keyword
MENU ▼
Read by QxMD icon Read
search

Electrochemical

keyword
https://www.readbyqxmd.com/read/28647463/the-structurally-unique-photosynthetic-chlorella-variabilis-nc64a-hydrogenase-does-not-interact-with-plant-type-ferredoxins
#1
Vera Engelbrecht, Patricia Rodríguez-Maciá, Julian Esselborn, Anne Sawyer, Anja Hemschemeier, Olaf Rüdiger, Wolfgang Lubitz, Martin Winkler, Thomas Happe
Hydrogenases from green algae are linked to the photosynthetic electron transfer chain via the plant-type ferredoxin PetF. In this work the [FeFe]-hydrogenase from the Trebouxiophycean alga Chlorella variabilis NC64A (CvHydA1), which in contrast to other green algal hydrogenases contains additional FeS-cluster binding domains, was purified and specific enzyme activities for both hydrogen (H2) production and H2 oxidation were determined. Interestingly, although C. variabilis NC64A, like many Chlorophycean algal strains, exhibited light-dependent H2 production activity upon sulfur deprivation, CvHydA1 did not interact in vitro with several plant-type [2Fe-2S]-ferredoxins, but only with a bacterial2[4Fe4S]-ferredoxin...
June 21, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28647320/an-integrated-aerobic-anaerobic-strategy-for-performance-enhancement-of-pseudomonas-aeruginosa-inoculated-microbial-fuel-cell
#2
Xiao-Yu Yong, Zhi-Ying Yan, Hai-Bo Shen, Jun Zhou, Xia-Yuan Wu, Li-Juan Zhang, Tao Zheng, Min Jiang, Ping Wei, Hong-Hua Jia, Yang-Chun Yong
Microbial fuel cell (MFC) is a promising device for energy generation and organic waste treatment simultaneously by electrochemically active bacteria (EAB). In this study, an integrated aerobic-anaerobic strategy was developed to improve the performance of P. aeruginosa-inoculated MFC. With an aerobic start-up and following an anaerobic discharge process, the current density of MFC reached a maximum of 99.80µA/cm(2), which was 91.6% higher than the MFC with conventional constant-anaerobic operation. Cyclic voltammetry and HPLC analysis showed that aerobic start-up significantly increased electron shuttle (pyocyanin) production (76% higher than the constant-anaerobic MFC)...
June 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28647148/monolithic-capillary-column-with-an-integrated-electrochemical-detector
#3
Martina Komendová, Radovan Metelka, Jiří Urban
The carbon fiber and silver microwire were used as working and pseudoreference electrode, respectively, and inserted into the ending of capillary to prepare monolithic capillary column with an integrated electrochemical detector. Prepared capillary devices offered stable and robust results with relative standard deviations of retention, resolution, and detection signal lower than 1.5, 5.5, and 5.0%, respectively. To further increase sensitivity of developed electrochemical microdetector, multiple pulse amperometry detection mode has been used...
June 19, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28646720/nanoporous-gold-based-microbial-biosensor-for-direct-determination-of-sulfide
#4
Zhuang Liu, Hanyue Ma, Huihui Sun, Rui Gao, Honglei Liu, Xia Wang, Ping Xu, Luying Xun
Environmental pollution caused by sulfide compounds has become a major problem for public health. Hence, there is an urgent need to explore a sensitive, selective, and simple sulfide detection method for environmental monitoring and protection. Here, a novel microbial biosensor was developed using recombinant Escherichia coli BL21 (E. coli BL21) expressing sulfide:quinone oxidoreductase (SQR) for sulfide detection. As an important enzyme involved in the initial step of sulfide metabolism, SQR oxidizes sulfides to polysulfides and transfers electrons to the electron transport chain...
June 20, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28646137/three-dimensional-multi-doped-porous-carbon-graphene-derived-from-sewage-sludge-with-template-assisted-fe-pillared-montmorillonite-for-enhanced-oxygen-reduction-reaction
#5
Meiqing Chen, Pingxiao Wu, Liya Chen, Shanshan Yang, Langfeng Yu, Yuefei Ding, Nengwu Zhu, Zhenqing Shi, Zehua Liu
Three-dimensional multi-doped porous carbon/graphene (Fe-Mt-SS-C) was prepared by carbonization of sewage sludge with template-assisted Fe-pillared montmorillonite. The material consisted of nanosheet- and particle- carbon had a high specific surface area (784.46 m(2)·g(-1)) and hierarchical porous structure of micro-, meso- and macropores. The prepared Fe-Mt-SS-C had a high degree of graphitization and large amount of defect atoms. The pyrolysis process made full use of the C, N, Fe, and S by turning them into the carbon framework of the as-obtained material in situ...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28645764/electrochemical-behavior-of-pb-ii-on-a-heparin-modified-chitosan-graphene-nanocomposite-film-coated-glassy-carbon-electrode-and-its-sensitive-detection
#6
Priya T, Dhanalakshmi N, Thinakaran N
In this study, we developed a novel composite material containing biological macromolecules like heparin and chitosan coated on reduced graphene oxide (rGO) for the modification of glassy carbon electrode (hep/CS-rGO/GC). It can be applied for the sensitive electrochemical detection of Pb(2+) by square wave anodic stripping voltammetry (SWASV). The physicochemical analysis such as XRD, FTIR, FESEM and Raman spectroscopy techniques revealed that an effective functionalization occurred at the rGO surface. The consequence of deposition and stripping of metal ions by various electrochemical parameters such as supporting electrolytes, pH value, deposition potential, and deposition time were carefully studied and optimized...
June 20, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28645004/amplified-detection-of-hepatitis-b-virus-using-an-electrochemical-dna-biosensor-on-a-nanoporous-gold-platform
#7
Laleh Enayati Ahangar, Masoud A Mehrgardi
In the present study, a nanoporous gold platform was applied for the amplified detection of Hepatitis B virus (HBV) by an electrochemical DNA biosensor. Ferrocene as a redox reporter was covalently attached to the DNA probe and its electrochemical signal was recorded as the biosensor response. For real samples, DNA was firstly extracted from blood of patients and then amplified by polymerase chain reaction (PCR) for 5cycles. Sensitivity of this biosensor was enhanced by using nanoporous gold electrode, therefore this sensor can discriminate the genome of HBV in real sample with low PCR cycles...
June 15, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28644607/electrochemical-exfoliation-of-graphite-in-aqueous-sodium-halide-electrolytes-towards-low-oxygen-content-graphene-for-energy-and-environmental-applications
#8
Jose Maria Munuera, Juan Ignacio Paredes, Marina Enterria, Ana Pagán, Silvia Villar-Rodil, Manuel Fernando R Pereira, J I Martins, José L Figueiredo, Jose Luis Cenis, Amelia Martinez-Alonso, Juan Manuel D Tascon
Graphene and graphene-based materials have shown great promise in many technological applications, but their large-scale production and processing by simple and cost-effective means still constitute significant issues in the path of their widespread implementation. Here, we investigate a straightforward method for the preparation of a ready-to-use and low oxygen content graphene material that is based on electrochemical (anodic) delamination of graphite in aqueous medium with sodium halides as the electrolyte...
June 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28644506/reduced-graphene-oxide-coated-porous-carbon-sulfur-nanofiber-as-a-flexible-paper-electrode-for-lithium-sulfur-batteries
#9
R X Chu, J Lin, C Q Wu, J Zheng, Y L Chen, J Zhang, R H Han, Y Zhang, H Guo
Lithium-sulfur (Li-S) batteries have attracted great attention owing to their excellent electrochemical properties, such as the high discharge voltage of 2.3 V, specific capacity of 1675 mA h g(-1) and energy density of 2600 Wh kg(-1). The widely used slurry made electrodes of Li-S batteries are plagued by the serious shuttle effect and insulating nature of sulfur. Herein, a reduced graphene oxide coated porous carbon nanofiber flexible paper (rGO@S-PCNP) was fabricated and directly used as an additive-free cathode for Li-S batteries...
June 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28644503/the-first-re-i-organometallic-complex-with-an-organoimido-polyoxometalate-ligand
#10
Patricio Hermosilla-Ibáñez, Kerry Wrighton-Araneda, Gaspar Prado, Verónica Paredes-García, Nancy Pizarro, Andrés Vega, Diego Venegas-Yazigi
The spectroscopic, electrochemical and photophysical properties of the first Re(I) organometallic organoimido-polyoxometalate complex [n-Bu4N][Mo6O18NC6H4-CH2-N3C2H2-Re-phen(CO)3] compared with all fragments are reported. The UV-Vis spectra are analysed using experimental and theoretical tools. In contrast to the reported studies in the literature, our results show that a new more intense band is present in the spectra of the hybrid ligand obscuring the intra-polyanion charge transfer. The electrochemical results show that the strong acceptor character of the polyoxometalate fragment is quenched by the condensation of the phenyl-triazole molecule...
June 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28644401/the-investigation-of-electrochemistry-behaviors-of-tyrosinase-based-on-directly-electrodeposited-grapheneon-choline-gold-nanoparticles
#11
Yaping He, Xiaohui Yang, Quan Han, Jianbin Zheng
A novel catechol (CA) biosensor was developed by embedding tyrosinase (Tyr) onto in situ electrochemical reduction graphene (EGR) on choline-functionalized gold nanoparticle (AuNPs-Ch) film. The results of UV-Vis spectra indicated that Tyr retained its original structure in the film, and an electrochemical investigation of the biosensor showed a pair of well-defined, quasi-reversible redox peaks with Epa = -0.0744 V and Epc = -0.114 V (vs. SCE) in 0.1 M, pH 7.0 sodium phosphate-buffered saline at a scan rate of 100 mV/s...
June 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28644008/influence-of-tip-and-substrate-properties-and-nonsteady-state-effects-on-nanogap-kinetic-measurements-response-to-comment-on-impact-of-adsorption-on-scanning-electrochemical-microscopy-voltammetry-and-implications-for-nanogap-measurements
#12
https://www.readbyqxmd.com/read/28644005/from-electrochemistry-to-electroluminescence-development-and-application-in-ratiometric-aptasensor-for-aflatoxin-b1
#13
Long Wu, Fan Ding, Wenmin Yin, Jing Ma, Biru Wang, Axiu Nie, Heyou Han
Aflatoxin B1 (AFB1), one of the most toxic chemical carcinogens, has been widely studied. It remains challenging to develop simple, accurate and sensitive analytical methods for the detection of AFB1 in food matrices. In this work, based on dual-signaling strategy, a ratiometric aptasensor was designed and verified for the accurate and sensitive detection of AFB1. The electrochemical method was first used as a model to verify the specific interaction between AFB1 and the aptamer, in which ferrocene (Fc) and methylene blue (MB) anchored DNA sequences were acted as dual signals...
June 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28643961/bioelectroventing-an-electrochemical-assisted-bioremediation-strategy-for-cleaning-up-atrazine-polluted-soils
#14
Ainara Domínguez-Garay, Jose Rodrigo Quejigo, Ulrike Dörfler, Reiner Schroll, Abraham Esteve-Núñez
The absence of suitable terminal electron acceptors (TEA) in soil might limit the oxidative metabolism of environmental microbial populations. Bioelectroventing is a bioelectrochemical strategy that aims to enhance the biodegradation of a pollutant in the environment by overcoming the electron acceptor limitation and maximizing metabolic oxidation. Microbial electroremediating cells (MERCs) are devices that can perform such a bioelectroventing. We also report an overall profile of the (14) C-ATR metabolites and (14) C mass balance in response to the different treatments...
June 23, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28643934/comprehensive-insights-into-the-thermal-stability-biodegradability-and-combustion-chemistry-of-pyrrolidinium-based-ionic-liquids
#15
Gebrekidan Gebreselassie Eshetu, Sangsik Jeong, Pascal Pandard, Amandine Lecocq, Guy Marlair, Stefano Passerini
The use of ionic liquids (ILs) as advanced electrolytes components in electrochemical energy storage devices is one of the most appealing and emerging options. However, though ILs are hailed as safer and eco-friendly electrolytes, overcoming the limitations imposed by the highly volatile/combustible carbonate based electrolytes, the full scale and precise appraisal of their overall safety levels under abuse conditions still need to be fully addressed. With the aim of providing the entreated level of information on the thermal and chemical stabilities as well as actual fire hazards, we embarked on a detailed investigation of the short - and long - term thermal stabilities, bio-degradability and combustion behaviour of various pyrrolidinium ([Pyr1A] +)-based ILs, enlisting different alkyl chain lengths, [Pyr1A] + (A=3-10), counter-anions ([TFSI]-/[FSI]-/[BETI]-), cations (Pyr14+/Pyr12O1+) and the effect of doping with Li salts (e...
June 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28643782/group-additivity-pourbaix-diagrams-advocate-thermodynamically-stable-nanoscale-clusters-in-aqueous-environments
#16
Lindsay A Wills, Xiaohui Qu, I-Ya Chang, Thomas J L Mustard, Douglas A Keszler, Kristin A Persson, Paul Ha-Yeon Cheong
The characterization of water-based corrosion, geochemical, environmental and catalytic processes rely on the accurate depiction of stable phases in a water environment. The process is aided by Pourbaix diagrams, which map the equilibrium solid and solution phases under varying conditions of pH and electrochemical potential. Recently, metastable or possibly stable nanometric aqueous clusters have been proposed as intermediate species in non-classical nucleation processes. Herein, we describe a Group Additivity approach to obtain Pourbaix diagrams with full consideration of multimeric cluster speciation from computations...
June 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28643445/a-novel-electrochemical-biosensor-with-dual-signal-outputs-toward-simultaneous-quantification-of-ph-and-o2-in-brain-upon-ischemia-and-in-tumor-during-cancer-therapy
#17
Li Liu, Fan Zhao, Wei Liu, Tong Zhu, Zh John Zhang, Chen Chen, Zhihui Dai, Huisheng Peng, Jun-Long Huang, Qin Hu, Wenbo Bu, Yang Tian
In this work, we develop a novel methodology for designing electrochemical biosensors with both current and potential signal outputs for simultaneous determination of two important species in the live systems. By designing a new molecule, Hemin-aminoferrocene (Hemin-Fc), we create a single electrochemical biosensor for simultaneous quantification of O2 and pH in brain upon ischemia and in tumor during cancer starvation therapy. The reduction peak current of Hemin group increases with rising concentrations of O2 from 1...
June 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28643433/electrochemical-ters-elucidates-potential-induced-molecular-reorientation-of-adenine-au-111
#18
Natalia Martín Sabanés, Tatsuhiko Ohto, Denis Andrienko, Yuki Nagata, Katrin F Domke
Electrochemical surface activity arises from the interaction and geometric arrangement of molecules at electrified interfaces. We present a novel electrochemical tip-enhanced Raman spectroscope that can access the vibrational fingerprint of less than 100 small, non-resonant molecules adsorbed at atomically flat Au electrodes to study their adsorption geometry and chemical reactivity as a function of applied potential. Combining experimental and simulation data for showcase adenine/Au(111), we conclude that protonated physisorbed adenine adapts a tilted orientation at low potentials while it is vertically adsorbed around the potential of zero charge...
June 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28643429/advances-and-challenges-in-metal-sulfides-selenides-for-next-generation-rechargeable-sodium-ion-batteries
#19
REVIEW
Zhe Hu, Qiannan Liu, Shu-Lei Chou, Shi-Xue Dou
Rechargeable sodium-ion batteries (SIBs), as the most promising alternative to commercial lithium-ion batteries, have received tremendous attention during the last decade. Among all the anode materials for SIBs, metal sulfides/selenides (MXs) have shown inspiring results because of their versatile material species and high theoretical capacity. They suffer from large volume expansion, however, which leads to bad cycling performance. Thus, methods such as carbon modification, nanosize design, electrolyte optimization, and cut-off voltage control are used to obtain enhanced performance...
June 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28643406/prussian-blue-nanocubes-with-an-open-framework-structure-coated-with-pedot-as-high-capacity-cathodes-for-lithium-sulfur-batteries
#20
Dawei Su, Michael Cortie, Hongbo Fan, Guoxiu Wang
It is shown that Prussian blue analogues (PBAs) can be a very competitive sulfur host for lithium-sulfur (Li-S) batteries. Sulfur stored in the large interstitial sites of a PBA host can take advantage of reversible and efficient insertion/extraction of both Li(+) and electrons, due to the well-trapped mobile dielectron redox centers in the well-defined host. It is demonstrated that Na2 Fe[Fe(CN)6 ] has a large open framework, and as a cathode, it both stores sulfur and acts as a polysulfide diffusion inhibitor based on the Lewis acid-base bonding effect...
June 23, 2017: Advanced Materials
keyword
keyword
37101
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"