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https://www.readbyqxmd.com/read/29161664/sandwich-type-biosensor-for-the-detection-of-%C3%AE-2-3-sialylated-glycans-based-on-fullerene-palladium-platinum-alloy-and-4-mercaptophenylboronic-acid-nanoparticle-hybrids-coupled-with-au-methylene-blue-mal-signal-amplification
#1
Qiqi Yuan, Junlin He, Yazhen Niu, Jun Chen, Yilin Zhao, Yuchan Zhang, Chao Yu
α2,3-sialylated glycans (α2,3-sial-Gs) are one of the significant tumour biomarkers for the early diagnosis of cancer. In this work, a neoteric sandwich-type biosensor was developed for detecting α2,3-sial-Gs using 4-mercaptophenylboronic acid (4-MPBA) to construct a novel molecular recognition system by the coordination of a boron atom of 4-MPBA to the amide group of Neu5Ac in the α2,3-sial-Gs structure. Amino-functionalized fullerene coupled with palladium-platinum bimetallic alloy nanocrystals (n-C60-PdPt) was synthesized to modify the surface of a glassy carbon electrode (GCE) because the n-C60 nanomaterial affords a large surface area for the on-site reduction of bimetallic alloy nanoparticles and an excellent capacity for electron transfer...
November 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29161663/quantifying-the-flow-efficiency-in-constant-current-capacitive-deionization
#2
Steven A Hawks, Jennifer M Knipe, Patrick G Campbell, Colin K Loeb, McKenzie A Hubert, Juan G Santiago, Michael Stadermann
Here we detail a previously unappreciated loss mechanism inherent to capacitive deionization (CDI) cycling operation that has a substantial role determining performance. This mechanism reflects the fact that desalinated water inside a cell is partially lost to re-salination if desorption is carried out immediately after adsorption. We describe such effects by a parameter called the flow efficiency, and show that this efficiency is distinct from and yet multiplicative with other highly-studied adsorption efficiencies...
November 11, 2017: Water Research
https://www.readbyqxmd.com/read/29161644/treatment-of-industrial-estate-wastewater-by-the-application-of-electrocoagulation-process-using-iron-electrodes
#3
Y Yavuz, Ü B Ögütveren
In this study electrocoagulation (EC) of industrial estate wastewater taken from the inlet of wastewater treatment plant was investigated using sacrificial iron electrodes. Employing a pole changer to homogenous consumption of electrodes, studies on the parameters such as current density, supporting electrolyte concentration and initial pH, which have significant effects on COD removal and hence the energy consumption, were performed. Hydrogen peroxide was used in different concentrations to observe its effects on COD removal efficiency and the energy consumption...
November 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29161046/heavy-metal-free-tannin-from-bark-for-sustainable-energy-storage
#4
Alolika Mukhopadhyay, Yucong Jiao, Rui Katahira, Peter N Ciesielski, Michael E Himmel, Hongli Zhu
A novel renewable cathode made from earth-abundant, low-cost materials can contribute to the intermittent storage needs of renewable energy based society. Inspired by Nature, we report for the first-time tannin as a cathode material. Our approach exploits the charge storage mechanism of the redox active quinone moiety. Tannins extracted from tree bark using environmental friendly aqueous solvents has the highest phenol content (5.56 mol g-1) among all the natural phenolic biopolymers, 5000 times higher than lignin...
November 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/29161018/self-powered-biosensors
#5
Matteo Grattieri, Shelley D Minteer
Self-powered electrochemical biosensors utilize biofuel cells as a simultaneous power source and biosensor, which simplifies the biosensor system, because it no longer requires a potentiostat, power for the potentiostat, and/or power for the signaling device. This Review article is focused on detailing the advances in the field of self-powered biosensors and discussing their advantages and limitations compared to other types of electrochemical biosensors. The review will discuss self-powered biosensors formed from enzymatic biofuel cells, organelle-based biofuel cells, and microbial fuel cells...
November 21, 2017: ACS Sensors
https://www.readbyqxmd.com/read/29160929/anatomical-variations-of-the-human-cochlea-determined-from-micro-ct-and-high-resolution-ct-imaging-and-reconstruction
#6
Jie Tang, Xianglong Tang, Zhenhua Li, YiKang Liu, SongHua Tan, Heng Li, RongDan Ke, Zhi Wang, Li Gong, AnZhou Tang
Understanding the anatomical variations in the human cochlea are important for cochlear implants. This study examined these variations using a reconstructed fusion model of the skull and temporal bone. The 3D digital model of the temporal bone was reconstructed from multiple axial micro-CT scans of temporal bone and high resolution CT (HRCT) of the skull from 15 cadavers. A skull model was reconstructed and merged with the reconstructed temporal bone. The 3D relationship between the cochlea and the skull's mid-sagittal plane was analyzed...
November 21, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29160869/an-electrochemical-microrna-sensing-platform-based-on-tungsten-diselenide-nanosheets-and-competitive-rna-rna-hybridization
#7
Ying-Xu Chen, Wen-Jing Zhang, Ke-Jing Huang, Mingbo Zheng, Ya-Cen Mao
In this work, we report an ultrasensitive electrochemical biosensor for microRNA-21 (miRNA-21) detection by using a competitive RNA-RNA hybridization configuration. A biotinylated miRNA of the self-same sequence with the target miRNA is mixed with the samples, and allowed competition with the target miRNA for a thiolated RNA probe immobilized onto a tungsten diselenide (WSe2) nanosheet modified electrode. Thereafter the current response is obtained by forming the hybridized biotinylated miRNA with streptavidin-horseradish peroxidase (HRP) conjugates to catalyze the H2O2 + hydroquinone (HQ) system...
November 21, 2017: Analyst
https://www.readbyqxmd.com/read/29160851/development-of-an-impedimetric-aptasensor-for-the-detection-of-staphylococcus-aureus
#8
Peggy Reich, Regina Stoltenburg, Beate Strehlitz, Dieter Frense, Dieter Beckmann
In combination with electrochemical impedance spectroscopy, aptamer-based biosensors are a powerful tool for fast analytical devices. Herein, we present an impedimetric aptasensor for the detection of the human pathogen Staphylococcus aureus. The used aptamer targets protein A, a surface bound virulence factor of S. aureus. The thiol-modified protein A-binding aptamer was co-immobilized with 6-mercapto-1-hexanol onto gold electrodes by self-assembly. Optimization of the ratio of aptamer to 6-mercapto-1-hexanol resulted in an average density of 1...
November 21, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29160834/underlying-physics-of-conductive-polymer-composites-and-force-sensing-resistors-fsrs-a-study-on-creep-response-and-dynamic-loading
#9
Leonel Paredes-Madrid, Arnaldo Matute, Jorge O Bareño, Carlos A Parra Vargas, Elkin I Gutierrez Velásquez
Force Sensing Resistors (FSRs) are manufactured by sandwiching a Conductive Polymer Composite (CPC) between metal electrodes. The piezoresistive property of FSRs has been exploited to perform stress and strain measurements, but the rheological property of polymers has undermined the repeatability of measurements causing creep in the electrical resistance of FSRs. With the aim of understanding the creep phenomenon, the drift response of thirty two specimens of FSRs was studied using a statistical approach. Similarly, a theoretical model for the creep response was developed by combining the Burger's rheological model with the equations for the quantum tunneling conduction through thin insulating films...
November 21, 2017: Materials
https://www.readbyqxmd.com/read/29160761/fronto-parietal-coherence-response-to-tdcs-modulation-in-patients-with-disorders-of-consciousness
#10
Yang Bai, Xiaoyu Xia, Yong Wang, Yongkun Guo, Yi Yang, Jianghong He, Xiaoli Li
A transcranial direct current stimulation (tDCS) protocol (2 min, 2 mA, anodal electrode at the left dorsolateral prefrontal cortex and cathodal electrode at the right supraorbital area) was applied in patients with different degrees of disorders of consciousness (DoC). Although previous research indicates that it could improve patients' coma recovery scale-revised (CRS-R) scores, the brain's electrophysiological responses to tDCS are still unclear. Therefore, the present study was performed to explore the underlying brain responses of patients in a minimally conscious state (MCS) and a Unresponsive Wakefulness Syndrome (UWS) to tDCS modulation...
November 21, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/29160240/remapping-cortical-modulation-for-electrocorticographic-brain-computer-interfaces-a-somatotopy-based-approach-in-individuals-with-upper-limb-paralysis
#11
Alan D Degenhart, Shivayogi V Hiremath, Ying Yang, Stephen T Foldes, Jennifer L Collinger, Michael L Boninger, Elizabeth C Tyler-Kabara, Wei Wang
OBJECTIVE: Brain-computer interface (BCI) technology aims to provide individuals with paralysis a means to restore function. Electrocorticography (ECoG) uses disc electrodes placed on either the surface of the dura or the cortex to record field potential activity. ECoG has been proposed as a viable neural recording modality for BCI systems, potentially providing stable, long-term recordings of cortical activity with high spatial and temporal resolution. Previously we have demonstrated that a subject with spinal cord injury (SCI) could control an ECoG-based BCI system with up to three degrees of freedom [Wang et al...
November 21, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29160224/colloidal-paradigm-in-supercapattery-electrode-systems
#12
Kunfeng Chen, Dongfeng Xue
Among decades of development, electrochemical energy storage system is now sorely in need of new design paradigm at nanosize and ion-level to satisfy the higher energy and higher power demand. In this review paper, we introduce a new colloidal electrode paradigm for supercapattery which integrates multiple-scale matter existing forms, i.e., ion clusters, colloidal ions, nanosized materials, into one colloid system, coupled with multiple interactions, i.e., electrostatic, van der Waals force, chemical bonding, leading to the formation of many redox reactive centers...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160064/effect-of-polarization-reversal-in-ferroelectric-tin-hf0-5zr0-5o2-tin-devices-on-electronic-conditions-at-interfaces-studied-in-operando-by-hard-x-ray-photoemission-spectroscopy
#13
Yury Matveyev, Dmitry Nergov, Anna Chernikova, Yury Lebedinskii, Roman Kirtaev, Sergei Zarubin, Elena Suvorova, Andrei Gloskovskii, Andrei Zenkevich
Because of their compatibility with modern Si based technology, HfO2-based ferroelectric films have recently attracted attention as strong candidates for applications in memory devices, in particular, ferroelectric field-effect transistors (FeFET) or ferroelectric tunnel junctions (FTJ). A key property defining the functionality of these devices is the polarization dependent change of the electronic band alignment at the metal/ferroelectric interface. Here, we report on the effect of polarization reversal in functional ferroelectric TiN/Hf0...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29160063/effect-on-electrode-work-function-by-changing-molecular-geometry-of-conjugated-polymer-electrolytes-and-application-for-hole-transporting-layer-of-organic-optoelectronic-devices
#14
Eui Jin Lee, Min Hee Choi, Yong Woon Han, Doo Kyung Moon
In this study, we synthesized three conjugated polymer electrolytes (CPEs) with different conjugation lengths to control their dipole moments by varying spacers. p-type CPEs (PFT-D, PFtT-D, and PFbT-D) were generated by the facile oxidation of n-type CPEs (PFT, PFtT, PFbT) and introduced as the hole-transporting layers (HTLs) of organic solar cells (OSCs) and polymer light-emitting diodes (PLEDs). To identify the effect on electrode work function tunability by changing the molecular conformation and arrangement, we simulated density function theory calculations of these molecules and performed ultraviolet photoelectron spectroscopy analysis for films of indium tin oxide/CPEs...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29160058/unraveled-face-dependent-effects-of-multi-layered-graphene-embedded-in-transparent-organic-light-emitting-diodes
#15
Jong Tae Lim, Jaesu Kim, Hyunkoo Lee, Jaehyun Moon, Byoung-Hwa Kwon, Seongdeok Ahn, Nam Sung Cho, Byung-Wook Ahn, Jeong-Ik Lee, Kyuwook Ihm, Seong Chu Lim
With increasing demand for transparent conducting electrode, graphene has attracted considerable attention, owing to its high electrical conductivity, high transmittance, low reflectance, flexibility and tunable work function. Two faces of single layer graphene are indistinguishable in its nature and this idea has not been doubted even in multilayered graphene (MLG) because it is difficult to separately characterize the front (first-born) and rear face (last-born) of MLG by using conventional analysis tools, such as Raman, ultraviolet spectroscopy, scanning probe microscopy, and sheet resistance...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29159836/mechanisms-of-calcium-sequestration-by-isolated-malpighian-tubules-of-the-house-cricket-acheta-domesticus
#16
Austin Browne, Michael J O'Donnell
Hemolymph calcium homeostasis in insects is achieved by the Malpighian tubules, primarily by sequestering excess Ca(2+) within internal calcium stores (Ca-rich granules) most often located within type I (principal) tubule cells. Using both the scanning ion-selective electrode technique and the Ramsay secretion assay this study provides the first measurements of basolateral and transepithelial Ca(2+) fluxes across the Malpighian tubules of an Orthopteran insect, the house cricket Acheta domesticus. Ca(2+) transport was specific to midtubule segments, where 97% of the Ca(2+) entering the tubule is sequestered within intracellular calcium stores and the remaining 3% is secreted into the lumen...
November 21, 2017: Archives of Insect Biochemistry and Physiology
https://www.readbyqxmd.com/read/29159513/molybdenum-coated-su-8-microneedle-electrodes-for-transcutaneous-electrical-nerve-stimulation
#17
Ramin Soltanzadeh, Elnaz Afsharipour, Cyrus Shafai, Neda Anssari, Behzad Mansouri, Zahra Moussavi
Electrophysiological devices are connected to the body through electrodes. In some applications, such as nerve stimulation, it is needed to minimally pierce the skin and reach the underneath layers to bypass the impedance of the first layer called stratum corneum. In this study, we have designed and fabricated surface microneedle electrodes for applications such as electrical peripheral nerve stimulation. We used molybdenum for microneedle fabrication, which is a biocompatible metal; it was used for the conductive layer of the needle array...
November 21, 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/29159480/electrochemical-behavior-and-in-vitro-antimicrobial-screening-of-some-thienylazoaryls-dyes
#18
Joseph Tsemeugne, Emmanuel Sopbué Fondjo, Jean-de-Dieu Tamokou, Ignas Tonle, Irene Chinda Kengne, Arnaud Djintchui Ngongang, Stephen Tamekou Lacmata, Taoufik Rohand, Jules Roger Kuiate, Beibam Luc Sondengam
BACKGROUND: A series of recently reported phenolic azo dyes 7a-e were prepared by coupling the thienyl diazonium sulfate of 3-Amino-4H-benzo[f]thieno[3,4-c](2H)chromen-4-one with selected diversely substituted phenolic and naphtholic derivatives. These compounds were evaluated for their antibacterial and antifungal activities. Furthermore their voltammetric behavior was compared at a glassy carbon electrode. RESULTS: The voltammetric behavior of the five recently reported azo dyes has been compared at a glassy carbon electrode...
November 21, 2017: Chemistry Central Journal
https://www.readbyqxmd.com/read/29159356/influence-of-the-anatase-rutile-ratio-on-the-charge-transport-properties-of-tio2-nts-arrays-studied-by-dual-wavelength-opto-electrochemical-impedance-spectroscopy
#19
T Cottineau, H Cachet, V Keller, E M M Sutter
The modification of photo-generated charge transport properties in aligned titanium dioxide nanotubes (TiO2-NTs) regarding the anatase/rutile ratio was studied by photo-electrochemical methods. TiO2-NTs obtained by anodization were thermally treated under air flux at different temperatures to significantly modify the proportion of TiO2 anatase and rutile phases in the tubular structure. Material characterisation methods (XRD, SEM, UV-visible spectroscopy) were used to determine the characteristics of the different TiO2-NT electrodes in terms of dimensions, proportion of each phase and optical properties...
November 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29159345/multiplexed-electrochemical-immunoassay-for-two-immunoglobulin-proteins-based-on-cd-and-cu-nanocrystals
#20
Dianping Tang, Jingjing Ren, Minghua Lu
Herein, a simple and feasible electrochemical immunosensing method for simultaneous voltammetric detection of two immunoglobulin proteins, human IgG (HIgG) and rabbit IgG (RIgG), was developed using two distinguishable signal-generation tags on the same electrode. The immunosensor was prepared by immobilizing two Fab antibody fragments on a gold electrode. After this, Cu and Cd nanocrystals, as nanotags, were synthesized and functionalized with identical detection antibodies. Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) were employed to characterize the Cu and Cd nanocrystals...
November 21, 2017: Analyst
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