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https://www.readbyqxmd.com/read/29785857/a-simulation-study-on-two-analytical-techniques-for-alternating-treatments-designs
#1
Rumen Manolov
Alternating treatments designs (ATDs) are single-case experimental designs entailing the rapid alternation of conditions, and the specific sequence of conditions is usually determined at random. The visual analysis of ATD data entails comparing the data paths formed by connecting the measurements from the same condition. Apart from visual analyses, there are at least two quantitative analytical options also comparing data paths. On option is a visual structured criterion (VSC) regarding the number of comparisons for which one conditions has to be superior to the other to consider that the difference is not only due to random fluctuations...
May 1, 2018: Behavior Modification
https://www.readbyqxmd.com/read/29784419/development-of-a-method-for-the-elemental-analysis-of-milk-powders-using-laser-ablation-inductively-coupled-plasma-mass-spectrometry-la-icp-ms-and-its-potential-use-in-geographic-sourcing
#2
Tricia Hoffman, Radojko Jaćimović, Lian Jie Bay, Julieta Griboff, Marta Jagodic, Magdalena Monferrán, Nives Ogrinc, Ivan Podkolzin, Daniel Wunderlin, Jose Almirall
Milk has been reported as one of the most adulterated foodstuffs in the developed and developing world. One way to detect adulteration is to determine whether the country of origin on the label could be the actual country of origin. Such profiling may be accomplished through the use of elemental analysis techniques, however this is a preliminary study and this goal is not yet met. In this study, a laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) method was developed for the analysis of solid milk powder and compared to k0 -instrumental neutron activation analysis (k0 -INAA) for a reference milk material (IAEA-153) as well as several milk samples from different countries...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29783145/electrochemical-biosensor-system-using-a-cmos-microelectrode-array-provides-high-spatially-and-temporally-resolved-images
#3
William Tedjo, Jasmine E Nejad, Rachel Feeny, Lang Yang, Charles S Henry, Stuart Tobet, Tom Chen
The ability to view biological events in real time has contributed significantly to research in the life sciences. While video capture of real time changes in anatomical relationships is important, it is equally important to visualize real time changes in the chemical communications that drive cell behaviors. This paper describes an electrochemical imaging system capable of capturing changes in chemical gradients in live tissue slices. The system consists of a CMOS microchip with 8192 configurable Pt surface electrodes, on-chip potentiostat, on-chip control logic, and a microfluidic device designed to interface with the CMOS chip to support ex vivo tissue experimentation...
April 10, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29782166/toxicokinetics-tissue-distribution-and-excretion-of-dufulin-racemate-and-its-r-s-enantiomers-in-rats
#4
Huaguo Chen, Xin Zhou, Baoan Song
Dufulin is a plant antiviral agent with a novel molecular structure and has been used widely to prevent and control tobacco and rice viral diseases. In this study, an UHPLC-MS/MS assay was developed for rapid determination of dufulin racemate (rac-DFL) and its R (S)-enantiomers in rat plasma, tissues, urine and feces. A MALDI-MSI method was further used to visual research on tissue distribution after oral administration of the three analytes. Toxicokinetic study showed that both (R)-enantiomers of dufulin ((R)-DFL) and (S)-enantiomers of dufulin ((S)-DFL) had a faster ability to reach Cmax than that of rac-DFL...
May 21, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29780585/capturing-commemoration-using-mobile-recordings-within-memory-research
#5
Carolyn Birdsall, Danielle Drozdzewski
This paper details the contribution of mobile devices to capturing commemoration in action. It investigates the incorporation of audio and sound recording devices, observation, and note-taking into a mobile (auto)ethnographic research methodology, to research a large-scale commemorative event in Amsterdam, the Netherlands. On May 4, 2016, the sounds of a Silent March-through the streets of Amsterdam to Dam Square-were recorded and complemented by video grabs of the march's participants and onlookers. We discuss how the mixed method enabled a multilevel analysis across visual, textual, and aural layers of the commemorative atmosphere...
May 2018: Mobile Media & Communication
https://www.readbyqxmd.com/read/29777147/prediction-of-moisture-content-for-congou-black-tea-withering-leaves-using-image-features-and-nonlinear-method
#6
Gaozhen Liang, Chunwang Dong, Bin Hu, Hongkai Zhu, Haibo Yuan, Yongwen Jiang, Guoshuang Hao
Withering is the first step in the processing of congou black tea. With respect to the deficiency of traditional water content detection methods, a machine vision based NDT (Non Destructive Testing) method was established to detect the moisture content of withered leaves. First, according to the time sequences using computer visual system collected visible light images of tea leaf surfaces, and color and texture characteristics are extracted through the spatial changes of colors. Then quantitative prediction models for moisture content detection of withered tea leaves was established through linear PLS (Partial Least Squares) and non-linear SVM (Support Vector Machine)...
May 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29775406/phrase-mining-of-textual-data-to-analyze-extracellular-matrix-protein-patterns-across-cardiovascular-disease
#7
David Alexandre Liem, Sanjana Murali, Dibakar Sigdel, Yu Shi, Xuan Wang, Jiaming Shen, Howard Choi, J Harry Caufield, Wei Wang, Peipei Ping, Jiawei Han
Extracellular matrix (ECM) proteins have been shown to play important roles regulating multiple biological processes in an array of organ systems, including the cardiovascular system. By using a novel bioinformatics text-mining tool, we studied six categories of cardiovascular disease (CVD), namely ischemic heart disease (IHD), cardiomyopathies (CM), cerebrovascular accident (CVA), congenital heart disease (CHD), arrhythmias (ARR), and valve disease (VD), anticipating novel ECM protein-disease and protein-protein relationships hidden within vast quantities of textual data...
May 18, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29774391/comparison-of-left-ventricular-hypertrophy-by-electrocardiography-and-echocardiography-in-children-using-analytics-tool
#8
Lauren Tague, Justin Wiggs, Qianxi Li, Robert McCarter, Elizabeth Sherwin, Jacqueline Weinberg, Craig Sable
Left ventricular hypertrophy (LVH) is a common finding on pediatric electrocardiography (ECG) leading to many referrals for echocardiography (echo). This study utilizes a novel analytics tool that combines ECG and echo databases to evaluate ECG as a screening tool for LVH. SQL Server 2012 data warehouse incorporated ECG and echo databases for all patients from a single institution from 2006 to 2016. Customized queries identified patients 0-18 years old with LVH on ECG and an echo performed within 24 h. Using data visualization (Tableau) and analytic (Stata 14) software, ECG and echo findings were compared...
May 17, 2018: Pediatric Cardiology
https://www.readbyqxmd.com/read/29773185/kinetics-and-tissue-distribution-of-bismuth-tin-and-lead-after-implantation-of-miniature-shotgun-alloy-pellets-in-rats
#9
Vidar Skaug, Einar Eilertsen, Asbjørn Skogstad, Finn E S Levy, Balázs Berlinger, Yngvar Thomassen, Dag G Ellingsen
INTRODUCTION: Shotgun pellets containing bismuth (Bi) as substitute for lead (Pb) are increasingly being used due to environmental concerns. Information on toxicokinetics of Bi is lacking for the assessment of humans accidentally shot by Bi-containing shotgun alloy pellets. METHODS: Male Wistar rats were exposed to miniature alloy pellets containing Bi, tin (Sn) and minor amounts of Pb by implantation in muscle tissues of the hind legs. RESULTS: The concentrations of Bi in whole blood and urine increased up to 53 weeks after implantation...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29772778/visual-and-colorimetric-sensing-of-metsulfuron-methyl-by-exploiting-hydrogen-bond-induced-anti-aggregation-of-gold-nanoparticles-in-the-presence-of-melamine
#10
Guangyang Liu, Ruonan Zhang, Xiaodong Huang, Lingyun Li, Naixin Liu, Jing Wang, Donghui Xu
Various highly sensitive and selective analytical methods have been used to monitor metsulfuron-methyl residue in the environment. However, these methods involve costly instruments and complex, time-consuming operations performed in laboratories. Here, a rapid, convenient, and sensitive colorimetric sensor based on anti-aggregation of gold nanoparticles (AuNPs) is demonstrated for the rapid detection of metsulfuron-methyl in agricultural irrigation water. The AuNPs could be induced to aggregate in the presence of melamine and exhibited a distinct color change from wine-red to blue...
May 17, 2018: Sensors
https://www.readbyqxmd.com/read/29772485/neurocognitive-dysfunction-in-subjects-at-clinical-high-risk-for-psychosis-a-meta-analysis
#11
Wei Zheng, Qing-E Zhang, Dong-Bin Cai, Chee H Ng, Gabor S Ungvari, Yu-Ping Ning, Yu-Tao Xiang
Findings of neurocognitive dysfunction in subjects at Clinical High Risk for Psychosis (CHR-P) have been controversial. This meta-analysis systematically examined studies of neurocognitive functions using the MATRICS Consensus Cognitive Battery (MCCB) in CHR-P. An independent literature search of both English and Chinese databases was conducted by two reviewers. Standardized mean difference (SMD) was calculated using a random effects model to evaluate the effect size of the meta-analytic results. Six case-control studies (n = 396) comparing neurocognitive functions between CHR-P subjects (n = 197) and healthy controls (n = 199) using the MCCB were identified; 4 (66...
May 5, 2018: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/29770838/metal-oxide-nanoparticles-for-latent-fingerprint-visualization-and-analysis-of-small-drug-molecules-using-surface-assisted-laser-desorption-ionization-mass-spectrometry
#12
Mohamed O Amin, Metwally Madkour, Entesar Al-Hetlani
We explored the applicability of different metal oxide nanoparticles (NPs; ZnO, TiO2 , Fe2 O3 , and CeO2 ) for the optical imaging and mass spectrometric determination of small drug molecules in latent fingerprints (LFPs). Optical imaging was achieved using a dry method-simply dusting the LFPs with a minute amount of NP powder-and still images were captured using a digital microscope and a smartphone camera. Mass spectrometric determination was performed using the NPs as substrates for surface-assisted laser desorption ionization/mass spectrometry (SALDI-MS), which enabled the detection of small drug molecules with high signal intensities...
May 17, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29770776/in-situ-transmission-electron-microscopy-of-transistor-operation-and-failure
#13
Baoming Wang, M Zahabul Islam, M Aman Haque, Kelson Chabak, Michael Snure, Eric Heller, Nicholas Robert Glavin
Microscopy is typically used as a post-mortem analytical tool in performance and reliability studies on nanoscale materials and devices. In this study, we demonstrate real-time microscopy of operation and failure of AlGaN/GaN high electron mobility transistors inside the transmission electron microscope (TEM). Loading till failure was performed on the electron transparent transistors to visualize the failure mechanisms caused by self heating. At lower drain voltages, thermo-mechanical stresses induce irreversible microstructural deformation, mostly along the AlGaN/GaN interface, to initiate the damage process...
May 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29764369/vareporter-variant-reporter-for-cancer-research-of-massive-parallel-sequencing
#14
Po-Jung Huang, Chi-Ching Lee, Ling-Ya Chiu, Kuo-Yang Huang, Yuan-Ming Yeh, Chia-Yu Yang, Cheng-Hsun Chiu, Petrus Tang
BACKGROUND: High throughput sequencing technologies have been an increasingly critical aspect of precision medicine owing to a better identification of disease targets, which contributes to improved health care cost and clinical outcomes. In particular, disease-oriented targeted enrichment sequencing is becoming a widely-accepted application for diagnostic purposes, which can interrogate known diagnostic variants as well as identify novel biomarkers from panels of entire human coding exome or disease-associated genes...
May 9, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29762016/rapid-2-ms-interrogation-of-electrochemical-aptamer-based-sensor-response-using-intermittent-pulse-amperometry
#15
Mirelis Santos-Cancel, Robert Alexander Lazenby, Ryan J White
In this manuscript, we employ the technique intermittent pulse amperometry (IPA) to interrogate equilibrium and kinetic target binding to the surface of electrochemical, aptamer-based (E-AB) sensors, achieving as fast as 2 ms time resolution. E-AB sensors comprise an electrode surface modified with a flexible nucleic acid aptamer tethered at the 3'-terminus with a redox-active molecule. The introduction of a target changes the conformation and flexibility of the nucleic acid which alters the charge transfer rate of the appended redox molecule...
May 15, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29761206/imaging-of-oxygen-and-hypoxia-in-cell-and-tissue-samples
#16
REVIEW
Dmitri B Papkovsky, Ruslan I Dmitriev
Molecular oxygen (O2 ) is a key player in cell mitochondrial function, redox balance and oxidative stress, normal tissue function and many common disease states. Various chemical, physical and biological methods have been proposed for measurement, real-time monitoring and imaging of O2 concentration, state of decreased O2 (hypoxia) and related parameters in cells and tissue. Here, we review the established and emerging optical microscopy techniques allowing to visualize O2 levels in cells and tissue samples, mostly under in vitro and ex vivo, but also under in vivo settings...
May 14, 2018: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29758469/a-facile-and-selective-approach-to-the-qualitative-and-quantitative-analysis-of-triterpenoids-and-phenylpropanoids-by-uplc-q-tof-ms-ms-for-the-quality-control-of-ilex-rotunda
#17
Bao Yang, Hui Li, Qing-Feng Ruan, Yuan-Yuan Xue, Di Cao, Xing-Hong Zhou, Shi-Qin Jiang, Tao Yi, Jing Jin, Zhong-Xiang Zhao
Ilex rotunda, in which triterpenoids and phenylpropanoids are major bioactive constituents, has been widely used in traditional Chinese medicines. In this study, a validated UPLC/Q-TOF-MS/MS method was developed to simultaneously identify and quantify the triterpenoids and phenylpropanoids in the stem bark, fruit, leaves, roots and stem xylem of this herbal medicine. A total of seventy triterpenoids and twelve phenylpropanoids were identified with the assistance of the modified mass defect filter and key product ion filter data processing strategies, and forty-eight of them were confirmed by reference substances...
May 3, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29757615/hyperspectral-stimulated-raman-scattering-microscopy-unravels-aberrant-accumulation-of-saturated-fat-in-human-liver-cancer
#18
Shuai Yan, Sishan Cui, Kun Ke, Bixing Zhao, Xiaolong Liu, Shuhua Yue, Ping Wang
Lipid metabolism is dysregulated in human cancers. The analytical tools that could identify and quantitatively map metabolites in unprocessed human tissues with sub-micron resolution are highly desired. Here, we implemented analytical hyperspectral stimulated Raman scattering microscopy to map the lipid metabolites in situ in normal and cancerous liver tissues from 24 patients. In contrast to the conventional wisdom that unsaturated lipid accumulation en-hances tumor cell survival and proliferation, we unexpectedly visual-ized substantial amount of saturated fat accumulated in cancerous liver tissues, which was not seen in majority of their adjacent normal tissues...
May 14, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29755202/modeling-temporal-interaction-dynamics-in-organizational-settings
#19
Nale Lehmann-Willenbrock, Joseph A Allen
Most workplace phenomena take place in dynamic social settings and emerge over time, and scholars have repeatedly called for more research into the temporal dynamics of organizational behavior. One reason for this persistent research gap could be that organizational scholars are not aware of the methodological advances that are available today for modeling temporal interactions and detecting behavioral patterns that emerge over time. To facilitate such awareness, this Methods Corner contribution provides a hands-on tutorial for capturing and quantifying temporal behavioral patterns and for leveraging rich interaction data in organizational settings...
2018: Journal of Business and Psychology
https://www.readbyqxmd.com/read/29754612/development-of-extremely-stable-dual-functionalized-gold-nanoparticles-for-effective-colorimetric-detection-of-clenbuterol-and-ractopamine-in-human-urine-samples
#20
Turibius Simon, Muthaiah Shellaiah, Perpectual Steffi, Kien Wen Sun, Fu-Hsiang Ko
New glutamic acid (Glu) and polyethylenimine (PE) functionalized ultra-stable gold nanoparticles (PE-Glu-AuNPs) were developed via a simple NaBH4 reduction method. The low toxicity and biocompatibility of PE-Glu-AuNPs were confirmed via an MTT assay in Raw 264.7 cells. Excitingly, PE-Glu-AuNPs were found to be extremely stable at room temperature up to six months and were utilized in an effective colorimetric naked eye assay of clenbuterol (CLB) and ractopamine (RCT) at pH 5. It was found that the selective assay of CLB and RCT is not affected by any other interferences (such as alanine, phenylalanine, NaCl, CaCl2 , threonine, cysteine, glycine, glucose, urea and salbutamol)...
September 6, 2018: Analytica Chimica Acta
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