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https://www.readbyqxmd.com/read/28221806/absorption-and-quantum-yield-of-single-conjugated-polymer-meh-ppv-molecules
#1
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/28195864/profound-hypopnea-with-xenon-anesthesia-in-a-free-diver
#2
LETTER
John R Cormack, Jarrod Gott, Sarah Kondogiannis
No abstract text is available yet for this article.
February 15, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28195746/thermal-variations-of-operative-microscopes-in-otology
#3
T Edward Imbery, Alex J Tampio, Brian D Nicholas
Objectives (1) Measure temperature variations achieved by common otomicroscopes. (2) Raise awareness about possible thermal injury during otologic procedures with the advent of newer, high-powered otomicroscopes. (3) Describe optical technology that aims to reduce the potential for thermal injury. Methods A variety of otomicroscopes, with different light sources (ranging from 100W halogen to 300W xenon), were studied. Temperatures were recorded from human auricular skin with a noncontact infrared thermometer at various microscope light intensities and with use of irrigation...
February 1, 2017: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/28192930/mitochondria-targeted-and-intracellular-biothiol-triggered-hyperpolarized-129-xe-magnetofluorescent-biosensor
#4
Qingbin Zeng, Qianni Guo, Yaping Yuan, Yuqi Yang, Bin Zhang, Lili Ren, Xiaoxiao Zhang, Qing Luo, Maili Liu, Louis-S Bouchard, Xin Zhou
Biothiols such as gluthathione (GSH), cysteine (Cys), homocysteine (Hcy), and thioredoxin (Trx) play vital roles in cellular metabolism. Various diseases are associated with abnormal cellular biothiol levels. Thus, the intracellular detection of biothiol levels could be a useful diagnostic tool. A number of methods have been developed to detect intracellular thiols, but sensitivity and specificity problems have limited their applications. To address these limitations, we have designed a new biosensor based on hyperpolarized xenon magnetic resonance detection, which can be used to detect biothiol levels noninvasively...
February 9, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28190843/application-of-internal-standard-method-for-several-3d-transition-metallic-elements-in-flame-atomic-absorption-spectrometry-using-a-multi-wavelength-high-resolution-spectrometer
#5
Yusuke Toya, Toshiko Itagaki, Kazuaki Wagatsuma
We investigated a simultaneous internal standard method in flame atomic absorption spectrometry (FAAS), in order to better the analytical precision of 3d-transition metals contained in steel materials. For this purpose, a new spectrometer system for FAAS, comprising a bright xenon lamp as the primary radiation source and a high-resolution Echelle monochromator, was employed to measure several absorption lines at a wavelength width of ca. 0.3 nm at the same time, which enables the absorbances of an analytical line and also an internal standard line to be estimated...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28174344/glucagon-like-peptide-1-elicits-vasodilation-in-adipose-tissue-and-skeletal-muscle-in-healthy-men
#6
Ali Asmar, Meena Asmar, Lene Simonsen, Sten Madsbad, Jens J Holst, Bolette Hartmann, Charlotte M Sorensen, Jens Bülow
In healthy subjects, we recently demonstrated that during acute administration of GLP-1, cardiac output increased significantly, whereas renal blood flow remained constant. We therefore hypothesize that GLP-1 induces vasodilation in other organs, for example, adipose tissue, skeletal muscle, and/or splanchnic tissues. Nine healthy men were examined twice in random order during a 2-hour infusion of either GLP-1 (1.5 pmol kg(-1) min(-1)) or saline. Cardiac output was continuously estimated noninvasively concomitantly with measurement of intra-arterial blood pressure...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28161604/-135-xe-measurements-with-a-two-element-czt-based-radioxenon-detector-for-nuclear-explosion-monitoring
#7
Lily Ranjbar, Abi T Farsoni, Eric M Becker
Measurement of elevated concentrations of xenon radioisotopes ((131m)Xe, (133m)Xe, (133)Xe and (135)Xe) in the atmosphere has been shown to be a very powerful method for verifying whether or not a detected explosion is nuclear in nature. These isotopes are among the few with enough mobility and with half-lives long enough to make their detection at long distances realistic. Existing radioxenon detection systems used by the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) suffer from problems such as complexity, need for high maintenance and memory effect...
February 2, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28147226/detectability-of-colorectal-neoplastic-lesions-using-a-novel-endoscopic-system-with-blue-laser-imaging-a-multicenter-randomized-controlled-trial
#8
Hiroaki Ikematsu, Taku Sakamoto, Kazutomo Togashi, Naohisa Yoshida, Takashi Hisabe, Shinsuke Kiriyama, Koji Matsuda, Yoshikazu Hayashi, Takahisa Matsuda, Shozo Osera, Kazuhiro Kaneko, Kenichi Utano, Yuji Naito, Hiroshi Ishihara, Masayuki Kato, Kenichi Yoshimura, Hideki Ishikawa, Hironori Yamamoto, Yutaka Saito
BACKGROUND & AIM: Most studies have not reported an improvement in the detection of adenoma with the use of image-enhanced colonoscopy methods, possibly due to the darkness of the images. To overcome this limitation, a new-generation endoscopic system has been developed. This system has 2 blue-laser imaging (BLI) observation modes. The BLI observation was set to BLI-bright mode to detect lesions. We aimed to evaluate the efficacy of BLI in detecting lesions. METHODS: This study was designed as a randomized controlled trial with participants from 8 institutions...
January 29, 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28144572/photo-ignition-process-of-multiwall-carbon-nanotubes-and-ferrocene-by-continuous-wave-xe-lamp-illumination
#9
Paolo Visconti, Patrizio Primiceri, Daniele Longo, Luciano Strafella, Paolo Carlucci, Mauro Lomascolo, Arianna Cretì, Giuseppe Mele
This work aims to investigate and characterize the photo-ignition phenomenon of MWCNT/ferrocene mixtures by using a continuous wave (CW) xenon (Xe) light source, in order to find the power ignition threshold by employing a different type of light source as was used in previous research (i.e., pulsed Xe lamp). The experimental photo-ignition tests were carried out by varying the weight ratio of the used mixtures, luminous power, and wavelength range of the incident Xe light by using selective optical filters...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28128598/results-from-a-search-for-dark-matter-in-the-complete-lux-exposure
#10
D S Akerib, S Alsum, H M Araújo, X Bai, A J Bailey, J Balajthy, P Beltrame, E P Bernard, A Bernstein, T P Biesiadzinski, E M Boulton, R Bramante, P Brás, D Byram, S B Cahn, M C Carmona-Benitez, C Chan, A A Chiller, C Chiller, A Currie, J E Cutter, T J R Davison, A Dobi, J E Y Dobson, E Druszkiewicz, B N Edwards, C H Faham, S Fiorucci, R J Gaitskell, V M Gehman, C Ghag, K R Gibson, M G D Gilchriese, C R Hall, M Hanhardt, S J Haselschwardt, S A Hertel, D P Hogan, M Horn, D Q Huang, C M Ignarra, M Ihm, R G Jacobsen, W Ji, K Kamdin, K Kazkaz, D Khaitan, R Knoche, N A Larsen, C Lee, B G Lenardo, K T Lesko, A Lindote, M I Lopes, A Manalaysay, R L Mannino, M F Marzioni, D N McKinsey, D-M Mei, J Mock, M Moongweluwan, J A Morad, A St J Murphy, C Nehrkorn, H N Nelson, F Neves, K O'Sullivan, K C Oliver-Mallory, K J Palladino, E K Pease, P Phelps, L Reichhart, C Rhyne, S Shaw, T A Shutt, C Silva, M Solmaz, V N Solovov, P Sorensen, S Stephenson, T J Sumner, M Szydagis, D J Taylor, W C Taylor, B P Tennyson, P A Terman, D R Tiedt, W H To, M Tripathi, L Tvrznikova, S Uvarov, J R Verbus, R C Webb, J T White, T J Whitis, M S Witherell, F L H Wolfs, J Xu, K Yazdani, S K Young, C Zhang
We report constraints on spin-independent weakly interacting massive particle (WIMP)-nucleon scattering using a 3.35×10^{4}  kg day exposure of the Large Underground Xenon (LUX) experiment. A dual-phase xenon time projection chamber with 250 kg of active mass is operated at the Sanford Underground Research Facility under Lead, South Dakota (USA). With roughly fourfold improvement in sensitivity for high WIMP masses relative to our previous results, this search yields no evidence of WIMP nuclear recoils...
January 13, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28119201/design-synthesis-structure-activity-relationship-and-mechanism-of-action-studies-of-a-series-of-4-chloro-1-phthalazinyl-hydrazones-as-a-potent-agent-against-leishmania-braziliensis
#11
Angel H Romero, Rafael Medina, Anamaría Alcala, Yael García-Marchan, Jorge Núñez-Duran, Jacques Leañez, Ali Mijoba, Carlos Ciangherotti, Xenón Serrano-Martín, Simón E López
With the aim to identify a potential drug candidate to treat cutaneous leishmaniasis, a series of 1-phthalazinyl hydrazones were synthesized and tested against Leishmania braziliensis parasite, one of the main responsible of this disease in the world. A structure-activity relationship permitted to identify two phthalazines containing nitroheterocyclic moiety 3l and 3m as promising new lead compounds. These compounds showed a significant antileishmanial activity against promastigote form of L. braziliensis, with EC50 values in sub-micromolar and nanomolar ranges...
February 15, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28112157/wafer-scale-integration-of-sacrificial-nanofluidic-chips-for-detecting-and-manipulating-single-dna-molecules
#12
Chao Wang, Sung-Wook Nam, John M Cotte, Christopher V Jahnes, Evan G Colgan, Robert L Bruce, Markus Brink, Michael F Lofaro, Jyotica V Patel, Lynne M Gignac, Eric A Joseph, Satyavolu Papa Rao, Gustavo Stolovitzky, Stanislav Polonsky, Qinghuang Lin
Wafer-scale fabrication of complex nanofluidic systems with integrated electronics is essential to realizing ubiquitous, compact, reliable, high-sensitivity and low-cost biomolecular sensors. Here we report a scalable fabrication strategy capable of producing nanofluidic chips with complex designs and down to single-digit nanometre dimensions over 200 mm wafer scale. Compatible with semiconductor industry standard complementary metal-oxide semiconductor logic circuit fabrication processes, this strategy extracts a patterned sacrificial silicon layer through hundreds of millions of nanoscale vent holes on each chip by gas-phase Xenon difluoride etching...
January 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28111848/clathrate-structure-determination-by-combining-crystal-structure-prediction-with-computational-and-experimental-%C3%A2-%C3%A2-%C3%A2-xe-nmr-spectroscopy
#13
Marcin Selent, Jonas Nyman, Juho Roukala, Marek Ilczyszyn, Raija Oilunkaniemi, Peter J Bygrave, Risto Laitinen, Jukka Jokisaari, Graeme M Day, Perttu Lantto
We present an approach for the structure determination of clathrates using NMR spectroscopy of enclathrated xenon to select from a set of predicted crystal structures. Crystal structure prediction methods have been used to generate an ensemble of putative structures of o- and m-fluorophenol, whose previously unknown clathrate structures have been studied by ¹²⁹Xe NMR spectroscopy. The high sensitivity of the ¹²⁹Xe chemical shift tensor to the chemical environment and shape of the crystalline cavity makes it ideal as a probe for porous materials...
January 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28107411/xenon-enhanced-dual-energy-ct-imaging-in-combined-pulmonary-fibrosis-and-emphysema
#14
Keishi Sugino, Masahiro Kobayashi, Yasuhiko Nakamura, Kyoko Gocho, Fumiaki Ishida, Kazutoshi Isobe, Nobuyuki Shiraga, Sakae Homma
BACKGROUND: Little has been reported on the feasibility of xenon-enhanced dual-energy computed tomography (Xe-DECT) in the visual and quantitative analysis of combined pulmonary fibrosis and emphysema (CPFE). OBJECTIVES: We compared CPFE with idiopathic pulmonary fibrosis (IPF) and chronic obstructive pulmonary disease (COPD), as well as correlation with parameters of pulmonary function tests (PFTs). METHODS: Studied in 3 groups were 25 patients with CPFE, 25 with IPF without emphysema (IPF alone), 30 with COPD...
2017: PloS One
https://www.readbyqxmd.com/read/28106110/in-vivo-detection-of-cucurbit-6-uril-a-hyperpolarized-xenon-contrast-agent-for-a-xenon-magnetic-resonance-imaging-biosensor
#15
Francis T Hane, Tao Li, Peter Smylie, Raiili M Pellizzari, Jennifer A Plata, Brenton DeBoef, Mitchell S Albert
The Hyperpolarized gas Chemical Exchange Saturation Transfer (HyperCEST) Magnetic Resonance (MR) technique has the potential to increase the sensitivity of a hyperpolarized xenon-129 MRI contrast agent. Signal enhancement is accomplished by selectively depolarizing the xenon within a cage molecule which, upon exchange, reduces the signal in the dissolved phase pool. Herein we demonstrate the in vivo detection of the cucurbit[6]uril (CB6) contrast agent within the vasculature of a living rat. Our work may be used as a stepping stone towards using the HyperCEST technique as a molecular imaging modality...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28101162/correlation-between-high-perfusion-syndrome-and-stent-restenosis-after-stent-implantation
#16
Yingyi Li, Lingtao Tang, Dong Qi, Chunlei Wang, Suxia Zhang, Pengfei Hu, Yun Wang, Bogang Zhang, Kunxi Zhang
The present study was conducted to determine the correlation between high perfusion syndrome and stent restenosis after cerebral vascular stent implantation. A total of 146 patients diagnosed with cerebral vascular stenosis and stent implantation were selected. A total of 55 cases (37.67%) of cerebral hyperperfusion syndrome patients were diagnosed by xenon-enhanced computer tomography (Xe-CT) examination and clinical symptoms within 3 days after surgery and were chosen as the observation group. A total of 91 cases were selected as the control group...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28099359/evaluation-of-pulmonary-function-using-single-breath-hold-dual-energy-computed-tomography-with-xenon-results-of-a-preliminary-study
#17
Hiroyuki Kyoyama, Yusuke Hirata, Satoshi Kikuchi, Kosuke Sakai, Yuriko Saito, Shintaro Mikami, Gaku Moriyama, Hisami Yanagita, Wataru Watanabe, Katharina Otani, Norinari Honda, Kazutsugu Uematsu
Xenon-enhanced dual-energy computed tomography (xenon-enhanced CT) can provide lung ventilation maps that may be useful for assessing structural and functional abnormalities of the lung. Xenon-enhanced CT has been performed using a multiple-breath-hold technique during xenon washout. We recently developed xenon-enhanced CT using a single-breath-hold technique to assess ventilation. We sought to evaluate whether xenon-enhanced CT using a single-breath-hold technique correlates with pulmonary function testing (PFT) results...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28089268/analysis-of-radioxenon-and-krypton-85-at-the-bfs-noble-gas-laboratory
#18
C Schlosser, A Bollhöfer, S Schmid, R Krais, J Bieringer, M Konrad
Proportional counters and a β-γ coincidence system and their performance characteristics are described, with emphasis on internal and external quality controls. Typical limits of detection (LD) are 8mBqm(-3) for (85)Kr and 4mBqm(-3) for (133)Xe for the proportional counters, while for similar xenon volumes the LD for (133)Xe in the β-γ system is approximately 4 times lower. Results of comparative analyses agree above the limit of quantification. Xenon-133 levels in southern Germany are presently at or below the LD of the proportional counters, but above the LD of the β-γ system, which is now routinely used for analysis of environmental samples...
December 28, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28089086/improved-pressurized-marinelli-beaker-measurements-of-radioactive-xenon-in-air
#19
Troy Robinson, Nick Mann, Tracy Houghton, Matthew Watrous, John Peterson, Paul Fabian, Pat Hipp, Mark Reavis, Francisco Fernandez
INL has shown that a Marinelli beaker geometry can be used for the measurement of radioactive xenon in air using an aluminum Marinelli. A carbon fiber Marinelli was designed and constructed to improve overall performance. This composite Marinelli can withstand sample pressures of 276bar and achieve approximately a 4x performance improvement in the minimum detectable concentrations (MDCs) and concentration uncertainties. The MDCs obtained during a 24h assay for (133)Xe, (131m)Xe, and (135)Xe are: 1.4, 13, and 0...
January 4, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28065636/neuroprotection-and-neurotoxicity-in-the-developing-brain-an-update-on-the-effects-of-dexmedetomidine-and-xenon
#20
Azeem Alam, Ka Chun Suen, Zac Hana, Robert D Sanders, Mervyn Maze, Daqing Ma
Growing and consistent preclinical evidence, combined with early clinical epidemiological observations, suggest potentially neurotoxic effects of commonly used anesthetic agents in the developing brain. This has prompted the FDA to issue a safety warning for all sedatives and anesthetics approved for use in children under three years of age. Recent studies have identified dexmedetomidine, the potent α2-adrenoceptor agonist, and xenon, the noble gas, as effective anesthetic adjuvants that are both less neurotoxic to the developing brain, and also possess neuroprotective properties in neonatal and other settings of acute ongoing neurologic injury...
January 5, 2017: Neurotoxicology and Teratology
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