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Analytical Techniques

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https://www.readbyqxmd.com/read/27925735/continuous-time-discrete-distribution-theory-for-activity-driven-networks
#1
Lorenzo Zino, Alessandro Rizzo, Maurizio Porfiri
Activity-driven networks are a powerful paradigm to study epidemic spreading over time-varying networks. Despite significant advances, most of the current understanding relies on discrete-time computer simulations, in which each node is assigned an activity potential from a continuous distribution. Here, we establish a continuous-time discrete-distribution framework toward an analytical treatment of the epidemic spreading, from its onset to the endemic equilibrium. In the thermodynamic limit, we derive a nonlinear dynamical system to accurately model the epidemic spreading and leverage techniques from the fields of differential inclusions and adaptive estimation to inform short- and long-term predictions...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27924486/surface-plasmon-resonance-a-useful-strategy-for-the-identification-of-small-molecule-argonaute-2-protein-binders
#2
Elena Poser, Ilaria Genovese, Silvia Masciarelli, Teresa Bellissimo, Francesco Fazi, Gianni Colotti
Surface plasmon resonance (SPR) is one of the most important techniques for the detection and the characterization of molecular interactions. SPR technology is a label-free approach for monitoring biomolecular interactions in real time. The binding of analytes to molecules immobilized on a thin metal film (ligand) determines a change in the refractive index and, therefore in the angle of extinction of light, is reflected when polarized light hits the film, monitored in real time as a change in the position of the dip in reflected intensity...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27924281/causality-analysis-detects-the-regulatory-role-of-maternal-effect-genes-in-the-early-drosophila-embryo
#3
Zara Ghodsi, Xu Huang, Hossein Hassani
In developmental studies, inferring regulatory interactions of segmentation genetic network play a vital role in unveiling the mechanism of pattern formation. As such, there exists an opportune demand for theoretical developments and new mathematical models which can result in a more accurate illustration of this genetic network. Accordingly, this paper seeks to extract the meaningful regulatory role of the maternal effect genes using a variety of causality detection techniques and to explore whether these methods can suggest a new analytical view to the gene regulatory networks...
March 2017: Genomics Data
https://www.readbyqxmd.com/read/27924041/exposome-explorer-a-manually-curated-database-on-biomarkers-of-exposure-to-dietary-and-environmental-factors
#4
Vanessa Neveu, Alice Moussy, Héloïse Rouaix, Roland Wedekind, Allison Pon, Craig Knox, David S Wishart, Augustin Scalbert
Exposome-Explorer (http://exposome-explorer.iarc.fr) is the first database dedicated to biomarkers of exposure to environmental risk factors. It contains detailed information on the nature of biomarkers, their concentrations in various human biospecimens, the study population where measured and the analytical techniques used for measurement. It also contains correlations with external exposure measurements and data on biological reproducibility over time. The data in Exposome-Explorer was manually collected from peer-reviewed publications and organized to make it easily accessible through a web interface for in-depth analyses...
October 24, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27922462/fostering-evidence-based-quality-improvement-for-patient-centered-medical-homes-initiating-local-quality-councils-to-transform-primary-care
#5
Susan E Stockdale, Jessica Zuchowski, Lisa V Rubenstein, Negar Sapir, Elizabeth M Yano, Lisa Altman, Jacqueline J Fickel, Skye McDougall, Timothy Dresselhaus, Alison B Hamilton
BACKGROUND: Although the patient-centered medical home endorses quality improvement principles, methods for supporting ongoing, systematic primary care quality improvement have not been evaluated. We introduced primary care quality councils at six Veterans Health Administration sites as an organizational intervention with three key design elements: (a) fostering interdisciplinary quality improvement leadership, (b) establishing a structured quality improvement process, and (c) facilitating organizationally aligned frontline quality improvement innovation...
December 3, 2016: Health Care Management Review
https://www.readbyqxmd.com/read/27921456/capillary-electrophoresis-mass-spectrometry-as-a-tool-for-untargeted-metabolomics
#6
Antonia García, Joanna Godzien, Ángeles López-Gonzálvez, Coral Barbas
Highly polar and ionic metabolites, such as sugars, most amino acids, organic acids or nucleotides are not retained by conventional reversed-phase LC columns and polar stationary phases and hydrophilic-interaction LC lacks of robustness, which is still limiting their applications for untargeted metabolomics where reproducibility is a must. Biological samples such as blood, urine or even tissues include many hydrophilic compounds secreted from cells, their analysis is essential for biomarker discovery, disease progression or treatment effects...
January 2017: Bioanalysis
https://www.readbyqxmd.com/read/27918664/modern-techniques-and-technologies-applied-to-training-and-performance-monitoring
#7
William A Sands, Ashley A Kavanaugh, Steven R Murray, Jeni R McNeal, Monèm Jemni
Athlete preparation and performance continues to increase in complexity and costs. Modern coaches are shifting from reliance on personal memory, experience, and opinion to evidence from collected training load data. Training load monitoring may hold vital information for developing systems of monitoring that follow the training process with such precision that both performance prediction and day-to-day management of training become an adjunct to preparation and performance. Time series data collection and analyses in sport are still in their infancy with considerable efforts being applied in "big-data" analytics and models of the appropriate variables to monitor and methods for doing so...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27917160/development-of-multiple-cross-displacement-amplification-label-based-gold-nanoparticles-lateral-flow-biosensor-for-detection-of-shigella-spp
#8
Yi Wang, Yan Wang, Jianguo Xu, Changyun Ye
Shigella spp., the etiological agent of shigellosis or "bacillary dysentery," are responsible for considerable morbidity and mortality in excess of a million deaths globally per year. Although PCR-based techniques (such as PCR-based dipstick biosensors) have been used for the molecular diagnosis of infectious disease, these assays were restricted due to the need for a sophisticated thermal cycling apparatus to denature target templates. To facilitate simple and rapid detection of target pathogens, we successfully devised an inexpensive, reliable and nearly instrument-free molecular technique, which incorporates multiple cross displacement amplification (MCDA) combined with a newly designed lateral flow biosensor (LFB) for visual, sensitive and specific detection of Shigella...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27916135/integrating-chemical-imaging-of-cationic-trace-metal-solutes-and-ph-into-a-single-hydrogel-layer
#9
Christoph Hoefer, Jakob Santner, Sergey M Borisov, Walter W Wenzel, Markus Puschenreiter
Gel-based, two-dimensional (2D) chemical imaging techniques are versatile methods for investigating biogeochemically active environments at high spatial resolution (sub-mm). State-of-the-art solute imaging techniques, such as diffusive gradients in thin films (DGT) and planar optodes (PO), employ passive solute sampling or sensing. Combining these methods will provide powerful tools for studying the biogeochemistry of biological niches in soils and sediments. In this study we aimed at developing a combined single-layer gel for direct pH imaging using PO and sampling of anionic and cationic solutes by DGT, with subsequent analysis of the bound solutes by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS)...
January 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27916127/in-situ-determination-of-v-v-by-diffusive-gradients-in-thin-films-and-inductively-coupled-plasma-mass-spectrometry-techniques-using-amberlite-ira-410-resin-as-a-binding-layer
#10
Karen Silva Luko, Amauri Antonio Menegário, Carlos Alfredo Suárez, Makenly Tafurt-Cardona, Jorge Henrique Pedrobom, Ana Marta Cavinato Marchini Rolisola, Everton Tiago Sulato, Chang Hung Kiang
Amberlite IRA-410 anionic exchange resin was evaluated as the binding layer for sampling V(V) by using Diffusive Gradients in Thin Films (DGT). V(V) was determined by inductively coupled plasma mass spectrometry (ICP-MS). Mass vs. time DGT deployments (ionic strength = 0.03 mol L(-1) NaNO3, pH = 5.6 and T = 23.5 ± 0.5 °C) was characterized by excellent linear relationship (R(2) = 0.9993) and a significant retention of V(V) by the binding layer. An exchange capacity of at least 40 μg V g(-1) resin was achieved for the proposed binding layer...
January 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27916114/competitive-inhibition-assay-for-the-detection-of-progesterone-in-dairy-milk-using-a-fiber-optic-spr-biosensor
#11
D Daems, J Lu, F Delport, N Mariën, L Orbie, B Aernouts, I Adriaens, T Huybrechts, W Saeys, D Spasic, J Lammertyn
Analytical methods that are often used for the quantification of progesterone in bovine milk include immunoassays and chromatographic techniques. Depending on the selected method, the main disadvantages are the cost, time-to-result, labor intensity and usability as an automated at-line device. This paper reports for the first time on a robust and practical method to quantify small molecules, such as progesterone, in complex biological samples using an automated fiber optic surface plasmon resonance (FO-SPR) biosensor...
January 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27915431/time-dependent-postmortem-redistribution-of-morphine-and-its-metabolites-in-blood-and-alternative-matrices-application-of-ct-guided-biopsy-sampling
#12
Sandra N Staeheli, Dominic Gascho, Lars C Ebert, Thomas Kraemer, Andrea E Steuer
Interpretation of postmortem morphine concentrations in forensic toxicology provides several pitfalls such as missing information on tolerance, analyte stability, or postmortem redistribution (PMR). Recently, it had been shown that computed tomography (CT)-guided collection of biopsies using a robotic arm (virtobot) provides a valuable strategy for systematic studies on time-dependent PMR. Using this technique, time-dependent PMR of morphine and its metabolites was investigated in 12 cases. At admission to the institute (t1), femoral and heart blood (right ventricle) as well as biopsies from the right lung, the right kidney, liver, spleen, and muscle tissue were collected...
December 3, 2016: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/27915188/combined-cluster-and-discriminant-analysis-an-efficient-chemometric-approach-in-diesel-fuel-characterization
#13
Márton Novák, Dóra Palya, Zsolt Bodai, Zoltán Nyiri, Norbert Magyar, József Kovács, Zsuzsanna Eke
Combined cluster and discriminant analysis (CCDA) as a chemometric tool in compound specific isotope analysis of diesel fuels was studied. The stable carbon isotope ratios (δ(13)C) of n-alkanes in diesel fuel can be used to characterize or differentiate diesels originating from different sources. We investigated 25 diesel fuel samples representing 20 different brands. The samples were collected from 25 different service stations in 11 European countries over a 2 year period. The n-alkane fraction of diesel fuels was separated using solid-state urea clathrate formation combined with silica gel fractionation...
November 23, 2016: Forensic Science International
https://www.readbyqxmd.com/read/27915157/double-injection-single-detection-asymmetric-flow-injection-manifold-for-spectrophotometric-determination-of-ascorbic-acid-and-uric-acid-selection-the-optimal-conditions-by-mcdm-approach-based-on-different-criteria-weighting-methods
#14
Samira Boroumand, Mansour Arab Chamjangali, Ghadamali Bagherian
A simple and sensitive double injection/single detector flow injection analysis (FIA) method is proposed for the simultaneous kinetic determination of ascorbic acid (AA) and uric acid (UA). This method is based upon the difference between the rates of the AA and UA reactions with Fe(3+) in the presence of 1, 10-phenanthroline (phen). The absorbance of Fe(2+)/1, 10-phenanthroline (Fe-phen) complex obtained as the product was measured spectrophotometrically at 510nm. To reach a good accuracy in the differential kinetic determination via the mathematical manipulations of the transient signals, different criteria were considered in the selection of the optimum conditions...
November 20, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/27914607/ultra-high-performance-size-exclusion-chromatography-in-polar-solvents
#15
Gertjan Vancoillie, Maarten Vergaelen, Richard Hoogenboom
Size-exclusion chromatography (SEC) is amongst the most widely used polymer characterization methods in both academic and industrial polymer research allowing the determination of molecular weight and distribution parameters, i.e. the dispersity (Ɖ), of unknown polymers. The many advantages, including accuracy, reproducibility and low sample consumption, have contributed to the worldwide success of this analytical technique. The current generation of SEC systems have a stationary phase mostly containing highly porous, styrene-divinylbenzene particles allowing for a size-based separation of various polymers in solution but limiting the flow rate and solvent compatibility...
November 21, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27914448/a-fractional-calculus-model-of-anomalous-dispersion-of-acoustic-waves
#16
Andrew W Wharmby
An empirical formula based on viscoelastic analysis techniques that employs concepts from the fractional calculus that was used to model the dielectric behavior of materials exposed to oscillating electromagnetic fields in the radiofrequency, terahertz, and infrared bands. This work adapts and applies the formula to model viscoelastic behavior of materials that show an apparent increase of phase velocity of vibration with an increase in frequency, otherwise known as anomalous dispersion. A fractional order wave equation is derived through the application of the classic elastic-viscoelastic correspondence principle whose analytical solution is used to describe absorption and dispersion of acoustic waves in the viscoelastic material displaying anomalous dispersion in a specific frequency range...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27914438/dynamic-sound-scattering-field-fluctuation-spectroscopy-with-singly-scattered-ultrasound-in-the-near-and-far-fields
#17
M L Cowan, J H Page, T Norisuye, D A Weitz
Dynamic sound scattering (DSS) is a powerful acoustic technique for investigating the motion of particles or other inclusions inside an evolving medium. In DSS, this dynamic information is obtained by measuring the field autocorrelation function of the temporal fluctuations of singly scattered acoustic waves. The technique was initially introduced 15 years ago, but its technical aspects were not adequately discussed then. This paper addresses the need for a more complete account of the method by describing in detail two different implementations of this sound scattering technique, one of which is specifically adapted to a common experimental situation in ultrasonics...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27914431/complex-modes-expansion-with-vector-projection-using-power-flow-to-simulate-lamb-waves-scattering-from-horizontal-cracks-and-disbonds
#18
Banibrata Poddar, Victor Giurgiutiu
This paper presents an inexpensive but accurate analytical method to calculate the scattering of straight-crested Lamb waves from cracks parallel to the plate surface. The same method is applicable for the disbond problem. In this method, the scatter field is expanded in terms of complex Lamb wave modes with unknown amplitudes. These unknown amplitudes are obtained from the boundary conditions using vector projection utilizing the power expression. The process works by projecting the stress conditions onto the displacement eigen-spaces of complex Lamb wave modes and vice versa...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27914280/trace-isotope-analysis-of-ricinus-communis-seed-core-for-provenance-determination-by-laser-ablation-icp-ms
#19
Christina K Bagas, Rachel L Scadding, Cameron J Scadding, R John Watling, Warren Roberts, Simon P B Ovenden
The castor bean plant, Ricinus communis, grows wild throughout many regions of Australia. The seeds of the plant contain the schedule 1 chemical agent ricin, a type II ribosomal inhibiting protein. Currently there are limited analytical techniques that can be applied in analysis of the seeds to establish attribution. In this study, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was used for the analysis of seeds collected from 68 plants across 38 locations around Australia. Of the 92 elemental isotopes measured, fifteen ((24)Mg, (27)Al, (44)Ca, (53)Cr, (55)Mn, (57)Fe, (60)Ni, (65)Cu, (66)Zn, (75)As, (85)Rb, (88)Sr, (98)Mo, (138)Ba and (202)Hg) yielded data that were relevant to all collection sites...
November 25, 2016: Forensic Science International
https://www.readbyqxmd.com/read/27914209/methodological-flaws-introduce-strong-bias-into-molecular-analysis-of-microbial-populations
#20
Niclas Krakat, Reshma Anjum, Burak Demirel, Patrick Schröder
AIMS: Here we report how different cell disruption methods, PCR primers and in-silico analyses can seriously bias results from microbial population studies, with consequences for the credibility and reproducibility of the findings. Our results emphasize the pitfalls of commonly used experimental methods that can seriously weaken the interpretation of results. METHODS AND RESULTS: Four different cell lysis methods, three commonly used primer pairs and various computer-based analyses were applied to investigate the microbial diversity of a fermentation sample composed of chicken dung...
December 3, 2016: Journal of Applied Microbiology
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