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https://www.readbyqxmd.com/read/28535471/graphene-oxide-supported-carbon-nanofiber-like-network-derived-from-polyaniline-a-novel-composite-for-enhanced-glucose-oxidase-bioelectrode-performance
#1
Zepeng Kang, Kailong Jiao, Xinping Xu, Ruiyun Peng, Shuqiang Jiao, Zongqian Hu
A three-dimensional architecture of PANI@GO hybrid was synthesized via in-situ polymerization of aniline monomers on the surface of graphene oxide (GO) and carbonized at 1600°C. The SEM images showed that surfaces of planar GO were covered by a compact nanofiber-like polyaniline (PANI) layer which presented an interconnected network. Nanofiber-like PANI on the GO surface was mostly preserved and became the carbon nanofibers (CNFs) after carbonization. The TEM images showed that the carbonized PANI grew seamlessly on the GO surface and served as conductive "network" between interlayers of GO...
May 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28535030/sulfonated-holey-graphene-oxide-shgo-filled-sulfonated-poly-ether-ether-ketone-membrane-the-role-of-holes-in-the-shgo-in-improving-its-performance-as-proton-exchange-membrane-for-direct-methanol-fuel-cells
#2
Zhong-Jie Jiang, Zhongqing Jiang, Xiaoning Na Tian, Lijuan Luo, Meilin Liu
Sulfonated holey graphene oxides (SHGOs) have synthesized by the etching of sulfonated graphene oxides with concentrated HNO3 under the assistance of ultrasonication. These SHGOs could be used as the fillers for the sulfonated aromatic poly(ether ether ketone) (SPEEK) membrane. The obtained SHGO incorporated SPEEK membrane has a uniform and dense structure, exhibiting the higher performance as proton exchange membranes (PEMs), for instance, higher proton conductivity, lower activation energy for proton conduction, and comparable methanol permeability, as compared to Nafion® 112...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534609/au-promoted-nickel-iron-layered-double-hydroxide-nanoarrays-a-modular-catalyst-enabling-high-performance-oxygen-evolution
#3
Wenxin Zhu, Lizhi Liu, Zhihao Yue, Wentao Zhang, Xiaoyue Yue, Jing Wang, Shaoxuan Yu, Li Wang, Jianlong Wang
Oxygen evolution reaction (OER) has played a pivotal role in many energy conversion and storage technologies like water electrolysis, fuel cells, and metal-air batteries. However, the slow kinetics of OER limit the performance and commercialization of such devices. Herein, we report on NiFe LDH@Au hybrid nanoarrays on Ni foam for much enhanced OER. By hybridization of electronegative Au and NiFe LDH with intrinsic remarkable OER catalytic activity, this modular electrode could drive an overall ultrahigh-performance and robust OER in base with the demand of overpotentials of only 221, 235 and 270 mV to afford 50, 100 and 500 mA cm-2, respectively...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530403/propitious-dendritic-cu2o%C3%AF-pt-nanostructured-anodes-for-direct-formic-acid-fuel-cells
#4
Gumaa A El-Nagar, Ahmad M Mohammad, Mohamed S El-Deab, Bahgat E El-Anadouli
This study introduces a novel competent dendritic copper oxide-platinum nanocatalyst (nano-Cu2O-Pt) immobilized onto a glassy carbon (GC) substrate for formic acid (FA) electrooxidation (FAO); the prime reaction in the anodic compartment of direct formic acid fuel cells (DFAFCs). Interestingly, the proposed catalyst exhibited an outstanding improvement for FAO compared to the traditional platinum nanoparticles (nano-Pt) modified GC (nano-Pt/GC) catalyst. This was evaluated from steering the reaction mechanism towards the desired direct route producing carbon dioxide (CO2); consistently with mitigating the other undesired indirect pathway producing carbon monoxide (CO); the potential poison deteriorating the catalytic activity of typical Pt-based catalysts...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28528426/building-a-bio-based-industry-in-the-middle-east-through-harnessing-the-potential-of-the-red-sea-biodiversity
#5
REVIEW
Jens Nielsen, John Archer, Magbubah Essack, Vladimir B Bajic, Takashi Gojobori, Ivan Mijakovic
The incentive for developing microbial cell factories for production of fuels and chemicals comes from the ability of microbes to deliver these valuable compounds at a reduced cost and with a smaller environmental impact compared to the analogous chemical synthesis. Another crucial advantage of microbes is their great biological diversity, which offers a much larger "catalog" of molecules than the one obtainable by chemical synthesis. Adaptation to different environments is one of the important drives behind microbial diversity...
May 20, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28527885/maintenance-of-atp-homeostasis-triggers-metabolic-shifts-in-gas-fermenting-acetogens
#6
Kaspar Valgepea, Renato de Souza Pinto Lemgruber, Kieran Meaghan, Robin William Palfreyman, Tanus Abdalla, Björn Daniel Heijstra, James Bruce Behrendorff, Ryan Tappel, Michael Köpke, Séan Dennis Simpson, Lars Keld Nielsen, Esteban Marcellin
Acetogens are promising cell factories for producing fuels and chemicals from waste feedstocks via gas fermentation, but quantitative characterization of carbon, energy, and redox metabolism is required to guide their rational metabolic engineering. Here, we explore acetogen gas fermentation using physiological, metabolomics, and transcriptomics data for Clostridium autoethanogenum steady-state chemostat cultures grown on syngas at various gas-liquid mass transfer rates. We observe that C. autoethanogenum shifts from acetate to ethanol production to maintain ATP homeostasis at higher biomass concentrations but reaches a limit at a molar acetate/ethanol ratio of ∼1...
May 16, 2017: Cell Systems
https://www.readbyqxmd.com/read/28526899/electricity-generation-from-real-industrial-wastewater-using-a-single-chamber-air-cathode-microbial-fuel-cell-with-an-activated-carbon-anode
#7
Hend Omar Mohamed, M Obaid, Enas Taha Sayed, Yang Liu, Jinpyo Lee, Mira Park, Nasser A M Barakat, Hak Yong Kim
This study introduces activated carbon (AC) as an effective anode for microbial fuel cells (MFCs) using real industrial wastewater without treatment or addition of external microorganism mediators. Inexpensive activated carbon is introduced as a proper electrode alternative to carbon cloth and carbon paper materials, which are considered too expensive for the large-scale application of MFCs. AC has a porous interconnected structure with a high bio-available surface area. The large surface area, in addition to the high macro porosity, facilitates the high performance by reducing electron transfer resistance...
May 19, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28526709/acetylation-of-mitochondrial-proteins-by-gcn5l1-promotes-enhanced-fatty-acid-oxidation-in-the-heart
#8
Dharendra Thapa, Manling Zhang, Janet R Manning, Danielle Guimarães, Michael Stoner, Robert M O'Doherty, Sruti Shiva, Iain Scott
Lysine acetylation is a reversible post-translational modification, and is particularly important in the regulation of mitochondrial metabolic enzymes. Acetylation uses acetyl-CoA derived from fuel metabolism as a co-factor, thereby linking nutrition to metabolic activity. In this study, we investigated how mitochondrial acetylation status in the heart is controlled by food intake, and how these changes affect mitochondrial metabolism. We found that there was a significant increase in cardiac mitochondrial protein acetylation in mice fed a long-term high fat diet, and that this change correlated with an increase in the abundance of the mitochondrial acetyltransferase-related protein GCN5L1...
May 19, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28525870/effective-swine-wastewater-treatment-by-combining-microbial-fuel-cells-with-flocculation
#9
Weijun Ding, Shaoan Cheng, Liliang Yu, Haobin Huang
Microbial fuel cells (MFCs) provide a cost-effective method for treating swine wastewater treatment and simultaneously producing electricity, yet they need to be combined with other wastewater treatment processes to improve the effluent water quality. In this paper, we constructed single-chamber air-cathode MFCs with a compact configuration for nitrogen and COD removal and high electricity production and combined them with a low-cost flocculation process to discharge higher quality wastewater. We show that MFCs could remove ammonia at a rate of 269...
May 16, 2017: Chemosphere
https://www.readbyqxmd.com/read/28525391/titanium-dioxide-nanowire-sensor-array-integration-on-cmos-platform-using-deterministic-assembly
#10
Oren Gall, Xiahua Zhong, Daniel Schulman, Myungkoo Kang, Ali Razavieh, Theresa Mayer
Nanosensor arrays have recently received significant attention due to their utility in a wide range of applications, including gas sensing, fuel cells, internet of things (IoT), and portable health monitoring systems. Less attention has been given to the production of sensor platforms in the µW range for ultra-low power applications. Here, we discuss how to scale the nanosensor energy demand by developing a process for integration of nanowire sensing arrays on a monolithic CMOS chip. This work demonstrates an off-chip nanowire fabrication method; subsequently nanowires link to a fused SiO2 substrate using electric-field assisted directed assembly...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28524919/micro-nanomotors-towards-in-vivo-application-cell-tissue-and-biofluid
#11
REVIEW
Fei Peng, Yingfeng Tu, Daniela A Wilson
Inspired by highly efficient natural motors, synthetic micro/nanomotors are self-propelled machines capable of converting the supplied fuel into mechanical motion. A significant advance has been made in the construction of diverse motors over the last decade. These synthetic motor systems, with rapid transporting and efficient cargo towing abilities, are expected to open up new horizons for various applications. Utilizing emergent motor platforms for in vivo applications is one important aspect receiving growing interest as conventional therapeutic methodology still remains limited for cancer, heart, or vasculature diseases...
May 19, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28523861/a-bifunctional-hybrid-electrocatalyst-for-oxygen-reduction-and-evolution-cobalt-oxide-nanoparticles-strongly-coupled-to-b-n-decorated-graphene
#12
Yun Tong, Pengzuo Chen, Tianpei Zhou, Kun Xu, Wangsheng Chu, Changzheng Wu, Yi Xie
The electrocatalyzed oxygen reduction and evolution reactions (ORR and OER, respectively) are the core components of many energy conversion systems, including water splitting, fuel cells, and metal-air batteries. Rational design of highly efficient non-noble materials as bifunctional ORR/OER electrocatalysts is of great importance for large-scale practical applications. A new strongly coupled hybrid material is presented, which comprises CoOx nanoparticles rich in oxygen vacancies grown on B,N-decorated graphene (CoOx NPs/BNG) and operates as an efficient bifunctional OER/ORR electrocatalyst...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28521081/thermophysical-and-electrochemical-properties-of-ethereal-functionalised-cyclic-alkylammonium-based-ionic-liquids-as-potential-electrolytes-for-electrochemical-applications
#13
Alex Ryan Neale, Sinead Murphy, Peter Goodrich, Christopher Hardacre, Johan Jacquemin
A series of hydrophobic room temperature ionic liquids (ILs) based on ethereal functionalised pyrrolidinium, piperidinium and azepanium cations bearing the bis{(trifluoromethyl)sulfonyl}imide, [TFSI]-, anion were synthesized and characterized. Their physicochemical properties such as density, viscosity and electrical conductivity and thermal properties including phase transition behaviour and decomposition temperature have been measured. All of the ILs showed low melting point, low viscosity and good conductivity and the latter properties have been discussed in terms of the IL fragility, an important electrolyte feature of the transport properties of glassy-forming ILs...
May 18, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28520964/proviral-latency-persistent-human-immunodeficiency-virus-infection-and-the-development-of-latency-reversing-agents
#14
David M Margolis, Nancie M Archin
Quiescent proviral genomes that persist during human immunodeficiency virus type 1 (HIV-1) infection despite effective antiretroviral therapy (ART) can fuel rebound viremia after ART interruption and is a central obstacle to the cure of HIV infection. The induction of quiescent provirus is the goal of a new class of potential therapeutics, latency reversing agents (LRAs). The discovery, development, and testing of HIV LRAs is a key part of current efforts to develop latency reversal and viral clearance strategies to eradicate established HIV infection...
March 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28520413/temporal-characteristics-of-brown-carbon-over-the-central-indo-gangetic-plain
#15
Rangu Venkata Satish, Puthukkadan Moosakutty Shamjad, Navaneeth M Thamban, Sachchida N Tripathi, Neeraj Rastogi
Recent global models estimate that light absorption by brown carbon (BrC) in several regions of the world is ~30-70% of that due to black carbon (BC). It is, therefore, important to understand its sources and characteristics on temporal and spatial scale. In this study, we conducted semi-continuous measurements of water-soluble organic carbon (WSOC) and BrC using particle-into-liquid sampler coupled with liquid waveguide capillary cell and total carbon analyzer (PILS-LWCC-TOC) over Kanpur (26.5°N, 80.3°E, 142 m amsl) during a winter season (December 2015 to February 2016)...
May 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28520196/environmentally-friendly-recycling-of-fuel-cell-s-membrane-electrode-assembly-using-ionic-liquids
#16
Sophie Legeai, Maxime Balva, Nathalie Leclerc, Emmanuel Billy, Eric Meux
The platinum nanoparticles used as catalyst in Proton Exchange Membrane Fuel Cells (PEMFCs) could represent around 46 % of the total price of the cells1 for a large scale production which is one of the limitation of their commercialization. The recycling of this platinum catalyst can then be the best alternative to limit the production cost of PEMFCs. Usual recovery routes for spent catalysts containing platinum are pyro-hydrometallurgical processes in which a calcination step is followed by aqua regia treatment, generating fumes and NOx emission, respectively...
May 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28516063/modulation-of-ca-2-signaling-by-anti-apoptotic-b-cell-lymphoma-2-proteins-at-the-endoplasmic-reticulum-mitochondrial-interface
#17
REVIEW
Tim Vervliet, Eva Clerix, Bruno Seitaj, Hristina Ivanova, Giovanni Monaco, Geert Bultynck
Mitochondria are important regulators of cell death and cell survival. Mitochondrial Ca(2+) levels are critically involved in both of these processes. On the one hand, excessive mitochondrial Ca(2+) leads to Ca(2+)-induced mitochondrial outer membrane permeabilization and thus apoptosis. On the other hand, mitochondria need Ca(2+) in order to efficiently fuel the tricarboxylic acid cycle and maintain adequate mitochondrial bioenergetics. For obtaining this Ca(2+), the mitochondria are largely dependent on close contact sites with the endoplasmic reticulum (ER), the so-called mitochondria-associated ER membranes...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28515572/a-family-of-fe-n-c-oxygen-reduction-electrocatalysts-for-microbial-fuel-cell-mfc-application-relationships-between-surface-chemistry-and-performances
#18
Carlo Santoro, Alexey Serov, Rohan Gokhale, Santiago Rojas-Carbonell, Lydia Stariha, Jonathan Gordon, Kateryna Artyushkova, Plamen Atanassov
Different iron-based cathode catalysts have been studied for oxygen reduction reaction (ORR) in neutral media and then applied into microbial fuel cells (MFC). The catalysts have been synthesized using sacrificial support method (SSM) using eight different organic precursors named Niclosamide, Ricobendazole, Guanosine, Succinylsulfathiazole, Sulfacetamide, Quinine, Sulfadiazine and Pyrazinamide. Linear Sweep Voltammetry (LSV) curves were obtained for the catalysts using a O2 saturated in 0.1 M potassium phosphate buffer and 0...
May 15, 2017: Applied Catalysis. B, Environmental
https://www.readbyqxmd.com/read/28515381/preliminary-evaluation-of-glyceric-acid-producing-ability-of-acidomonas-methanolica-nbrc104435-from-glycerol-containing-methanol
#19
Shun Sato, Dai Kitamoto, Hiroshi Habe
Some acetic acid bacteria produce large amounts of glyceric acid (GA) from glycerol in culture broth. However, methanol, which is a major contaminant of raw glycerol derived from the biodiesel fuel industry, sharply decreases cell growth and GA production [AMB Express, 3, 20, 2013]. Thus, we evaluated the methylotrophic acetic acid bacterium Acidomonas methanolica NBRC104435 for its ability to produce GA from glycerol containing methanol. This strain accumulated GA in its culture broth when 1-3 wt% glycerol was available as a carbon source...
May 17, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28515169/osmoregulation-bioenergetics-and-oxidative-stress-in-coastal-marine-invertebrates-raising-the-questions-for-future-research
#20
REVIEW
Georgina A Rivera-Ingraham, Jehan-Hervé Lignot
Osmoregulation is by no means an energetically cheap process, and its costs have been extensively quantified in terms of respiration and aerobic metabolism. Common products of mitochondrial activity are reactive oxygen and nitrogen species, which may cause oxidative stress by degrading key cell components, while playing essential roles in cell homeostasis. Given the delicate equilibrium between pro- and antioxidants in fueling acclimation responses, the need for a thorough understanding of the relationship between salinity-induced oxidative stress and osmoregulation arises as an important issue, especially in the context of global changes and anthropogenic impacts on coastal habitats...
May 15, 2017: Journal of Experimental Biology
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