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Design Concepts in Absorbance Optical Systems for Analytical Ultracentrifugation

03.07.2018 | Joseph Pearson; Marcel Hofstetter; Thomas Dekorsy; Michael Totzeck; Helmut Coelfen, Analyst, 2018

Analytical ultracentrifugation is a powerful technique for analyzing particles in solution, and has proved valuable for a wide range of applications in chemistry, biochemistry and material sciences for many years. The field is presently seeing a resurgence of instrument development from ...

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A novel mechanism for user-friendly and self-activated microdroplet generation capable of programmable control

03.07.2018 | Yangyang Jiang; Lin Du; Yuanming Li; Quanquan Mu; Zhongxu Cui; Jia Zhou; Wenming Wu, Analyst, 2018

Unlike conventional approaches that require bulky and expensive pumping equipment, herein, we present a simple method for self-activated microdroplet generation and transport inside a long microchannel. The high gas-pressure in the syringes is used to provide the built-in power of self-priming so ...

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Correction: Noncompetitive homogeneous immunodetection of small molecules based on beta-glucuronidase complementation

03.07.2018 | Jiulong Su; Jinhua Dong; Tetsuya Kitaguchi; Yuki Ohmuro-Matsuyama; Hiroshi Ueda, Analyst, 2018

Correction for ‘Noncompetitive homogeneous immunodetection of small molecules based on beta-glucuronidase complementation’ by Jiulong Su et al., Analyst, 2018, 143, 2096–2101.

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Evaluation of an improved closed-vessel conductively heated digestion system for the analysis of raw meat samples by ICP techniques

03.07.2018 | Alan Lima Vieira; Kelber Miranda; Alex Virgílio; Edilene Cristina Ferreira; J.A. Gomes Neto, Journal of Analytical Atomic Spectrometry, 2018

In this work, an improved conductively-heated digestion system (CHDS) with closed-vessels, which provides simpler, easier and safer digestions of raw chicken, beef and pork meat samples aiming for Ca, Cu, Fe, K, Mg, Mn, Na, P, S, and Zn determinations by ICP OES and As, Cd, Cr, Mo, Pb and Se by ...

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Distance–based Paper Sensor for Determination of Chloride ion Using Silver Nanoparticles

03.07.2018 | Kamonchanok Phoonsawat; Nalin Ratnarathorn; Charles Henry; Wijitar Dungchai, Analyst, 2018

We report the first development of a distance-based paper sensor for a simple, inexpensive, instrument-free, and portable determination of chloride ions. Our analysis reaction is based on the oxidative etching of silver nanoparticles (AgNPs) to form AgCl in the presence of Cl⁻ and H2O2. The H2O2 ...

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Towards Mapping Electrostatic Interactions between Kdo2-Lipid A and Cationic Antimicrobial Peptides via Ultraviolet Photodissociation Mass Spectrometry

03.07.2018 | Christopher M Crittenden; Lindsay Jane Morrison; Mignon D Fitzpatrick; Allison P Myers; Elisa T Novelli; Jake Rosenb ..., Analyst, 2018

Cationic antimicrobial peptides (CAMPs) have known to act as multi-modal weapons against Gram-negative bacteria. As a new approach to investigate the nature of the interactions between CAMPs and the surfaces of bacteria, native mass spectrometry and two MS/MS strategies (ultraviolet ...

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Hydrogel electrodeposition based on bipolar electrochemistry

03.07.2018 | Kosuke Ino; Tomoaki Matsumoto; Noriko Taira; Tatsuki Kumagai; Yuji Nashimoto; Hitoshi Shiku, Lab on a Chip, 2018

Bipolar electrochemistry has attracted great interest for applications based on sensing, electrografting, and electrodeposition, because the technique enables electrochemical reactions to be induced at multiple bipolar electrodes (BPEs) with only a single power supply. However, there are only a ...

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Chemical separation and MC-ICPMS analysis of U, Th, Pa and Ra isotope ratios of carbonates

03.07.2018 | Johanna Christina Obert; Denis Scholz; Jörg Lippold; Thomas Felis; Klaus Peter Jochum; Meinrat O. Andreae, Journal of Analytical Atomic Spectrometry, 2018

Diagenetic alteration of fossil reef corals may have severe effects on the reliability of 230Th/U-ages. The widely applied criteria introduced to test for the reliability of coral 230Th/U-ages are often not sufficient to identify all altered ages. The combination of 230Th/U- with 231Pa/U-dating ...

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Towards a general acid-based method for the determination of gold in ore samples by inductively-coupled plasma-mass spectrometry (ICP-MS), together with an investigation of solvent extraction of gold for analytical determination by microwave-induced plasma-atomic emission spectrometry (MIP-AES)

03.07.2018 | Wryan Helmeczi; William Erick Helmeczi; Laura Agnes Baker; Yong Wang; I D Brindle, Journal of Analytical Atomic Spectrometry, 2018

In this paper, we explore a variety of aqueous digestion techniques for the determination of gold, in a wide variety of mineral matrices. These include feldspar, basalt, pyrites, and other gold-containing minerals. The acid-based digestion methods compete effectively with fire assay to deliver ...

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Formation of arrays of planar, murine, intestinal crypts possessing a stem/proliferative cell compartment and differentiated cell zone

03.07.2018 | Raehyun Kim; Yuli Wang; Shee-Hwan J. Hwang; Peter J. Attayek; Nicole M. Smiddy; Mark I. Reed; Christopher E. Sims; N ..., Lab on a Chip, 2018

A simple, in vitro intestinal model recapitulating key aspects of crypt architecture and physiology would facilitate our understanding the impact of drugs, foods and microbial metabolites on the intestine. To address the limitations of previously reported intestinal in vitro platforms, we ...

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