah Oukarroum, Driss Dhiba, Mohamed Arji, Abdellatif Barakat
This experimental work aims at investigating the effects of milling; sieving; and electrostatic separation on the biochemical methane potential of two olive pomaces from traditional olive oil extraction (M) and from a three-phase system (T). Sieving proved to be efficient for increasing the soluble chemical oxygen demand in the smallest fractions of the sieve of both M (62%) and T (78%) samples. The positive fraction following electrostatic separation also enhanced chemical oxygen demand (COD) solubilisation by 94%, in comparison to sample T milled at 4 mm...
December 12, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Pratap Pragna, Surinder S Chauhan, Veerasamy Sejian, Brian J Leury, Frank R Dunshea
The ability of an animal to cope and adapt itself to the changing climate virtually depends on the function of rumen and rumen inhabitants such as bacteria, protozoa, fungi, virus and archaea. Elevated ambient temperature during the summer months can have a significant influence on the basic physiology of the rumen, thereby affecting the nutritional status of the animals. Rumen volatile fatty acid (VFA) production decreases under conditions of extreme heat. Growing recent evidence suggests there are genetic variations among breeds of goats in the impact of heat stress on rumen fermentation pattern and VFA production...
December 7, 2018: Animals: An Open Access Journal From MDPI
Tony van der Weerden, Pierre Beukes, Cecile de Klein, Kathryn Hutchinson, Lydia Farrell, Tinke Stormink, Alvaro Romera, Dawn Dalley, Ross Monaghan, David Chapman, Kevin Macdonald, Robyn Dynes
An important challenge facing the New Zealand (NZ) dairy industry is development of production systems that can maintain or increase production and profitability, while reducing impacts on receiving environments including water and air. Using research 'farmlets' in Waikato, Canterbury, and Otago (32⁻200 animals per herd), we assessed if system changes aimed at reducing nitrate leaching can also reduce total greenhouse gas (GHG) emissions (methane and nitrous oxide) and emissions intensity (kg GHG per unit of product) by comparing current and potential 'improved' dairy systems...
December 7, 2018: Animals: An Open Access Journal From MDPI
Fan Yang, Yun Li, Yuhua Han, Wentao Qian, Guoxue Li, Wenhai Luo
This study investigated the performance of mature compost to mitigate gaseous emissions during kitchen waste composting. Cornstalk was mixed with kitchen waste at a ratio of 3:17 (wet weight) as the bulking agent. Mature compost (10% of raw composting materials on the wet weight basis) was mixed into or covered on the composting pile. A control treatment without any addition of mature compost was conducted for comparison. Results show that mature compost did not significantly affect the composting process. Nevertheless, gaseous emissions during kitchen waste composting were considerably reduced with the addition of mature compost...
December 4, 2018: Science of the Total Environment
Ilya R Akberdin, David A Collins, Richard Hamilton, Dmitry Y Oshchepkov, Anil K Shukla, Carrie D Nicora, Ernesto S Nakayasu, Joshua N Adkins, Marina G Kalyuzhnaya
Background: Rare Earth Elements (REEs) control methanol utilization in both methane- and methanol-utilizing microbes. It has been established that the addition of REEs leads to the transcriptional repression of MxaFI-MeDH [a two-subunit methanol dehydrogenase (MeDH), calcium-dependent] and the activation of XoxF-MeDH (a one-subunit MeDH, lanthanum-dependent). Both enzymes are pyrroquinoline quinone-dependent alcohol dehydrogenases and show significant homology; however, they display different kinetic properties and substrate specificities...
2018: Frontiers in Microbiology
Marcin Rybicki, Joachim Sauer
A hybrid of high level and low level quantum mechanics (QM) methods has been employed to predict intrinsic and apparent energy barriers for the direct proton exchange mechanism of methane, ethane, propane, n-butane, and i-butane on Brønsted sites of H-MFI. The specific hybrid MP2:PBE+D2 + ΔCC implementation used is known to yield the so-called "chemical accuracy" (±4 kJ/mol). Whereas the apparent enthalpy barriers decrease with increasing C number from 104 to 63 kJ/mol, in line with the decreasing heat of adsorption, the intrinsic enthalpy barriers are constant within 124-127 kJ/mol at 500 K...
December 12, 2018: Journal of the American Chemical Society
Caiqin Wang, Weilong Qiao, Hui Chen, Xiangyang Xu, Liang Zhu
Conductive iron oxides (CIO) have been proved recently to facilitate the anaerobic microbial syntrophy based on the direct interspecies electron transfer (DIET) in batch experiments. However, the effect of CIO was always insignificant in anaerobic digestion (AD) reactor especially when the DIET-based syntrophic partners were absent. In this study, the effect of magnetite on performance of AD system with sucrose as a sole carbon source was investigated, but limited enhancement was achieved during the first 36-day operation...
December 12, 2018: Applied Microbiology and Biotechnology
Chansotheary Dang, Ember M Morrissey, Scott C Neubauer, Rima B Franklin
Sea level rise and changes in precipitation can cause saltwater intrusion into historically freshwater wetlands, leading to shifts in microbial metabolism that alter greenhouse gas emissions and soil carbon sequestration. Saltwater intrusion modifies soil physicochemistry and can immediately affect microbial metabolism, but further alterations to biogeochemical processing can occur over time as microbial communities adapt to the changed environmental conditions. To assess temporal changes in microbial community composition and biogeochemical activity due to saltwater intrusion, soil cores were transplanted from a tidal freshwater marsh to a downstream mesohaline marsh and periodically sampled over 1 year...
December 9, 2018: Global Change Biology
Babak Darabighane, Abdelfattah Zeidan Mohamed Salem, Farzad Mirzaei Aghjehgheshlagh, Ali Mahdavi, Abolfazl Zarei, Mona Mohamed Mohamed Yasseen Elghandour, Secundino López
The objective of the present study is to examine the effect of yeast (Saccharomyces cerevisiae) on reduction of methane (CH4 ) production in dairy and beef cattle using meta-analytic methods. After compilation of relevant scientific publications available from the literature between 1990 and 2016, and applying exclusion and inclusion criteria, meta-analyses of data from dairy and beef cattle were applied for the pooled dataset or for each animal category (dairy or beef). The results of meta-analysis of all three datasets (all cattle, dairy cattle, or beef cattle) suggested that effect size of yeast either on daily CH4 production or on CH4 production per dry matter intake (CH4 /DMI) was not significant...
December 8, 2018: Environmental Science and Pollution Research International
Rachel L Harris, Maggie C Y Lau, Andreia Cadar, Douglas H Bartlett, Errol Cason, Esta van Heerden, Tullis C Onstott
Metagenomic sequencing of fracture fluid from South Africa recovered a nearly complete " Candidatus Bathyarchaeota" archaeon genome. The metagenome-assembled genome of BE326-BA-RLH contains genes involved in methane metabolism and dissimilatory nitrate reduction. This study presents the first genomic evidence for potential anaerobic methane oxidation in the phylum " Ca. Bathyarchaeota."
November 2018: Microbiology resource announcements
Thanh-Truc Hoang Nguyen, Xuan-Trang Thi Nguyen, Chinh Quoc Nguyen, Phuong Hoang Tran
Four Cu-Mg-Al mixed metal oxides (MMO) were synthesized through the calcination of layered double hydroxides (LDHs). These catalysts were fully characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Brunauer-Emmett-Teller surface area (BET), and inductively coupled plasma optical emission spectrometer (ICP-OES). The catalytic efficiency of porous metal oxides derived from LDHs has been tested successfully for the synthesis of bis(indolyl)methanes via the Friedel-Crafts alkylation of indoles with aromatic aldehydes under solvent-free microwave irradiation...
November 2018: Heliyon
Binghan Wang, Shanshan Huang, Liangmao Zhang, Jianwei Zhao, Guanglong Liu, Yumei Hua, Wenbing Zhou, Duanwei Zhu
Background: The nitrite-dependent anaerobic methane oxidation (N-DAMO) pathway, which plays an important role in carbon and nitrogen cycling in aquatic ecosystems, is mediated by "Candidatus Methylomirabilis oxyfera " ( M. oxyfera ) of the NC10 phylum. M. oxyfera -like bacteria are widespread in nature, however, the presence, spatial heterogeneity and genetic diversity of M. oxyfera in the rhizosphere of aquatic plants has not been widely reported. Method: In order to simulate the rhizosphere microenvironment of submerged plants, Potamogeton crispus was cultivated using the rhizobox approach...
2018: PeerJ
Yanfen Zhang, Anzhou Ma, Wenzong Liu, Zhihui Bai, Xuliang Zhuang, Guoqiang Zhuang
Recently, a new oxygenic pathway has been proposed based on the disproportionation of NO with putative NO dismutase (Nod). In addition to a new process in nitrogen cycling, this process provides ecological advantages for the degradation of substrates in anaerobic conditions, which is of great significance for wastewater treatment. However, the Nod distribution in aquatic environments is rarely investigated. In this study, we obtained the nod genes with an abundance of 2.38 ± 0.96 × 105 copies per gram of dry soil from the Zoige wetland and aligned the molecular characteristics in the corresponding Nod sequences...
2018: Archaea: An International Microbiological Journal
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