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Quantitative analysis of 17 amino acids in tobacco leaves using an amino acid analyzer and chemometric resolution

10-Apr-2015 | Yihang Zeng, Wensheng Cai, Xueguang Shao, Journal of Separation Science, 2015

A method was developed for quantifying 17 amino acids in tobacco leaves by using an A300 amino acid analyzer and chemometric resolution. In the method, amino acids were eluted by the buffer solution on ion‐exchange column. After reacting with ninhydrin, the derivatives of amino acids were ...

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A dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation

07-Apr-2015 | Jocenir Boita, Marcus Vinicius Castegnaro, Maria do Carmo Martins Alves, Jonder Morais, Journal of Synchrotron Radiation, 2015

In situ time‐resolved X‐ray absorption spectroscopy (XAS) measurements collected at the Pt L3‐edge during the synthesis of Pt nanoparticles (NPs) in aqueous solution are reported. A specially designed dispenser–reactor apparatus allowed for monitoring changes in the XAS spectra from the earliest ...

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Sensors, Vol. 15, Pages 8020-8041: Piezoelectric Micromachined Ultrasound Transducer (PMUT) Arrays for Integrated Sensing, Actuation and Imaging

03-Apr-2015 | Qiu, Yongqiang ; Gigliotti, James V.; Wallace, Margeaux ; Griggio, Flavio ; Demore, Christine E. M.; Cochran, Sandy ..., Sensors, 2015

Many applications of ultrasound for sensing, actuation and imaging require miniaturized and low power transducers and transducer arrays integrated with electronic systems. Piezoelectric micromachined ultrasound transducers (PMUTs), diaphragm-like thin film flexural transducers typically formed on ...

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Sensors, Vol. 15, Pages 7933-7952: A Method for Improving the Pose Accuracy of a Robot Manipulator Based on Multi-Sensor Combined Measurement and Data Fusion

02-Apr-2015 | Liu, Bailing ; Zhang, Fumin ; Qu, Xinghua, Sensors, 2015

An improvement method for the pose accuracy of a robot manipulator by using a multiple-sensor combination measuring system (MCMS) is presented. It is composed of a visual sensor, an angle sensor and a series robot. The visual sensor is utilized to measure the position of the manipulator in real ...

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Combining Alkaline Extraction and in Situ Plated Bismuth Film for Reliable Quantification of Zn in Multivitamin Formulations

01-Apr-2015 | Wilson T. Fonseca, Regina M. Takeuchi, André L. Santos, Electroanalysis, 2015

Abstract In this work a bismuth film electrode (BiFE) plated in situ onto glassy carbon was used to quantify Zn2+ in multivitamin formulation samples by square wave anodic stripping voltammetry. For partially water‐soluble multivitamin tablets, an alkaline extraction with 1.0 mol L−1 NaOH ...

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Role of PO4 tetrahedron in LiFePO4 and FePO4 system

01-Apr-2015 | Yuewu Zeng, Microscopy Research and Technique, 2015

ABSTRACT Using high resolution transmission electron microscopy with image simulation and Fourier analysis, the Li1−xFePO4 (x 1−x FePO4 (x ∼ 0.5), and FePO4 particles, prepared by charging or discharging the 053048 electrochemical cells (thickness: 5 mm, width: 30 mm, height: 48 mm) and ...

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Aptamer-based colorimetric biosensing of abrin using catalytic gold nanoparticles

01-Apr-2015 | Jingting Hu; Pengjuan Ni; Haichao Dai; Yujing Sun; Yilin Wang; shu jiang; Zhuang Li, Analyst, 2015

In this study we propose a simple and sensitive colorimetric aptasensor for the quantitative analysis of abrin by using catalytic AuNPs for the first time. AuNPs possessed the peroxidase-like activity that could catalyse 3, 3, 5, 5-tetramethylbenzidine (TMB) in the presence of H2O2 , to produce a ...

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Solvent-Induced Structural Transitions of Lysozyme in an Electrospray Ionization Source

01-Apr-2015 | Jong Wha Lee; Hugh Inkon Kim, Analyst, 2015

The structural characterization of proteins using electrospray ionization mass spectrometry (ESI-MS) has become an important method for understanding protein structural dynamics. The correlation between the structures of proteins in solution and gas phase needs to be understood for the ...

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Sensors, Vol. 15, Pages 7898-7912: A Simple Method for Decreasing the Liquid Junction Potential in a Flow-through-Type Differential pH Sensor Probe Consisting of pH-FETs by Exerting Spatiotemporal Control of the Liquid Junction

01-Apr-2015 | Yamada, Akira ; Mohri, Satoshi ; Nakamura, Michihiro ; Naruse, Keiji, Sensors, 2015

The liquid junction potential (LJP), the phenomenon that occurs when two electrolyte solutions of different composition come into contact, prevents accurate measurements in potentiometry. The effect of the LJP is usually remarkable in measurements of diluted solutions with low buffering ...

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Cryogenic‐temperature electron microscopy direct imaging of carbon nanotubes and graphene solutions in superacids

25-Mar-2015 | O. KLEINERMAN, A. NICHOLAS G. PARRA‐VASQUEZ, M.J. GREEN, N. BEHABTU, J. SCHMIDT, E. KESSELMAN, C.C. YOUNG, Y. COHEN, ..., Journal of Microscopy, 2015

Summary Cryogenic electron microscopy (cryo‐EM) is a powerful tool for imaging liquid and semiliquid systems. While cryogenic transmission electron microscopy (cryo‐TEM) is a standard technique in many fields, cryogenic scanning electron microscopy (cryo‐SEM) is still not that widely used and ...

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