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https://www.readbyqxmd.com/read/28227992/modeling-and-design-of-antennas-for-implantable-telemetry-applications
#1
Arun Venkatasubramanian, Brandon Gifford, Arun Venkatasubramanian, Brandon Gifford, Brandon Gifford, Arun Venkatasubramanian
Incorporating an RF communications link in an implanted medical device can increase its range of applicability and improve quality of life for the patient. Developments in support electronics decrease design risk, but the implanted antenna remains a critical component of a communications link that operates at very low received power. Transmitted power is limited both by regulatory restrictions and, for most implanted devices, by power source capacity. Dielectric losses and wave trapping in the body result in transmission losses much greater than seen in free space communications...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226447/automatic-tissue-characterization-of-air-trapping-in-chest-radiographs-using-deep-neural-networks
#2
Awais Mansoor, Geovanny Perez, Gustavo Nino, Marius George Linguraru, Awais Mansoor, Geovanny Perez, Gustavo Nino, Marius George Linguraru, Geovanny Perez, Marius George Linguraru, Gustavo Nino, Awais Mansoor
Significant progress has been made in recent years for computer-aided diagnosis of abnormal pulmonary textures from computed tomography (CT) images. Similar initiatives in chest radiographs (CXR), the common modality for pulmonary diagnosis, are much less developed. CXR are fast, cost effective and low-radiation solution to diagnosis over CT. However, the subtlety of textures in CXR makes them hard to discern even by trained eye. We explore the performance of deep learning abnormal tissue characterization from CXR...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226214/selective-encaging-of-n2o-in-n2o-n2-binary-gas-hydrates-via-hydrate-based-gas-separation
#3
Youjeong Yang, Donghoon Shin, Seunghyun Choi, Yesol Woo, Jong-Won Lee, Dongseon Kim, Hee-Young Shin, Minjun Cha, Ji-Ho Yoon
The crystal structure and guest inclusion behaviors of nitrous oxide-nitrogen (N2O-N2) binary gas hydrates formed from N2O/N2 gas mixtures are determined through spectroscopic analysis. Powder X-ray diffraction results indicate that the crystal structure of all the N2O-N2 binary gas hydrates is identified as the structure I (sI) hydrate. Raman spectra for N2O-N2 binary gas hydrate formed from N2O/N2 (80/20, 60/40, 40/60 mol %) gas mixtures reveal that N2O molecules occupy both large and small cages of the sI hydrate...
February 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28225600/kinetics-and-mechanism-of-ultrasonic-activation-of-persulfate-an-in-situ-epr-spin-trapping-study
#4
Zongsu Wei, Frederick A Villamena, Linda K Weavers
Ultrasound (US) was shown to activate persulfate (PS) providing an alternative activation method to base or heat as an in-situ chemical oxidation (ISCO) method. The kinetics and mechanism of ultrasonic activation of PS were examined in aqueous solution using an in-situ electron paramagnetic resonance (EPR) spin trapping technique and radical trapping with probe compounds. Using the spin trap, 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), hydroxyl radical (•OH) and sulfate radical anion (SO4•‒) were measured from ultrasonic activation of persulfate (US-PS)...
February 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28225562/the-adipokinetic-hormone-of-mantodea-in-comparison-to-other-dictyoptera
#5
Gerd Gäde, Heather G Marco
Six species of the order Mantodea (praying mantises) are investigated for the presence and sequence of putative adipokinetic hormones (AKHs). The selected species span a wide evolutionary range of various families and subfamilies of the clade Mantodea. The corpora cardiaca of the different species are dissected, methanolic extracts prepared, peptides separated by liquid chromatography, and AKHs detected and sequenced by ion trap mass spectrometry. All six species investigated contain an octapeptide with the primary structure pGlu-Val-Asn-Phe-Thr-Pro-Asn-Trp amide, which is code-named Emppe-AKH and had been found earlier in three other species of Mantodea...
February 22, 2017: Archives of Insect Biochemistry and Physiology
https://www.readbyqxmd.com/read/28224911/determination-of-total-cyanide-in-soil-by-isotope-dilution-gc-ms-following-pentafluorobenzyl-derivatization
#6
Beatrice Campanella, Lorenzo Biancalana, Lucia D'Ulivo, Massimo Onor, Emilia Bramanti, Zoltan Mester, Enea Pagliano
The high toxicity of cyanide, along with its widespread industrial use, has fuelled interest in the development of analytical methods for its determination in complex matrices. In this study, we propose a novel approach for the measurement of total cyanide in soil samples based on single-step derivatization with pentafluorobenzyl bromide (F5Bn-Br) followed by quantitation with gas chromatography mass spectrometry in negative chemical ionization mode. The reaction between CN(-) and F5Bn-Br resulted in the identification of several derivatives such as F5Bn-CN, (F5Bn)(F5Ph)CH-CN, and (F5Bn)2(F5Ph)C-CN...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28224910/identification-of-sink-spots-in-two-thermal-desorption-gc-ms-systems-for-the-analysis-of-polycyclic-aromatic-hydrocarbons
#7
Yingjie Li, Jiping Zhu
Thermal desorption (TD) GC/MS has been used for the analysis of polycyclic aromatic hydrocarbons (PAHs) and other semi-volatile organic compounds. However, thermal desorption recovery of PAHs have not been well studied and the cause of PAH residues in a TD system has not been clearly understood. Our results showed that low volatility of PAHs can lead to their incomplete recovery in a TD system: for the PAHs with low vapour pressures, up to 10% and 3% could be lost in a two-stage (TS) TD system and a short-path (SP) TD system, respectively...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28223547/cabozantinib-targets-bone-microenvironment-modulating-human-osteoclast-and-osteoblast-functions
#8
Marco Fioramonti, Daniele Santini, Michele Iuliani, Giulia Ribelli, Paolo Manca, Nicola Papapietro, Filippo Spiezia, Bruno Vincenzi, Vincenzo Denaro, Antonio Russo, Giuseppe Tonini, Francesco Pantano
Cabozantinib, a c-MET and vascular endothelial growth factor receptor 2 inhibitor, demonstrated to prolong progression free survival and improve skeletal disease-related endpoints in castration-resistant prostate cancer and in metastatic renal carcinoma. Our purpose is to investigate the direct effect of cabozantinib on bone microenvironment using a total human model of primary osteoclasts and osteoblasts.Osteoclasts were differentiated from monocytes isolated from healthy donors; osteoblasts were derived from human mesenchymal stem cells obtained from bone fragments of orthopedic surgery patients...
February 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28223492/role-of-degassing-of-the-noril-sk-nickel-deposits-in-the-permian-triassic-mass-extinction-event
#9
Margaux Le Vaillant, Stephen J Barnes, James E Mungall, Emma L Mungall
The largest mass extinction event in Earth's history marks the boundary between the Permian and Triassic Periods at circa 252 Ma and has been linked with the eruption of the basaltic Siberian Traps large igneous province (SLIP). One of the kill mechanisms that has been suggested is a biogenic methane burst triggered by the release of vast amounts of nickel into the atmosphere. A proposed Ni source lies within the huge Noril'sk nickel ore deposits, which formed in magmatic conduits widely believed to have fed the eruption of the SLIP basalts...
February 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28223279/distinct-contributions-of-complement-factors-to-platelet-activation-and-fibrin-formation-in-venous-thrombus-development
#10
Saravanan Subramaniam, Kerstin Jurk, Lukas Hobohm, Sven Jäckel, Mona Saffarzadeh, Kathrin Schwierczek, Philip Wenzel, Florian Langer, Christoph Reinhardt, Wolfram Ruf
Expanding evidence indicates multiple interactions between the hemostatic system and innate immunity and the coagulation and complement cascades. Here we show in a tissue factor (TF)-dependent model of flow restriction-induced venous thrombosis that complement factors (C) make distinct contributions to platelet activation and fibrin deposition. C3-deficiency causes prolonged bleeding, reduced thrombus incidence, thrombus size, fibrin and platelet deposition in the ligated inferior vena cava, and diminished platelet activation in vitro...
February 21, 2017: Blood
https://www.readbyqxmd.com/read/28222859/determination-of-benzimidazoles-in-meat-samples-by-capillary-zone-electrophoresis-tandem-mass-spectrometry-following-dispersive-liquid-liquid-microextraction
#11
Carmen Tejada-Casado, David Moreno-González, Francisco J Lara, Ana M García-Campaña, Monsalud Del Olmo-Iruela
A novel method based on capillary zone electrophoresis-tandem mass spectrometry has been proposed and validated for the identification and simultaneous quantification of twelve benzimidazoles in meat samples. Electrophoretic separation was carried out using 500mM formic acid (pH 2.2) as background electrolyte and applying a voltage of 25kV at 25°C. In order to improve the sensitivity, stacking mode injection was applied, using as injection solvent a mixture of 30:70 acetonitrile/water at 50mbar for 75s. Sensitivity enhancement factors from 74 to 317 were obtained under these conditions...
February 14, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28222708/wild-pollinators-enhance-oilseed-rape-yield-in-small-holder-farming-systems-in-china
#12
Yi Zou, Haijun Xiao, Felix J J A Bianchi, Frank Jauker, Shudong Luo, Wopke van der Werf
BACKGROUND: Insect pollinators play an important role in crop pollination, but the relative contribution of wild pollinators and honey bees to pollination is currently under debate. There is virtually no information available on the strength of pollination services and the identity of pollination service providers from Asian smallholder farming systems, where fields are small, and variation among fields is high. We established 18 winter oilseed rape (Brassica napus L.) fields along a large geographical gradient in Jiangxi province in China...
February 21, 2017: BMC Ecology
https://www.readbyqxmd.com/read/28222195/autoantibodies-against-mono-and-tri-methylated-lysine-display-similar-but-also-distinctive-characteristics
#13
Zhiqiang Wang, Younan Ma, Fan Liu, Linjie Chen, Ruitong Gao, Wei Zhang
Autoantibodies can be either harmful or beneficial to the body. The beneficial autoantibodies play important roles in immunosurveillance, clearance of body waste and maintenance of immune homeostasis. Despite their importance, however, people's knowledge on the protective autoantibodies is still very limited. In the current study, we examined two autoantibodies that recognized epitopes with only one amino acid. One was against mono-methylated lysine (Kme) and the other was against tri-methylated lysine (Kme3)...
2017: PloS One
https://www.readbyqxmd.com/read/28222125/streptococcus-sanguinis-induces-neutrophil-cell-death-by-production-of-hydrogen-peroxide
#14
Ryuichi Sumioka, Masanobu Nakata, Nobuo Okahashi, Yixuan Li, Satoshi Wada, Masaya Yamaguchi, Tomoko Sumitomo, Mikako Hayashi, Shigetada Kawabata
Streptococcus is the dominant bacterial genus in the human oral cavity and a leading cause of infective endocarditis. Streptococcus sanguinis belongs to the mitis group of streptococci and produces hydrogen peroxide (H2O2) by the action of SpxB, a pyruvate oxidase. In this study, we investigated the involvement of SpxB in survival of S. sanguinis in human blood and whether bacterial H2O2 exhibits cytotoxicity against human neutrophils. Results of a bactericidal test with human whole blood revealed that the spxB mutation in S...
2017: PloS One
https://www.readbyqxmd.com/read/28222006/adaptive-discrete-hypergraph-matching
#15
Junchi Yan, Changsheng Li, Yin Li, Guitao Cao
This paper addresses the problem of hypergraph matching using higher-order affinity information. We propose a solver that iteratively updates the solution in the discrete domain by linear assignment approximation. The proposed method is guaranteed to converge to a stationary discrete solution and avoids the annealing procedure and ad-hoc post binarization step that are required in several previous methods. Specifically, we start with a simple iterative discrete gradient assignment solver. This solver can be trapped in an m-circle sequence under moderate conditions, where m is the order of the graph matching problem...
February 17, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28221806/absorption-and-quantum-yield-of-single-conjugated-polymer-meh-ppv-molecules
#16
Lei Hou, Subhasis Adhikari, Yuxi Tian, Ivan G Scheblykin, Michel Orrit
We simultaneously measured the absorption and emission of single conjugated polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) molecules in a PMMA matrix using near-critical xenon to enhance the photothermal contrast for direct absorption measurements. We directly measured the number of monomers and the quantum yield of single conjugated polymer molecules. Simultaneous absorption and emission measurements provide new insight into the photophysics of single conjugated polymers under optical excitation: quenching in larger molecules is more efficient than that of smaller ones...
February 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28221789/raman-spectroscopy-reveals-selective-interactions-of-cytochrome-c-with-cardiolipin-that-correlate-with-membrane-permeability
#17
Jay P Kitt, David A Bryce, Shelley D Minteer, Joel M Harris
Permeabilization of the outer mitochondrial membrane is an integral step in apoptosis. The resulting release of pro-apoptotic signaling proteins leads to cell destruction through activation of the cysteine-aspartic protease (caspase) cascade. However, the mechanism of outer mitochondrial membrane (OMM) permeabilization remains unclear. It was recently shown that cytochrome c can induce pore formation in cardiolipin-containing phospholipid membranes leading to large dextran and protein permeability. In this work, the interaction of cytochrome c with cardiolpin-containing phospholipid vesicles, serving as models of the OMM, is investigated to probe cytochrome c-induced permeability...
February 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28221385/ir-spectroscopic-investigations-of-chemical-and-photochemical-reactions-on-metal-oxides-bridging-the-materials-gap
#18
REVIEW
Yuemin Wang, Christof Wöll
In this review, we highlight recent progress (2008-2016) in infrared reflection absorption spectroscopy (IRRAS) studies on oxide powders achieved by using different types of metal oxide single crystals as reference systems. Precise polarization- and azimuth-dependent IRRAS data recorded for single crystal substrates has allowed for fundamental insights into the surface chemistry and photochemistry of numerous probe molecules on various surfaces exposed by three very important metal oxides (ZnO, TiO2, and CeO2)...
February 21, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28221041/dialkyl-phosphite-initiated-cyclopropanation-of-%C3%AE-%C3%AE-unsaturated-ketones-using-%C3%AE-ketoesters-or-isatin-derivatives
#19
Deng Yin, Hui Liu, Chong-Dao Lu, Yan-Jun Xu
Efficient cyclopropanation of α,β-unsaturated ketones using α-ketoesters or isatin derivatives is reported. The cyclopropanation reaction occurs via a cascade transformation that starts with addition of deprotonated dialkyl phosphite to the keto groups of α-ketoesters or isatin derivatives, followed by [1,2]-phosphonate/phosphate rearrangement to generate α-phosphonyloxyenolate intermediates, which are trapped by α,β-unsaturated ketones via Michael addition/ring closure. This protocol was used to synthesize tetra-substituted cyclopropanes with a 1,2-cis-1,3-trans configuration in high yield with excellent diastereoselectivity...
February 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28220998/self-assembly-of-iodine-in-superfluid-helium-droplets-halogen-bonds-and-nanocrystals
#20
Yunteng He, Jie Zhang, Lei Lei, Wei Kong
We present evidence of halogen bond in iodine clusters formed in superfluid helium droplets based on results from electron diffraction. Iodine crystals are known to form layered structures with intralayer halogen bonds, with interatomic distances shorter than the sum of the van der Waals radii of the two neighboring atoms. The diffraction profile of dimer dominated clusters embedded in helium droplets reveals an interatomic distance of 3.65 Å, much closer to the value of 3.5 Å in iodine crystals than to the van der Waals distance of 4...
February 21, 2017: Angewandte Chemie
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