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https://www.readbyqxmd.com/read/28738655/risk-of-false-decision-on-conformity-of-a-multicomponent-material-when-test-results-of-the-components-content-are-correlated
#1
Ilya Kuselman, Francesca R Pennecchi, Ricardo J N B da Silva, D Brynn Hibbert
The probability of a false decision on conformity of a multicomponent material due to measurement uncertainty is discussed when test results are correlated. Specification limits of the components' content of such a material generate a multivariate specification interval/domain. When true values of components' content and corresponding test results are modelled by multivariate distributions (e.g. by multivariate normal distributions), a total global risk of a false decision on the material conformity can be evaluated based on calculation of integrals of their joint probability density function...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738647/development-of-an-analytical-methodology-for-obtaining-quantitative-mass-concentrations-from-laap-tof-ms-measurements
#2
Rachel Gemayel, Brice Temime-Roussel, Nathalie Hayeck, Adrien Gandolfo, Stig Hellebust, Sasho Gligorovski, Henri Wortham
Laser ablation aerosol particle-time of flight mass spectrometer (LAAP-ToF-MS) measures the size number of particles, and chemical composition of individual particles in real-time. LAAP-ToF-MS measurements of chemical composition are difficult to quantify, mostly because the instrument sensitivities to various chemical species in the multicomponent atmospheric aerosol particles are unknown. In this study, we investigate a field-based approach for quantitative measurements of ammonium, nitrate, sulfate, OC, and EC, in size-segregated atmospheric aerosols, by LAAP-ToF-MS using concurrent measurements from high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS), and multi-angle absorption photometer (MAAP)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738645/competitive-fluorescence-anisotropy-polarization-assay-for-atp-using-aptamer-as-affinity-ligand-and-dye-labeled-atp-as-fluorescence-tracer
#3
Yapiao Li, Linlin Sun, Qiang Zhao
We developed an aptamer-based competitive fluorescence anisotropy (FA)/fluorescence polarization (FP) assay for adenosine triphosphate (ATP). Different from the traditional fluorescence polarization immunoassays for small molecules, here DNA aptamer against ATP was used as affinity ligand, and tetramethylrhodamine (TMR) labeled ATP served as fluorescent tracer. The binding between TMR-labeled ATP and aptamer gave large FA due to molecular volume increase and restricted rotation of the dye-labeled ATP. When ATP was added in solution, ATP competitively displaced the TMR-labeled ATP from aptamer affinity complex, causing decrease of FA of TMR-labeled ATP...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738563/urinary-volatile-fingerprint-based-on-mass-spectrometry-for-the-discrimination-of-patients-with-lung-cancer-and-controls
#4
Álvaro García Ramos, Ana Pérez Antón, Miguel Del Nogal Sánchez, José Luis Pérez Pavón, Bernardo Moreno Cordero
Profile signals of urine samples corresponding to patients with lung cancer and controls were obtained using a non-separative methodology. The method is based on the coupling of a headspace sampler, a programed temperature vaporizer and a mass spectrometer (HS-PTV-MS). With only a centrifugation step as prior sample treatment, the samples were subjected to the headspace generation process and the volatiles generated were introduced into the PTV where they were trapped in the Tenax® packed liner while the solvent was purged...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738543/phenolic-compounds-of-triplaris-gardneriana-can-protect-cells-against-oxidative-stress-and-restore-oxidative-balance
#5
Thiago Silva de Almeida, José Joaquim Lopes Neto, Nathanna Mateus de Sousa, Igor Parra Pessoa, Leonardo Rogério Vieira, Jackeline Lima de Medeiros, Aline Augusti Boligon, Astrid R M Hamers, Davi Felipe Farias, Ad Peijnenburg, Ana Fontenele Urano Carvalho
This work aimed to add value to an underexploited plant species from Brazil, Triplaris gardneriana. To that, the phenolic compounds profile of its seed ethanolic extract and fractions was examined by HPLC and the antioxidant capacity assessed using chemical assays as well as in vitro cell imaging. Twelve compounds were quantified and classified as either phenolic acids or flavonoids. The fractionation process did not generate fractions with different compositions except for chloroformic fraction, which showed only 6 out of 12 standard compounds used...
July 20, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28738491/-establishment-of-a-model-of-hydrogen-peroxide-induced-injury-in-pulmonary-artery-endothelium-cells-and-relevant-mechanisms-of-oxidative-stress
#6
J Ye, Y Y He, Y Yan, J H Zhao, T Y Lian, X J Wang, Y Yan, S J Zhang, S H Yang, Z C Jing
Objective: To establish a hydrogen peroxide (H(2)O(2)) induced injury model of pulmonary artery endothelial cells (PAECs) and explore the molecular mechanisms of oxidative stress on the structure and function of PAECs in this model. Methods: Human PAECs were treated with H(2)O(2) at different concentrations (25, 50, 100, 200, 400, 800, 1 600, 3 200, 6 400 μmol/L) for 4 and 24 h, respectively. The PAECs survival curve was obtained according to the cell viability measured by CCK-8 assay. The cell apoptosis of PAECs was detected by flow cytometry...
July 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/28738243/both-facilitatory-and-inhibitory-impairments-underlie-age-related-differences-of-proactive-cognitive-control-across-the-adult-lifespan
#7
Pascal W M Van Gerven, Petra P M Hurks, Jos J Adam
We investigated two components of proactive cognitive control, response facilitation and response inhibition, in an adult lifespan sample (N=544, age range=18-91years) by administering two response-preparation tasks: a procue task, primarily involving facilitation, and an anticue task, involving both facilitation and inhibition. Cues in both tasks corresponded with the index and middle fingers of either the left or right hand. After a random preparation interval (PI) of 100-850ms following the onset of the cue signal, a single-target stimulus indicated the required response...
July 21, 2017: Acta Psychologica
https://www.readbyqxmd.com/read/28737990/cost-effectiveness-of-novel-agents-in-medicare-patients-with-multiple-myeloma-findings-from-a-u-s-payer-s-perspective
#8
Ying Chen, David R Lairson, Wenyaw Chan, Jinhai Huo, Xianglin L Du
BACKGROUND: Since multiple myeloma (MM) incurs a substantial economic burden in care management, more and more discussion has been generated in recent years about the costs of novel antimyeloma drugs and their associated value. Because of these costs, economic assessment that quantifies value of care over the long-term is essential. OBJECTIVE: To determine the cost-effectiveness (measured as cost per life-year saved) of front-line novel agent-based therapy use among a cohort of elderly patients with MM in a real-world setting...
August 2017: Journal of Managed Care & Specialty Pharmacy
https://www.readbyqxmd.com/read/28737921/investigation-of-mass-produced-substrates-for-reproducible-surface-enhanced-raman-scattering-measurements-over-large-areas
#9
Andreas Reyer, Adrian Prinz, Stefano Giancristofaro, Johannes Schneider, Durval Bertoldo Menezes, Gregor Zickler, Gilles R Bourret, Maurizio E Musso
Surface-enhanced Raman scattering (SERS) is a versatile spectroscopic technique that suffers from reproducibility issues and usually requires complex substrate fabrication processes. In this article, we report the use of a simple mass production technology based on Blu-ray disc manufacturing technology to prepare large area SERS substrates (∼40 mm(2)) with a high degree of homogeneity (±7% variation in Raman signal) and enhancement factor of ∼6 × 10(6). An industrial high throughput injection molding process was used to generate periodic microstructured polymer substrates coated with a thin Ag film...
July 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28737808/full-spectrum-volumetric-solar-thermal-conversion-via-photonic-nanofluids
#10
Xianglei Liu, Yimin Xuan
Volumetric solar thermal conversion is an emerging technique for a plethora of applications such as solar thermal power generation, desalination, and solar water splitting. However, achieving broadband solar thermal absorption via dilute nanofluids is still a daunting challenge. In this work, full-spectrum volumetric solar thermal conversion is demonstrated over a thin layer of the proposed 'photonic nanofluids'. The underlying mechanism is found to be the photonic superposition of core resonances, shell plasmons, and core-shell resonances at different wavelengths, whose coexistence is enabled by the broken symmetry of specially designed composite nanoparticles, i...
July 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28737782/ferrocene-cinchona-hybrids-with-triazolyl-chalcone-linkers-act-as-pro-oxidants-and-sensitize-human-cancer-cell-lines-to-paclitaxel
#11
Ana Podolski-Renić, Szilvia Bősze, Jelena Dinić, László Kocsis, Ferenc Hudecz, Antal Csámpai, Milica Pešić
Recently, we demonstrated that ferrocene-containing compounds with a cinchona moiety displayed marked anticancer activity. Here we report on the effects of the most promising isomers encompassing quinine- (compounds 4 and 5) and quinidine-epimers (compounds 6 and 7) - synthesized using improved methods providing controlled diastereoselectivity - in three different human multidrug resistant (MDR) cancer cell lines and their sensitive counterparts (non-small cell lung carcinoma NCI-H460/R/NCI-H460, colorectal carcinoma DLD1-TxR/DLD1 and glioblastoma U87-TxR/U87)...
July 24, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28737741/rapidly-inducible-cas9-and-dsb-ddpcr-to-probe-editing-kinetics
#12
John C Rose, Jason J Stephany, William J Valente, Bridget M Trevillian, Ha V Dang, Jason H Bielas, Dustin J Maly, Douglas M Fowler
We developed a chemically inducible Cas9 (ciCas9) and a droplet digital PCR assay for double-strand breaks (DSB-ddPCR) to investigate the kinetics of Cas9-mediated generation and repair of DSBs in cells. ciCas9 is a rapidly activated, single-component Cas9 variant engineered by replacing the protein's REC2 domain with the BCL-xL protein and fusing an interacting BH3 peptide to the C terminus. ciCas9 can be tunably activated by a compound that disrupts the BCL-xL-BH3 interaction within minutes. DSB-ddPCR demonstrates time-resolved, highly quantitative, and targeted measurement of DSBs...
July 24, 2017: Nature Methods
https://www.readbyqxmd.com/read/28737715/latency-integration-and-reactivation-of-human-herpesvirus-6
#13
REVIEW
Shara N Pantry, Peter G Medveczky
Human herpesvirus-6A (HHV-6A) and human herpesvirus-6B (HHV-6B) are two closely related viruses that infect T-cells. Both HHV-6A and HHV-6B possess telomere-like repeats at the terminal regions of their genomes that facilitate latency by integration into the host telomeres, rather than by episome formation. In about 1% of the human population, human herpes virus-6 (HHV-6) integration into germline cells allows the viral genome to be passed down from one generation to the other; this condition is called inherited chromosomally integrated HHV-6 (iciHHV-6)...
July 24, 2017: Viruses
https://www.readbyqxmd.com/read/28737621/baroreflex-activation-therapy-a-new-approach-to-the-management-of-advanced-heart-failure-with-reduced-ejection-fraction
#14
Edoardo Gronda, Darrel Francis, Faiez Zannad, Christian Hamm, Josep Brugada, Emilio Vanoli
: Chronic heart failure is a common clinical condition characterized by persistent excessive sympathetic nervous system activation. The derangement of the sympathetic activity has relevant implications for disease progression and patient survival. Aiming to positively impact patient outcome, autonomic nervous system modulatory therapies have been developed and tested in animal and clinical studies. As a general gross assumption, direct vagal stimulation and baroreflex activation are considered equivalent. This assumption does not take into account the fact that direct cervical vagal nerve stimulation involves activation of both afferent and efferent fibers innervating not only the heart, but the entire visceral system, leading to undesired responses to and from this compartment...
July 21, 2017: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/28737481/thermal-response-to-firefighting-activities-in-residential-structure-fires-impact-of-job-assignment-and-suppression-tactic
#15
Gavin P Horn, Richard M Kesler, Steve Kerber, Kenneth W Fent, Tad J Schroeder, William S Scott, Patricia C Fehling, Bo Fernhall, Denise L Smith
Firefighters' thermal burden is generally attributed to high heat loads from the fire and metabolic heat generation, which may vary between job assignments and suppression tactic employed. Utilizing a full-sized residential structure, firefighters were deployed in six job assignments utilizing two attack tactics (1. Water applied from the interior, or 2. Exterior water application before transitioning to the interior). Environmental temperatures decreased after water application, but more rapidly with transitional attack...
July 24, 2017: Ergonomics
https://www.readbyqxmd.com/read/28737432/integrin-targeted-nano-sized-polymeric-systems-for-paclitaxel-conjugation-a-comparative-study
#16
Anat Eldar-Boock, Rachel Blau, Claudia Ryppa, Hemda Baabur-Cohen, Ariel Many, María J Vicent, Felix Kratz, Joaquin Sanchis, Ronit Satchi-Fainaro
The generation of rationally-designed polymer therapeutics via the conjugation of low molecular weight anti-cancer drugs to water-soluble polymeric nanocarriers aims to improve the therapeutic index. Here, we focus on applying polymer therapeutics to target two cell compartments simultaneously - tumor cells and angiogenic endothelial cells. Comparing different polymeric backbones carrying the same therapeutic agent and targeting moiety may shed light on any correlation between the choice of polymer and the anti-cancer activity of the conjugate...
July 24, 2017: Journal of Drug Targeting
https://www.readbyqxmd.com/read/28737036/ph-change-in-electroosmotic-flow-hysteresis
#17
Chun Yee Lim, An Eng Lim, Yee Cheong Lam
Electroosmotic flow (EOF) has been shown to exhibit hysteresis effect under displacement flow involving two solutions with different con-centrations, i.e. the flow velocity for a high concentration solution displacing a low concentration solution is faster than the flow in the reverse direction involving the same solution pair. Based on our recent numerical analysis, pH change initiated at the interface between the two solutions has been hypothesized as the cause for the observed anomalies. We report the first experimental evidence on electroosmotic flow hysteresis induced by pH change in the bulk solution...
July 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28736910/longitudinal-mr-spectroscopy-shows-altered-metabolism-in-traumatic-brain-injury
#18
Andrew A Maudsley, Varan Govind, Gaurav Saigal, Stuart G Gold, Leo Harris, Sulaiman Sheriff
BACKGROUND AND PURPOSE: Brain trauma is known to result in heterogeneous patterns of tissue damage and altered neuronal and glial metabolism that evolve over time following injury; however, little is known on the longitudinal evolution of these changes. In this study, magnetic resonance spectroscopic imaging (MRSI) was used to map the distributions of altered metabolism in a single subject at five time points over a period of 28 months following injury. METHODS: Magnetic resonance imaging and volumetric MRSI data were acquired in a subject that had experienced a moderate traumatic brain injury (Glasgow Coma Scale 13) at five time points, from 7 weeks to 28 months after injury...
July 23, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28736704/visualization-of-photoacoustic-images-in-a-limited-view-measuring-system-using-eigenvalues-of-a-photoacoustic-transmission-matrix
#19
Hiroshi Abe, Tsuyoshi Shiina
Photoacoustic imaging is a unique imaging method that involves extracting information from points at different depths, an advantage of ultrasound imaging, while maintaining functional information, a key feature of conventional photo imaging. This makes it easy to add functional images to ultrasound images by adding a laser pulse source to the conventional ultrasound imaging device and detecting a photo-ultrasound signal via a conventional ultrasound probe. One challenge when using normal one-dimensional (1D) probes and generating photoacoustic images is the limited-view problem, in which artefacts are observed due to the positions of the ultrasound transducers...
December 2017: Photoacoustics
https://www.readbyqxmd.com/read/28736627/personalized-and-precision-medicine-integrating-genomics-into-treatment-decisions-in-gastrointestinal-malignancies
#20
REVIEW
Trang H Au, Kai Wang, David Stenehjem, Ignacio Garrido-Laguna
The advent of next generation sequencing (NGS) technologies has advanced our understanding of the intrinsic biology of different gastrointestinal (GI) tumor types. The use of novel, more efficient sequencing platforms has improved turnaround times of sequencing results. This is providing real time opportunities to put precision medicine to the test. A number of early phase clinical trials are testing targeted therapies in unique molecularly characterized subsets of patients (baskets). While basket studies are gaining momentum, treatment failures serve to remind us that shifting from a histology-driven to a histology-agnostic approach is unlikely to be a failure-free strategy for a number of tumor types as recently learnt from vemurafenib failure in BRAF mutated metastatic colorectal cancer (mCRC)...
June 2017: Journal of Gastrointestinal Oncology
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