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Guido Vallerotto, Marta Victoria, Stephen Askins, Ignacio Antón, Gabriel Sala, Rebeca Herrero, César Domínguez
We present a method to characterize achromatic Fresnel lenses for photovoltaic applications. The achromatic doublet on glass (ADG) Fresnel lens is composed of two materials, a plastic and an elastomer, whose dispersion characteristics (refractive index variation with wavelength) are different. We first designed the lens geometry and then used ray-tracing simulation, based on the Monte Carlo method, to analyze its performance from the point of view of both optical efficiency and the maximum attainable concentration...
October 27, 2017: Journal of Visualized Experiments: JoVE
Hélène N David, Benoit Haelewyn, Jean-Éric Blatteau, Jean-Jacques Risso, Nicolas Vallée, Jacques H Abraini
Xenon (Xe) is considered to be the golden standard neuroprotective gas. However, Xe has a higher molecular weight and lower thermal conductivity and specific heat than those of nitrogen, the main diluent of oxygen in air. These physical characteristics could impair or at least reduce the intrinsic neuroprotective action of Xe by increasing the patient's respiratory workload and body temperature. In contrast, helium (He) is a cost-efficient gas with a lower molecular weight and higher thermal conductivity and specific heat than those of nitrogen, but is far less potent than Xe...
July 2017: Medical Gas Research
Jacques H Abraini, Hélène N David, Jean-Éric Blatteau, Jean Jacques Risso, Nicolas Vallée
The noble gases xenon (Xe) and helium (He) are known to possess neuroprotective properties. Xe is considered the golden standard neuroprotective gas. However, Xe has a higher molecular weight and lower thermal conductivity and specific heat than those of nitrogen, the main diluent of oxygen (O2) in air, conditions that could impair or at least reduce the intrinsic neuroprotective properties of Xe by increasing the critical care patient's respiratory workload and body temperature. In contrast, He has a lower molecular weight and higher thermal conductivity and specific heat than those of nitrogen, but is unfortunately far less potent than Xe at providing neuroprotection...
July 2017: Medical Gas Research
O Pravdivtseva, A Meshik, C M Hohenberg, A N Krot
It is inferred that magnesian non-porphyritic chondrules in the CB (Bencubbin-type) carbonaceous chondrites formed in an impact generated plume of gas and melt at 4562.49 ± 0.21 Ma (Bollard et al., 2015) and could be suitable for the absolute age normalization of relative chronometers. Here xenon isotopic compositions of neutron irradiated chondrules from the CB chondrites Gujba and Hammadah al Hamra (HH) 237 have been analyzed in an attempt to determine closure time of their I-Xe isotope systematics. One of the HH 237 chondrules, #1, yielded a well-defined I-Xe isochron that corresponds to a closure time of 0...
March 15, 2017: Geochimica et Cosmochimica Acta
Gaëlle Milanole, Bo Gao, Audrey Paoletti, Grégory Pieters, Christophe Dugave, Eric Deutsch, Sofia Rivera, Frédéric Law, Jean-Luc Perfettini, Emilie Mari, Estelle Léonce, Céline Boutin, Patrick Berthault, Hervé Volland, François Fenaille, Thierry Brotin, Bernard Rousseau
Although Non-Small Cell Lung Cancer (NSCLC) is one of the main causes of cancer death, very little improvement has been made in the last decades regarding diagnosis and outcomes. In this study, a bimodal fluorescence/(129)Xe NMR probe containing a xenon host, a fluorescent moiety and a therapeutic antibody has been designed to target the Epidermal Growth Factor Receptors (EGFR) overexpressed in cancer cells. This biosensor shows high selectivity for the EGFR, and a biological activity similar to that of the antibody...
November 6, 2017: Bioorganic & Medicinal Chemistry
Christian Stoppe, Julia Ney, Martin Brenke, Andreas Goetzenich, Christoph Emontzpohl, Gereon Schälte, Oliver Grottke, Manfred Moeller, Rolf Rossaint, Mark Coburn
Page 1764, Column 2, `Acknowledgements' section: The first sentence, which previously read.
November 17, 2017: Sports Medicine
Biyi Chen, Weiqiang Fan, Baodong Mao, Hao Shen, Weidong Shi
It is well known that bimetallic nanomaterials usually exhibit unique catalytic, optical, electric and magnetic properties due to the synergistic effect between different metals. In this work, we reported on a scalable method to fabricate an AuPt bimetallic core-shell nanoparticles loaded hematite (α-Fe2O3) photoanode for solar-driven photoelectrochemical water oxidation. Compared to single metal-modified α-Fe2O3 photoanodes, the AuPt bimetallic core-shell nanoparticles loaded α-Fe2O3 photoanodes exhibited a synergistic effect for photoelectrochemical water oxidation...
November 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Hannah Gill
No abstract text is available yet for this article.
December 2017: Paediatric Anaesthesia
Nathalie Colloc'h, Philippe Carpentier, Laura C Montemiglio, Beatrice Vallone, Thierry Prangé
Internal cavities are crucial for conformational flexibility of proteins and can be mapped through noble gas diffusion and docking. Here we investigate the hydrophobic cavities and tunnel network in neuroglobin (Ngb), a hexacoordinated heme protein likely to be involved in neuroprotection, using crystallography under noble gas pressure, mostly at room temperature. In murine Ngb, a large internal cavity is involved in the heme sliding mechanism to achieve binding of gaseous ligands through coordination to the heme iron...
November 3, 2017: Biophysical Journal
Jim M Wild
No abstract text is available yet for this article.
November 3, 2017: Thorax
Antonio Frontera, Antonio Bauzá
In this manuscript the ability of organoxenon fluorides to establish concurrent π-hole aerogen bonding and lone pair/anion-π interactions has been studied at the RI-MP2/def2-TZVP level of theory. The presence of both an aromatic system (benzene, trifluorobenzene and pentafluorobenzene) and a xenon atom makes these molecules suitable for simultaneously establishing both interactions. In this regard, we have used CH3CN, NH3, O(CH3)2, Cl(-), CN(-) and BF4(-) as neutral and charged electron donors, respectively...
November 2, 2017: Physical Chemistry Chemical Physics: PCCP
Wenjie Yu, Lester Andrews, Xuefeng Wang
Laser ablated Be atoms, cations and electrons were reacted with F2, ClF, Cl2, NF3, CCl4, CF2Cl2, HCl, DCl, and SiCl4 diluted in noble gases. The major products were the dihalides BeF2, BeClF, BeCl2 and the hydride chloride HBeCl whose identities were confirmed by comparison with previous evaporative work, deuterium substitution, and vibrational frequency calculations. The matrix isolated BeF molecule fundamental frequency is higher and the BeCl frequency is lower than determined for the gas phase molecules, respectively...
November 1, 2017: Journal of Physical Chemistry. A
Weihua Zhang, Kurt Ungar
This article presents the results of atmospheric radioactivity monitoring obtained by three Canadian radiation monitoring stations before, after and during Fukushima-Daiichi accident. It includes 210 Pb, 212 Pb and 7 Be (naturally occurring radionuclides) and 131 I, 132 I, 129 Te, 129 m Te, 132 Te, 134 Cs, 136 Cs, 137 Cs and 133 Xe (Fukushima contaminants). The maximum activity concentrations were in range of 2.3-3.7 Bq/m 3 for 133 Xe; 2.0-4.4 mBq/m 3 for 131 I in aerosol form; 0.27-0.83 mBq/m 3 for 137 Cs depending on monitoring locations...
October 21, 2017: Radiation Protection Dosimetry
Andrea K Pinto-Martinez, Jessica Rodriguez-Durán, Xenon Serrano-Martin, Vanessa Hernandez-Rodriguez, Gustavo Benaim
Leishmania donovani is the causing agent of visceral leishmaniasis, a common infection that affects millions of people from the most underdeveloped countries. Miltefosine is the only oral drug to treat infections caused by L. donovani. Nevertheless, its mechanism of action is not well understood. While miltefosine inhibits the synthesis of phosphatidylcholine, and also affects the parasite mitochondrion inhibiting the cytochrome C oxidase, it is to be expected that this potent drug also produces its effect through other targets...
October 23, 2017: Antimicrobial Agents and Chemotherapy
Haoming Bao, Hongwen Zhang, Le Zhou, Guangqiang Liu, Yue Li, Weiping Cai
Controllable and flexible fabrication of ultrathin and uniform oxide layer-wrapped noble metal nanoparticles (NPs) has been expected. Here a new strategy is presented for them based on colloidal electrostatic attraction and self-assembly on the metal NPs via one-step laser ablation of noble metal targets in the hydrolysis-induced hydroxide sol solutions at room temperature. The Au NPs, with several tens of nanometers in size, are taken as core part and TiO2 as shell-layer to demonstrate the validity of the presented strategy...
November 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Marcelo L Wilde, Jakob Menz, Christoph Leder, Klaus Kümmerer
The lack of studies on the fate and effects of drug metabolites in the environment is of concern. As their parent compounds, metabolites enter the aquatic environment and are subject to biotic and abiotic process. In this regard, photolysis plays an important role. This study combined experimental and in silico quantitative structure-activity relationship (QSAR) methods to assess the fate and effects of Mesoridazine (MESO), a pharmacologically active human drug and metabolite of the antipsychotic agent Thioridazine, and its transformation products (TPs) formed through a Xenon lamp irradiation...
October 18, 2017: Science of the Total Environment
Manabu Kanno, Nobuyoshi Inada, Hirohiko Kono
We theoretically explore the effects of optical ellipticity on single-active-electron multiphoton excitation in atoms and (nearly) spherical molecules irradiated by intense polarized laser fields. This work was motivated by the experimental and theoretical studies of Hertel et al. [Phys. Rev. Lett. 102, 023003 (2009) and Phys. Rev. A 79, 053414 (2009)], who reported pronounced changes in the near-infrared-induced ion yields of xenon and C60 as a function of ellipticity (in particular, yield reduction for circular polarization) at low light intensities and derived a perturbative cross section formula to describe such polarization effects by assuming that the excited-state energies and radial transition electric dipole moments of the system are independent of the azimuthal quantum number l...
October 21, 2017: Journal of Chemical Physics
Zhigang Li, Xiaoxu Wang, Yuquan Zheng, Futian Li
High-accuracy absolute detector-based spectroradiometric calibration techniques traceable to cryogenic absolute radiometers have made progress rapidly in recent decades under the impetus of atmospheric quantitative spectral remote sensing. A high brightness spectrally tunable radiant source using a supercontinuum fiber laser and a digital micromirror device (DMD) has been developed to meet demands of spectroradiometric calibrations for ground-based, aeronautics-based, and aerospace-based remote sensing instruments and spectral simulations of natural scenes such as the sun and atmosphere...
June 10, 2017: Applied Optics
Bruna Santangelo, Astrid Robin, Keith Simpson, Julie Potier, Michel Guichardant, Karine Portier
INTRODUCTION: Xenon, due to its interesting anesthetic properties, could improve the quality of anesthesia protocols in horses despite its high price. This study aimed to modify and test an anesthesia machine capable of delivering xenon to a horse. MATERIALS AND METHODS: An equine anesthesia machine (Tafonius, Vetronic Services Ltd., UK) was modified by including a T-connector in the valve block to introduce xenon, so that the xenon was pushed into the machine cylinder by the expired gases...
2017: Frontiers in Veterinary Science
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