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https://www.readbyqxmd.com/read/27920895/organosilane-functionalization-of-nanostructured-indium-tin-oxide-films
#1
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/27919649/maldi-tof-ms-identification-of-species-from-the-acinetobacter-baumannii-ab-group-revisited-inclusion-of-the-novel-a-seifertii-and-a-dijkshoorniae-species
#2
Marta Marí-Almirall, Clara Cosgaya, Paul G Higgins, Ado Van Assche, Murat Telli, Geert Huys, Bart Lievens, Harald Seifert, Lenie Dijkshoorn, Ignasi Roca, Jordi Vila
OBJECTIVES: Rapid identification of Acinetobacter species is critical since members of the A. baumannii (Ab) group differ in antibiotic susceptibility and clinical outcomes. A. baumannii, A. pittii and A. nosocomialis can be identified by MALDI-TOF/MS, while the novel species A. seifertii and A. dijkshoorniae cannot. Low identification rates for A. nosocomialis have also been reported. We evaluated the use of MALDI-TOF/MS to identify isolates of A. seifertii and A. dijkshoorniae and revisited the identification of A...
December 2, 2016: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/27919258/preparation-and-structural-determination-of-four-metabolites-of-senkyunolide-i-in-rats-using-ultra-performance-liquid-chromatography-quadrupole-time-of-flight-tandem-mass-and-nuclear-magnetic-resonance-spectra
#3
Qiang Ma, Cong Ma, Fei Wu, Yao-Kun Xiong, Yi Feng, Shuang Liang
BACKGROUND: Senkyunolide I (SEI) is one of the most important bioactive phthalides of Ligusticum chuanxiong Hort. (Umbelliferae), a Traditional Chinese Medicine. Our previous studies suggested that it might be developed as a potential treatment for migraine. METHODS: In this paper, we aimed to isolate and characterize the main metabolites of SEI after gavage feeding in rats. Their structures were identified precisely on the basis of nuclear magnetic resonance (NMR) spectroscopy and UPLC/Q-TOF-MS spectrometry...
December 5, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27918030/solvation-behavior-of-carbonate-based-electrolytes-in-sodium-ion-batteries
#4
Arthur V Cresce, Selena M Russell, Oleg Borodin, Joshua A Allen, Marshall A Schroeder, Michael Dai, Jing Peng, Mallory P Gobet, Steven G Greenbaum, Reginald E Rogers, Kang Xu
Sodium ion batteries are on the cusp of being a commercially available technology. Compared to lithium ion batteries, sodium ion batteries can potentially offer an attractive dollar-per-kilowatt-hour value, though at the penalty of reduced energy density. As a materials system, sodium ion batteries present a unique opportunity to apply lessons learned in the study of electrolytes for lithium ion batteries; specifically, the behavior of the sodium ion in an organic carbonate solution and the relationship of ion solvation with electrode surface passivation...
December 5, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27916116/atmospheric-pressure-solution-cathode-glow-discharge-a-versatile-ion-source-for-atomic-and-molecular-mass-spectrometry
#5
Andrew J Schwartz, Kelsey L Williams, Gary M Hieftje, Jacob T Shelley
An atmospheric-pressure solution-cathode glow discharge (SCGD) has been evaluated as an ion source for atomic, molecular, and ambient desorption/ionization mass spectrometry. The SCGD consists of a direct-current plasma, supported in the ambient air in the absence of gas flows, and sustained upon the surface of a flowing liquid cathode. Analytes introduced in the flowing liquid, as an ambient gas, or as a solid held near the plasma are vaporized and ionized by interactions within or near the discharge. Introduction of acidic solutions containing metal salts produced bare elemental ions as well as H2O, OH(-) and NO3(-) adducts...
January 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27914015/electron-transfer-dissociation-of-all-ions-at-all-times-ms-etd-in-a-quadrupole-time-of-flight-q-tof-mass-spectrometer
#6
Christian N Cramer, Jeffery M Brown, Nick Tomczyk, Peter Kresten Nielsen, Kim F Haselmann
Data-independent mass spectral acquisition is particularly powerful when combined with ultra-performance liquid chromatography (LC) that provides excellent separation of most components present in a given sample. Data-independent analysis (DIA) consists of alternating full MS scans and scans with fragmentation of all ions within a selected m/z range, providing precursor masses and structure information, respectively. Fragmentation spectra are acquired either by sequential isolation and fragmentation of sliding m/z ranges or fragmenting all ions entering the MS instrument with no ion isolation, termed broadband DIA...
December 2, 2016: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/27912165/biomarker-analysis-of-american-toad-anaxyrus-americanus-and-grey-tree-frog-hyla-versicolor-tadpoles-following-exposure-to-atrazine
#7
Marcía N Snyder, W Matthew Henderson, Donna A Glinski, S Thomas Purucker
The objective of the current study was to use a biomarker-based approach to investigate the influence of atrazine exposure on American toad (Anaxyrus americanus) and grey tree frog (Hyla versicolor) tadpoles. Atrazine is one of the most frequently detected herbicides in environmental matrices throughout the United States. In surface waters, it has been found at concentrations from 0.04-2859μg/L and thus presents a likely exposure scenario for non-target species such as amphibians. Studies have examined the effect of atrazine on the metamorphic parameters of amphibians, however, the data are often contradictory...
November 21, 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27908498/hydrophilic-interaction-and-reversed-phase-mixed-mode-liquid-chromatography-coupled-to-high-resolution-tandem-mass-spectrometry-for-polar-lipids-analysis
#8
Sara Granafei, Pietro Azzone, Vito Alessandro Spinelli, Ilario Losito, Francesco Palmisano, Tommaso R I Cataldi
A hydrophilic interaction liquid chromatography (HILIC) fused-core column (150×2.1mm ID, 2.7μm particle size) and a short reversed-phase liquid chromatography (RPLC) column (20mm×2.1mm ID, 1.9μm) were serially coupled to perform mixed-mode chromatography (MMC) on complex mixtures of phospholipids (PL). Mobile phase composition and gradient elution program were, preliminarily, optimized using a mixture of phosphatidylcholines (PC), phosphatidylethanolamines (PE), their corresponding lyso-forms (LPC and LPE), and sphingomyelins (SM)...
November 25, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27903894/dbsap-single-amino-acid-polymorphism-database-for-protein-variation-detection
#9
Ruifang Cao, Yan Shi, Shuangguan Chen, Yimin Ma, Jiajun Chen, Juan Yang, Geng Chen, Tieliu Shi
Millions of human single nucleotide polymorphisms (SNPs) or mutations have been identified so far, and these variants could be strongly correlated with phenotypic variations of traits/diseases. Among these variants, non-synonymous ones can result in amino-acid changes that are called single amino-acid polymorphisms (SAPs). Although some studies have tried to investigate the SAPs, only a small fraction of SAPs have been identified due to inadequately inferred protein variation database and the low coverage of mass spectrometry (MS) experiments...
November 29, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27899890/causal-role-of-thalamic-interneurons-in-brain-state-transitions-a-study-using-a-neural-mass-model-implementing-synaptic-kinetics
#10
Basabdatta Sen Bhattacharya, Thomas P Bond, Louise O'Hare, Daniel Turner, Simon J Durrant
Experimental studies on the Lateral Geniculate Nucleus (LGN) of mammals and rodents show that the inhibitory interneurons (IN) receive around 47.1% of their afferents from the retinal spiking neurons, and constitute around 20-25% of the LGN cell population. However, there is a definite gap in knowledge about the role and impact of IN on thalamocortical dynamics in both experimental and model-based research. We use a neural mass computational model of the LGN with three neural populations viz. IN, thalamocortical relay (TCR), thalamic reticular nucleus (TRN), to study the causality of IN on LGN oscillations and state-transitions...
2016: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/27895544/mesoporous-silica-chip-enabled-peptide-profiling-as-an-effective-platform-for-controlling-bio-sample-quality-and-optimizing-handling-procedure
#11
Kai Liang, Hongmei Wu, Tony Y Hu, Yan Li
BACKGROUND: High quality clinical samples are critical for meaningful interpretation of data obtained in both basic and translational medicine. More specifically, optimized pre-analysis handling to bio-sample is crucial for avoiding biased analysis in a clinical setting. A universally applicable method for the evaluation of sample quality and pre-analysis handling is therefore in great demand. METHODS: The fingerprint pattern of low molecular weight (LMW) peptides in sera is directly associated with sample quality and handling process...
2016: Clinical Proteomics
https://www.readbyqxmd.com/read/27894769/identification-of-molecular-species-of-monoalkyldiacylglycerol-from-the-squid-berryteuthis-magister-using-liquid-chromatography-apci-high-resolution-mass-spectrometry
#12
Viacheslav G Rybin, Andrey B Imbs, Darja A Demidkova, Ekaterina V Ermolenko
Monoalkyldiacylglycerol (MADAG) is an important lipid class in mollusks, corals, starfishes, and some species of zooplankton. Up to 80% of liver oils of squids and sharks are comprised of MADAG. Except for one fish species, there are no data on the composition of MADAG molecular species of marine organisms. The molecular species of MADAG obtained from digestive glands of the deep-sea squid Berryteuthis magister were identified. High-performance liquid chromatography (HPLC) and tandem high-resolution mass spectrometry (HRMS) with atmospheric pressure chemical ionization (APCI) were applied...
November 25, 2016: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/27893749/differential-protein-expression-in-the-hemolymph-of-bithynia-siamensis-goniomphalos-infected-with-opisthorchis-viverrini
#13
Kulwadee Suwannatrai, Apiporn Suwannatrai, Pairat Tabsripair, Jariya Umka Welbat, Sirikachorn Tangkawattana, Cinzia Cantacessi, Jason Mulvenna, Smarn Tesana, Alex Loukas, Javier Sotillo
Bithynia siamensis goniomphalos is a freshwater snail that serves as the first intermediate host of the human liver fluke Opisthorchis viverrini. This parasite is a major public health problem in different countries throughout the Greater Mekong sub-region (Thailand, southern Vietnam, Lao PDR and Cambodia). Chronic O. viverrini infection also results in a gradual increase of fibrotic tissues in the biliary tract that are associated with hepatobiliary diseases and contribute to cholangiocarcinoma (a fatal type of bile duct cancer)...
November 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27891187/mass-spectrometry-of-analytical-derivatives-2-ortho-and-para-effects-in-electron-ionization-mass-spectra-of-derivatives-of-hydroxy-mercapto-and-amino-benzoic-acids
#14
Nino G Todua, Anzor I Mikaia
Derivatives requiring either anhydrous or aqueous reaction conditions were prepared for robust and reliable gas chromatography/mass spectrometry (GC/MS) characterization of hydroxyl, mercapto, and amino benzoic acids Methylation and trialkylsilytation are employed for blocking the acidic function. Alkyl, trimethylsilyl, acetyl, perfluoroacyl and alkoxycarbonyl derivatization groups are introduced to hydroxyl, mercapto and amino functions. The electron ionization induced fragmentation characteristics of corresponding derivatives are explained by comparing the MS(1) spectra of unlabeled compounds to their (2)H and (13)C labeled analogs, and analysis of collision-induced dissociation data from MS(2) spectra...
2016: Mass Spektrom
https://www.readbyqxmd.com/read/27889549/assessing-arsenic-and-selenium-in-a-single-nail-clipping-using-portable-x-ray-fluorescence
#15
David E B Fleming, Michel N Nader, Kelly A Foran, Craig Groskopf, Michael C Reno, Chris S Ware, Mina Tehrani, Diana Guimarães, Patrick J Parsons
The feasibility of measuring arsenic and selenium contents in a single nail clipping was investigated using a small-focus portable X-ray fluorescence (XRF) instrument with monochromatic excitation beams. Nail clipping phantoms supplemented with arsenic and selenium to produce materials with 0, 5, 10, 15, and 20µg/g were used for calibration purposes. In total, 10 different clippings were analyzed at two different measurement positions. Energy spectra were fit with detection peaks for arsenic Kα, selenium Kα, arsenic Kβ, selenium Kβ, and bromine Kα characteristic X-rays...
November 19, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/27888481/rapid-bacteria-identification-from-environmental-mining-samples-using-maldi-tof-ms-analysis
#16
Ingrid Regina Avanzi, Louise Hase Gracioso, Marcela Dos Passos Galluzzi Baltazar, Bruno Karolski, Elen Aquino Perpetuo, Claudio Augusto Oller do Nascimento
Copper mining has polluted soils and water, causing a reduction of the microbial diversity and a change in the structure of the resident bacterial communities. In this work, selective isolation combined with MALDI-TOF MS and the 16S rDNA method were used for characterizing cultivable bacterial communities from copper mining samples. The results revealed that MALDI-TOF MS analysis can be considered a reliable and fast tool for identifying copper-resistant bacteria from environmental samples at the genera level...
November 25, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27886759/capillary-electrophoresis-tandem-mass-spectrometry-combined-with-molecularly-imprinted-solid-phase-extraction-as-useful-tool-for-the-monitoring-of-5-nitroimidazoles-and-their-metabolites-in-urine-samples
#17
Maykel Hernández-Mesa, Carmen Cruces-Blanco, Ana M García-Campaña
A novel capillary electrophoresis-tandem mass spectrometry approach is proposed for the determination of eleven 5-nitroimidazoles in urine samples for therapeutical drug monitoring purposes. A comparison between two separation modes, namely micellar electrokinetic chromatography and capillary zone electrophoresis was carried out, obtaining higher selectivity when 1M formic acid (pH 1.8) was selected as background electrolyte. 5-Nitroimidazoles were hydrodynamically injected in water for 40s at 50mbar and their separation was performed at 28kV and 25°C...
January 15, 2017: Talanta
https://www.readbyqxmd.com/read/27882893/protocol-mythbusters-a-universal-procedure-for-sample-preparation-for-mass-spectrometry
#18
Anna Drabik, Joanna Ner-Kluza, Anna Bodzon-Kulakowska, Piotr Suder
Improvements in proteomic strategies from the development of new and robust separation and identification techniques have led to broad applications of proteomics to solve numerous biological questions. For all analyses, sample quality is unquestionably a critical factor; therefore protein extraction is of outmost importance. The ideal extraction method should provide reproducible spectra of the most comprehensive repertoire of proteins, while minimizing sample loss and degradation. It is already known that to capture the whole proteome is an unenforceable task...
2016: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/27882886/technical-note-air-compared-to-nitrogen-as-nebulizing-and-drying-gases-for-electrospray-ionization-mass-spectrometry
#19
P Mielczarek, J Silberring, M Smoluch
In the present study we tested the application of compressed air instead of pure nitrogen as the nebulizing and drying gas, and its influence on the quality of electrospray ionization (ESI) mass spectra. The intensities of the signals corresponding to protonated molecules were significantly (twice) higher when air was used. Inspection of signal-to-noise (S/N) ratios revealed that, in both cases, sensitivity was comparable. A higher ion abundance after the application of compressed air was followed by a higher background...
2016: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/27882885/protocol-a-simple-protocol-for-quantitative-analysis-of-bio-oils-through-gas-chromatography-mass-spectrometry
#20
Mattia Bartoli, Luca Rosi, Marco Frediani, Piero Frediani
A new and simple protocol for quantitative analysis of bio-oils using gas-chromatography/mass spectrometry is suggested. Compounds were identified via their mass spectra, and then unavailable response factors were calculated with respect to diphenyl as the internal standard using a modified method previously suggested for gas chromatography with flame ionization detection. This new protocol was applied to the characterization of bio-oils obtained from the pyrolysis of woods of different sources or using different pyrolysis procedures...
2016: European Journal of Mass Spectrometry
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