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Blessing of randomness against the curse of dimensionality

Published: Nov 9, 2017

Author(s): Sergey Kucheryavskiy

Journal: Journal of Chemometrics

Modern hyperspectral images, especially acquired in remote sensing and from on‐field measurements, can easily contain from hundreds of thousands to several millions of pixels. This often leads to a quite long computational time when, eg, the images are decomposed by Principal Component Analysis (PCA) or similar algorithms. In this paper, we are going to show how randomization can tackle this problem. The main idea is described in detail...

Read More thumbnail image: Blessing of randomness against the curse of dimensionality

Chromatographic determination, decline dynamic and risk assessment of sulfoxaflor in Asian pear and oriental melon

Published: Nov 8, 2017

Author(s): Md. Humayun Kabir, A. M. Abd El‐Aty, Md. Musfiqur Rahman, Hyung Suk Chung, Han Sol Lee, Sung Woo Kim, Hee‐Ra Chang, Ho‐Chul Shin, Sung Shik Shin, Jae‐Han Shim

Journal: Biomedical Chromatography

Abstract The dissipation pattern of sulfoxaflor in Asian pear cultivated in an open field conditions and in oriental melon grown under plastic house conditions was each studied in two different locations. Residues in field‐treated samples were determined using liquid chromatography coupled with an ultraviolet detector and confirmed by liquid chromatography–tandem mass spectrometry. A calibration curve for sulfoxaflor was linear over...

Read More thumbnail image: Chromatographic determination decline dynamic and risk assessment of sulfoxaflor in Asian pear and oriental melon

Identification of absorbed constituents and in vivo metabolites in rats after oral administration of Physalis alkekengi var. franchetii by ultra‐high‐pressure liquid chromatography quadrupole time‐of‐flight mass spectrometry

Published: Nov 8, 2017

Author(s): Xinchi Feng, Xiaoguang Huo, Hongxia Liu, Liwei Chai, Liqin Ding, Feng Qiu

Journal: Biomedical Chromatography

Abstract The calyces of Physalis alkekengi var. franchetii (Chinese Lantern, JDL) are well‐known as traditional Chinese medicine owing to its various therapeutic effects. However, the bioactive constituents responsible for the pharmacological effects of JDL and their metabolites in vivo are still unclear to date. In this paper, an ultra‐high‐pressure liquid chromatography coupled with quadrupole time‐of‐flight mass spectrometry...

Read More thumbnail image: Identification of absorbed constituents and in vivo metabolites in rats after oral administration of Physalis alkekengi var_ franchetii by ultrahighpressure liquid chromatography quadrupole timeofflight mass spectrometry

In vivo study of the effect of lactoferrin on iron metabolism and bioavailability from different iron chemical species for formula milk fortification

Published: Nov 8, 2017

Author(s): Sonia Fernández‐Menéndez, María L. Fernández‐Sánchez, Rafaella Regina Alves Peixoto, Belén Fernández‐Colomer, Alfredo Sanz‐Medel

Journal: ELECTROPHORESIS

Abstract Iron fortification in infant formulas is a common practice for providing iron to newborns in order to avoid its deficiency (anemia). Depending on the physicochemical species used, its bioavailability might be insufficient to meet iron requirements. In this vein, the influence of Lactoferrin (Lf) presence on iron bioavailability in 2‐week‐old wistar rats fed with formula milk fortified with 57Fe(III)2‐Lf or 57Fe(II)SO4 (in presence of...

Read More thumbnail image: In vivo study of the effect of lactoferrin on iron metabolism and bioavailability from different iron chemical species for formula milk fortification

UPLC‐HR‐MS/MS‐based determination study on the metabolism of four synthetic cannabinoids, ADB‐FUBICA, AB‐FUBICA, AB‐BICA and ADB‐BICA, by human liver microsomes

Published: Nov 7, 2017

Author(s): Jing Li, Cuimei Liu, Tao Li, Zhendong Hua

Journal: Biomedical Chromatography

Abstract Since 2012, several cannabimimetic indazole and indole derivatives with valine amino acid amide residue have emerged in the illicit drug market, and have gradually replaced the old generations of synthetic cannabinoids (SCs) with naphthyl or adamantine groups. Among them, ADB‐FUBICA [N‐(1‐amino‐3,3‐dimethyl‐1‐oxobutan‐2‐yl)‐1‐(4‐fluorobenzyl)‐1H–indole‐3‐carboxamide], AB‐FUBICA...

Read More thumbnail image: UPLCHRMSMSbased determination study on the metabolism of four synthetic cannabinoids ADBFUBICA ABFUBICA ABBICA and ADBBICA by human liver microsomes

Surface properties and corrosion resistance of SF 6 plasma‐treated polyester‐based thermoplastic elastomer

Published: Nov 7, 2017

Author(s): Renato Carvalho Resende, Walter Ruggeri Waldman, Nilson Cristino Cruz, Steven F. Durrant, Elidiane Cipriano Rangel

Journal: Surface and Interface Analysis

Copolyester thermoplastic elastomers (COPE) have interesting mechanical properties but low chemical resistance in aggressive environments. Developing a treatment that would increase their chemical resistance while preserving their convenient bulk characteristics would be an advance. Radiofrequency plasma treatments in sulfur hexafluoride were undertaken. Surface properties and corrosion resistance of untreated and treated samples were...

Read More thumbnail image: Surface properties and corrosion resistance of SF 6 plasmatreated polyesterbased thermoplastic elastomer

Advanced quantitative analysis of epitaxial SiGe composition on production wafer for logic devices

Published: Nov 7, 2017

Author(s): Christopher Penley, Michael Walker, Michael Wilson, Daniel Billingsley, Arvind Raviswaran, Shane Phillips

Journal: Surface and Interface Analysis

Quantitative analyses of in situ boron‐doped SiGe composition on production wafers for 14 and 20‐nm logic devices were successfully characterized using advanced, small area Time‐of‐Flight Secondary Ion Mass Spectrometry analysis methods. The quantification of dopant levels in SiGe offered an improved method for tool‐to‐tool matching, process monitoring, and improvement, and performing this function accurately was necessary to enable...

Read More thumbnail image: Advanced quantitative analysis of epitaxial SiGe composition on production wafer for logic devices

The effect of plasma treatment on the mechanical behavior of UHMWPE fiber–reinforced thermoplastic HDPE composite

Published: Nov 7, 2017

Author(s): Runqin He, Fenglian Niu, Qiuxiang Chang

Journal: Surface and Interface Analysis

Ultra‐high‐molecular‐weight polyethylene (UHMWPE) fibers have been modified by plasma treatment to increase adhesion in high‐density polyethylene (HDPE) matrices. Results showed that surface roughness predominates for modified UHMWPE fibers, indicating that the plasma treatment favors the interaction with HDPE. Unmodified HDPE composite samples gave a lower interlaminar shear strength than did the samples that were incorporated with...

Read More thumbnail image: The effect of plasma treatment on the mechanical behavior of UHMWPE fiberreinforced thermoplastic HDPE composite

Comparison of standard‐based and standardless methods of quantification used in X‐ray fluorescence analysis: Application to the exoskeleton of clams

Published: Nov 6, 2017

Author(s): S. Pessanha, C. Fonseca, J.P. Santos, M.L. Carvalho, A.A. Dias

Journal: X-Ray Spectrometry

In this work, we aim at achieving the most accurate quantitative determination of the composition of exoskeletons of bivalves from Tagus estuary with Energy Dispersive X‐ray Fluorescence. Samples from the shells of clams ranging from the Bronze Ages to the 16th century A.D. belonging to the Museu Arqueológico de Almada, and also from the shells of clams collected recently in the same region, were analyzed for comparison of the trace...

Read More thumbnail image: Comparison of standardbased and standardless methods of quantification used in Xray fluorescence analysis Application to the exoskeleton of clams

A review of bioanalytical quantitative methods for selected sphingosine 1‐phosphate receptor modulators

Published: Nov 6, 2017

Author(s): Ranjeet Prasad Dash, Nuggehally R. Srinivas, Rana Rais

Journal: Biomedical Chromatography

Abstract Sphingosine 1‐phosphate (S1P1) modulators provide an emerging therapeutic approach for various autoimmune disorders such as multiple sclerosis and psoriasis. Fingolimod is the first approved orally active, selective and potent drug of this class. Other drugs belonging to this class include siponimod, ponesimod, ceralifimod, amiselimod, CS‐0777 and GSK2018682. However, owing to the high protein binding, polarity and...

Read More thumbnail image: A review of bioanalytical quantitative methods for selected sphingosine 1phosphate receptor modulators

Relative identifiability of anisotropic properties from magnetic resonance elastography

Published: Nov 6, 2017

Author(s): Renee Miller, Arunark Kolipaka, Martyn P. Nash, Alistair A. Young

Journal: NMR in Biomedicine

Although magnetic resonance elastography (MRE) has been used to estimate isotropic stiffness in the heart, myocardium is known to have anisotropic properties. This study investigated the determinability of global transversely isotropic material parameters using MRE and finite‐element modeling (FEM). A FEM‐based material parameter identification method, using a displacement‐matching objective function, was evaluated in a gel phantom and...

Read More thumbnail image: Relative identifiability of anisotropic properties from magnetic resonance elastography

Probing the cardiac malate–aspartate shuttle non‐invasively using hyperpolarized [1,2‐ 13 C 2 ]pyruvate

Published: Nov 6, 2017

Author(s): Albert P. Chen, Angus Z. Lau, Yi‐ping Gu, Marie A. Schroeder, Jennifer Barry, Charles H. Cunningham

Journal: NMR in Biomedicine

Previous studies have demonstrated that using hyperpolarized [2‐13C]pyruvate as a contrast agent can reveal 13C signals from metabolites associated with the tricarboxylic acid (TCA) cycle. However, the metabolites detectable from TCA cycle‐mediated oxidation of [2‐13C]pyruvate are the result of several metabolic steps. In the instance of the [5‐13C]glutamate signal, the amplitude can be modulated by changes to the rates of pyruvate dehydrogenase (PDH) flux, TCA...

Read More thumbnail image: Probing the cardiac malateaspartate shuttle noninvasively using hyperpolarized 12 13 C 2 pyruvate

Core–shell microspheres with porous nanostructured shells for liquid chromatography

Published: Nov 6, 2017

Author(s): Adham Ahmed, Kevin Skinley, Stephanie Herodotou, Haifei Zhang

Journal: Journal of Separation Science

Abstract The development of new stationary phases has been the key aspect for fast and efficient high‐performance liquid chromatography separation with relatively low backpressure. Core–shell particles, with a solid core and porous shell, have been extensively investigated and commercially manufactured in the last decade. The excellent performance of core–shell particles columns has been recorded for a wide range of analytes,...

Read More thumbnail image: Coreshell microspheres with porous nanostructured shells for liquid chromatography

Deep eutectic solvent based magnetic nanofluid in the development of stir bar sorptive dispersive microextraction: An efficient hyphenated sample preparation for ultra‐trace nitroaromatic explosives extraction in wastewater

Published: Nov 3, 2017

Author(s): Ali Reza Zarei, Maryam Nedaei, Sohrab Ali Ghorbanian

Journal: Journal of Separation Science

Abstract A deep eutectic solvent based magnetic nanofluid was coupled with stir bar sorptive dispersive microextraction as a hyphenated sample preparation technique. The neodymium core magnetic stir bar was coated physically with nanofluid of magnetic carbon nanotube nanocomposites and deep eutectic solvents. The prepared nanofluid has magnetic and strong sorbing properties and is compatible with gas chromatography. In this...

Read More thumbnail image: Deep eutectic solvent based magnetic nanofluid in the development of stir bar sorptive dispersive microextraction An efficient hyphenated sample preparation for ultratrace nitroaromatic explosives extraction in wastewater

Characterization of ancient lipids in prehistoric organic residues: Chemical evidence of livestock‐pens in rock‐shelters since early neolithic to bronze age

Published: Nov 3, 2017

Author(s): Jaime Gea, María Carmen Sampedro, Asier Vallejo, Ana Polo‐Díaz, M. Aranzazu Goicolea, Javier Fernández‐Eraso, Ramón J. Barrio

Journal: Journal of Separation Science

Abstract The characterization of ancient lipids from prehistoric sediments (fumiers) located in a rock‐selter has been possible after the optimization of an analytical method based on the microwave‐assisted extraction and solid‐phase extraction clean‐up step and a final derivatization step followed by gas chromatography with mass spectrometry. Eight sterols and two bile acids were detected just in the partially burned and unburned layers of the...

Read More thumbnail image: Characterization of ancient lipids in prehistoric organic residues Chemical evidence of livestockpens in rockshelters since early neolithic to bronze age

In vivo detection and automatic analysis of GABA in the mouse brain with MEGA‐PRESS at 9.4 T

Published: Nov 3, 2017

Author(s): Jia Guo, Zhu Gang, Yanping Sun, Andrew Laine, Scott A. Small, Douglas L. Rothman

Journal: NMR in Biomedicine

The goals of this study were to develop an acquisition protocol and the analysis tools for Meshcher–Garwood point‐resolved spectroscopy (MEGA‐PRESS) in mouse brain at 9.4 T, to allow the in vivo detection of γ‐aminobutyric acid (GABA) and to examine whether isoflurane alters GABA levels in the thalamus during anesthesia. We implemented the MEGA‐PRESS sequence on a Bruker 94/20 system with ParaVision 6.0.1, and magnetic resonance spectra were ...

Read More thumbnail image: In vivo detection and automatic analysis of GABA in the mouse brain with MEGAPRESS at 9_4T

Improved resolution of glutamate, glutamine and γ‐aminobutyric acid with optimized point‐resolved spectroscopy sequence timings for their simultaneous quantification at 9.4 T

Published: Nov 3, 2017

Author(s): Brennen J. Dobberthien, Anthony G. Tessier, Atiyah Yahya

Journal: NMR in Biomedicine

Glutamine (Gln), glutamate (Glu) and γ‐aminobutyric acid (GABA) are relevant brain metabolites that can be measured with magnetic resonance spectroscopy (MRS). This work optimizes the point‐resolved spectroscopy (PRESS) sequence echo times, TE1 and TE2, for improved simultaneous quantification of the three metabolites at 9.4 T. Quantification was based on the proton resonances of Gln, Glu and GABA at ≈2.45, ≈2.35 and ≈2.28 ppm, respectively. Glu...

Read More thumbnail image: Improved resolution of glutamate glutamine and aminobutyric acid with optimized pointresolved spectroscopy sequence timings for their simultaneous quantification at 9_4T

Is there evidence for more than two diffusion components in abdominal organs? – A magnetic resonance imaging study in healthy volunteers

Published: Nov 3, 2017

Author(s): Moritz C. Wurnig, Manon Germann, Andreas Boss

Journal: NMR in Biomedicine

The most commonly applied model for the description of diffusion‐weighted imaging (DWI) data in perfused organs is bicompartmental intravoxel incoherent motion (IVIM) analysis. In this study, we assessed the ground truth of underlying diffusion components in healthy abdominal organs using an extensive DWI protocol and subsequent computation of apparent diffusion coefficient ‘spectra’, similar to the computation of previously described T2...

Read More thumbnail image: Is there evidence for more than two diffusion components in abdominal organs  A magnetic resonance imaging study in healthy volunteers

Differentiating the histologic grades of gliomas preoperatively using amide proton transfer‐weighted (APTW) and intravoxel incoherent motion MRI

Published: Nov 3, 2017

Author(s): Tianyu Zou, Hao Yu, Chunxiu Jiang, Xianlong Wang, Shanshan Jiang, Qihong Rui, Yingjie Mei, Jinyuan Zhou, Zhibo Wen

Journal: NMR in Biomedicine

The purpose of this work was to investigate the diagnostic performance of amide proton transfer‐weighted (APTW) and intravoxel incoherent motion (IVIM) magnetic resonance imaging (MRI) in the preoperative grading of gliomas. Fifty‐one patients with suspected gliomas were recruited and underwent a preoperative MRI examination that included APTW and IVIM sequences. All cases were confirmed by postsurgical histopathology. APTW signal...

Read More thumbnail image: Differentiating the histologic grades of gliomas preoperatively using amide proton transferweighted APTW and intravoxel incoherent motion MRI

Toxicokinetics of strychnine and brucine after the oral administration of Biqi capsule to rats by RRLC–MS/MS

Published: Nov 3, 2017

Author(s): Hao Zheng, Zhe Wang, Wenwei Liu, Hongtao Jin, Jinlan Zhang

Journal: Biomedical Chromatography

Abstract Biqi capsule is a well‐known traditional Chinese medicine formula that has been widely applied for the clinical treatment of such diseases as rheumatoid arthritis, scapulohumeral periarthritis and cervical spondylopathy. However, there is concern regarding the toxicity of Biqi capsule owing to its active ingredients, strychnine and brucine. To investigate the toxicokinetics of strychnine and brucine after oral...

Read More thumbnail image: Toxicokinetics of strychnine and brucine after the oral administration of Biqi capsule to rats by RRLCMSMS
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