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https://www.readbyqxmd.com/read/28719816/sulfate-radical-induced-degradation-of-%C3%AE-2-adrenoceptor-agonists-salbutamol-and-terbutaline-phenoxyl-radical-dependent-mechanisms
#1
Lei Zhou, Mohamad Sleiman, Corinne Ferronato, Jean-Marc Chovelon, Pascal de Sainte-Claire, Claire Richard
The present study investigated the reactivity and oxidation mechanisms of salbutamol (SAL) and terbutaline (TBL), two typical β2-adrenoceptor agonists, towards sulfate radical (SO4(-)) by using photo-activated persulfate (PS). The reaction pathways and mechanisms were proposed based on products identification using high resolution HPLC-ESI-MS, laser flash photolysis (LFP) and molecular orbital calculations. The results indicated that SO4(-) was the dominant reactive species in the UV/PS process. The second-order rate constants of sulfate radical reaction with SAL and TBL were measured as (3...
July 14, 2017: Water Research
https://www.readbyqxmd.com/read/28719744/high-resolution-insights-into-the-stepwise-self-assembly-of-nanofiber-from-bioactive-peptides
#2
Fude Sun, Long Chen, Xiufang Ding, Lida Xu, Xirui Zhou, Peng Wei, Jun-Feng Liang, Shi-Zhong Luo
Peptide self-assembly has a profound biological significance since self-assembled bioactive peptides are gifted with improved bioactivity as well as life-span. In this study, peptide self-assembly was investigated using a therapeutic peptide, PTP-7S (EENFLGALFKALSKLL). Combining experiments of atomic force microscopy (AFM), circular dichroism (CD) and 8-anilino-1-naphthalenesulfonic acid (ANS) fluorescence spectra, PTP-7S showing α-helix was found self-assembling into nanofibers in solution. Relying on the coarse-grained (CG) dynamic simulations, the self-assembling of PTP-7S was revealed as a stepwise process that peptide monomers first clustered into peptide-assembling units (PUs) with charged surface, and then the PUs integrated together to construct nano-fibril aggregates...
July 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28719219/microsecond-structural-rheology
#3
Felix Lehmkühler, Ingo Steinke, Martin A Schroer, Birgit Fischer, Michael Sprung, Gerhard Grübel
The relationship between the local structure of complex liquids and their response to shear is generally not well understood. This concerns in particular the formation of particle strings in flow direction or hydroclusters, both important for the understanding of shear thinning and thickening phenomena. Here, we present results of a microfocus X-ray scattering experiment on spherical silica colloids in a liquid jet at high shear rates. Along and across the jet we observe direction-dependent modifications of the structure factor of the suspension suggesting the formation of differently ordered clusters in stream and compression lines...
July 18, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28719153/in-source-collision-induced-dissociation-is-cid-applications-issues-and-structure-elucidation-with-single-stage-mass-analyzers
#4
Jon F Parcher, Mei Wang, Amar G Chittiboyina, Ikhlas A Khan
A discussion of the definition, advantages and issues with the formation of ions in the transition region between an ESI source and the ion optics of a mass analyzer is presented. The various types of ions formed in the so-called in-source collision induced dissociation (IS-CID) process are illustrated. Applications of IS-CID with single-stage mass analyzers, such as structure elucidation and quantitation, are demonstrated. The discussion is illustrated by examples of the in-source fragmentation of ginkgolides, which are marker compounds found only in Ginkgo biloba...
July 18, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28719082/determination-of-seven-drugs-of-abuse-and-their-metabolites-in-surface-and-waste-water-using-solid-phase-extraction-coupled-to-liquid-chromatography-with-high-resolution-mass-spectrometry
#5
Helena Prosen, Núria Fontanals, Francesc Borrull, Rosa Maria Marcé
A method based on liquid chromatography with electrospray ionization high-resolution mass spectrometry (Exactive Orbitrap) combined with solid-phase extraction using a strong cationic exchange mixed-mode sorbent has been developed for the determination of seven drugs of abuse, including two synthetic cathinones, as well as some of their metabolites in environmental water samples. The method provides low detection limits and a high confirmation power thanks to the diagnostic and two fragment ions monitored for each compound in high-resolution mass spectrometry, providing six identification points for each analyte...
July 18, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28719019/initial-testing-of-a-pixelated-silicon-detector-prototype-in-proton-therapy
#6
Andrew J Wroe, Grant McAuley, Anthony V Teran, Jeannie Wong, Marco Petasecca, Michael Lerch, James M Slater, Anatoly B Rozenfeld
As technology continues to develop, external beam radiation therapy is being employed, with increased conformity, to treat smaller targets. As this occurs, the dosimetry methods and tools employed to quantify these fields for treatment also have to evolve to provide increased spatial resolution. The team at the University of Wollongong has developed a pixelated silicon detector prototype known as the dose magnifying glass (DMG) for real-time small-field metrology. This device has been tested in photon fields and IMRT...
July 18, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28718790/preliminary-study-of-uas-equipped-with-thermal-camera-for-volcanic-geothermal-monitoring-in-taiwan
#7
Shih-Hong Chio, Cheng-Horng Lin
Thermal infrared cameras sense the temperature information of sensed scenes. With the development of UASs (Unmanned Aircraft Systems), thermal infrared cameras can now be carried on a quadcopter UAV (Unmanned Aircraft Vehicle) to appropriately collect high-resolution thermal images for volcanic geothermal monitoring in a local area. Therefore, the quadcopter UAS used to acquire thermal images for volcanic geothermal monitoring has been developed in Taiwan as part of this study to overcome the difficult terrain with highly variable topography and extreme environmental conditions...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718400/histone-h3g34r-mutation-causes-replication-stress-homologous-recombination-defects-and-genomic-instability-in-s-pombe
#8
Rajesh K Yadav, Carolyn M Jablonowski, Alfonso G Fernandez, Brandon R Lowe, Ryan A Henry, David Finkelstein, Kevin J Barnum, Alison L Pidoux, Yin-Ming Kuo, Jie Huang, Matthew J O'Connell, Andrew J Andrews, Arzu Onar-Thomas, Robin C Allshire, Janet F Partridge
Recurrent somatic mutations of H3F3A in aggressive pediatric high-grade gliomas generate K27M or G34R/V mutant histone H3.3. H3.3-G34R/V mutants are common in tumors with mutations in p53 and ATRX, an H3.3-specific chromatin remodeler. To gain insight into the role of H3-G34R, we generated fission yeast that express only the mutant histone H3. H3-G34R specifically reduces H3K36 tri-methylation and H3K36 acetylation, and mutants show partial transcriptional overlap with set2 deletions. H3-G34R mutants exhibit genomic instability and increased replication stress, including slowed replication fork restart, although DNA replication checkpoints are functional...
July 18, 2017: ELife
https://www.readbyqxmd.com/read/28718202/patterns-of-mortality-in-a-montane-mixed-conifer-forest-in-san-diego-county-california
#9
Mary Pyott Freeman, Douglas A Stow, Li An
We examine spatial patterns of conifer tree mortality and their changes over time for the montane mixed-conifer forests of San Diego County. These forest areas have recently experienced extensive tree mortality due to multiple factors. A spatial contextual image processing approach was utilized with high spatial resolution digital airborne imagery to map dead trees for the years 1997, 2000, 2002, and 2005 for three study areas: Palomar, Volcan, and Laguna mountains. Plot-based fieldwork was conducted to further assess mortality patterns...
July 17, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28718074/advances-in-imaging-instrumentation-for-nuclear-cardiology
#10
Jae Sung Lee, Gil Kovalski, Tali Sharir, Dong Soo Lee
Advances in imaging instrumentation and technology have greatly contributed to nuclear cardiology. Dedicated cardiac SPECT cameras incorporating novel, highly efficient detector, collimator, and system designs have emerged with the expansion of nuclear cardiology. Solid-state radiation detectors incorporating cadmium zinc telluride, which directly convert radiation to electrical signals and yield improved energy resolution and spatial resolution and enhanced count sensitivity geometries, are increasingly gaining favor as the detector of choice for application in dedicated cardiac SPECT systems...
July 17, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28718018/the-environmental-legacy-of-historic-pb-zn-ag-au-mining-in-river-basins-of-the-southern-edge-of-the-massif-central-france
#11
Françoise Elbaz-Poulichet, Eléonore Resongles, Chrystelle Bancon-Montigny, Sophie Delpoux, Rémi Freydier, Corinne Casiot
The main rivers (Aude, Orb, Herault) that discharge into the Gulf of Lions and the west bank tributaries of the Rhone River including the Gardon have former non-ferrous metal mines in their upper drainage basin. Using unpublished data and data from the literature, this study provides an integrated overview of the contamination of water and sediment along the continent-sea continuum and of its impacts on the biota and on human health. In the upper part of these basins, water and stream sediments are enriched in metal(-loids) compared to median European concentrations...
July 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28717932/a-w-geometry-ortho-tof-ms-with-high-resolution-and-up-to-100-duty-cycle-for-ms-ms
#12
Igor V Chernushevich, Samuel I Merenbloom, Suya Liu, Nic Bloomfield
Orthogonal injection time-of-flight (orthoTOF) mass spectrometry (MS) is the most prevalent form of TOFMS, owing to its greater control over incoming ion energy, the ability to correct for aberrations in incoming ion velocity and position, and its ability to provide an entire mass spectrum within a single scan. However, the duty cycle of orthoTOFMS is low compared with scanning analyzers, which can have 100% duty cycle when measuring a single type of ion. Typical duty cycles for orthoTOFMS range from 1% to 30%, depending on instrument geometry...
July 17, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28717898/thiophene-based-rhodamine-as-selectivef-luorescence-probe-for-fe-iii-and-al-iii-in-living-cells
#13
Kun-Peng Wang, Ju-Peng Chen, Si-Jie Zhang, Yang Lei, Hua Zhong, Shaojin Chen, Xin-Hong Zhou, Zhi-Qiang Hu
The thiophene-modified rhodamine 6G (GYJ) has been synthesized as a novel chemosensor. The sensor has sufficiently high selectivity and sensitivity for the detection of Fe(3+) and Al(3+) ions (M(3+)) by fluorescence and ultraviolet spectroscopy with a strong ability for anti-interference performance. The binding ratio of M(3+)-GYJ complex was determined to be 2:1 according to the Job's plot. The binding constants for Fe(3+) and Al(3+) were calculated to be 3.91 × 10(8) and 5.26 × 10(8) M(-2), respectively...
July 17, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28717896/optimization-of-lipid-extraction-and-analytical-protocols-for-uhplc-esi-hrms-based-lipidomic-analysis-of-adherent-mammalian-cancer-cells
#14
Huizhen Zhang, Yue Gao, Jiahong Sun, Shicheng Fan, Xinpeng Yao, Xiaorong Ran, Chuanqi Zheng, Min Huang, Huichang Bi
Lipidomics, which reveals comprehensive characterization of molecular lipids, is a rapidly growing technology used in biomedical research. Lipid extraction is a critical step in lipidomic analysis. However, the effectiveness of different lipid extract solvent systems from cellular samples still remains unclear. In the current study, the protocol of reverse-phase liquid chromatography mass spectrometry (LC/MS)-based lipidomics was optimized for extraction and detection of lipids from human pancreatic cancer cell line PANC-1...
July 17, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28717785/the-effects-of-high-concentrations-of-ionic-liquid-on-gb1-protein-structure-and-dynamics-probed-by-high-resolution-magic-angle-spinning-nmr-spectroscopy
#15
Lisa Warner, Erica Gjersing, Shelby E Follett, K Wade Elliott, Sergei V Dzyuba, Krisztina Varga
Ionic liquids have great potential in biological applications and biocatalysis, as some ionic liquids can stabilize proteins and enhance enzyme activity, while others have the opposite effect. However, on the molecular level, probing ionic liquid interactions with proteins, especially in solutions containing high concentration of ionic liquids, has been challenging. In the present work the (13)C, (15)N-enriched GB1 model protein was used to demonstrate applicability of high-resolution magic-angle-spinning (HR-MAS) NMR spectroscopy to investigate ionic liquid - protein interactions...
December 2016: Biochemistry and Biophysics Reports
https://www.readbyqxmd.com/read/28717584/pulse-wave-analysis-with-diffusing-wave-spectroscopy
#16
Markus Belau, Wolfgang Scheffer, Georg Maret
Hypertension is a major risk factor for cardiovascular disease and thus at the origin of many deaths by e.g. heart attack or stroke. Hypertension is caused by many factors including an increase in arterial stiffness which leads to changes in pulse wave velocity and wave reflections. Those often result in an increased left ventricular load which may result in heart failure as well as an increased pulsatile pressure in the microcirculation l to damage to blood vessels. In order to specifically treat the different causes of hypertension it is desirable to perform a pulse wave analysis as a complement to measurements of systolic and diastolic pressure by brachial cuff sphygmomanometry...
July 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28717582/in-vivo-multiphoton-imaging-of-a-diverse-array-of-fluorophores-to-investigate-deep-neurovascular-structure
#17
David R Miller, Ahmed M Hassan, Jeremy W Jarrett, Flor A Medina, Evan P Perillo, Kristen Hagan, S M Shams Kazmi, Taylor A Clark, Colin T Sullender, Theresa A Jones, Boris V Zemelman, Andrew K Dunn
We perform high-resolution, non-invasive, in vivo deep-tissue imaging of the mouse neocortex using multiphoton microscopy with a high repetition rate optical parametric amplifier laser source tunable between λ=1,100 and 1,400 nm. By combining the high repetition rate (511 kHz) and high pulse energy (400 nJ) of our amplifier laser system, we demonstrate imaging of vasculature labeled with Texas Red and Indocyanine Green, and neurons expressing tdTomato and yellow fluorescent protein. We measure the blood flow speed of a single capillary at a depth of 1...
July 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28717575/flow-mediated-dilatation-test-using-optoacoustic-imaging-a-proof-of-concept
#18
Angelos Karlas, Josefine Reber, Gael Diot, Dmitry Bozhko, Maria Anastasopoulou, Tareq Ibrahim, Markus Schwaiger, Fabien Hyafil, Vasilis Ntziachristos
Label-free multispectral optoacoustic tomography (MSOT) has recently shown superior performance in visualizing the morphology of human vasculature, especially of smaller vessels, compared to ultrasonography. Herein, we extend these observations towards MSOT interrogation of macrovascular endothelial function. We employed a real-time handheld MSOT scanner to assess flow-mediated dilatation (FMD), a technique used to characterize endothelial function. A data processing scheme was developed to quantify the dimensions and diameter changes of arteries in humans and determine wall distensibility parameters...
July 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28717571/visible-spectrum-extended-focus-optical-coherence-microscopy-for-label-free-sub-cellular-tomography
#19
Paul J Marchand, Arno Bouwens, Daniel Szlag, David Nguyen, Adrien Descloux, Miguel Sison, Séverine Coquoz, Jérôme Extermann, Theo Lasser
We present a novel extended-focus optical coherence microscope (OCM) attaining 0.7 μm axial and 0.4 μm lateral resolution maintained over a depth of 40 μm, while preserving the advantages of Fourier domain OCM. Our system uses an ultra-broad spectrum from a supercontinuum laser source. As the spectrum spans from near-infrared to visible wavelengths (240 nm in bandwidth), we call the system visOCM. The combination of such a broad spectrum with a high-NA objective creates an almost isotropic 3D submicron resolution...
July 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28717570/chip-on-the-tip-compact-flexible-endoscopic-epifluorescence-video-microscope-for-in-vivo-imaging-in-medicine-and-biomedical-research
#20
Gregor Matz, Bernhard Messerschmidt, Werner Göbel, Severin Filser, Christian S Betz, Matthias Kirsch, Ortrud Uckermann, Marcel Kunze, Sven Flämig, André Ehrhardt, Klaus-Martin Irion, Mareike Haack, Mario M Dorostkar, Jochen Herms, Herbert Gross
We demonstrate a 60 mg light video-endomicroscope with a cylindrical shape of the rigid tip of only 1.6 mm diameter and 6.7 mm length. A novel implementation method of the illumination unit in the endomicroscope is presented. It allows for the illumination of the biological sample with fiber-coupled LED light at 455 nm and the imaging of the red-shifted fluorescence light above 500 nm in epi-direction. A large numerical aperture of 0.7 leads to a sub-cellular resolution and yields to high-contrast images within a field of view of 160 μm...
July 1, 2017: Biomedical Optics Express
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