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https://www.readbyqxmd.com/read/28926915/bioelectrochemical-methane-ch4-production-in-anaerobic-digestion-at-different-supplemental-voltages
#1
Kwang-Soon Choi, Sanath Kondaveeti, Booki Min
Microbial electrolysis cells (MECs) at various cell voltages (0.5, 0.7 1.0 and 1.5V) were operated in anaerobic fermentation. During the start-up period, the cathode potential decreased from -0.63 to -1.01V, and CH4 generation increased from 168 to 199ml. At an applied voltage of 1.0V, the highest methane yields of 408.3ml CH4/g COD glucose was obtained, which was 30.3% higher than in the control tests (313.4ml CH4/g COD glucose). The average current of 5.1mA was generated at 1.0V at which the maximum methane yield was obtained...
September 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28925584/quorum-sensing-improves-current-output-with-acidithiobacillus-ferrooxidans
#2
Nicolas Chabert, Violaine Bonnefoy, Wafa Achouak
Acidithiobacillus ferrooxidans is a strict acidophilic chemolithoautotrophic bacterium that obtains its energy from reduced inorganic sulfur species or ferrous iron oxidation under aerobic conditions. Carbon felt electrodes were pre-colonized by A. ferrooxidansATCC 23270(T) using ferrous iron or sulfur as electron donors, via the addition (or not) of a mixture of C14 acyl-homoserine lactones (C14-AHLs). Electrode coverage during pre-colonization was sparse regardless of the electron donor source, whereas activation of quorum sensing significantly enhanced it...
September 19, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28923734/biomass-derived-hierarchically-porous-and-heteroatom-doped-carbons-for-supercapacitors
#3
Xiaonan Kang, Hui Zhu, Chuanyi Wang, Kang Sun, Jiao Yin
In this research, Rapeseed dregs (RDs), as a byproduct of agriculture (derived from processing of rapeseed for oil production), were originally employed asa new carbonaceous precursor to synthesize hierarchically porous and heteroatom-doped activated carbons (ACs) with the activation of ZnCl2 at various high temperatures. A variety of measurements have been adopted to systemically characterize the RD-derived ACs. The micro-morphology, pore structures and surface chemistry property were fully investigated by SEM, TEM, XRD, Raman, N2 adsorption-desorption analysis, XPS and IR, respectively...
September 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923558/highly-selective-and-sensitive-sensor-based-on-an-organic-electrochemical-transistor-for-the-detection-of-ascorbic-acid
#4
Lijun Zhang, Guiheng Wang, Di Wu, Can Xiong, Lei Zheng, Yunsheng Ding, Hongbo Lu, Guobing Zhang, Longzhen Qiu
In this study, an organic electrochemical transistor sensor (OECT) with a molecularly imprinted polymer (MIP)-modified gate electrode was prepared for the detection of ascorbic acid (AA). The combination of the amplification function of an OECT and the selective specificity of MIPs afforded a highly sensitive, selective OECT sensor. Cyclic voltammetry and electrochemical impedance spectroscopy measurements were carried out to monitor the stepwise fabrication of the modified electrodes and the adsorption capacity of the MIP/Au electrodes...
September 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28922508/single-oxidative-collision-events-of-silver-nanoparticles-understanding-the-rate-determining-chemistry
#5
Kamonwad Ngamchuea, Richard O D Clark, Stanislav V Sokolov, Neil P Young, Christopher Batchelor-McAuley, Richard G Compton
The oxidative dissolution of citrate-capped silver nanoparticles (AgNPs) is investigated herein by two electrochemical techniques: nano-impacts and anodic stripping voltammetry. Nano-impacts or single nanoparticle-electrode collisions allow the detection of individual nanoparticles. The technique offers an advantage over surface-immobilized methods such as anodic stripping voltammetry as it eliminates the effects of particle agglomeration/ aggregation. The electrochemical studies are performed in different electrolytes (KNO3, KCl, KBr and KI) at varied concentrations ( 20 mM)...
September 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28920993/cobalt-ii-containing-liquid-metal-salts-for-electrodeposition-of-cobalt-and-electrochemical-nanoparticle-formation
#6
Jeroen Sniekers, Pieter Geysens, João C Malaquías, Tom Vander Hoogerstraete, Luc Van Meervelt, Jan Fransaer, Koen Binnemans
Cobalt(ii)-containing liquid metal salts (LMS) with N-alkylimidazole ligands and bis(trifluoromethanesulfonyl)imide (bistriflimide, Tf2N(-)) or methanesulfonate (mesylate, OMs(-)) anions were synthesized and characterized. The chain length of the alkyl side chain on the imidazole ligand was varied. All compounds were characterized using CHN analysis, DSC and FTIR measurements. Single-crystal X-ray diffraction measurements were performed on six of the compounds for which single crystals of good quality could be obtained...
September 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28920989/half-sandwich-ru-ii-acylthiourea-complexes-dna-hsa-binding-anti-migration-and-cell-death-in-a-human-breast-tumor-cell-line
#7
Legna Colina-Vegas, Liany Luna-Dulcey, Ana M Plutín, Eduardo E Castellano, Marcia R Cominetti, Alzir A Batista
Organometallic ruthenium complexes as potential anticancer agents have been explored due to their suitable properties, such as stability in the solid state and in solution, water solubility and low toxicity. In this study, eight metal complexes of this class were synthesized, characterized and their important biological activities against a human breast tumor cell line (MDA-MB-231) were studied. Complexes 1-8 were obtained in good yields and have been characterized by satisfactory elemental analyses, IR, 1D and 2D (1)H and (13)C{(1)H} NMR, UV-Vis spectroscopy, cyclic voltammetry, ESI-MS and X-ray diffractometry (1, 2, 3 and 6)...
September 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28920905/electrochemical-impedance-spectroscopy-on-interdigitated-gold-microelectrodes-for-glycosylated-human-serum-albumin-characterization
#8
Nadra Bohli, Hanen Chammem, Olivier Meilhac, Laurence Mora, Adnane Abdelghani
Glycosylated albumin is considered as a potentially accurate indicator of shorter-term average glucose concentration compared to the current standard HbA1c and as such, it's attracting the interest of the scientific community as a possible diagnosis marker for diabetic patients. The purpose of this paper is to achieve a better understanding of the glycation effect of albumin on its electrochemical properties. That is done through the use of Interdigitated gold microelectrodes (IDGE) as support in a label free impedimetric immunosensor for detection of human serum albumin detection in glycated (GA) and non-glycated (HSA) form...
September 14, 2017: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/28920436/rational-design-of-solution-processed-ti-fe-o-ternary-oxides-for-efficient-planar-ch3nh3pbi3-perovskite-solar-cells-with-suppressed-hysteresis
#9
Xin Li, Feng Hao, Xingyue Zhao, Xuewen Yin, Zhibo Yao, Ying Guo, Heping Shen, Hong Lin
Electron extraction layer (EEL) plays a critical role in organometal-halide perovskite solar cells (PSCs) by determining the charge extraction and ultimately their power conversion efficiencies. Here, Ti-Fe-O ternary oxide was firstly demonstrated as an efficient EEL candidate in the planar PSC, showing superiority in multiple aspects including the intrinsic precursor stability, coverage on the substrates, electrical properties, and energy levels compared to the widely used TiOx and the pure FeOx. By varying Fe content from 0% to 100% in the Ti-Fe-O composite, the conductivities of the resultant compact layers were markedly improved, according to consistent results from conductive atomic force microscopy (CAFM) and linear sweep voltammetry (LSV) measurements...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920424/nanotubular-iridium-cobalt-mixed-oxide-crystalline-architectures-inherited-from-cobalt-oxide-for-highly-efficient-oxygen-evolution-reaction-catalysis
#10
Areum Yu, Chongmok Lee, Myung Hwa Kim, Youngmi Lee
We report the unique transformation of one-dimensional tubular mixed oxide nanocomposites of iridium (Ir) and cobalt (Co) denoted as IrxCo1-xOy, where x is the relative Ir atomic content to the overall metal content. The formation of a variety of IrxCo1-xOy (0 ≤ x ≤ 1) crystalline tubular nanocomposites was readily achieved by electrospinning and subsequent calcination process. Structural characterizations clearly confirmed that IrxCo1-xOy polycrystalline nanocomposites had a tubular morphology consisting of Ir/IrO2 and Co3O4; and Ir, Co and O were homogeneously distributed throughout the entire nanostructures...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28919429/electrochemical-synthesis-of-ferrate-vi-using-sponge-iron-anode-and-oxidative-transformations-of-antibiotic-and-pesticide
#11
Xuhui Sun, Kexin Zu, He Liang, Lin Sun, Lingyun Zhang, Chuanyi Wang, Virender K Sharma
Passivation of anode is a main challenge in the electrochemical synthesis of ferrate(VI) (Fe(VI)O4(2-), Fe(VI)). A series of electrochemical approaches were employed including polarization curve, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS) to analyze the physicochemical processes involved in electrochemical synthesis of Fe(VI) using sponge iron and cast iron anodes. The results demonstrate that the sponge iron anode achieved higher yield of Fe(VI) compared to grey cast iron anode. The optimum condition to generate Fe(VI) using sponge iron was 35-50°C and 30mA/cm(2)...
September 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28918253/deep-brain-stimulation-of-the-medial-forebrain-bundle-elevates-striatal-dopamine-concentration-without-affecting-spontaneous-or-reward-induced-phasic-release
#12
Marianne Klanker, Matthijs Feenstra, Ingo Willuhn, Damiaan Denys
Deep brain stimulation (DBS) of the medial forebrain bundle (MFB) induces rapid improvement of depressive symptoms in patients suffering from treatment-refractory major depressive disorder. It has been hypothesized that activation of the dopamine (DA) system contributes to this effect. To investigate whether DBS in the MFB affects DA release in the striatum, we combined DBS with fast-scan cyclic voltammetry (FSCV) in freely moving rats. Animals were implanted with a stimulating electrode at the border of the MFB and the ventral tegmental area, and a FSCV microelectrode in the ventromedial striatum to monitor extracellular DA during the acute onset of DBS and subsequent continued stimulation...
September 13, 2017: Neuroscience
https://www.readbyqxmd.com/read/28917810/nano-hemoglobin-film-based-sextet-state-biomemory-device-by-cross-linked-photosensitive-hapten-monomer
#13
Remziye Güzel, Arzu Ersöz, Recep Ziyadanoğulları, Rıdvan Say
In this study, a biomemory device, consisting of hemoglobin (Hb) cross-linked by MACys-Ru(bipyr)2-MACys) photosensitive monomer cross-linkers, which have memory effect through both Ru(3+/2+) in hapten monomer and Fe(3+/2+) in redox active center of Hb through multi-charge transfer mechanism, has been improved. Cyclic voltammetry (CV) has been used to determine the redox property of the Hb cross-linked MACys-Ru(bipyr)2-MACys) hapten. Three memory functions, writing, reading and erasing of the fabricated biomemory device, have been accomplished by chronoamperometry (CA) and open-circuit potential amperometry (OCPA)...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917800/%C3%AE-cyclodextrins-incorporated-multi-walled-carbon-nanotubes-modified-electrode-for-the-voltammetric-determination-of-the-pesticide-dichlorophen
#14
Karolina Sipa, Mariola Brycht, Andrzej Leniart, Paweł Urbaniak, Agnieszka Nosal-Wiercińska, Bartłomiej Pałecz, Sławomira Skrzypek
In this work, a glassy carbon electrode modified with β-cyclodextrins and multi-walled carbon nanotubes (β-CDs/MWCNTs/GCE) was constructed and applied for the square-wave adsorptive stripping voltammetric (SWAdSV) determination of the pesticide dichlorophen (Dcp). For the first time, this compound was electrochemically investigated. The voltammetric measurements were conducted in phosphate buffer (PBS) at pH 6.5 as a supporting electrolyte, and SWAdSV technique parameters were optimized. A linear calibration curve in the wide concentration range from 5...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917799/a-reagentless-and-reusable-electrochemical-aptamer-based-sensor-for-rapid-detection-of-ampicillin-in-complex-samples
#15
Zhi-Gang Yu, Rebecca Y Lai
We report the design and fabrication of a "signal-on" electrochemical aptamer-based (E-AB) sensor for detection of ampicillin. The signaling of the sensor is based on target binding-induced changes in the conformation and flexibility of the methylene blue-modified aptamer probe. The sensor's response is fast; signal saturation can be reached in ~ 200s. Since all the sensor components are surface-immobilized, it is regenerable and can be reused for at least three times. It has demonstrated good specificity and is capable of differentiating between ampicillin and structurally similar antibiotics such as amoxicillin...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917783/intellectual-modifying-a-bare-glassy-carbon-electrode-to-fabricate-a-novel-and-ultrasensitive-electrochemical-biosensor-application-to-determination-of-acrylamide-in-food-samples
#16
Kambiz Varmira, Omid Abdi, Mohammad-Bagher Gholivand, Hector C Goicoechea, Ali R Jalalvand
Acrylamide (AA) is a neurotoxin and carcinogen which is mainly formed in foods containing large quantities of starch processed at high temperatures and its determination is very important to control the quality of foods. In this work, a novel electrochemical biosensor based on hemoglobin-dimethyldioctadecylammonium bromide (HG-DDAB)/platinum-gold-palladium three metallic alloy nanoparticles (PtAuPd NPs)/chitosan-1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (Ch-IL)/multiwalled carbon nanotubes-IL (MWCNTs-IL)/glassy carbon electrode (GCE) is proposed for ultrasensitive determination of AA in food samples...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917761/graphene-nanoribbon-fept-bimetallic-nanoparticles-uric-acid-as-a-novel-magnetic-sensing-layer-of-screen-printed-electrode-for-sensitive-determination-of-ampyra
#17
Pegah Hashemi, Hasan Bagheri, Abbas Afkhami, Salimeh Amidi, Tayyebeh Madrakian
A novel electrochemical sensor for sensitive determination of ampyra (Am) based on graphene nanoribbons modified by iron-platinum bimetallic nanoparticles and uric acid (SPCE/FePtGNR/UA) dropped on the screen-printed carbon electrode (SPCE) surface and magnetically captured onto an SPCE working electrode surface is reported in the present work. The modified nanocomposite and sensing layer was characterized by different techniques, including cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray powdered diffraction (XRD)...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28916435/a-novel-electrochemical-immunosensor-based-on-ito-modified-by-carboxyl-ended-silane-agent-for-ultrasensitive-detection-of-mage-1-in-human-serum
#18
Aslı Gündoğdu, Elif Burcu Aydın, Mustafa Kemal Sezgintürk
A new, low-cost electrochemical immunosensor was developed for rapid detection of Melanoma-associated antigen 1 (MAGE-1), a cancer biomarker. The fabrication procedure of immunosensor was based on the covalent immobilization of anti-MAGE-1, biorecognition molecule, on ITO electrode by carboxyethylsilanetriol (CTES) monolayer. The biosensing MAGE-1 antigen was monitored by using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) technique. Apart from these techniques, single frequency impedance (SFI) was used for investigation of antibody-antigen interactions...
September 12, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28916037/electrochemical-aptasensor-for-human-osteopontin-detection-using-a-dna-aptamer-selected-by-selex
#19
Sofia G Meirinho, Luís G Dias, António M Peres, Lígia R Rodrigues
A DNA aptamer with affinity and specificity for human osteopontin (OPN), a potential breast cancer biomarker, was selected using the SELEX process, considering its homology rate and the stability of its secondary structures. This aptamer exhibited a satisfactory affinity towards OPN, showing dissociation constants lower than 2.5 nM. It was further used to develop a simple, label-free electrochemical aptasensor against OPN. The aptasensor showed good sensitivity towards OPN in standard solutions, being the square wave voltammetry (SWV), compared to the cyclic voltammetry, the most sensitive technique with detection and quantification limits of 1...
September 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915946/a-hydrogen-peroxide-sensor-based-on-tnm-functionalized-reduced-graphene-oxide-grafted-with-highly-monodisperse-pd-nanoparticles
#20
Sait Bozkurt, Berna Tosun, Betül Sen, Süleyman Akocak, Aysun Savk, Mehmet Faruk Ebeoğlugil, Fatih Sen
Addressed herein, we report the synthesis and characterization of a tert-nonyl mercaptan (TNM) functionalized reduced graphene oxide (rGO) supported palladium (Pd) nanoparticles (NPs) (Pd/TNM@rGO) as electrochemical sensor. The highly monodisperse Pd/TNM@rGO nanocomposite was applied for electrochemical determination of hydrogen peroxide (H2O2) at a potential range of -0.6 to +0.8 V. The Pd/TNM@rGO sensor demonstrated very high activity, sensitivity, reusability and durability toward H2O2 sensing. The well dispersed Pd/TNM@rGO nanocomposite has been characterized by using several analytical techniques such as, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), electron energy loss spectroscopy (EELS) and electrochemical impedance spectroscopy (EIS)...
October 9, 2017: Analytica Chimica Acta
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