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Journal articles on the topic 'H2- producing conditions'

Author: Grafiati

Published: 10 March 2023

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1

Conrad, R., B. Schink, and T. J. Phelps. "Thermodynamics of H2-consuming and H2-producing metabolic reactions in diverse methanogenic environments under in situ conditions." FEMS Microbiology Letters 38, no. 6 (1986): 353–60. http://dx.doi.org/10.1111/j.1574-6968.1986.tb01748.x.

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2

Strąpoć, Dariusz, Flynn W. Picardal, Courtney Turich, et al. "Methane-Producing Microbial Community in a Coal Bed of the Illinois Basin." Applied and Environmental Microbiology 74, no. 8 (2008): 2424–32. http://dx.doi.org/10.1128/aem.02341-07.

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ABSTRACT A series of molecular and geochemical studies were performed to study microbial, coal bed methane formation in the eastern Illinois Basin. Results suggest that organic matter is biodegraded to simple molecules, such as H2 and CO2, which fuel methanogenesis and the generation of large coal bed methane reserves. Small-subunit rRNA analysis of both the in situ microbial community and highly purified, methanogenic enrichments indicated that Methanocorpusculum is the dominant genus. Additionally, we characterized this methanogenic microorganism using scanning electron microscopy and distri

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3

Sakai, Sanae, Hiroyuki Imachi, Yuji Sekiguchi, Akiyoshi Ohashi, Hideki Harada, and Yoichi Kamagata. "Isolation of Key Methanogens for Global Methane Emission from Rice Paddy Fields: a Novel Isolate Affiliated with the Clone Cluster Rice Cluster I." Applied and Environmental Microbiology 73, no. 13 (2007): 4326–31. http://dx.doi.org/10.1128/aem.03008-06.

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ABSTRACT Despite the fact that rice paddy fields (RPFs) are contributing 10 to 25% of global methane emissions, the organisms responsible for methane production in RPFs have remained uncultivated and thus uncharacterized. Here we report the isolation of a methanogen (strain SANAE) belonging to an abundant and ubiquitous group of methanogens called rice cluster I (RC-I) previously identified as an ecologically important microbial component via culture-independent analyses. To enrich the RC-I methanogens from rice paddy samples, we attempted to mimic the in situ conditions of RC-I on the basis o

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4

Posewitz, M. C., P. W. King, S. L. Smolinski, et al. "Identification of genes required for hydrogenase activity in Chlamydomonas reinhardtii." Biochemical Society Transactions 33, no. 1 (2005): 102–4. http://dx.doi.org/10.1042/bst0330102.

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The eukaryotic green alga, Chlamydomonas reinhardtii, produces H2 under anaerobic conditions, in a reaction catalysed by an [FeFe]-hydrogenase. To identify genes that influence H2 production in C. reinhardtii, a library of 6000 colonies on agar plates was screened with sensitive chemochromic H2-sensor films for clones defective in H2 production. Two mutants of particular interest were fully characterized. One mutant, hydEF-1, is unable to assemble an active [FeFe]-hydrogenase. This is the first reported C. reinhardtii mutant that is not capable of producing any H2. The second mutant, sta7-10,

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5

Pham, Hanh Thi Kim, Anh Thi Ngoc To, and Anh Duong Tam Nguyen. "Collection of some microbial consortia producing hydrogen from anaerobic wastes." Science and Technology Development Journal 16, no. 1 (2013): 51–59. http://dx.doi.org/10.32508/stdj.v16i1.1396.

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The preparation of hydrogen-producing microbial consortia from three anaerobic digested sludges were carried out by four different pretreatment methods (heat – shock, acid, base and aeration treatment) as well as untreatment. The obtained microbial seeds have been estimated for their stability in fermentative hydrogen production by three consecutive batch fermentations under the same conditions of pH 6.5, room temperature and cultivation time and also investigated the H2 fermentation from different concentrations of glucose and xylose. Three microbial seeds have the most effective H2 productio

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6

Subramanian, Venkataramanan, Alexandra Dubini, David P. Astling, et al. "ProfilingChlamydomonasMetabolism under Dark, Anoxic H2-Producing Conditions Using a Combined Proteomic, Transcriptomic, and Metabolomic Approach." Journal of Proteome Research 13, no. 12 (2014): 5431–51. http://dx.doi.org/10.1021/pr500342j.

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7

Bakonyi, Péter, Nándor Nemestóthy, and Katalin Bélafi-Bakó. "Comparative Study of VariousE. coliStrains for Biohydrogen Production Applying Response Surface Methodology." Scientific World Journal 2012 (2012): 1–7. http://dx.doi.org/10.1100/2012/819793.

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The proper strategy to establish efficient hydrogen-producing biosystems is the biochemical, physiological characterization of hydrogen-producing microbes followed by metabolic engineering in order to give extraordinary properties to the strains and, finally, bioprocess optimization to realize enhanced hydrogen fermentation capability. In present paper, it was aimed to show the utility both of strain engineering and process optimization through a comparative study of wild-type and genetically modifiedE. colistrains, where the effect of two major operational factors (substrate concentration and

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8

Wang, Yuan Yuan, Jian Bo Wang, Cheng Xiao Hu, and Yan Lin Zhang. "Effect of Various Pretreatment Methods of Inoculum on Biohydrogen Production." Advanced Materials Research 152-153 (October 2010): 902–8. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.902.

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Influence of different pretreatment methods applied on anaerobic mixed inoculum was evaluated for selectively enriching the hydrogen (H2) producing mixed culture using glucose as substrate. The cumulative H2 yield and H2 production rate were found to be dependent on the type of pretreatment procedure adopted on the parent inoculum. They could be increased by appropriate pretreatment methods, including use of heat, alkaline or acidic conditions. Along with the processing temperature and time of heat pretreatment and alkaline of alkali pretreatment increasing, the H2 yield increased and then dec

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9

Hartmann, L., D. Taras, B. Kamlage, and M. Blaut. "A new technique to determine hydrogen excreted by gnotobiotic rats." Laboratory Animals 34, no. 2 (2000): 162–70. http://dx.doi.org/10.1258/002367700780457617.

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A new system, that allowed the monitoring of hydrogen (H2) excretion by gnotobiotic rats without affecting their defined microbial status, was developed. The system consists of an isolator containing a chamber for an experimental animal, and a life-support system (LSS). with a sampling port outside the isolator connected to it. H2 accumulation in the system was measured by analysing a defined volume of gas after removal. H2 concentrations were determined with an electrochemical cell or by gas chromatography. To validate this technique, H2 excretion by germ-free (GF) and mono-associated rats fe

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10

Ipkawati, Nelda, Saktioto Saktioto, and Saktioto Saktioto. "PENENTUAN DENSITAS PLASMA HIDROGEN NONTERMAL PADA TEKANAN RENDAH." Komunikasi Fisika Indonesia 16, no. 1 (2019): 29. http://dx.doi.org/10.31258/jkfi.16.1.29-34.

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Before producing hydrogen plasma low pressure in experiment, it is necessary to know the density equilibrium process through a simulation. Hydrogen species densities of non-thermal plasma at low pressure is simulated using chemical kinetik model by Runge Kutta method. This simulation carried out to determine the equilibrium process of densities and reaction rates of hydrogen species in achieving equilibrium conditions. The equation used time-dependent continuity equation and Arrhenius form. The hydrogen species consist of electrons, H, H2, H+ and H2+. The results of show that electron density,

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11

Moreno, Mario, Arturo Ponce, Arturo Galindo, et al. "Comparative Study on the Quality of Microcrystalline and Epitaxial Silicon Films Produced by PECVD Using Identical SiF4 Based Process Conditions." Materials 14, no. 22 (2021): 6947. http://dx.doi.org/10.3390/ma14226947.

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Hydrogenated microcrystalline silicon (µc-Si:H) and epitaxial silicon (epi-Si) films have been produced from SiF4, H2 and Ar mixtures by plasma enhanced chemical vapor deposition (PECVD) at 200 °C. Here, both films were produced using identical deposition conditions, to determine if the conditions for producing µc-Si with the largest crystalline fraction (XC), will also result in epi-Si films that encompass the best quality and largest crystalline silicon (c-Si) fraction. Both characteristics are of importance for the development of thin film transistors (TFTs), thin film solar cells and novel

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12

Tao, Y., D. Liu, X. Yan, Z. Zhou, J. K. Lee, and C. Yang. "Network Identification and Flux Quantification of Glucose Metabolism in Rhodobacter sphaeroides under Photoheterotrophic H2-Producing Conditions." Journal of Bacteriology 194, no. 2 (2011): 274–83. http://dx.doi.org/10.1128/jb.05624-11.

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13

Ponce, Angel L. G., and Jose J. Fripiat. "Interaction between atomic hydrogen and YBa2Cu3O7." Journal of Materials Research 7, no. 11 (1992): 2908–15. http://dx.doi.org/10.1557/jmr.1992.2908.

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Atomic hydrogen obtained from dissociative chemisorption of molecular H2 on Pt particles deposited on the surface of YBa2Cu3O7 reacts with the oxide in producing O vacancies and intercalating H at 82 °C under a H2 pressure of about 400 Torr. An induction period which extends over 1 h is observed as long as the concentration in O vacancies is below 0.1. Above this approximate limit the reaction proceeds quickly until about 1 mol H2 has been consumed. It then slows down progressively, but it is not completed even after 27 h of reaction and ∼1.4 H2 consumed, under these experimental conditions. T

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14

Hu, Jin-Shuang, Yan-Yan Huang, Jia-Hua Kuang, Jia-Jia Yu, Qin-Yu Zhou, and Dong-Mei Liu. "Streptococcus thermophiles DMST-H2 Promotes Recovery in Mice with Antibiotic-Associated Diarrhea." Microorganisms 8, no. 11 (2020): 1650. http://dx.doi.org/10.3390/microorganisms8111650.

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Antibiotic-associated diarrhea (AAD) is the most common side effect of antibiotics and is routinely treated with probiotics in clinical. Streptococcus thermophiles, extensively utilized for producing dairy foods, has recently been regarded as a new promising probiotic candidate. In this study, the efficacy of Streptococcus thermophiles DMST-H2 (DMST-H2) for AAD treatment in mice was investigated. DMST-H2 was isolated from Chinese traditional yogurt, proved to be non-toxic, and presented tolerance against simulated gastrointestinal conditions in vitro. Additionally, genomic analysis revealed th

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15

Kubo, Miwako, Ryota Mano, Misako Kojima та ін. "Hydrogen Selective SiCH Inorganic–Organic Hybrid/γ-Al2O3 Composite Membranes". Membranes 10, № 10 (2020): 258. http://dx.doi.org/10.3390/membranes10100258.

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Solar hydrogen production via the photoelectrochemical water-splitting reaction is attractive as one of the environmental-friendly approaches for producing H2. Since the reaction simultaneously generates H2 and O2, this method requires immediate H2 recovery from the syngas including O2 under high-humidity conditions around 50 °C. In this study, a supported mesoporous γ-Al2O3 membrane was modified with allyl-hydrido-polycarbosilane as a preceramic polymer and subsequently heat-treated in Ar to deliver a ternary SiCH organic–inorganic hybrid/γ-Al2O3 composite membrane. Relations between the poly

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16

Oyama, S. Ted, Haruki Aono, Atsushi Takagaki, Takashi Sugawara, and Ryuji Kikuchi. "Synthesis of Silica Membranes by Chemical Vapor Deposition Using a Dimethyldimethoxysilane Precursor." Membranes 10, no. 3 (2020): 50. http://dx.doi.org/10.3390/membranes10030050.

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Silica-based membranes prepared by chemical vapor deposition of tetraethylorthosilicate (TEOS) on γ-alumina overlayers are known to be effective for hydrogen separation and are attractive for membrane reactor applications for hydrogen-producing reactions. In this study, the synthesis of the membranes was improved by simplifying the deposition of the intermediate γ-alumina layers and by using the precursor, dimethyldimethoxysilane (DMDMOS). In the placement of the γ-alumina layers, earlier work in our laboratory employed four to five dipping-calcining cycles of boehmite sol precursors to produc

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17

Fakhroueian, Zahra, N. Afroukhteh Langroudi, Pouriya Esmaeilzadeh, et al. "The Consideration of Splendid Increasing Trend of Green Fuel H₂ Production with the Help of Nanofine Materials." Defect and Diffusion Forum 297-301 (April 2010): 351–58. http://dx.doi.org/10.4028/www.scientific.net/ddf.297-301.351.

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Processes to transform natural gas into hydrogen or synthesis of gas (H2+CO) have been extensively studied in recent decades. H2 can be used in fuel cells as a power source and syngas may be converted into hydrocarbons via the Fischer-Tropsch synthesis. An attractive alternative process for syngas production is the partial oxidation of methane (POM). The objective of this study is to find effective conditions in using of nanofine particles for producing high activity and novel nanocatalysts to syngas, especially selectivity green fuel H2 gas as a power source. Therefore, we could produce 98.6%

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18

Sekoai, Patrick T., Viren Chunilall, Bruce Sithole, et al. "Elucidating the Role of Biofilm-Forming Microbial Communities in Fermentative Biohydrogen Process: An Overview." Microorganisms 10, no. 10 (2022): 1924. http://dx.doi.org/10.3390/microorganisms10101924.

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Amongst the biofuels described in the literature, biohydrogen has gained heightened attention over the past decade due to its remarkable properties. Biohydrogen is a renewable form of H2 that can be produced under ambient conditions and at a low cost from biomass residues. Innovative approaches are continuously being applied to overcome the low process yields and pave the way for its scalability. Since the process primarily depends on the biohydrogen-producing bacteria, there is a need to acquire in-depth knowledge about the ecology of the various assemblages participating in the process, esta

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19

Colleran, S., and S. Pender. "Mesophilic and thermophilic anaerobic digestion of sulphate-containing wastewaters." Water Science and Technology 45, no. 10 (2002): 231–35. http://dx.doi.org/10.2166/wst.2002.0339.

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The effect of sulphate at an influent chemical oxygen demand (COD):sulphate ratio of 4 on the operational performance of anaerobic hybrid reactors treating molasses wastewater was investigated under mesophilic and thermophilic conditions in a long-term laboratory-scale study over a 1,081 day period. The presence of sulphate reduced the COD removal efficiency under both mesophilic and thermophilic conditions. At 55°C, effluent acetate levels were consistently greater than 4000 mg L−1, indicating that thermophilic acetate-utilising methane-producing bacteria (MPB) or sulphate-reducing bacteria (

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20

Wai, SoeHtet, Yasuyuki Ota, Masakazu Sugiyama, and Kensuke Nishioka. "Evaluation of a Sabatier Reaction Utilizing Hydrogen Produced by Concentrator Photovoltaic Modules under Outdoor Conditions." Applied Sciences 10, no. 9 (2020): 3144. http://dx.doi.org/10.3390/app10093144.

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Power to gas (P2G) process chains have tremendous potential to enhance energy systems because of the capability of solar energy to convert solar radiation into electrical energy as well as the increasing use of specific gases as a means to store the resulting energy. Utilizing sunlight, photovoltaic systems are capable of producing useful gases such as hydrogen (H2) and methane (CH4). These gases are utilized in gas grids, transportation, and heavy industry. In employing a sunlight-derived gas, H2 production, by water disbanding, needs to be cost-effective with tremendous adaptability. New pow

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21

Fatmi, Dini, Admin Alif, and Hamzar Suyani. "PEMECAHAN (SPLITTING) MOLEKUL AIR MENJADI GAS H2DAN O2 MELALUI PROSES FOTOVOLTAIK." Jurnal Riset Kimia 5, no. 2 (2012): 107. http://dx.doi.org/10.25077/jrk.v5i2.209.

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One method to overcome the scarcity of alternative sources of energy on earth is through the development of photovoltaic cells. This method used a solar energy to electrical energy transformation. In this research, breaking (splitting) of water molecules into H2 and O2 gas by the photovoltaic process uses electrodes CuO/C with Na2SO4 electrolyte. In this process used 2 photovoltaic cells as electricity producing and U-shaped electrolysis cell for solver (splitting) of water molecule produce H2 and O2 gas. CuO electrode (anode) is made through the burning of copper rod in a furnace at temperatu

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22

Walter, S., S. Laukenmann, A. J. M. Stams, M. K. Vollmer, G. Gleixner, and T. Röckmann. "The stable isotopic signature of biologically produced molecular hydrogen (H<sub>2</sub>)." Biogeosciences Discussions 8, no. 6 (2011): 12521–41. http://dx.doi.org/10.5194/bgd-8-12521-2011.

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Abstract. Biologically produced molecular hydrogen (H2) is characterized by a very strong depletion in deuterium. Although the biological source to the atmosphere is small compared to photochemical or combustion sources, it makes an important contribution to the global isotope budget of molecular hydrogen (H2). Large uncertainties exist in the quantification of the individual production and degradation processes that contribute to the atmospheric budget, and isotope measurements are a tool to distinguish the contributions from the different sources. Measurements of δD from the various H2 sourc

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23

Tamburic, Bojan, Fessehaye W. Zemichael, Geoffrey C. Maitland, and Klaus Hellgardt. "Effect of the Light Regime and Phototrophic Conditions on Growth of the H2-producing Green Alga Chlamydomonas Reinhardtii." Energy Procedia 29 (2012): 710–19. http://dx.doi.org/10.1016/j.egypro.2012.09.083.

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24

Wüst, Pia K., Marcus A. Horn, and Harold L. Drake. "In Situ Hydrogen and Nitrous Oxide as Indicators of Concomitant Fermentation and Denitrification in the Alimentary Canal of the Earthworm Lumbricus terrestris." Applied and Environmental Microbiology 75, no. 7 (2009): 1852–59. http://dx.doi.org/10.1128/aem.02745-08.

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ABSTRACT The earthworm gut is a unique microzone in aerated soils that has been proposed to selectively stimulate ingested soil microorganisms by its in situ conditions, which include anoxia, high water content, a near-neutral pH, and high concentrations of organic compounds. The central objective of this study was to resolve potential links between in situ conditions and anaerobic microbial activities during the gut passage of Lumbricus terrestris. Both H2 and N2O were emitted by living earthworms, and in situ microsensor analyses revealed both H2 and N2O in the O2-free gut center. The highes

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25

Shiba, Nothando C., Xinying Liu, Diane Hildebrandt, and Yali Yao. "Effect of Pre-Treatment Conditions on the Activity and Selectivity of Cobalt-Based Catalysts for CO Hydrogenation." Reactions 2, no. 3 (2021): 258–74. http://dx.doi.org/10.3390/reactions2030016.

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We investigated the effect of pre-treatment conditions on the activity and selectivity of cobalt catalysts for Fischer–Tropsch synthesis (FTS) by varying both the reduction atmosphere and the reduction temperature. Catalysts supported on SiO2, Al2O3, and TiO2, prepared via incipient wetness impregnation, were evaluated, and activation temperatures in the range 250–350 °C were considered. Activation with syngas led to a better product selectivity (low CH4, high selectivity to liquid hydrocarbons, and low paraffin to olefin ratio (P/O)) than the catalysts reduced in H2 at lower activation temper

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26

Chen, Hanyu, Xi Wang, Zhixiang Pan, and Hongming Xu. "Numerical Simulation and Experimental Study on Commercial Diesel Reforming Over an Advanced Pt/Rh Three-Way Catalyst." Catalysts 9, no. 7 (2019): 590. http://dx.doi.org/10.3390/catal9070590.

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Hydrocarbon fuel reforming has been proven useful for producing hydrogen that is utilized on road vehicles, but it is associated with reaction mechanism and catalyst characterization. In this study, a reduced mechanism for n-heptane/toluene reforming over an advanced Pt/Rh TWC is adopted to investigate the effects of the reaction conditions on H2 and CO concentrations. The physical and chemical properties of the advanced catalyst are examined using SEM, XRD and XPS analyses. The contrasted experiments are conducted to study the composition variation tendency of the reforming reactor gas produc

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27

Mukhopadhyay, Sumita, Debajyoti Das, and Swati Ray. "Better control over the onset of microcrystallinity in fast-growing silicon network." Journal of Materials Research 19, no. 9 (2004): 2597–603. http://dx.doi.org/10.1557/jmr.2004.0338.

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In view of obtaining a Si:H network at the onset of microcrystallinity at a high deposition rate, we have adopted an intelligent approach to find out a tricky plasma condition in radio frequency (rf) plasma-enhanced chemical vapordeposition that provides a better control on growth introducing retarded microcrystallization. The deposition parameter includes a combination of high electrical power applied to the (SiH4+H2)-plasma and high gas pressure in thereaction chamber. High rf power increases the number density of film-forming precursors as well as atomic H density in the plasma, which helps

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28

Sangsong, Suntorn, Tanakorn Ratana, Sabaithip Tungkamani, Thana Sornchamni, Monrudee Phongaksorn, and Eric Croiset. "The Demonstration of the Superiority of the Dual Ni-Based Catalytic System for the Adjustment of the H2/CO Ratio in Syngas for Green Fuel Technologies." Catalysts 10, no. 9 (2020): 1056. http://dx.doi.org/10.3390/catal10091056.

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A novel dual Ni-based catalytic process (DCP) to control the H2/CO ratio of 2 in the syngas product within one step at temperature <700 °C was created and constructed. With the sequence of the catalysts located in the single reactor, the endothermic combined steam and CO2 reforming of methane (CSCRM) reaction and the exothermic ultra-high-temperature water–gas shift (UHT-WGS) reaction work continuously. During the process, the H2/CO ratio is raised suddenly at UHT-WGS after the syngas is produced from CSCRM, and CSCRM utilizes the heat released from UHT-WGS. Due to these features, DCP is mo

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29

Lang, Susan Q., Marvin D. Lilley, Tamara Baumberger, et al. "Extensive decentralized hydrogen export from the Atlantis Massif." Geology 49, no. 7 (2021): 851–56. http://dx.doi.org/10.1130/g48322.1.

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Abstract Hydrogen is an important energy source for subsurface microbial communities, but its availability beyond the flow focused through hydrothermal chimneys is largely unknown. We report the widespread export of H2 across the Atlantis Massif oceanic core complex (30°N, Mid-Atlantic Ridge; up to 44 nM), which is distinct from the circulation system feeding the Lost City Hydrothermal Field (LCHF) on the massif's southern wall. Methane (CH4) abundances are generally low to undetectable (&lt;3 nM) in fluids that are not derived from the LCHF. Reducing fluids exit the seafloor over a wide g

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30

Dzul Rashidi, Nur Farahana, Nur Syakina Jamali, Siti Syazwani Mahamad, et al. "Effects of Alginate and Chitosan on Activated Carbon as Immobilisation Beads in Biohydrogen Production." Processes 8, no. 10 (2020): 1254. http://dx.doi.org/10.3390/pr8101254.

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In this study, the effects of alginate and chitosan as entrapped materials in the biofilm formation of microbial attachment on activated carbon was determined for biohydrogen production. Five different batch fermentations, consisting of mixed concentration alginate (Alg), were carried out in a bioreactor at temperature of 60 °C and pH 6.0, using granular activated carbon (GAC) as a primer for cell attachment and colonisation. It was found that the highest hydrogen production rate (HPR) of the GAC–Alg beads was 2.47 ± 0.47 mmol H2/l.h, and the H2 yield of 2.09 ± 0.22 mol H2/mol sugar was obtain

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31

Wrubel, Jacob A., Jason Zack, Andrew M. Park, and Guido Bender. "Operando Measurement of Hydrogen Crossover in Proton Exchange Membrane Electrolysis Cells at Differential Pressures." ECS Meeting Abstracts MA2022-02, no. 39 (2022): 1440. http://dx.doi.org/10.1149/ma2022-02391440mtgabs.

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Low temperature water electrolysis (LTE) using proton exchange membrane electrolysis cells (PEMECs) is a promising approach for producing green H2 that can use electricity from renewable sources. In practice, H2 is stored and dispensed at high pressures. To alleviate efficiency losses associated with pressurizing the product hydrogen, PEMECs can be operated at high differential pressures, e.g., >30bar on the cathode side. However, high differential pressure operation can result in undesirable H2 crossover to the anode (O2) side. This not only reduces the Faradaic efficiency of the cell, but

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32

Dujjanutat, Praepilas, Arthit Neramittagapong, and Pakawadee Kaewkannetra. "Optimization of Bio-Hydrogenated Kerosene from Refined Palm Oil by Catalytic Hydrocracking." Energies 12, no. 16 (2019): 3196. http://dx.doi.org/10.3390/en12163196.

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In this work, hydro-processing was used as an alternative route for producing bio-hydrogenated kerosene (BHK) from refined bleached deodorized palm oil (RPO) in the presence of a 0.5 wt% Pd/Al2O3 catalyst. The Box-Behnken Design was used to determine the effects of reaction temperature, H2 pressure, and reaction time in terms of liquid hourly space velocity (LHSV) on BHK production. The kerosene selectivity was used as the response for staticial interpretation. The results show that both temperature and LHSV produced significant effects, whereas H2 pressure did not. The optimal conditions were

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33

Walter, S., S. Laukenmann, A. J. M. Stams, M. K. Vollmer, G. Gleixner, and T. Röckmann. "The stable isotopic signature of biologically produced molecular hydrogen (H<sub>2</sub>)." Biogeosciences 9, no. 10 (2012): 4115–23. http://dx.doi.org/10.5194/bg-9-4115-2012.

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Abstract. Biologically produced molecular hydrogen (H2) is characterised by a very strong depletion in deuterium. Although the biological source to the atmosphere is small compared to photochemical or combustion sources, it makes an important contribution to the global isotope budget of H2. Large uncertainties exist in the quantification of the individual production and degradation processes that contribute to the atmospheric budget, and isotope measurements are a tool to distinguish the contributions from the different sources. Measurements of δ D from the various H2 sources are scarce and fo

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34

Ye, Feng, Shuanshi Fan, Wenjun Li, et al. "Simultaneous Production of Aromatics and COx-Free Hydrogen via Methane Dehydroaromatization in Membrane Reactors: A Simulation Study." Membranes 12, no. 12 (2022): 1175. http://dx.doi.org/10.3390/membranes12121175.

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As an alternative route for aromatics and hydrogen production, methane dehydroaromatization (MDA) is of significant academic and industrial interest due to the abundance of natural gas resources and the intensive demand for aromatics and COx-free hydrogen. In the present work, a simulation study on MDA in membrane reactors (MRs) was performed with the aim of co-producing aromatics and COx-free hydrogen with a highly improved efficiency. The effects of various parameters, including catalytic activity, membrane flux and selectivity, as well as the operating conditions on the MR performance were

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35

Al-Mubaddel, Fahad, Samsudeen Kasim, Ahmed A. Ibrahim, Abdulrhman S. Al-Awadi, Anis H. Fakeeha, and Ahmed S. Al-Fatesh. "H2 Production from Catalytic Methane Decomposition Using Fe/x-ZrO2 and Fe-Ni/(x-ZrO2) (x = 0, La2O3, WO3) Catalysts." Catalysts 10, no. 7 (2020): 793. http://dx.doi.org/10.3390/catal10070793.

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An environmentally-benign way of producing hydrogen is methane decomposition. This study focused on methane decomposition using Fe and Fe-Ni catalysts, which were dispersed over different supports by the wet-impregnation method. We observed the effect of modifying ZrO2 with La2O3 and WO3 in terms of H2 yield and carbon deposits. The modification led to a higher H2 yield in all cases and WO3-modified support gave the highest yield of about 90% and was stable throughout the reaction period. The reaction conditions were at 1 atm, 800 °C, and 4000 mL(hgcat)−1 space velocity. Adding Ni to Fe/x-ZrO2

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Pohorelic, Brant K. J., Johanna K. Voordouw, Elisabeth Lojou, Alain Dolla, Jens Harder, and Gerrit Voordouw. "Effects of Deletion of Genes Encoding Fe-Only Hydrogenase of Desulfovibrio vulgaris Hildenborough on Hydrogen and Lactate Metabolism." Journal of Bacteriology 184, no. 3 (2002): 679–86. http://dx.doi.org/10.1128/jb.184.3.679-686.2002.

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ABSTRACT The physiological properties of a hyd mutant of Desulfovibrio vulgaris Hildenborough, lacking periplasmic Fe-only hydrogenase, have been compared with those of the wild-type strain. Fe-only hydrogenase is the main hydrogenase of D. vulgaris Hildenborough, which also has periplasmic NiFe- and NiFeSe-hydrogenases. The hyd mutant grew less well than the wild-type strain in media with sulfate as the electron acceptor and H2 as the sole electron donor, especially at a high sulfate concentration. Although the hyd mutation had little effect on growth with lactate as the electron donor for su

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Nesse, Live L., Camilla Sekse, Kristin Berg, et al. "Potentially Pathogenic Escherichia coli Can Form a Biofilm under Conditions Relevant to the Food Production Chain." Applied and Environmental Microbiology 80, no. 7 (2013): 2042–49. http://dx.doi.org/10.1128/aem.03331-13.

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ABSTRACTThe biofilm-producing abilities of potentially human-pathogenic serotypes ofEscherichia colifrom the ovine reservoir were studied at different temperatures and on different surfaces. A possible influence of the hydrophobicity of the bacterial cells, as well as the presence of two virulence factors, the Shiga toxin-encoding (Stx) bacteriophage and theeaegene, was also studied. A total of 99E. coliisolates of serotypes O26:H11, O103:H2, and O103:H25 isolated from sheep feces were included. The results show that isolates of all threeE. coliserotypes investigated can produce biofilm on sta

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Gabriel, André, Alison F. Nogueira, Douglas M. Zeffa, et al. "Productivity, physicochemical quality and early flowering resistance of experimental onion hybrids." Horticultura Brasileira 40, no. 2 (2022): 197–207. http://dx.doi.org/10.1590/s0102-0536-20220209.

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ABSTRACT In order to produce bulbs or seeds, onion plants depend on genotype X environment interaction. Thus, breeders shall select the genotypes based on the climatic conditions of each producing region. This study aimed to evaluate 17 experimental onion hybrids and two commercial genotypes (‘Bella Dura’ and ‘Buccaneer’), based on agronomic, physicochemical attributes of the bulbs and resistance to early flowering under subtropical conditions. Joint analysis of variance and phenotypic divergence estimated through principal component analysis (PCA) and Ward’s hierarchical clustering were perfo

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Sokolova, Tatyana G., Nadezhda A. Kostrikina, Nikolai A. Chernyh, Tatjana V. Kolganova, Tatjana P. Tourova, and Elizaveta A. Bonch-Osmolovskaya. "Thermincola carboxydiphila gen. nov., sp. nov., a novel anaerobic, carboxydotrophic, hydrogenogenic bacterium from a hot spring of the Lake Baikal area." International Journal of Systematic and Evolutionary Microbiology 55, no. 5 (2005): 2069–73. http://dx.doi.org/10.1099/ijs.0.63299-0.

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A novel anaerobic, thermophilic, alkalitolerant bacterium, strain 2204T, was isolated from a hot spring of the Baikal Lake region. The cells of strain 2204T were straight rods of variable length, Gram-positive with an S-layer, motile with one to two lateral flagella, and often formed aggregates of 3–15 cells. The isolate was shown to be an obligate anaerobe oxidizing CO and producing equimolar quantities of H2 and CO2 according to the equation CO+H2O→CO2+H2. No organic substrates were used as energy sources. For lithotrophic growth on CO, 0·2 g acetate or yeast extract l−1 was required but did

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Novikov, Andrey A., Tatyana G. Sokolova, Alexander V. Lebedinsky, Tatyana V. Kolganova, and Elizaveta A. Bonch-Osmolovskaya. "Carboxydothermus islandicus sp. nov., a thermophilic, hydrogenogenic, carboxydotrophic bacterium isolated from a hot spring." International Journal of Systematic and Evolutionary Microbiology 61, no. 10 (2011): 2532–37. http://dx.doi.org/10.1099/ijs.0.030288-0.

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An anaerobic, thermophilic bacterium, strain SET IS-9T, was isolated from an Icelandic hot spring. Cells of strain SET IS-9T are short, slightly curved, motile rods. The strain grows chemolithotrophically on CO, producing equimolar quantities of H2 and CO2. It also grows fermentatively on lactate or pyruvate in the presence of yeast extract (0.2 g l−1). Products of pyruvate fermentation are acetate, CO2 and H2. Growth occurs at 50–70 °C, with an optimum at 65 °C, and at pH 5.0–8.0, with an optimum at pH 5.5–6.0. The generation time during chemolithotrophic growth on CO under optimal conditions

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Slepova, Tatiana V., Tatyana G. Sokolova, Anatoly M. Lysenko, et al. "Carboxydocella sporoproducens sp. nov., a novel anaerobic CO-utilizing/H2-producing thermophilic bacterium from a Kamchatka hot spring." International Journal of Systematic and Evolutionary Microbiology 56, no. 4 (2006): 797–800. http://dx.doi.org/10.1099/ijs.0.63961-0.

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A novel anaerobic, thermophilic, CO-utilizing bacterium, strain KarT, was isolated from a hot spring of Karymskoe Lake, Kamchatka Peninsula. The cells of the novel isolate were Gram-positive, spore-forming, short rods. The bacterium grew chemolithoautotrophically on CO, producing equimolar quantities of H2 and CO2 (according to the equation CO + H2O → CO2 + H2), and in the absence of CO, under N2 in the gas phase, chemoorganoheterotrophically with yeast extract, sucrose or pyruvate. Growth was observed in the temperature range 50–70 °C, with an optimum at 60 °C, and in the pH range 6·2–8·0, wi

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Yip, Terence, Kai-Chung Tse, Man-Fai Lam, et al. "Risk Factors and Outcomes of Extended-Spectrum Beta-Lactamase-Producing E. Coli Peritonitis in Capd Patients." Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis 26, no. 2 (2006): 191–97. http://dx.doi.org/10.1177/089686080602600213.

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Objective To determine the risk factors and outcomes of peritonitis caused by extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli in continuous ambulatory peritoneal dialysis (CAPD). Patients and Methods Episodes of E. coli CAPD peritonitis in our unit from October 1994 to August 2003 were reviewed. Demographic data, underlying medical conditions, recent use of gastric acid inhibitors (including H2 antagonist and proton pump inhibitor), recent antibiotic therapy, antibiotic regimen for peritonitis episodes, sensitivity test results of the E. coli isolated, and clinical outcomes

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Falabella Sousa-Aguiar, Eduardo, Carolina Zanon Costa, Maria Antonieta Peixoto Gimenes Couto, Débora de Almeida Azevedo, and José Faustino Souza de Carvalho Filho. "Conversion of Residual Palm Oil into Green Diesel and Biokerosene Fuels under Sub- and Supercritical Conditions Employing Raney Nickel as Catalyst." Catalysts 11, no. 8 (2021): 995. http://dx.doi.org/10.3390/catal11080995.

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A comprehensive study of the thermal deoxygenation of palm residue under sub- and supercritical water conditions using Raney nickel as a heterogeneous catalyst is presented in this paper. Hydrothermal technology was chosen to replace the need for hydrogen as a reactant, as happens, for example, in catalytic hydrotreatment. Several experiments were carried out at different reaction temperatures (350, 370, and 390 °C) and were analyzed with different times of reaction (1, 3.5, and 6 h) and catalyst loads (5, 7.5, 10 wt.%). No hydrogen was introduced in the reactions, but it was produced in situ.

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Klimenko, V. M., and T. T. Suprun. "METHANATION TECHNOLOGIES FOR PRODUCING SYNTHETIC RENEWABLE METHANE." Thermophysics and Thermal Power Engineering 46, no. 3 (2022): 63–72. http://dx.doi.org/10.31472/ttpe.3.2022.6.

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Methanation, or the generation of synthetic methane through the combination of carbon dioxide and hydrogen, has been attracting more and more attention of researchers and energy scientists in recent years due to the fact that the development of an effective and economically feasible technology for the implementation of this process will allow solving a number of energy and environmental problems. First, it is the accumulation of excess renewable electricity from solar and wind power plants by using it in the creation of another energy-intensive product, namely synthetic natural gas, which remo

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Tommasi, T., G. Sassi, and B. Ruggeri. "Acid pre-treatment of sewage anaerobic sludge to increase hydrogen producing bacteria HPB: effectiveness and reproducibility." Water Science and Technology 58, no. 8 (2008): 1623–28. http://dx.doi.org/10.2166/wst.2008.506.

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The present study is aimed to test the effectiveness and the reproducibility of the acid pre-treatment of sewage sludge to suppress the methanogenic bacteria activity, in order to increase the hydrogen forming bacteria activity, mainly Clostridium species. The treated sludge has been tested on glucose reach medium under mesophilic conditions (35°C), in batch mode to quantify the biological fermentative hydrogen production. In the whole series of experiments, the main components of biogas are hydrogen (52–60%) and carbon dioxide (40–48%); no methane and hydrogen sulphide were present in it. The

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Rodríguez-Reyes, Juan José, Octavio García-Depraect, Roberto Castro-Muñoz, and Elizabeth León-Becerril. "Dark Fermentation Process Response to the Use of Undiluted Tequila Vinasse without Nutrient Supplementation." Sustainability 13, no. 19 (2021): 11034. http://dx.doi.org/10.3390/su131911034.

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The technical feasibility of valorizing tequila vinasse (TV), a wastewater with high pollution potential, through the production of biogenic hydrogen via dark fermentation, has long been proven in diverse lab-scale reactors that were operated either in batch or continuous mode. However, such systems have mainly been tested with diluted streams and nutrient supplementation, hindering the techno-economic attractiveness of the TV-to-hydrogen concept at large scale. In this study, the feasibility of producing hydrogen from high-strength undiluted TV with no added extra nutrients was evaluated unde

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Hayakawa, Kayoko, Sureka Gattu, Dror Marchaim та ін. "Epidemiology and Risk Factors for Isolation of Escherichia coli Producing CTX-M-Type Extended-Spectrum β-Lactamase in a Large U.S. Medical Center". Antimicrobial Agents and Chemotherapy 57, № 8 (2013): 4010–18. http://dx.doi.org/10.1128/aac.02516-12.

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ABSTRACTA case-case-control study was conducted to identify independent risk factors for recovery ofEscherichia colistrains producing CTX-M-type extended-spectrum β-lactamases (CTX-ME. coli) within a large Southeastern Michigan medical center. Unique cases with isolation of ESBL-producingE. colifrom February 2010 through July 2011 were analyzed by PCR forblaCTX-M,blaTEM, andblaSHVgenes. Patients with CTX-ME. coliwere compared to patients withE. colistrains not producing CTX-M-type ESBLs (non-CTX-ME. coli) and uninfected controls. Of 575 patients with ESBL-producingE. coli, 491 (85.4%) isolates

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Imizcoz, Mikel, and Alberto V. Puga. "Assessment of Photocatalytic Hydrogen Production from Biomass or Wastewaters Depending on the Metal Co-Catalyst and Its Deposition Method on TiO2." Catalysts 9, no. 7 (2019): 584. http://dx.doi.org/10.3390/catal9070584.

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A systematic study on the solar photocatalytic hydrogen production (photoreforming) performance of M/TiO2 (M = Au, Ag, Cu or Pt) using glucose as a model substrate, and further extended to lignocellulose hydrolysates and wastewaters, is herein presented. Three metal (M) co-catalyst loading methods were tested. Variation of the type of metal results in significantly dissimilar H2 production rates, albeit the loading method exerts an even greater effect in most cases. Deposition-precipitation (followed by hydrogenation) or photodeposition provided better results than classical impregnation (foll

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Senko, Olga, Olga Maslova, Marina Gladchenko, et al. "Prospective Approach to the Anaerobic Bioconversion of Benzo- and Dibenzothiophene Sulfones to Sulfide." Molecules 24, no. 9 (2019): 1736. http://dx.doi.org/10.3390/molecules24091736.

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Sulfur recovery from organic molecules such as toxic sulfones is an actual problem, and its solution through the use of environmentally friendly and nature-like processes looks attractive for research and application. For the first time, the possible bioconversion of organic sulfones (benzo-and dibenzothiophene sulfones) to inorganic sulfide under anaerobic conditions with simultaneous biogas production from glucose within a methanogenesis process is demonstrated. Biogas with a methane content of 50.7%–82.1% was obtained without H2S impurities. Methanogenesis with 99.7%–100% efficiency and 97.

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Sawamura, Okamoto, and Todokoro. "Development of Mass Production Technology of Highly Permeable Nano-Porous Supports for Silica-Based Separation Membranes." Membranes 9, no. 8 (2019): 103. http://dx.doi.org/10.3390/membranes9080103.

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Silica-based membranes show both robust properties and high-permeability, offering us great potential for applying them to harsh conditions where conventional organic membranes cannot work. Despite the increasing number of paper and patents of silica-based membranes, their industrial applications have yet to be fully realized, possibly due to their lack of technologies on scaling-up and mass production. In particular, quality of membrane supports decisively impacts final quality of silica-based separation membranes. In this study, therefore, we have developed mass producing technologies of nan

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