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Journal articles on the topic 'Organic reducers'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Liu, Fengbao, Jinsheng Sun, Xianbin Huang, and Yuan Geng. "Development of a Low-Molecular-Weight Filtrate Reducer with High-Temperature Resistance for Drilling Fluid Gel System." Gels 9, no. 10 (2023): 805. http://dx.doi.org/10.3390/gels9100805.

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Currently, conventional polymeric filtrate reducers with high-temperature resistance for use in drilling fluids have high molecular weights, which greatly affects the rheological properties. Therefore, to address the challenges in regulating the rheology and filtration performance of high-density drilling fluids at high temperatures, it is essential to develop low-molecular-weight filtrate reducers with high-temperature resistance. In this study, a low-molecular-weight filtrate reducer with high-temperature resistance (LMF) was prepared via free radical polymerization from acrylamide and 2-acr

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2

Wang, Qin, Chong Zhi Li, Jun Chao Liu, and Mo Yi Xu. "Study and Application of a Modified Agent GHPC-1 for Green High-Performance Concrete." Advanced Materials Research 535-537 (June 2012): 1955–60. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1955.

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A modified agent GHPC-1 for green high-performance concrete was composed of the strength-increasing groups of organic alcohol amine, the slump-retaining groups of carboxylate polymer and the workability-stabilizing groups of amide. It could be used through substituting some of polycarboxylate water-reducers or combining with polycarboxylate water-reducers to modify the workability of fresh concrete and to increase the strength of hardened concrete. The adaptability tests of cementing materials with admixtures show that the dispersing ability was almost not influenced but the retaining ability

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3

Sun, Wei, Bojun Li, Weiping Zhu, et al. "Research on adsorption and damage characteristics of slick water in coalbed methane development." IOP Conference Series: Earth and Environmental Science 984, no. 1 (2022): 012001. http://dx.doi.org/10.1088/1755-1315/984/1/012001.

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Abstract In the process of coalbed fracturing, the drag reducers absorbed on the surface of the coalbed causes water lock damage and decreases gas production efficiency of coalbed methane. Thus, research on low-damage coalbed drag reducers is of great significance. Aiming at four drag reducers with different molecular weights, the law of drag reducers adsorption was investigated through static adsorption test and contact angle tests. Afterwards, a core displacement experiment was carried out to study the damage rate of slick water to the coabed, and the nanoemulsion CND was used for competitiv

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4

Chï¿½neby, D., A. Brauman, B. Rabary, and L. Philippot. "Differential Responses of Nitrate Reducer Community Size, Structure, and Activity to Tillage Systems." Applied and Environmental Microbiology 75, no. 10 (2009): 3180–86. http://dx.doi.org/10.1128/aem.02338-08.

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ABSTRACT The main objective of this study was to determine how the size, structure, and activity of the nitrate reducer community were affected by adoption of a conservative tillage system as an alternative to conventional tillage. The experimental field, established in Madagascar in 1991, consists of plots subjected to conventional tillage or direct-seeding mulch-based cropping systems (DM), both amended with three different fertilization regimes. Comparisons of size, structure, and activity of the nitrate reducer community in samples collected from the top layer in 2005 and 2006 revealed tha

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5

Choi, Euiso, and Jay M. Rim. "Competition and Inhibition of Sulfate Reducers and Methane Producers in Anaerobic Treatment." Water Science and Technology 23, no. 7-9 (1991): 1259–64. http://dx.doi.org/10.2166/wst.1991.0577.

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Competition for substrate between sulfate reducing and methane producing bacteria, and the inhibitory effects of sulfide produced from microbial sulfate reduction were investigated in this study for the selection of a proper anaerobic treatment process using laboratory anaerobic contact units. Substrates used were both synthetic waste with various COD/SO42− ratios, and industrial wastes. Sulfate reducers and methane producers were very competitive at COD/SO42− ratio of 1.7 to 2.7. As the ratio increased/methane producers predominated, and sulfate reducers were predominating as the ratio decrea

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6

Zhang, Fan, Qun Zhang, Zhaohui Zhou, Lingling Sun, and Yawen Zhou. "Study on the Effect of Different Viscosity Reducers on Viscosity Reduction and Emulsification with Daqing Crude Oil." Molecules 28, no. 3 (2023): 1399. http://dx.doi.org/10.3390/molecules28031399.

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The urgent problem to be solved in heavy oil exploitation is to reduce viscosity and improve fluidity. Emulsification and viscosity reduction technology has been paid more and more attention and its developments applied. This paper studied the viscosity reduction performance of three types of viscosity reducers and obtained good results. The viscosity reduction rate, interfacial tension, and emulsification performance of three types of viscosity reducers including anionic sulfonate, non-ionic (polyether and amine oxide), and amphoteric betaine were compared with Daqing crude oil. The results s

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7

Tang, Zhichuan, Zhengsong Qiu, Hanyi Zhong, Hui Mao, Kai Shan, and Yujie Kang. "Novel Acrylamide/2-Acrylamide-2-3 Methylpropanesulfonic Acid/Styrene/Maleic Anhydride Polymer-Based CaCO3 Nanoparticles to Improve the Filtration of Water-Based Drilling Fluids at High Temperature." Gels 8, no. 5 (2022): 322. http://dx.doi.org/10.3390/gels8050322.

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Filtration loss control under high-temperature conditions is a worldwide issue among water-based drilling fluids (WBDFs). A core–shell high-temperature filter reducer (PAASM-CaCO3) that combines organic macromolecules with inorganic nanomaterials was developed by combining acrylamide (AM), 2-acrylamide-2-methylpropane sulfonic acid (AMPS), styrene (St), and maleic anhydride (MA) as monomers and nano-calcium carbonate (NCC). The molecular structure of PAASM-CaCO3 was characterized. The average molecular weight of the organic part was 6.98 × 105 and the thermal decomposition temperature was abou

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Zavarzina, D. G., A. A. Klyukina, A. Y. Merkel, T. A. Maslova, and A. A. Maslov. "Alkalothermophilic Iron-Reducing Bacteria of the Goryachinsk Thermal Water Basin." Microbiology 93, no. 6 (2024): 864–75. http://dx.doi.org/10.1134/s0026261724606845.

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Abstract A study of iron-reducing prokaryotes that use the poorly crystalline mineral ferrihydrite as an electron acceptor revealed their widespread occurrence on the planet. However, the ability of iron reducers to develop under polyextreme conditions (at elevated values of pH and temperature) has not been previously demonstrated. To confirm the existence of alkalothermophilic iron reducers, we studied the water and sediment samples from the Goryachinsk nitrogen-rich thermal water basin. These springs are associated with young tectonic fractures in the Baikal rift zone; their water is charact

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9

Baloza, Marwa, Susann Henkel, Sabine Kasten, Moritz Holtappels, and Massimiliano Molari. "The Impact of Sea Ice Cover on Microbial Communities in Antarctic Shelf Sediments." Microorganisms 11, no. 6 (2023): 1572. http://dx.doi.org/10.3390/microorganisms11061572.

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The area around the Antarctic Peninsula (AP) is facing rapid climatic and environmental changes, with so far unknown impacts on the benthic microbial communities of the continental shelves. In this study, we investigated the impact of contrasting sea ice cover on microbial community compositions in surface sediments from five stations along the eastern shelf of the AP using 16S ribosomal RNA (rRNA) gene sequencing. Redox conditions in sediments with long ice-free periods are characterized by a prevailing ferruginous zone, whereas a comparatively broad upper oxic zone is present at the heavily

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10

Wei, Juanming, Wenfeng Jia, Luo Zuo, Hao Chen, and Yujun Feng. "Turbulent Drag Reduction with an Ultra-High-Molecular-Weight Water-Soluble Polymer in Slick-Water Hydrofracking." Molecules 27, no. 2 (2022): 351. http://dx.doi.org/10.3390/molecules27020351.

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Water-soluble polymers as drag reducers have been widely utilized in slick-water for fracturing shale oil and gas reservoirs. However, the low viscosity characteristics, high operating costs, and freshwater consumption of conventional friction reducers limit their practical use in deeper oil and gas reservoirs. Therefore, a high viscosity water-soluble friction reducer (HVFR), poly-(acrylamide-co-acrylic acid-co-2-acrylamido-2-methylpropanesulphonic acid), was synthesized via free radical polymerization in aqueous solution. The molecular weight, solubility, rheological behavior, and drag reduc

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11

Yusifova, A., B. Asadova, and S. Aslanova. "General Characteristics of Azerbaijan Forage Plants and Their Mycobiota and Mycological Safety Principles Applied During Use." Bulletin of Science and Practice 10, no. 8 (2024): 66–74. http://dx.doi.org/10.33619/2414-2948/105/08.

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As it is known, all living things constantly exchange food and energy with the environment in order to continue their life activities and participate in the ecological functions they perform in nature, and this situation is ecologically both producers (plants), consumers (animals), and reducers (fungi). and bacteria). Nevertheless, the dependence on the environment of consumers as well as reducers is a more sensitive feature than that of producers, since both of the latter, i.e., fungi and animals, are heterotrophs due to their nutrition, i.e., because they cannot carry out the process of phot

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Zavarzina, D. G., A. A. Klyukina, A. Yu Merkel, T. A. Maslova, and A. A. Maslov. "Alkalo-thermophilic iron-reducing bacteria of the Goryachinskoe thermal water deposit." Microbiology 93, no. 6 (2024): 818–31. https://doi.org/10.31857/s0026365624060124.

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A study of the metabolic group of iron-reducing prokaryotes that use the weakly crystalline mineral ferrihydrite as an electron acceptor has revealed its widespread distribution on Earth. However, the ability of iron reducers to develop in polyextreme conditions – at elevated pH values and temperatures – has not yet been demonstrated. To prove the existence of alkalithermophilic iron reducers, we studied water and sediment samples from the Goryachinsk nitrogen springs. These springs are confined to young tectonic faults of the Baikal rift zone, and their waters are characterized by low mineral

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13

Li, Ting, Yan Ping Yin, Li Ning Gao, and Hua Xin Chen. "Research on the Improving of Warm Mix Asphalt Technology by Adding Organic Viscosity-Reducers." Advanced Materials Research 1079-1080 (December 2014): 118–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1079-1080.118.

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Inconsideration of the application defects of organic viscosity-reducing warm mixasphalt (represented by Sasobit), such as poor adhesion with aggregate,inadequate of low-temperature deformation, four methods for Sasobit modificationwere proposed and they were blending with polymer, grafting, hydroisomerizationand adjusting molecular weightdistribution width,then the feasibility of each method was analyzed. Moreover, given that performance evaluation of warm mix asphaltmixture still referenced for that of hot mix asphalt mixture, adhesion (water stability) evaluation method based on surface fre

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14

Dasgupta, Shamik, Xiaotong Peng, and Kaiwen Ta. "Interaction between Microbes, Minerals, and Fluids in Deep-Sea Hydrothermal Systems." Minerals 11, no. 12 (2021): 1324. http://dx.doi.org/10.3390/min11121324.

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The discovery of deep-sea hydrothermal vents in the late 1970s widened the limits of life and habitability. The mixing of oxidizing seawater and reduction of hydrothermal fluids create a chemical disequilibrium that is exploited by chemosynthetic bacteria and archaea to harness energy by converting inorganic carbon into organic biomass. Due to the rich variety of chemical sources and steep physico-chemical gradients, a large array of microorganisms thrive in these extreme environments, which includes but are not restricted to chemolithoautotrophs, heterotrophs, and mixotrophs. Past research ha

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15

Skidmore, Mark L., Julia M. Foght, and Martin J. Sharp. "Microbial Life beneath a High Arctic Glacier." Applied and Environmental Microbiology 66, no. 8 (2000): 3214–20. http://dx.doi.org/10.1128/aem.66.8.3214-3220.2000.

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ABSTRACT The debris-rich basal ice layers of a high Arctic glacier were shown to contain metabolically diverse microbes that could be cultured oligotrophically at low temperatures (0.3 to 4°C). These organisms included aerobic chemoheterotrophs and anaerobic nitrate reducers, sulfate reducers, and methanogens. Colonies purified from subglacial samples at 4°C appeared to be predominantly psychrophilic. Aerobic chemoheterotrophs were metabolically active in unfrozen basal sediments when they were cultured at 0.3°C in the dark (to simulate nearly in situ conditions), producing 14CO2from radiolabe

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16

Urbańska, Weronika. "Recovery of Co, Li, and Ni from Spent Li-Ion Batteries by the Inorganic and/or Organic Reducer Assisted Leaching Method." Minerals 10, no. 6 (2020): 555. http://dx.doi.org/10.3390/min10060555.

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The battery powder (anodic and cathodic mass) manually separated from spent Li-ion batteries used in laptops was subjected to acidic reductive leaching to recover the Co, Li, and Ni contained in it. In the laboratory experiments, 1.5 M sulfuric acid was used as the leaching agent and the reducing agents were 30% H2O2 solution or/and glutaric acid. Glutaric acid is a potential new reducing agent in the leaching process of spent lithium-ion batteries (LIBs). The influence of the type of the used reducer on obtained recovery degrees of Co, Li, and Ni as well as the synergism of the two tested red

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17

Li, Ming-Jun, Meng-Yun Wei, Xiao-Ting Fan, and Guo-Wei Zhou. "Underestimation about the Contribution of Nitrate Reducers to Iron Cycling Indicated by Enterobacter Strain." Molecules 27, no. 17 (2022): 5581. http://dx.doi.org/10.3390/molecules27175581.

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Nitrate-reducing iron(II) oxidation (NRFO) has been intensively reported in various bacteria. Iron(II) oxidation is found to be involved in both enzymatic and chemical reactions in nitrate-reducing Fe(II)-oxidizing microorganisms (NRFOMs). However, little is known about the relative contribution of biotic and abiotic reactions to iron(II) oxidation for the common nitrate reducers during the NRFO process. In this study, the typical nitrate reducers, four Enterobacter strains E. hormaechei, E. tabaci, E. mori and E. asburiae, were utilized as the model microorganisms. The comparison of the kinet

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18

Ahmad Yunus Nasution. "DEVELOPMENT OF KNIFE EYES ON THE MAKING PROCESS OF ORGANIC BURNING PROCESS OF 7 LITERS FOR UMKM." ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat 3, no. 2 (2019): 110–17. http://dx.doi.org/10.32734/abdimastalenta.v3i2.2637.

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The planning and design of the blades mixer for the organic slurry dough mixer is the application of the sciences obtained in real college. The main purpose of making blades mixer for this slurry dough mixer is to get an effective, efficient blades mixer design and higher quality organic slurry. With the making of this blades mixer, it is expected to contribute positively in the middle industry engaged in the food industry. The author designed several forms of modeling of blades mixer capable of stirring the organic pulp mixture with a capacity of 7 liters. The blades mixer are planned to use

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19

Stams, A. J. M., C. M. Plugge, F. A. M. de Bok, et al. "Metabolic interactions in methanogenic and sulfate-reducing bioreactors." Water Science and Technology 52, no. 1-2 (2005): 13–20. http://dx.doi.org/10.2166/wst.2005.0493.

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In environments where the amount of electron acceptors is insufficient for complete breakdown of organic matter, methane is formed as the major reduced end product. In such methanogenic environments organic acids are degraded by syntrophic consortia of acetogenic bacteria and methanogenic archaea. Hydrogen consumption by methanogens is essential for acetogenic bacteria to convert organic acids to acetate and hydrogen. Several syntrophic cocultures growing on propionate and butyrate have been described. These syntrophic fatty acid-degrading consortia are affected by the presence of sulfate. Whe

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20

Rao, S. S., M. D. Dickman, and H. G. Thode. "Isotopic and Diatom Evidence of Bacterial Sulphate Reduction in Sediments." Water Quality Research Journal 24, no. 2 (1989): 215–32. http://dx.doi.org/10.2166/wqrj.1989.013.

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Abstract Sulphur contents and sulphur isotope ratios (δ34 So/00 values) in deep sediments (10–12 cms; circa 50–100 years before the present) and surface sediments (0–2 cm; circa 0–10 years before the present) from eight lakes located north of Lake Superior, Canada indicated that surface sediments had a significantly higher sulphur content (largely organic sulphur) per gram dry weight and a lower sulphur isotope ratio than the deeper layers. The increased sulphur content and decreased sulphur isotope ratios (δ34 S0/00 values) in the surficial sediments were much greater for the lakes near and d

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21

Baptista, J. D. C., T. Donnelly, D. Rayne, and R. J. Davenport. "Microbial mechanisms of carbon removal in subsurface flow wetlands." Water Science and Technology 48, no. 5 (2003): 127–34. http://dx.doi.org/10.2166/wst.2003.0298.

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The microbial mechanisms of carbon removal in subsurface flow wetlands were studied, in one wetland with plants and one without plants. Particular emphasis was given to the influence of plants in the treatment process. Wetlands without plants showed higher carbon removal than those with plants, 63% and 51%, respectively (p&lt;0.05). Molecular analysis of the bacterial diversity, growth rates and specific microbial activities showed that the two wetlands were different, especially towards the outlet of the two systems. Sulphate reducers and methanogens were found in both wetlands, and they

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Polprasert, Chongchin, and Charles N. Haas. "Effect of sulfate on anaerobic processes fed with dual substrates." Water Science and Technology 31, no. 9 (1995): 101–7. http://dx.doi.org/10.2166/wst.1995.0349.

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Anaerobic reactors were operated in a semi-batch mode and fed with the dual substrates glucose (G) plus acetic acid (Ac) as primary organic sources to study the effect of sulfate on COD oxidation. With glucose, COD removal by methane formation was seriously inhibited, resulting in COD accumulation in the reactor. Although acetic acid can be consumed by some sulfate-reducing species, it was not a major substrate for sulfate reduction, but was largely responsible for methane formation in the anaerobic mixed culture used in this study. With dual substrates, extreme inhibition of methanogenesis di

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23

Kumar, Brajesh. "Green Synthesis of Gold, Silver, and Iron Nanoparticles for the Degradation of Organic Pollutants in Wastewater." Journal of Composites Science 5, no. 8 (2021): 219. http://dx.doi.org/10.3390/jcs5080219.

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The green synthesis of nanoscale materials is of special interest to researchers all over the world. We describe a simple, robust, inexpensive, and environmentally friendly approach to the synthesis of gold, silver, and iron nanoparticles using a variety of biomolecules/phytochemicals as potential reducers and stabilizers. The green approach to the controlled synthesis of nanoparticles with different morphologies is based on the use of plant extracts. Green synthesized nanoparticles can be used as catalysts, photocatalysts, adsorbents, or alternative agents for the elimination of various organ

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Bradley, J. A., S. Arndt, J. P. Amend, et al. "Widespread energy limitation to life in global subseafloor sediments." Science Advances 6, no. 32 (2020): eaba0697. http://dx.doi.org/10.1126/sciadv.aba0697.

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Microbial cells buried in subseafloor sediments comprise a substantial portion of Earth’s biosphere and control global biogeochemical cycles; however, the rate at which they use energy (i.e., power) is virtually unknown. Here, we quantify organic matter degradation and calculate the power utilization of microbial cells throughout Earth’s Quaternary-age subseafloor sediments. Aerobic respiration, sulfate reduction, and methanogenesis mediate 6.9, 64.5, and 28.6% of global subseafloor organic matter degradation, respectively. The total power utilization of the subseafloor sediment biosphere is 3

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Stevenson, Mark A., Johan C. Faust, Luiza L. Andrade, et al. "Transformation of organic matter in a Barents Sea sediment profile: coupled geochemical and microbiological processes." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2181 (2020): 20200223. http://dx.doi.org/10.1098/rsta.2020.0223.

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Process-based, mechanistic investigations of organic matter transformation and diagenesis directly beneath the sediment–water interface (SWI) in Arctic continental shelves are vital as these regions are at greatest risk of future change. This is in part due to disruptions in benthic–pelagic coupling associated with ocean current change and sea ice retreat. Here, we focus on a high-resolution, multi-disciplinary set of measurements that illustrate how microbial processes involved in the degradation of organic matter are directly coupled with inorganic and organic geochemical sediment properties

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Willian, Nancy, Hilfi Pardi, and Dina Fitriyah. "Colorimetric Detection of Mercury Using Silver Nanoparticles: A Review." BIO Web of Conferences 70 (2023): 01008. http://dx.doi.org/10.1051/bioconf/20237001008.

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Manufacturing nanometals that use natural materials as bioreductant media is still a significant concern due to their environmentally friendly properties. The use of silver nanoparticles prepared using plants or organic materials. They are used for the rapid detection of sustainable mercury ions. The use of these natural materials is capable of producing stable nanoparticles and environmentally friendly nanoparticle synthesis. In this paper, we will report the synthesis of silver nanoparticles with various types of reducers and stabilizers, mechanisms, and nanoparticle characterization for app

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Brostow, Witold, Hamide Ertepinar, and R. P. Singh. "Flow of dilute polymer solutions: chain conformations and degradation of drag reducers." Macromolecules 23, no. 24 (1990): 5109–18. http://dx.doi.org/10.1021/ma00226a013.

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Achmadi, Anggi Pratiwi Sella, and Sarwoko Mangkoedihardjo. "Organic Wastewater-Grey Water Management In The Residential Area." Asian Journal of Engineering, Social and Health 3, no. 2 (2024): 285–90. http://dx.doi.org/10.46799/ajesh.v3i2.238.

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Grey Water wastewater in residential areas near Gisik Cemandi river has a COD value range of 146 – 516 Mg / L and the BOD value is in the range of 76 – 280 Mg / L. While Gisik Cemandi River is included in Class III rivers with COD values of 22 – 31 Mg / L. For the water quality of the Gisik Cemandi river to be maintained and not go down, the residential area must have structured Grey Water wastewater management. The management needed is technical, institutional, and financial management. Technical management planning is carried out by providing recommendations so that residential area has mana

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Balalaiev, Oleksandr. "The role of microbiota in paleoecosystems for forming the molecular profile of coals." E3S Web of Conferences 168 (2020): 00041. http://dx.doi.org/10.1051/e3sconf/202016800041.

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Mass deposits of fossil coals can be formed in certain evolution periods of the Earth’s biosphere, and they are the result of biogeocenosis functioning. A unique combination of ecological factors leads to the emergence of specific biomes with short trophic chains, an imbalance in the carbon cycle and desynchronization in the flows of substance and energy. The molecular structure of coal is a complex conglomerate of various stable organic compounds of primary and secondary metabolites of biogeocenosis reducers. The molecular profile includes numerous classes of lowand high-molecular organic sub

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Dhillon, Ashita, Andreas Teske, Jesse Dillon, David A. Stahl, and Mitchell L. Sogin. "Molecular Characterization of Sulfate-Reducing Bacteria in the Guaymas Basin." Applied and Environmental Microbiology 69, no. 5 (2003): 2765–72. http://dx.doi.org/10.1128/aem.69.5.2765-2772.2003.

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ABSTRACT The Guaymas Basin (Gulf of California) is a hydrothermal vent site where thermal alteration of deposited planktonic and terrestrial organic matter forms petroliferous material which supports diverse sulfate-reducing bacteria. We explored the phylogenetic and functional diversity of the sulfate-reducing bacteria by characterizing PCR-amplified dissimilatory sulfite reductase (dsrAB) and 16S rRNA genes from the upper 4 cm of the Guaymas sediment. The dsrAB sequences revealed that there was a major clade closely related to the acetate-oxidizing delta-proteobacterial genus Desulfobacter a

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Pilipko, Elena Nikolaevna. "Assessment of chemical parameters and group composition of humus of excretory litter of different groups of animals." Samara Journal of Science 13, no. 2 (2024): 67–72. http://dx.doi.org/10.55355/snv2024132107.

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The excrements of various animal groups provide a biological cycle of substances in ecosystems. As a result of the decomposition of undigested residues of organic mass of plant and animal origin, an acceleration of the release (leaching) of nutrients for plants has been revealed, which are again involved in the biological cycle and used by plants to create a new organic mass. The article considers some properties and indicators of animal excrement, conditionally divided by trophic characteristics into phytophagous (moose, white hare), omnivorous (bear, wild boar) and predators (fox, wolf). The

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Delattre, Hadrien, Jing Chen, Matthew J. Wade, and Orkun S. Soyer. "Thermodynamic modelling of synthetic communities predicts minimum free energy requirements for sulfate reduction and methanogenesis." Journal of The Royal Society Interface 17, no. 166 (2020): 20200053. http://dx.doi.org/10.1098/rsif.2020.0053.

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Microbial communities are complex dynamical systems harbouring many species interacting together to implement higher-level functions. Among these higher-level functions, conversion of organic matter into simpler building blocks by microbial communities underpins biogeochemical cycles and animal and plant nutrition, and is exploited in biotechnology. A prerequisite to predicting the dynamics and stability of community-mediated metabolic conversions is the development and calibration of appropriate mathematical models. Here, we present a generic, extendable thermodynamic model for community dyna

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Deng, Milin, Yong Zheng, Zi-Yang He, et al. "Organic carbon negatively affects the diversity of soil nitrous oxide reducers in Chinese fir plantations at a regional scale." Applied Soil Ecology 200 (August 2024): 105457. http://dx.doi.org/10.1016/j.apsoil.2024.105457.

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Li, Jian, Jinsheng Sun, Kaihe Lv, Yuxi Ji, Jintao Ji, and Jingping Liu. "Nano-Modified Polymer Gels as Temperature- and Salt-Resistant Fluid-Loss Additive for Water-Based Drilling Fluids." Gels 8, no. 9 (2022): 547. http://dx.doi.org/10.3390/gels8090547.

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With the continuous exploration and development of oil and gas resources to deep formations, the key treatment agents of water-based drilling fluids face severe challenges from high temperatures and salinity, and the development of high temperature and salt resistance filtration reducers has always been the focus of research in the field of oilfield chemistry. In this study, a nano-silica-modified co-polymer (NS-ANAD) gel was synthesized by using acrylamide, isopropylacrylamide, 2-acrylamide-2-methyl propane sulfonic acid, diallyl dimethyl ammonium chloride, and double-bond-modified inorganic

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Long, Wenjun, Xialei Zhu, Fengshan Zhou, et al. "Preparation and Hydrogelling Performances of a New Drilling Fluid Filtrate Reducer from Plant Press Slag." Gels 8, no. 4 (2022): 201. http://dx.doi.org/10.3390/gels8040201.

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Plant press slag (PPS) containing abundant cellulose and starch is a byproduct in the deep processing of fruits, cereals, and tuberous crops products. PPS can be modified by using caustic soda and chloroacetic acid to obtain an inexpensive and environmentally friendly filtrate reducer of drilling fluids. The optimum mass ratio of mNaOH:mMCA:mPPS is 1:1:2, the optimum etherification temperature is 75 °C, and the obtained product is a natural mixture of carboxymethyl cellulose and carboxymethyl starch (CMCS). PPS and CMCS are characterized by using X-ray diffraction, scanning electron microscopy

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Mahadevan, R., D. R. Bond, J. E. Butler, et al. "Characterization of Metabolism in the Fe(III)-Reducing Organism Geobacter sulfurreducens by Constraint-Based Modeling." Applied and Environmental Microbiology 72, no. 2 (2006): 1558–68. http://dx.doi.org/10.1128/aem.72.2.1558-1568.2006.

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ABSTRACT Geobacter sulfurreducens is a well-studied representative of the Geobacteraceae, which play a critical role in organic matter oxidation coupled to Fe(III) reduction, bioremediation of groundwater contaminated with organics or metals, and electricity production from waste organic matter. In order to investigate G. sulfurreducens central metabolism and electron transport, a metabolic model which integrated genome-based predictions with available genetic and physiological data was developed via the constraint-based modeling approach. Evaluation of the rates of proton production and consu

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Chèneby, D., D. Bru, N. Pascault, P. A. Maron, L. Ranjard, and L. Philippot. "Role of Plant Residues in Determining Temporal Patterns of the Activity, Size, and Structure of Nitrate Reducer Communities in Soil." Applied and Environmental Microbiology 76, no. 21 (2010): 7136–43. http://dx.doi.org/10.1128/aem.01497-10.

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ABSTRACT The incorporation of plant residues into soil not only represents an opportunity to limit soil organic matter depletion resulting from cultivation but also provides a valuable source of nutrients such as nitrogen. However, the consequences of plant residue addition on soil microbial communities involved in biochemical cycles other than the carbon cycle are poorly understood. In this study, we investigated the responses of one N-cycling microbial community, the nitrate reducers, to wheat, rape, and alfalfa residues for 11 months after incorporation into soil in a field experiment. A 20

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Reinhardt, Manuel, Walter Goetz, Jan-Peter Duda, Christine Heim, Joachim Reitner, and Volker Thiel. "Organic signatures in Pleistocene cherts from Lake Magadi (Kenya) – implications for early Earth hydrothermal deposits." Biogeosciences 16, no. 12 (2019): 2443–65. http://dx.doi.org/10.5194/bg-16-2443-2019.

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Abstract. Organic matter in Archean hydrothermal cherts may provide an important archive for molecular traces of the earliest life on Earth. The geobiological interpretation of this archive, however, requires a sound understanding of organic matter preservation and alteration in hydrothermal systems. Here we report on organic matter (including molecular biosignatures) enclosed in hydrothermally influenced cherts of the Pleistocene Lake Magadi (Kenya; High Magadi Beds and Green Beds). The Magadi cherts contain low organic carbon (< 0.4 wt %) that occurs in the form of finely dispersed clots,

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Boyd, Eric S., Rachel K. Lange, Andrew C. Mitchell, et al. "Diversity, Abundance, and Potential Activity of Nitrifying and Nitrate-Reducing Microbial Assemblages in a Subglacial Ecosystem." Applied and Environmental Microbiology 77, no. 14 (2011): 4778–87. http://dx.doi.org/10.1128/aem.00376-11.

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ABSTRACTSubglacial sediments sampled from beneath Robertson Glacier (RG), Alberta, Canada, were shown to harbor diverse assemblages of potential nitrifiers, nitrate reducers, and diazotrophs, as assessed byamoA,narG, andnifHgene biomarker diversity. Although archaealamoAgenes were detected, they were less abundant and less diverse than bacterialamoA, suggesting that bacteria are the predominant nitrifiers in RG sediments. Maximum nitrification and nitrate reduction rates in microcosms incubated at 4°C were 280 and 18.5 nmol of N per g of dry weight sediment per day, respectively, indicating th

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York, Jamie L., Robert H. Magnuson, Dino Camdzic, and Kevin A. Schug. "Characterization of ethoxylated alcohols in friction reducers using matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry." Rapid Communications in Mass Spectrometry 33, no. 15 (2019): 1286–92. http://dx.doi.org/10.1002/rcm.8468.

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Presley, Rachel, and Jane M. Caffrey. "Nitrogen Fixation in Subtropical Seagrass Sediments: Seasonal Patterns in Activity in Santa Rosa Sound, Florida, USA." Journal of Marine Science and Engineering 9, no. 7 (2021): 766. http://dx.doi.org/10.3390/jmse9070766.

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Seagrass beds are important coastal habitats that are diminishing globally. Nitrogen, a key nutrient, often limits seagrass growth. Nitrogen fixation provides new, bioavailable nitrogen to the plants. This study explores its importance and factors controlling rates in sediments colonized by two dominant taxa in Northwest Florida, Thalassia testudinum and Halodule wrightii, compared to unvegetated sediments. We hypothesized that nitrogen fixation rates would be greater in seagrass colonized sediments, particularly during high growth periods. We expected to observe a positive relationship betwee

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Thamdrup, Bo, RamÃ¯Â¿Â½n RossellÃ¯Â¿Â½-Mora, and Rudolf Amann. "Microbial Manganese and Sulfate Reduction in Black Sea Shelf Sediments." Applied and Environmental Microbiology 66, no. 7 (2000): 2888–97. http://dx.doi.org/10.1128/aem.66.7.2888-2897.2000.

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ABSTRACT The microbial ecology of anaerobic carbon oxidation processes was investigated in Black Sea shelf sediments from mid-shelf with well-oxygenated bottom water to the oxic-anoxic chemocline at the shelf-break. At all stations, organic carbon (Corg) oxidation rates were rapidly attenuated with depth in anoxically incubated sediment. Dissimilatory Mn reduction was the most important terminal electron-accepting process in the active surface layer to a depth of ∼1 cm, while SO4 2− reduction accounted for the entire Corg oxidation below. Manganese reduction was supported by moderately high Mn

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Zhang, Xiaojun, Jixiang Guo, Dongtao Fei, et al. "Polymer surfactants as viscosity reducers for ultra-heavy oil: Synthesis and viscosity reduction mechanism." Fuel 357 (February 2024): 129871. http://dx.doi.org/10.1016/j.fuel.2023.129871.

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Blaszczak, Wiktoria, Wojciech Barczak, Julia Masternak, Przemysław Kopczyński, Anatoly Zhitkovich, and Błażej Rubiś. "Vitamin C as a Modulator of the Response to Cancer Therapy." Molecules 24, no. 3 (2019): 453. http://dx.doi.org/10.3390/molecules24030453.

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Ascorbic acid (vitamin C) has been gaining attention as a potential treatment for human malignancies. Various experimental studies have shown the ability of pharmacological doses of vitamin C alone or in combinations with clinically used drugs to exert beneficial effects in various models of human cancers. Cytotoxicity of high doses of vitamin C in cancer cells appears to be related to excessive reactive oxygen species generation and the resulting suppression of the energy production via glycolysis. A hallmark of cancer cells is a strongly upregulated aerobic glycolysis, which elevates its rel

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Nakamura, Shinji, Masahiro Kamaura, Yuichiro Akao, et al. "Discovery of phenylpyrrolidine derivatives as a novel class of retinol binding protein 4 (RBP4) reducers." Bioorganic & Medicinal Chemistry 54 (January 2022): 116553. http://dx.doi.org/10.1016/j.bmc.2021.116553.

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Maltby, Johanna, Lea Steinle, Carolin R. Löscher, et al. "Microbial methanogenesis in the sulfate-reducing zone of sediments in the Eckernförde Bay, SW Baltic Sea." Biogeosciences 15, no. 1 (2018): 137–57. http://dx.doi.org/10.5194/bg-15-137-2018.

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Abstract. Benthic microbial methanogenesis is a known source of methane in marine systems. In most sediments, the majority of methanogenesis is located below the sulfate-reducing zone, as sulfate reducers outcompete methanogens for the major substrates hydrogen and acetate. The coexistence of methanogenesis and sulfate reduction has been shown before and is possible through the usage of noncompetitive substrates by methanogens such as methanol or methylated amines. However, knowledge about the magnitude, seasonality, and environmental controls of this noncompetitive methane production is spars

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Ruzimova, Holida Kamiljanovna, and Novruza Marxamiddin qiz Kobulova. "EFFECT OF "BIST" AND "BIST-M" BIO-PREPARATIONS ON CHANGES IN THE AMOUNT OF NITROGEN, PHOSPHORUS AND POTASSIUM RECEIVED BY PLANTS IN THE SOIL." Journal of biology and ecology 4, no. 2 (2022): 2. https://doi.org/10.5281/zenodo.7482873.

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It has been shown that salinity, which occurs in the case of agricultural practices, occurs when the amount of salts formed in the root system of the plant is low, and the amount of drainage water is low. The problem of low productivity of saline soils is explained not only by the toxicity of salts or the damage of plants by excess salt in the root tissues, but also by the lack of organic and mineral substances, especially N, P and K.

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Charewicz, Witold A., Jerzy Wódka, and Tomasz Chmielewski. "Recovery of rhenium from acidic aqueous solutions by pressure reduction with gaseous reducers." Journal of Chemical Technology & Biotechnology 52, no. 1 (2007): 119–26. http://dx.doi.org/10.1002/jctb.280520109.

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Gier, Jessica, Stefan Sommer, Carolin R. Löscher, Andrew W. Dale, Ruth A. Schmitz, and Tina Treude. "Nitrogen fixation in sediments along a depth transect through the Peruvian oxygen minimum zone." Biogeosciences 13, no. 14 (2016): 4065–80. http://dx.doi.org/10.5194/bg-13-4065-2016.

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Abstract. The potential coupling of nitrogen (N2) fixation and sulfate reduction (SR) was explored in sediments of the Peruvian oxygen minimum zone (OMZ). Sediment samples were retrieved by a multiple corer at six stations along a depth transect (70–1025 m water depth) at 12° S, covering anoxic and hypoxic bottom water conditions. Benthic N2 fixation, determined by the acetylene reduction assay, was detected at all sites, with highest rates between 70 and 253 m and lower rates at greater depth. SR rates decreased with increasing water depth. N2 fixation and SR overlapped in sediments, suggesti

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Bhattacharya, Sabyasachi, Tarunendu Mapder, Svetlana Fernandes, et al. "Sedimentation rate and organic matter dynamics shape microbiomes across a continental margin." Biogeosciences 18, no. 18 (2021): 5203–22. http://dx.doi.org/10.5194/bg-18-5203-2021.

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Abstract. Marine sedimentation rate and bottom-water O2 concentration control organic carbon remineralization and sequestration across continental margins, but whether and how they shape microbiome architecture (the ultimate effector of all biogeochemical phenomena) across shelf and slope sediments is still unclear. Here we reveal distinct microbiome structures and functions, amidst comparable pore fluid chemistries, along 300 cm sediment horizons underlying the seasonal (shallow coastal; water depth: 31 m) and perennial (deep sea; water depths: 530 and 580 m) oxygen minimum zones (OMZs) of th

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