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https://www.readbyqxmd.com/read/28635631/ag-nanoparticles-drop-casting-modification-of-screen-printed-electrodes-for-the-simultaneous-voltammetric-determination-of-cu-ii-and-pb-ii
#1
Clara Pérez-Ràfols, Julio Bastos-Arrieta, Núria Serrano, José Manuel Díaz-Cruz, Cristina Ariño, Joan de Pablo, Miquel Esteban
A new silver nanoparticle modified screen-printed electrode was developed and applied to the simultaneous determination of Pb(II) and Cu(II). Two different types of silver nanoparticles with different shapes and sizes, Ag nanoseeds and Ag nanoprisms, were microscopically characterized and three different carbon substrates, graphite, graphene and carbon nanofibers, were tested. The best analytical performance was achieved for the combination of Ag nanoseeds with a carbon nanofiber modified screen-printed electrode...
June 21, 2017: Sensors
https://www.readbyqxmd.com/read/28633520/ion-selective-nanosensor-for-photoacoustic-and-fluorescence-imaging-of-potassium
#2
Chang Heon Lee, Jeff Folz, Wuliang Zhang, Janggun Jo, Joel W Y Tan, Xueding Wang, Raoul Kopelman
Ion-selective optodes (ISOs), the optical analog of ion-selective electrodes, have played an increasingly important role in chemical and biochemical analysis. Here we extend this technique to ion-selective photo-acoustic optodes (ISPAOs) that serve at the same time as fluorescence-based ISOs, and apply it specifically to potassium (K+). Notably, the potassium ion is one of the most abundant cations in biological systems, involved in numerous physiological and pathological processes. Furthermore, it has been recently reported that the presence of abnormal extracellular potassium concentrations in tumors suppresses the immune responses and thus suppresses immunotherapy...
June 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28629807/spike-or-not-a-spike-that-is-the-question-in-a-patient-with-single-lead-pacemaker
#3
Antonio Rojas-González, Alberto Cecconi, Jose L Merino, Luis J Jimenez-Borreguero, Fernando Alfonso
Dual-chamber pacing is feasible via the floating atrial sensor electrodes of a single-pass VDD lead but the atrial lead threshold is higher than the accepted clinical standard. Furthermore, due to the floating nature of the system, atrial sensing and pacing thresholds may vary during the follow up. For these reasons this strategy is seldom considered a common pacing solution in routine clinical practice. Alternatively, this phenomenon is likely to be observed as a result of incorrect generator configuration...
June 8, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28629098/carbon-nanotube-ensembled-hybrid-nanocomposite-electrode-for-direct-electrochemical-detection-of-epinephrine-in-pharmaceutical-tablets-and-urine
#4
K Koteshwara Reddy, M Satyanarayana, K Yugender Goud, K Vengatajalabathy Gobi, Hern Kim
An efficient electrochemical sensor for selective detection of the neurotransmitter, epinephrine (Epn), has been fabricated with the aid of a functionalized multiwall carbon nanotube-chitosan biopolymer nanocomposite (Chit-fCNT) electrode. Multiwall carbon nanotubes (CNT) were successfully functionalized with the aid of nitric acid and confirmed by the Raman spectral data. Functionalized carbon nanotubes (fCNT) were dispersed in chitosan solution and the resulting bio-nanocomposite was used for the fabrication of sensor surface by drop and cast method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629017/design-of-a-new-nanocomposite-between-bismuth-nanoparticles-and-graphene-oxide-for-development-of-electrochemical-sensors
#5
Eduardo H Bindewald, Arthur F Schibelbain, Maurício A P Papi, Eduardo G C Neiva, Aldo J G Zarbin, Márcio F Bergamini, Luiz H Marcolino-Júnior
This study describes a new route for preparation of a nanocomposite between graphene oxide (GO) and bismuth nanoparticles (BiNPs) and its evaluation as modifier electrode for development of electrochemical sensors. BiNPs were synthesized under ultrasound conditions using Bi(NO3)3 as metal precursor and ascorbic acid (AA) as reducing agent/passivating. Some experimental parameters of BiNPs synthesis such as Bi(3+):AA molar ratio and reaction time were conducted aiming the best voltammetric performance of the sensor...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28627873/ni-and-nio-nanoparticles-decorated-metal-organic-framework-nanosheets-facile-synthesis-and-high-performance-nonenzymatic-glucose-detection-in-human-serum
#6
Yun Shu, Yan Yan, Jingyuan Chen, Qin Xu, Huan Pang, Xiaoya Hu
Ni-MOF (metal-organic framework)/Ni/NiO/carbon frame nanocomposite was formed by combing Ni, NiO nanoparticles, C frame with Ni-MOF using an efficient one-step calcination method. The morphology and structure of Ni-MOF/Ni/NiO/C nanocomposite were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and energy disperse spectroscopy (EDS) mapping. Ni-MOF/Ni/NiO/C nanocomposites were immobilized onto glassy carbon electrodes (GCEs) with Nafion film to construct high performance nonenzymatic glucose and H2O2 electrochemical sensors...
June 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28627257/toward-the-development-of-a-glucose-dehydrogenase-based-saliva-glucose-sensor-without-the-need-for-sample-preparation
#7
Chi Lin, Breanna Pratt, Mackenzie Honikel, Alaina Jenish, Bhavna Ramesh, Amnah Alkhan, Jeffrey T La Belle
BACKGROUND: Strict glycemic control is known to be a vital key in the management of diabetes mellitus (DM). However, traditional methods face limitations in their efficacy due to the pain and invasiveness of needle pricking which often discourages DM patients from performing the required number of tests per day. Saliva glucose (SG) sensing has long been considered a noninvasive alternative to blood glucose monitoring for diabetes management, however the sample preparation and sensor detection limit have been deemed as challenges to overcome...
June 1, 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28623817/development-of-a-simple-and-convenient-cell-based-electrochemical-biosensor-for-evaluating-the-individual-and-combined-toxicity-of-don-zen-and-afb1
#8
Shuang Xia, Pei Zhu, Fuwei Pi, Yinzhi Zhang, Yun Li, Jiasheng Wang, Xiulan Sun
A simple and convenient cell-based electrochemical biosensor was developed to assess the individual and combined toxicity of deoxynivalenol (DON), zearalenone (ZEN), and Aflatoxin B1 (AFB1) on Hep G2 cells. The sensor was modified in succession with AuNPs (gold nanoparticles), cysteamine, and laminin. The cells interacting with laminin formed tight cell-to-electrode contacts, and collagen was used to maintain cell adhesion and viability. Electrochemical impedance spectroscopy (EIS) was developed to evaluate mycotoxin toxicity...
June 14, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28622664/mechanical-imaging-of-soft-tissues-with-a-highly-compliant-tactile-sensing-array
#9
Bin Li, Ye Shi, Adam K Fontecchio, Yon Visell
The mechanical imaging of lumps in tissues via surface measurements can permit the noninvasive detection of disease-related differences in body tissues. In routine clinical palpation, physicians frequently make decisions based on mechanical properties that they infer from tactile information felt via touch, but these examinations currently yield little quantitative information. This has motivated the development of electronic methods for mechanical imaging. However, conventional tactile sensors are rigid, unable to conform to curved geometries, and are not adaptable to the shape of all body parts, limiting their applicability in biomedical sensing applications...
June 13, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28622643/simultaneously-electrochemical-detection-of-micrornas-based-on-multifunctional-magnetic-nanoparticles-probe-coupling-with-hybridization-chain-reaction
#10
Yan-Hong Yuan, Yi-Di Wu, Bao-Zhu Chi, Shao-Hua Wen, Ru-Ping Liang, Jian-Ding Qiu
We report a sensor combining two distinguishable magnetic nanoprobes (DNA1/Fe3O4 NPs/Thi and DNA2/Fe3O4 NPs/Fc) with target-triggered hybridization chain reaction (HCR) strategy for the simultaneous detection of microRNA-141 (miR-141) and microRNA-21 (miR-21). In the presence of targets, the thiol-modified hairpin capture probes (HCP1 and HCP2) specifically hybridize with miR-141 and miR-21 on a gold electrode, leading to the conformation change of HCP1 and HCP2, respectively. The conformation change subsequently triggers HCR to generate plentiful bonding sequences of magnetic nanoprobes...
June 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28622555/very-sensitive-electrochemical-determination-of-diuron-on-glassy-carbon-electrode-modified-with-reduced-graphene-oxide-gold-nanoparticle-nafion-composite-film
#11
K Zarei, A Khodadadi
In this work, a very sensitive electrochemical sensor based on glassy carbon electrode (GCE) modified with reduced graphene oxide-gold nanoparticles/Nafion (rGO-AuNPs/Nafion) composite film was applied to determine diuron. Synthesized GO was characterized using X-ray diffraction (XRD) and UV-visible spectroscopy. The surface morphology of the rGO-AuNPs/Nafion film was also characterized using scanning electron microscopy and electrochemical impedance spectroscopy. Cyclic voltammetry (CV) and adsorptive differential pulse voltammetry (AdDPV) were applied to investigate the electrochemical response of the diuron on the modified electrode...
June 13, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28621385/electroanalytical-determination-of-escitalopram-oxalate-using-nickel-nanoparticles-modified-carbon-paste-sensor
#12
Kamal Attia, A Mona Mohamed, M Amany Fekry
A sensitive voltammetric method was described for the determination of escitalopram oxalate based on electrocatalytic oxidation at nickel nanoparticles modified chloranil carbon paste sensor in Britton-Robinson buffer (pH range from 2 to 10). The modified electrode was characterized by scanning electron microscopy, electrochemical impedance and cyclic voltammetry. The investigation of electrochemical behavior of escitalopram oxalate was performed using cyclic voltammetry and differential pulse voltammetry. The anodic peak current showed a linear range from 1...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28621376/current-and-future-directions-in-electron-transfer-chemistry-of-graphene
#13
REVIEW
Amir Kaplan, Zhe Yuan, Jesse D Benck, Ananth Govind Rajan, Ximo S Chu, Qing Hua Wang, Michael S Strano
The participation of graphene in electron transfer chemistry, where an electron is transferred between graphene and other species, encompasses many important processes that have shown versatility and potential for use in important applications. Examples of these processes range from covalent functionalization of graphene to modify its properties and incorporate different functional groups, to electrochemical reactions and selective etching. In this paper, we review recent developments in these areas of the electron transfer chemistry of graphene...
June 16, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28618382/electrochemical-determination-of-morin-in-kiwi-and-strawberry-fruit-samples-using-vanadium-pentoxide-nano-flakes
#14
Ragu Sasikumar, Mani Govindasamy, Shen-Ming Chen, Yu Chieh-Liu, Palraj Ranganathan, Syang-Peng Rwei
Herein, we report the synthesis of Vanadium Pentoxide Nanoflakes (V2O5 NF) using ionic liquid and employed the V2O5 NF in electrochemical determination of Morin (MR) in fruit samples. The V2O5 NF were characterized by Powder X-ray diffraction (PXRD), scanning electron microscope (SEM), energy-dispersive X-ray analyzer (EDX), differential pulse voltammetry (DPV), and cyclic voltammetry (CV). Remarkably, the as-synthesized V2O5 NF exhibited excellent electrochemical behavior and electrochemical ability towards MR...
March 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28617343/study-of-the-relation-between-the-resonance-behavior-of-thickness-shear-mode-tsm-sensors-and-the-mechanical-characteristics-of-biofilms
#15
Pedro Castro, Luis Elvira, Juan Ramón Maestre, Francisco Montero de Espinosa
This work analyzes some key aspects of the behavior of sensors based on piezoelectric Thickness Shear Mode (TSM) resonators to study and monitor microbial biofilms. The operation of these sensors is based on the analysis of their resonance properties (both resonance frequency and dissipation factor) that vary in contact with the analyzed sample. This work shows that different variations during the microorganism growth can be detected by the sensors and highlights which of these changes are indicative of biofilm formation...
June 15, 2017: Sensors
https://www.readbyqxmd.com/read/28617330/identification-of-pathogenic-factors-in-klebsiella-pneumoniae-using-impedimetric-sensor-equipped-with-biomimetic-surfaces
#16
Duyen Thi Ngoc Huynh, Ah-Young Kim, Young-Rok Kim
K.pneumoniae is an opportunistic pathogen that causes nosocomial infections, such as, pneumonia, urinary tract infections, septic shock, and gastro intestinal disease. Lipopolysaccharide (LPS), capsular polysaccharide, and fimbriae are recognized major virulence factors of K.pneumoniae and play key roles during early stages of infections. In this study, we functionalized the surface of gold electrode with mannose and mucin to monitor the adhesion-associated virulence factors of K.pneumoniae. The binding characteristics of K...
June 15, 2017: Sensors
https://www.readbyqxmd.com/read/28616394/new-method-of-sudomotor-function-measurement-to-detect-microvascular-disease-and-sweat-gland-nerve-or-unmyelinated-c-fiber-dysfunction-in-adults-with-retinopathy
#17
John E Lewis, Steven E Atlas, Ammar Rasul, Ashar Farooqi, Laura Lantigua, Oscar L Higuera, Andrea Fiallo, Lianette Laria, Renata Picciani, Ken Wals, Zohar Yehoshua, Armando Mendez, Janet Konefal, Sharon Goldberg, Judi Woolger
BACKGROUND: Diabetes-associated microvascular complications such as retinopathy and neuropathy often lead to end-organ and tissue damage. Impaired skin microcirculation often precedes the detection of other advanced diabetic complications. The ANS-1 system contains a redesigned sympathetic skin response (ANS-1 SSR) device that measures sudomotor function, a photoplethysmography sensor, and a blood pressure device to comprehensively assess cardiac autonomic neuropathy and endothelial dysfunction...
2017: Journal of Diabetes and Metabolic Disorders
https://www.readbyqxmd.com/read/28613833/pt-decorated-mwcnts-ionic-liquid-composite-based-hydrogen-peroxide-sensor-to-study-microbial-metabolism-using-scanning-electrochemical-microscopy
#18
Vrushali Subhash Joshi, Jens Kreth, Dipankar Koley
Hydrogen peroxide (H2O2) is a highly relevant metabolite in many biological processes, including oral microbiome. To study this metabolite, we developed a 25 μm diameter, highly sensitive, non-enzymatic H2O2 sensor with a detection limit of 250 nM and a broad linear range of 250 nM to 7 mM. The sensor used the synergistic activity of the catalytically active Pt nanoparticles on a high surface area multiwall carbon nanotube and conducting ionic liquid matrix to achieve high sensitivity (2.4 ± 0.24 mA cm(-2) mM(-1)) for H2O2 oxidation...
June 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28613237/major-depression-detection-from-eeg-signals-using-kernel-eigen-filter-bank-common-spatial-patterns
#19
Shih-Cheng Liao, Chien-Te Wu, Hao-Chuan Huang, Wei-Teng Cheng, Yi-Hung Liu
Major depressive disorder (MDD) has become a leading contributor to the global burden of disease; however, there are currently no reliable biological markers or physiological measurements for efficiently and effectively dissecting the heterogeneity of MDD. Here we propose a novel method based on scalp electroencephalography (EEG) signals and a robust spectral-spatial EEG feature extractor called kernel eigen-filter-bank common spatial pattern (KEFB-CSP). The KEFB-CSP first filters the multi-channel raw EEG signals into a set of frequency sub-bands covering the range from theta to gamma bands, then spatially transforms the EEG signals of each sub-band from the original sensor space to a new space where the new signals (i...
June 14, 2017: Sensors
https://www.readbyqxmd.com/read/28611621/whole-body-awareness-for-controlling-a-robotic-transfemoral-prosthesis
#20
Andrea Parri, Elena Martini, Joost Geeroms, Louis Flynn, Guido Pasquini, Simona Crea, Raffaele Molino Lova, Dirk Lefeber, Roman Kamnik, Marko Munih, Nicola Vitiello
Restoring locomotion functionality of transfemoral amputees is essential for early rehabilitation treatment and for preserving mobility and independence in daily life. Research in wearable robotics fostered the development of innovative active mechatronic lower-limb prostheses designed with the goal to reduce the cognitive and physical effort of lower-limb amputees in rehabilitation and daily life activities. To ensure benefits to the users, active mechatronic prostheses are expected to be aware of the user intention and properly interact in a closed human-in-the-loop paradigm...
2017: Frontiers in Neurorobotics
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