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https://www.readbyqxmd.com/read/27922643/a-kanamycin-sensor-based-on-an-electrosynthesized-molecularly-imprinted-poly-o-phenylenediamine-film-on-a-single-walled-carbon-nanohorn-modified-glassy-carbon-electrode
#1
Shuang Han, Bingqian Li, Ze Song, Sihao Pan, Zhichao Zhang, Hui Yao, Shuyun Zhu, Guobao Xu
A single-walled carbon nanohorn (SWCNH) has been used to construct a molecularly imprinted electrochemical sensor for the first time. Kanamycin, a widely used aminoglycoside antibiotic, is used as a representative analyte to test the detection strategy. The kanamycin sensor was constructed by the electropolymerization of a molecularly imprinted poly-o-phenylenediamine film on a SWCNH modified glassy carbon electrode. The sensor was investigated in the presence or absence of kanamycin by cyclic voltammetry to verify the changes in the redox peak currents of K3Fe(CN)6...
December 6, 2016: Analyst
https://www.readbyqxmd.com/read/27920895/organosilane-functionalization-of-nanostructured-indium-tin-oxide-films
#2
R Pruna, F Palacio, M Martínez, O Blázquez, S Hernández, B Garrido, M López
Fabrication and organosilane-functionalization and characterization of nanostructured ITO electrodes are reported. Nanostructured ITO electrodes were obtained by electron beam evaporation, and a subsequent annealing treatment was selectively performed to modify their crystalline state. An increase in geometrical surface area in comparison with thin-film electrodes area was observed by atomic force microscopy, implying higher electroactive surface area for nanostructured ITO electrodes and thus higher detection levels...
December 6, 2016: Interface Focus
https://www.readbyqxmd.com/read/27920880/conditional-electrical-stimulation-in-animal-and-human-models-for-neurogenic-bladder-working-toward-a-neuroprosthesis
#3
C R Powell
Sacral neuromodulation has had a tremendous impact on the treatment of urinary incontinence and lower urinary tract symptoms for patients with neurologic conditions. This stimulation does not use real-time data from the body or input from the patient. Incorporating this is the goal of those pursuing a neuroprosthesis to enhance bladder function for these patients. Investigators have demonstrated the effectiveness of conditional (also called closed-loop) feedback in animal models as well as limited human studies...
December 2016: Current Bladder Dysfunction Reports
https://www.readbyqxmd.com/read/27916961/recent-progress-in-electrochemical-biosensors-for-glycoproteins
#4
REVIEW
Uichi Akiba, Jun-Ichi Anzai
This review provides an overview of recent progress in the development of electrochemical biosensors for glycoproteins. Electrochemical glycoprotein sensors are constructed by combining metal and carbon electrodes with glycoprotein-selective binding elements including antibodies, lectin, phenylboronic acid and molecularly imprinted polymers. A recent trend in the preparation of glycoprotein sensors is the successful use of nanomaterials such as graphene, carbon nanotube, and metal nanoparticles. These nanomaterials are extremely useful for improving the sensitivity of glycoprotein sensors...
December 1, 2016: Sensors
https://www.readbyqxmd.com/read/27916666/rhythmic-entrainment-source-separation-optimizing-analyses-of-neural-responses-to-rhythmic-sensory-stimulation
#5
Michael X Cohen, Rasa Gulbinaite
Steady-state evoked potentials (SSEPs) are rhythmic brain responses to rhythmic sensory stimulation, and are often used to study perceptual and attentional processes. We present a data analysis method for maximizing the signal-to-noise ratio of the narrow-band steady-state response in the frequency and time-frequency domains. The method, termed rhythmic entrainment source separation (RESS), is based on denoising source separation approaches that take advantage of the simultaneous but differential projection of neural activity to multiple electrodes or sensors...
December 1, 2016: NeuroImage
https://www.readbyqxmd.com/read/27916553/nio-hedgehog-like-nanostructures-au-polyaniline-nanofibers-reduced-graphene-oxide-nanocomposite-with-electrocatalytic-activity-for-non-enzymatic-detection-of-glucose
#6
Kh Ghanbari, F Ahmadi
A novel sensitive non-enzymatic glucose sensor was fabricated based on nickel oxide hedgehog-like nanostructures decorated ternary gold nanoparticles/polyaniline nanofibers/reduced graphene oxide nanocomposites (NiO/Au/PANI/rGO). The morphology and structure of NiO/Au/PANI/rGO nanocomposites were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared (FT-IR). Electrochemical impedance spectroscopy (EIS) data also indicated the charge transfer of each layer decreased compared to the underneath layer...
December 1, 2016: Analytical Biochemistry
https://www.readbyqxmd.com/read/27914369/dna-tetrahedral-scaffolds-based-platform-for-the-construction-of-electrochemiluminescence-biosensor
#7
Qiu-Mei Feng, Zhen Zhou, Mei-Xing Li, Wei Zhao, Jing-Juan Xu, Hong-Yuan Chen
Proximal metallic nanoparticles (NPs) could quench the electrochemiluminescence (ECL) emission of semiconductor quantum dots (QDs) due to Förster energy transfer (FRET), but at a certain distance, the coupling of light-emission with surface plasmon resonance (SPR) result in enhanced ECL. Thus, the modification strategies and distances control between QDs and metallic NPs are critical for the ECL intensity of QDs. In this strategy, a SPR enhanced ECL sensor based on DNA tetrahedral scaffolds modified platform was reported for the detection of telomerase activity...
November 27, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27914335/studies-on-the-influence-of-%C3%AE-cyclodextrin-on-graphene-oxide-and-its-synergistic-activity-to-the-electrochemical-detection-of-nitrobenzene
#8
Murugan Velmurugan, Natarajan Karikalan, Shen-Ming Chen, Zi-Chi Dai
The impact of the β-cyclodextrin (β-CD) on the graphene oxide (GO) was considerably altered the activity of electrochemical sensors. Hence, the present study, we scrutinized the electrocatalytic determination of nitrobenzene (NB) by changing the different loading level of β-CD on GO modified electrodes. The composites were prepared by the simple ultrasonication method and characterized by UV-Visible spectroscopy, infrared spectroscopy and scanning electron microscope. Interestingly, the synergistic electrocatalytic activity was appeared for the 1...
November 10, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27913353/embroidered-electromyography-a-systematic-design-guide
#9
Ali Shafti, Roger Ribas Manero, Amanda Borg, Kaspar Althoefer, Matthew Howard
Muscle activity monitoring or Electromyography (EMG) is a useful tool. However, EMG is typically invasive, expensive and difficult to use for untrained users. A possible solution is textile-based surface EMG (sEMG) integrated into clothing as a wearable device. This is, however, challenging due to (i) uncertainties in the electrical properties of conductive threads used for electrodes, (ii) imprecise fabrication technologies (e.g., embroidery, sewing), and (iii) lack of standardization in design variable selection...
December 1, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/27911378/iridium-oxide-reduced-graphene-oxide-nanohybrid-thin-film-modified-screen-printed-electrodes-as-disposable-electrochemical-paper-microfluidic-ph-sensors
#10
Jiang Yang, Tae-Joon Kwak, Xiaodong Zhang, Robert McClain, Woo-Jin Chang, Sundaram Gunasekaran
A facile, controllable, inexpensive and green electrochemical synthesis of IrO2-graphene nanohybrid thin films is developed to fabricate an easy-to-use integrated paper microfluidic electrochemical pH sensor for resource-limited settings. Taking advantages from both pH meters and strips, the pH sensing platform is composed of hydrophobic barrier-patterned paper micropad (µPAD) using polydimethylsiloxane (PDMS), screen-printed electrode (SPE) modified with IrO2-graphene films and molded acrylonitrile butadiene styrene (ABS) plastic holder...
November 22, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27909510/interactive-in-vitro-training-in-physics-of-radiofrequency-ablation-for-physicians-and-medical-engineering-students
#11
REVIEW
Haber T, Kleister G, Selman B, Härtig J, Melichercik J, Ismer B
Radiofrequency (RF) ablation requires a complex set of devices as well as profound electrophysiological experience and substantial knowledge of physical science basics. To establish RF ablation in-vitro teaching-system, six workstations were equipped with computer-controlled RF ablation generators. Universal connection boxes allow ablation-essays with catheters of different make and model. Special wetlabs were developed combining a basin containing isotonic saline solution with a thermostat and a pump to simulate blood flow...
June 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27907873/excellent-storage-stability-and-sensitive-detection-of-neurotoxin-quinolinic-acid
#12
Ranjana Singh, Sunayana Kashyap, Suveen Kumar, Shiju Abraham, Tejendra K Gupta, Arvind M Kayastha, Bansi D Malhotra, Preeti Suman Saxena, Anchal Srivastava, Ranjan K Singh
Quinolinic acid (QA) is a metabolite of tryptophan degradation obtained through kynurenine pathway, produced naturally in the mammalian brain as well as in the human cerebrospinal fluid. The presence of QA ~10-40µM is a clear indicator of many neurological disorders as well as deficiency of vitamin B6 in human being. In the present work; rapid, sensitive and cost-effective bio-electrodes were prepared to detect the trace amount of endogenous neurotoxin (QA). Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) studies were carried out to measure the electrochemical response of the fabricated bio-electrodes as a function of QA concentrations...
November 23, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27905472/electrochemical-communication-with-the-inside-of-cells-using-micro-patterned-vertical-carbon-nanofibre-electrodes
#13
F J Rawson, M T Cole, J M Hicks, J W Aylott, W I Milne, C M Collins, S K Jackson, N J Silman, P M Mendes
With the rapidly increasing demands for ultrasensitive biodetection, the design and applications of new nano-scale materials for development of sensors based on optical and electrochemical transducers have attracted substantial interest. In particular, given the comparable sizes of nanomaterials and biomolecules, there exist plenty of opportunities to develop functional nanoprobes with biomolecules for highly sensitive and selective biosensing, shedding new light on cellular behaviour. Towards this aim, herein we interface cells with patterned nano-arrays of carbon nanofibers forming a nanosensor-cell construct...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27904092/development-and-biosensor-applications-of-novel-functional-electrodes
#14
Shigehiro Takahashi
 Phenylboronic acid (PBA) derivatives have been used as alternatives to enzymes in the development of sugar-sensitive systems because the optical and electrochemical properties of these derivatives are significantly modulated upon sugar binding. This article reviews the voltammetric properties of sugar sensors prepared using dithiobis (4-butyrylamino-m-phenylboronic acid) (DTBA-PBA)-modified electrodes and PBA-appended layer-by-layer film-modified electrodes. In addition, the redox properties of reduced graphene oxide (rGO)-modified glassy carbon electrodes (GCEs) are discussed...
2016: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/27901524/ternary-nicop-nanosheet-array-on-a-ti-mesh-a-high-performance-electrochemical-sensor-for-glucose-detection
#15
Zao Wang, Xiaoqin Cao, Danni Liu, Shuai Hao, Gu Du, Abdullah M Asiri, Xuping Sun
Electrode design is of significant importance in the construction of enhanced electrochemical sensing platforms, and nanoarrays are an attractive architecture in molecule detection with large specific surface area and easy access for target molecules. In this communication, we report on the development of a ternary NiCoP nanosheet array on a Ti mesh (NiCoP/Ti) as a non-noble metal efficient catalyst electrode for electro-oxidation of glucose in alkaline electrolytes. As an electrochemical sensor for glucose detection, NiCoP/Ti shows a fast response time of less than 3 s, a low detection limit of 0...
November 30, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27900581/molecular-dynamics-simulations-of-the-orientation-properties-of-cytochrome-c-on-the-surface-of-single-walled-carbon-nanotubes
#16
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/27900329/postinsertional-cable-movements-of-cochlear-implant-electrodes-and-their-effects-on-intracochlear-pressure
#17
I Todt, D Karimi, J Luger, A Ernst, P Mittmann
Introduction. To achieve a functional atraumatic cochlear implantation, intracochlear pressure changes during the procedure should be minimized. Postinsertional cable movements are assumed to induce intracochlear pressure changes. The aim of this study was to observe intracochlear pressure changes due to postinsertional cable movements. Materials and Methods. Intracochlear pressure changes were recorded in a cochlear model with a micro-pressure sensor positioned in the apical region of the cochlea model to follow the maximum amplitude and pressure gain velocity in intracochlear pressure...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27897238/synergetic-signal-amplification-of-multi-walled-carbon-nanotubes-fe3o4-hybrid-and-trimethyloctadecylammonium-bromide-as-a-highly-sensitive-detection-platform-for-tetrabromobisphenol-a
#18
Feng Zhou, Yue Wang, Wei Wu, Tao Jing, Surong Mei, Yikai Zhou
In this work, we fabricated an electrochemical sensor based on trimethyloctadecylammonium bromide and multi-walled carbon nanotubes-Fe3O4 hybrid (TOAB/MWCNTs-Fe3O4) for sensitive detection of tetrabromobisphenol A (TBBPA). The nanocomposite was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) techniques. The electrochemical behaviors of TBBPA on TOAB/MWCNTs-Fe3O4 composite film modified glassy carbon electrode (GCE) were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) method...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27896345/high-performance-flexible-strain-sensor-based-on-self-locked-overlapping-graphene-sheets
#19
Dan-Yang Wang, Lu-Qi Tao, Ying Liu, Tian-Yu Zhang, Yu Pang, Qian Wang, Song Jiang, Yi Yang, Tian-Ling Ren
Strain sensors have been widely used in the fields of wearable devices, robot arms, medical sensing, bio-sensing, artificial skin and so on, but the existing strain sensors have some shortcomings such as a limited gauge factor (GF) or strain range. We fabricate a novel and flexible strain sensor with high performance based on self-locked overlapping graphene sheets (SOGS) which can be used for wearable devices. Polydimethylsiloxane (PDMS) is used to lock the overlapping graphene sheets, and then the graphene can be stretched and achieve an ultrahigh GF...
November 29, 2016: Nanoscale
https://www.readbyqxmd.com/read/27894754/composite-of-cu-metal-nanoparticles-multiwall-carbon-nanotubes-reduced-graphene-oxide-as-a-novel-and-high-performance-platform-of-the-electrochemical-sensor-for-simultaneous-determination-of-nitrite-and-nitrate
#20
Hasan Bagheri, Ali Hajian, Mosayeb Rezaei, Ali Shirzadmehr
In the present research, we aimed to fabricate a novel electrochemical sensor based on Cu metal nanoparticles on the multiwall carbon nanotubes-reduced graphene oxide nanosheets (Cu/MWCNT/RGO) for individual and simultaneous determination of nitrite and nitrate ions. The morphology of the prepared nanocomposite on the surface of glassy carbon electrode (GCE) was characterized using various methods including scanning electron microscopy (SEM), atomic force microscopy (AFM), and electrochemical impedance spectroscopy...
November 21, 2016: Journal of Hazardous Materials
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