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https://www.readbyqxmd.com/read/28078719/carbon-nanotube-supported-bio-inspired-nickel-catalyst-and-its-integration-in-hybrid-hydrogen-air-fuel-cells
#1
Solène Gentil, Noémie Lalaoui, Arnab Dutta, Yannig Nedellec, Serge Cosnier, Wendy J Shaw, Vincent Artero, Alan Le Goff
A biomimetic nickel bis-diphosphine complex incorporating the amino acid arginine in the outer coordination sphere was immobilized on modified carbon nanotubes (CNTs) through electrostatic interactions. The functionalized redox nanomaterial exhibits reversible electrocatalytic activity for the H2 /2 H(+) interconversion from pH 0 to 9, with catalytic preference for H2 oxidation at all pH values. The high activity of the complex over a wide pH range allows us to integrate this bio-inspired nanomaterial either in an enzymatic fuel cell together with a multicopper oxidase at the cathode, or in a proton exchange membrane fuel cell (PEMFC) using Pt/C at the cathode...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28070595/photosynthetic-microbial-fuel-cells
#2
Joseph A Laureanti, Anne K Jones
This chapter presents the current state of research on bioelectrochemical systems that include phototrophic organisms. First, we describe what is known of how phototrophs transfer electrons from internal metabolism to external substrates. This includes efforts to understand both the source of electrons and transfer pathways within cells. Second, we consider technological progress toward producing bio-photovoltaic devices with phototrophs. Efforts to improve these devices by changing the species included, the electrode surfaces, and chemical mediators are described...
January 10, 2017: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/28062838/enzymes-as-modular-catalysts-for-redox-half-reactions-in-h2-powered-chemical-synthesis-from-biology-to-technology
#3
REVIEW
Holly A Reeve, Philip A Ash, HyunSeo Park, Ailun Huang, Michalis Posidias, Chloe Tomlinson, Oliver Lenz, Kylie A Vincent
The present study considers the ways in which redox enzyme modules are coupled in living cells for linking reductive and oxidative half-reactions, and then reviews examples in which this concept can be exploited technologically in applications of coupled enzyme pairs. We discuss many examples in which enzymes are interfaced with electronically conductive particles to build up heterogeneous catalytic systems in an approach which could be termed synthetic biochemistry We focus on reactions involving the H(+)/H2 redox couple catalysed by NiFe hydrogenase moieties in conjunction with other biocatalysed reactions to assemble systems directed towards synthesis of specialised chemicals, chemical building blocks or bio-derived fuel molecules...
January 15, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28056440/fepo4-based-single-chamber-air-cathode-microbial-fuel-cell-for-online-monitoring-levofloxacin
#4
Libin Zeng, Xinyong Li, Yueran Shi, Yefei Qi, Daqiong Huang, Moses Tadé, Shaobin Wang, Shaomin Liu
A bio-electrochemical strategy was developed for constructing a simple and sensitive levofloxacin (LEV) sensor based on a single chamber microbial fuel cell (SC-MFC) using FePO4 nanoparticles (NPs) as the cathode catalyst instead of traditional Pt/C. In this assembled sensor device, FePO4 NPs dramatically promoted the electrooxidation of oxygen on the cathode, which helps to accelerate the voltage output from SC-MFC and can provide a powerful guarantee for LEV detection. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to fully characterize the FePO4 NPs...
December 9, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28018390/emerging-technologies-for-the-production-of-renewable-liquid-transport-fuels-from-biomass-sources-enriched-in-plant-cell-walls
#5
REVIEW
Hwei-Ting Tan, Kendall R Corbin, Geoffrey B Fincher
Plant cell walls are composed predominantly of cellulose, a range of non-cellulosic polysaccharides and lignin. The walls account for a large proportion not only of crop residues such as wheat straw and sugarcane bagasse, but also of residues of the timber industry and specialist grasses and other plants being grown specifically for biofuel production. The polysaccharide components of plant cell walls have long been recognized as an extraordinarily large source of fermentable sugars that might be used for the production of bioethanol and other renewable liquid transport fuels...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27998785/integrating-microbial-fuel-cells-with-anaerobic-acidification-and-forward-osmosis-membrane-for-enhancing-bio-electricity-and-water-recovery-from-low-strength-wastewater
#6
Jinmeng Liu, Xinhua Wang, Zhiwei Wang, Yuqin Lu, Xiufen Li, Yueping Ren
Microbial fuel cells (MFCs) and forward osmosis (FO) are two emerging technologies with great potential for energy-efficient wastewater treatment. In this study, anaerobic acidification and FO membrane were simultaneously integrated into an air-cathode MFC (AAFO-MFC) for enhancing bio-electricity and water recovery from low-strength wastewater. During a long-term operation of approximately 40 days, the AAFO-MFC system achieved a continuous and relatively stable power generation, and the maximum power density reached 4...
December 10, 2016: Water Research
https://www.readbyqxmd.com/read/27987941/investigation-of-bio-polymer-electrolyte-based-on-cellulose-acetate-ammonium-nitrate-for-potential-use-in-electrochemical-devices
#7
S Monisha, T Mathavan, S Selvasekarapandian, A Milton Franklin Benial, G Aristatil, N Mani, M Premalatha, D Vinoth Pandi
Proton conducting materials create prime interest in electro chemical device development. Present work has been carried out to design environment friendly new biopolymer electrolytes (BPEs) using cellulose acetate (CA) complex with different concentrations of ammonium nitrate (NH4NO3), which have been prepared as film and characterized. The 50mol% CA and 50mol% NH4NO3 complex has highest ionic conductivity (1.02×10(-3)Scm(-1)). Differential scanning calorimetry shows the changes in glass transition temperature depends on salt concentration...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27951709/amphiphilic-polymer-mediators-promoting-electron-transfer-on-bioanodes-with-pqq-dependent-glucose-dehydrogenase
#8
Yasuo Nakashima, Norihiro Mizoshita, Hiromitsu Tanaka, Yuichiro Nakaoki
Redox-active phenazinium salts bonded to amphiphilic polymer backbones are demonstrated to function as high-performance electron-transfer mediators in enzymatic bioanodes applicable to biofuel cells. The redox-active moieties could be easily tethered to the electrodes by physical adsorption of the hydrophobic regions of the polymer backbones onto the electrode surface. On the other hand, long hydrophilic chains were essential to ensure high mobility of the redox-active moieties in aqueous solutions and to enhance their electron-transfer properties...
December 13, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27900581/molecular-dynamics-simulations-of-the-orientation-properties-of-cytochrome-c-on-the-surface-of-single-walled-carbon-nanotubes
#9
Bing Zhang, Jia Xu, Shu-Fan Mo, Jian-Xi Yao, Song-Yuan Dai
Electron transfer between cytochrome c (Cytc) and electrodes can be influenced greatly by the orientation of protein on the surface of the electrodes. In the present study, different initial orientations of Cytc on the surface of five types of single-walled carbon nanotubes (SWNTs), with different diameters and chirality, were constructed. Properties of the orientations of proteins on the surface of these tubes were first investigated through molecular dynamics simulations. It was shown that variations in SWNT diameter do not significantly affect the orientation; however, the chirality of the SWNTs is crucial to the orientation of the heme embedded in Cytc, and the orientation of the protein can consequently be influenced by the heme orientation...
December 2016: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/27878978/elimination-of-power-overshoot-caused-by-electron-depletion-of-limited-anodic-kinetic-at-bio-anode-through-assistance-current-in-microbial-fuel-cell
#10
Bongkyu Kim, Junyeong An, In Seop Chang
The power overshoot generated by electron depletion in microbial fuel cells (MFCs) was characterized in this study. Various causes of power overshoot, identified in previous studies, are discussed in terms of their plausible contributions to electron depletion. We found that power overshoot occurred if the anodic overpotential generated by electron depletion exceeded the cathodic overpotential. The introduction of assistance current from anode connections, which ameliorated the electron depletion in the MFCs, immediately eliminated the power overshoot...
November 22, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27871379/decolourisation-of-acid-orange-7-in-a-microbial-fuel-cell-with-a-laccase-based-biocathode-influence-of-mitigating-ph-changes-in-the-cathode-chamber
#11
Priyadharshini Mani, Taj Keshavarz, T S Chandra, Godfrey Kyazze
Biocathodes may be a suitable replacement of platinum in microbial fuel cells (MFCs) if the cost of MFCs is to be reduced. However, the use of enzymes as bio-cathodes is fraught with loss of activity as time progresses. A possible cause of this loss in activity might be pH increase in the cathode as pH gradients in MFCs are well known. This pH increase is however, accompanied by simultaneous increase in salinity; therefore salinity may be a confounding variable. This study investigated various ways of mitigating pH changes in the cathode of MFCs and their effect on laccase activity and decolourisation of a model azo dye Acid orange 7 in the anode chamber...
January 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/27825877/recent-advances-in-the-development-and-utilization-of-modern-anode-materials-for-high-performance-microbial-fuel-cells
#12
REVIEW
Jayesh M Sonawane, Abhishek Yadav, Prakash C Ghosh, Samuel B Adeloju
Microbial fuel cells (MFCs) are novel bio-electrochemical device for spontaneous or single step conversion of biomass into electricity, based on the use of metabolic activity of bacteria. The design and use of MFCs has attracted considerable interests because of the potential new opportunities they offer for sustainable production of energy from biodegradable and reused waste materials. However, the associated slow microbial kinetics and costly construction materials has limited a much wider commercial use of the technology...
April 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27806676/the-role-of-cell-seeding-bioscaffolds-and-the-in-vivo-microenvironment-in-the-guided-generation-of-osteochondral-composite-tissue
#13
Jiao Wei, Tanja Herrler, Kai Liu, Dong Han, Mei Yang, Chuanchang Dai, Qingfeng Li
Tissue engineering based on cell seeding, bioscaffolds, and growth factors has been widely applied for the reconstruction of tissue defects. Recent progress has fueled in vivo tissue engineering techniques in becoming hot topics in regenerative medicine and reconstructive surgery. To improve the efficacy of tissue engineering, we here investigated the roles of cell seeding, bioscaffolds, growth factors, and in vivo microenvironment (IM) in tissue regeneration. Bone marrow-derived stem cells, allogeneic demineralized bone matrix as bioscaffold, and growth factor bone morphogenetic protein 2/transforming growth factor, and the IM of rib periosteum and perichondrium were used in different combinations for the generation of osteochondral composite tissue...
December 2016: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/27761130/production-strategies-and-applications-of-microbial-single-cell-oils
#14
Katrin Ochsenreither, Claudia Glück, Timo Stressler, Lutz Fischer, Christoph Syldatk
Polyunsaturated fatty acids (PUFAs) of the ω-3 and ω-6 class (e.g., α-linolenic acid, linoleic acid) are essential for maintaining biofunctions in mammalians like humans. Due to the fact that humans cannot synthesize these essential fatty acids, they must be taken up from different food sources. Classical sources for these fatty acids are porcine liver and fish oil. However, microbial lipids or single cell oils, produced by oleaginous microorganisms such as algae, fungi and bacteria, are a promising source as well...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27746307/metabolically-engineered-saccharomyces-cerevisiae-for-branched-chain-ester-productions
#15
Jifeng Yuan, Pranjul Mishra, Chi Bun Ching
Medium branched-chain esters can be used not only as a biofuel but are also useful chemicals with various industrial applications. The development of economically feasible and environment friendly bio-based fuels requires efficient cell factories capable of producing desired products in high yield. Herein, we sought to use a number of strategies to engineer Saccharomyces cerevisiae for high-level production of branched-chain esters. Mitochondrion-based expression of ATF1 gene in a base strain with an overexpressed valine biosynthetic pathway together with expression of mitochondrion-relocalized α-ketoacid decarboxylase (encoded by ARO10) and alcohol dehydrogenase (encoded by ADH7) not only produced isobutyl acetate, but also 3-methyl-1-butyl acetate and 2-methyl-1-butyl acetate...
December 10, 2016: Journal of Biotechnology
https://www.readbyqxmd.com/read/27736793/exploring-hydrogenotrophic-methanogenesis-a-genome-scale-metabolic-reconstruction-of-methanococcus-maripaludis
#16
Matthew A Richards, Thomas J Lie, Juan Zhang, Stephen W Ragsdale, John A Leigh, Nathan D Price
: Hydrogenotrophic methanogenesis occurs in multiple environments, ranging from the intestinal tracts of animals to anaerobic sediments and hot springs. Energy conservation in hydrogenotrophic methanogens was long a mystery; only within the last decade was it reported that net energy conservation for growth depends on electron bifurcation. In this work, we focus on Methanococcus maripaludis, a well-studied hydrogenotrophic marine methanogen. To better understand hydrogenotrophic methanogenesis and compare it with methylotrophic methanogenesis that utilizes oxidative phosphorylation rather than electron bifurcation, we have built iMR539, a genome scale metabolic reconstruction that accounts for 539 of the 1,722 protein-coding genes of M...
December 15, 2016: Journal of Bacteriology
https://www.readbyqxmd.com/read/27687501/co2-fixation-by-anaerobic-non-photosynthetic-mixotrophy-for-improved-carbon-conversion
#17
Shawn W Jones, Alan G Fast, Ellinor D Carlson, Carrissa A Wiedel, Jennifer Au, Maciek R Antoniewicz, Eleftherios T Papoutsakis, Bryan P Tracy
Maximizing the conversion of biogenic carbon feedstocks into chemicals and fuels is essential for fermentation processes as feedstock costs and processing is commonly the greatest operating expense. Unfortunately, for most fermentations, over one-third of sugar carbon is lost to CO2 due to the decarboxylation of pyruvate to acetyl-CoA and limitations in the reducing power of the bio-feedstock. Here we show that anaerobic, non-photosynthetic mixotrophy, defined as the concurrent utilization of organic (for example, sugars) and inorganic (for example, CO2) substrates in a single organism, can overcome these constraints to increase product yields and reduce overall CO2 emissions...
2016: Nature Communications
https://www.readbyqxmd.com/read/27684325/laboratory-production-of-biofuels-and-biochemicals-from-a-rapeseed-oil-through-catalytic-cracking-conversion
#18
Siauw H Ng, Yu Shi, Nicole E Heshka, Yi Zhang, Edward Little
The work is based on a reported study which investigates the processability of canola oil (bio-feed) in the presence of bitumen-derived heavy gas oil (HGO) for production of transportation fuels through a fluid catalytic cracking (FCC) route. Cracking experiments are performed with a fully automated reaction unit at a fixed weight hourly space velocity (WHSV) of 8 hr(-1), 490-530 °C, and catalyst/oil ratios of 4-12 g/g. When a feed is in contact with catalyst in the fluid-bed reactor, cracking takes place generating gaseous, liquid, and solid products...
2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27681904/aspergillus-oryzae-saccharomyces-cerevisiae-consortium-allows-bio-hybrid-fuel-cell-to-run-on-complex-carbohydrates
#19
Justin P Jahnke, Thomas Hoyt, Hannah M LeFors, James J Sumner, David M Mackie
Consortia of Aspergillus oryzae and Saccharomyces cerevisiae are examined for their abilities to turn complex carbohydrates into ethanol. To understand the interactions between microorganisms in consortia, Fourier-transform infrared spectroscopy is used to follow the concentrations of various metabolites such as sugars (e.g., glucose, maltose), longer chain carbohydrates, and ethanol to optimize consortia conditions for the production of ethanol. It is shown that with proper design A. oryzae can digest food waste simulants into soluble sugars that S...
February 4, 2016: Microorganisms
https://www.readbyqxmd.com/read/27557613/recent-advances-in-engineering-propionyl-coa-metabolism-for-microbial-production-of-value-added-chemicals-and-biofuels
#20
Kajan Srirangan, Mark Bruder, Lamees Akawi, Dragan Miscevic, Shane Kilpatrick, Murray Moo-Young, C Perry Chou
Diminishing fossil fuel reserves and mounting environmental concerns associated with petrochemical manufacturing practices have generated significant interests in developing whole-cell biocatalytic systems for the production of value-added chemicals and biofuels. Although acetyl-CoA is a common natural biogenic precursor for the biosynthesis of numerous metabolites, propionyl-CoA is unpopular and non-native to most organisms. Nevertheless, with its C3-acyl moiety as a discrete building block, propionyl-CoA can serve as another key biogenic precursor to several biological products of industrial importance...
August 25, 2016: Critical Reviews in Biotechnology
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