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| Registros recuperados: 13 | |
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| Zhang,Nan; Peng,Huijuan; Li,Yong; Yang,Wenxiu; Zou,Yuneng; Duan,Huiguo. |
| ABSTRACT Anaerobic digestion is important for the management of livestock manure with high ammonia level. Although ammonia effects on anaerobic digestion have been comprehensively studied, the molecular mechanism underlying ammonia inhibition still remains elusive. In this study, based on metatranscriptomic analysis, the transcriptional profile of microbial community in anaerobic digestion under low (1500 mg L-1) and high NH4 + (5000 mg L-1) concentrations, respectively, were revealed. The results showed that high NH4 + concentrations significantly inhibited methane production but facilitated the accumulations of volatile fatty acids. The expression of methanogenic pathway was significantly inhibited by high NH4 + concentration but most of the other... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anaerobic digestion; Ammonia; Pathway; Gene expression; Methanogenesis. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000400770 |
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| Ballester,Maria Victória Ramos; Santos,José Eduardo dos. |
| Analysis of the distribution of biogenic gases in the floodplain of the Mogi-Guaçu River (São Paulo, Brazil) enabled the establishment of a "redox hierarchy", in which the main channel was the most oxidizing environment, followed by Diogo Lake, with Infernão Lake having the most reducing conditions of the subsystems evaluated. Diogo Lake exported about 853.4 g C.m-2.year-1, of which, 14.6% was generated from methanogenesis and 36.7% by aerobic respiration. For Infernão Lake, these values were 2016 g C.m-2.year-1, 1.8 % and 41.5 %, respectively. Carbon export by these systems was predominantly in the form of CO2, which was responsible for the release of 728.78 g C.m-2.year-1 at Diogo Lake and 1979.72 g C.m-2. year-1 at Infernão Lake. Such patterns may... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biogenic gases; Methanogenesis; Aerobic respiration; CO2 production. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000200006 |
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| Roussel, Erwan; Cragg, Barry A.; Webster, Gordon; Sass, Henrik; Tang, Xiaohong; Williams, Angharad S.; Gorra, Roberta; Weightman, Andrew J.; Parkes, R. John. |
| The impact of temperature (0 - 80°C) on anaerobic biogeochemical processes and prokaryotic communities in marine sediments (tidal flat) was investigated in slurries for up to 100 days. Temperature had a non-linear effect on biogeochemistry and prokaryotes with rapid changes over small temperature intervals. Some activities (e.g. methanogenesis) had multiple “windows” within a large temperature range (~10 - 80°C). Others, including acetate oxidation, had maximum activities within a temperature zone, which varied with electron acceptor (metal oxide [up to ~34°C] and sulphate [up to ~50°C]). Substrates for sulphate reduction changed from predominantly acetate below, and H2 above, a 43°C critical temperature; along with changes in activation energies and types... |
| Tipo: Text |
Palavras-chave: Sediment; Temperature; Anaerobic processes; Chemoorganotrophic; Chemolithotrophic; Mineralisation; Sulphate reduction; Methanogenesis; Acetogenesis. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00273/38464/36883.pdf |
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| Moscôso,Janielly Silva Costa; Silva,Leandro Souza da; Pujol,Stefen Barbosa; Giacomini,Sandro José; Severo,Fabiane Figueiredo; Marzari,Laura Brondani; Molin,Gustavo Dal. |
| ABSTRACT Methane (CH4) is the second major greenhouse gas after CO2, exerting a significant influence on the climate and the chemistry of the atmosphere. In lowland soil, acetate and H2/CO2 are the most important precursors of CH4 and formed from organic matter fermentation in an anaerobic environment, giving rise to short-chain organic acids (ethanoic, propanoic, and butanoic), depending on the type of crop residue and the soil management system. Ethanoic acid can be directly converted to CH4 by methanogenic microorganisms, but propanoic and butanoic acids must be converted to acetate before being converted to CH4. This study aimed to quantify, in isolation, the dynamics and CH4 emission potential of the three short-chain organic acids found in flooded... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ethanoic acid; Butanoic acid; Propanoic acid; Methanogenesis; Irrigated rice. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100412 |
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| Lazar, Cassandre; Parkes, R. John; Cragg, Barry A.; L'Haridon, Stephane; Toffin, Laurent. |
| Marine mud volcanoes are geological structures emitting large amounts of methane from their active centres. The Amsterdam mud volcano (AMV), located in the Anaximander Mountains south of Turkey, is characterized by intense active methane seepage produced in part by methanogens. To date, information about the diversity or the metabolic pathways used by the methanogens in active centres of marine mud volcanoes is limited. 14C-radiotracer measurements showed that methylamines/methanol, H2/CO2 and acetate were used for methanogenesis in the AMV. Methylotrophic methanogenesis was measured all along the sediment core, Methanosarcinales affiliated sequences were detected using archaeal 16S PCR-DGGE and mcrA gene libraries, and enrichments of methanogens showed... |
| Tipo: Text |
Palavras-chave: Methanogenesis; McrA; Archaea. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00087/19795/17538.pdf |
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| Qiao,Junyi; Tan,Zhiliang; Wang,Min. |
| Enteric methane (CH4) emissions in ruminants have attracted considerable attention due to their impact on greenhouse gases and the contribution of agricultural practices to global warming. Over the last two decades, a number of approaches have been adopted to mitigate CH4 emissions. However, the mechanisms of methanogenesis have still not been fully defined. According to the genome sequences of M. ruminantium in the rumen and of M. AbM4 in the abomasum, the pathways of carbon dioxide (CO2) reduction and formate oxidation to CH4 have now been authenticated in ruminants. Furthermore, in the light of species or genera description of methanogens, the precursors of methanogenesis discovered in the rumen and research advances in related subjects, pathways of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Methanogenesis; Carbon dioxide; Formate; Acetate; Methanol. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500013 |
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| Chen, Nai-chen; Yang, Tsanyao Frank; Hong, Wei-li; Chen, Hsuan-wen; Chen, Hsiao-chi; Hu, Ching-yi; Huang, Yu-chun; Lin, Saulwood; Lin, Li-hung; Su, Chih-chieh; Liao, Wei-zhi; Sun, Chih-hsien; Wang, Pei-ling; Yang, Tao; Jiang, Shao-yong; Liu, Char-shine; Wang, Yunshuen; Chung, San-hsiung. |
| To systematically quantify the production, consumption and migration of methane along a continental margin, 210 sediment cores were collected from offshore southwestern Taiwan and analyzed for their gas and aqueous geochemistry. These data, combined with published results, were used to calculate the diffusive methane fluxes across different geochemical transitions and to develop scenarios of mass balance to constrain deep microbial and thermogenic methane production rates within the accretionary prism. The results showed that methane diffusive fluxes ranged from 2.71 × 10−3 to 2.78 × 10−1 and from ‒1.88 × 10−1 to 3.97 mmol m−2 d−1 at the sulfate-methane-transition-zone (SMTZ) and sediment-seawater interfaces, respectively. High methane fluxes tend to be... |
| Tipo: Text |
Palavras-chave: Thermal maturation; Methanogenesis; Anaerobic methanotrophy; Methane efflux; Subduction; Taiwan. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00393/50412/51132.pdf |
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| Moscôso,Janielly Silva Costa; Silva,Leandro Souza da; Tarouco,Camila Peligrinotti; Nicoloso,Fernando Teixeira; Severo,Fabiane Figueiredo; Aita,Natália Tobin; Prigol,Luís Henrique Ferreira. |
| ABSTRACT: Rhizospheric carbon resulting from root exudation is one of the substrates used by the soil microbiota, and reflects methane (CH4) emissions in anoxic environments such as irrigated rice cultivation. With the increase of the photosynthetic capacity of the plant in the reproductive period, there is greater accumulation of biomass which, in turn, increases the rate of root exudation. However, genotypic variations in the physiological aspects of rice plants may be related to the amount of root exudates. Ten cultivars of irrigated rice were evaluated for the exudation rate of total organic carbon (EXRToc), shoot dry matter (SDM), and physiological variables related to photosynthesis during the full flowering (blooming) period. Two experiments were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Photosynthesis; Exudates; Methanogenesis. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001200250 |
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| Registros recuperados: 13 | |
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