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Bogdan Pavel, Camelia Alexandra Acatrinei, Maria Corbu, Carmen Mihaela Denise Zahiu, Adrian Eugen Rosca, Leon Zagrean, Ana-Maria Zagrean
BACKGROUND AND AIMS: The purpose of this study is to assess the frontal and parietal ECoG spectrum (gamma range) changes during isoflurane and combined xenon-isoflurane anaesthesia in rats. METHODS: Experiments were carried out on four adult male Sprague-Dawley rats (250-300 g). The anaesthesia was induced with isoflurane and maintained with isoflurane and a xenon-isoflurane mixture. The rats were maintained at two different anaesthetic depths: light (isoflurane anaesthesia) and deep (isoflurane and xenon-isoflurane anaesthesia)...
April 2017: Rom J Anaesth Intensive Care
G B Hess, Yu Xia
We report a study of displacement by xenon of a monolayer of sulphur hexafluoride initially condensed on a graphite surface. Earlier work showed that, below 112 K, Xe displaces SF6 almost completely in a first-order transition. Working at higher temperatures, we show that this system has a simple eutectic-like phase diagram, at least for SF6 not too dilute. In our experiment, both adsorbates are in equilibrium with their respective vapors in a cold cell. In our infrared reflection-absorption spectroscopy measurements, the SF6 coverage on the surface is monitored by the frequency shift due to dynamic dipole coupling of the collective mode of the strong SF6 ν3 vibrational resonance...
September 7, 2017: Journal of Chemical Physics
Yvette Véronique Ntsogo Enguéné, Gilles Phan, Cyril Garnier, Arnaud Ducruix, Thierry Prangé, Isabelle Broutin
Tripartite efflux pumps are among the main actors responsible for antibiotics resistance in Gram-negative bacteria. In the last two decades, structural studies gave crucial information about the assembly interfaces and the mechanistic motions. Thus rigidifying the assembly seems to be an interesting way to hamper the drug efflux. In this context, xenon is a suitable probe for checking whether small ligands could act as conformational lockers by targeting hydrophobic cavities. Here we focus on OprN, the outer membrane channel of the MexEF efflux pump from Pseudomonas aeruginosa...
2017: PloS One
Anupama Lakshmanan, George J Lu, Arash Farhadi, Suchita P Nety, Martin Kunth, Audrey Lee-Gosselin, David Maresca, Raymond W Bourdeau, Melissa Yin, Judy Yan, Christopher Witte, Dina Malounda, F Stuart Foster, Leif Schröder, Mikhail G Shapiro
Gas vesicles (GVs) are a unique class of gas-filled protein nanostructures that are detectable at subnanomolar concentrations and whose physical properties allow them to serve as highly sensitive imaging agents for ultrasound and MRI. Here we provide a protocol for isolating GVs from native and heterologous host organisms, functionalizing these nanostructures with moieties for targeting and fluorescence, characterizing their biophysical properties and imaging them using ultrasound and MRI. GVs can be isolated from natural cyanobacterial and haloarchaeal host organisms or from Escherichia coli expressing a heterologous GV gene cluster and purified using buoyancy-assisted techniques...
October 2017: Nature Protocols
Sidi Huang, Venkata Sharat Parimi, Sili Deng, Srilakshmi Lingamneni, Xiaolin Zheng
Silicon (Si) particles are widely utilized as high-capacity electrodes for Li-ion batteries, elements for thermoelectric devices, agents for bio-imaging and therapy, and many other applications. However, Si particles can ignite and burn in air at elevated temperatures or under intense illumination. This poses potential safety hazards when handling, storing, and utilizing these particles for those applications. In order to avoid the problem of accidental ignition, it is critical to quantify the ignition properties of Si particles as functions of their sizes and porosities...
September 5, 2017: Nano Letters
Sarah Devroe, Roselien Meeusen, Marc Gewillig, Bjorn Cools, Koen Poesen, Robert Sanders, Steffen Rex
BACKGROUND: Xenon has repeatedly been demonstrated to have only minimal hemodynamic side effects when compared to other anesthetics. Moreover, in experimental models, xenon was found to be neuroprotective and devoid of developmental neurotoxicity. These properties could render xenon attractive for the anesthesia in neonates and infants with congenital heart disease. However, experience with xenon anesthesia in children is scarce. AIMS: We hypothesized that in children undergoing cardiac catheterization, general anesthesia with a combination of sevoflurane with xenon results in superior hemodynamic stability, compared to sevoflurane alone...
September 5, 2017: Paediatric Anaesthesia
Hailin Zhao, Rolf Rossaint, Mark Coburn, Daqin Ma
No abstract text is available yet for this article.
October 2017: European Journal of Anaesthesiology
Jan Hofland, Alexandre Ouattara, Jean-Luc Fellahi, Matthias Gruenewald, Jean Hazebroucq, Claude Ecoffey, Pierre Joseph, Matthias Heringlake, Annick Steib, Mark Coburn, Julien Amour, Bertrand Rozec, Inge de Liefde, Patrick Meybohm, Benedikt Preckel, Jean-Luc Hanouz, Luigi Tritapepe, Peter Tonner, Hamina Benhaoua, Jan Patrick Roesner, Berthold Bein, Luc Hanouz, Rob Tenbrinck, Ad J J C Bogers, Bert G Mik, Alain Coiffic, Jochen Renner, Markus Steinfath, Helga Francksen, Ole Broch, Assad Haneya, Manuella Schaller, Patrick Guinet, Lauren Daviet, Corinne Brianchon, Sebastien Rosier, Jean-Jacques Lehot, Hauke Paarmann, Julika Schön, Thorsten Hanke, Joachym Ettel, Silke Olsson, Stefan Klotz, Amir Samet, Giedrius Laurinenas, Adrien Thibaud, Mircea Cristinar, Olivier Collanges, François Levy, Rolf Rossaint, Ana Stevanovic, Gereon Schaelte, Christian Stoppe, Nora Ait Hamou, Sarah Hariri, Astrid Quessard, Aude Carillion, Hélène Morin, Jacqueline Silleran, David Robert, Anne-Sophie Crouzet, Kai Zacharowski, Christian Reyher, Sonja Iken, Nina C Weber, Marcus Hollmann, Susanne Eberl, Giovanni Carriero, Daria Collacchi, Alessandra Di Persio, Olivier Fourcade, Stefan Bergt, Angela Alms
BACKGROUND: Ischemic myocardial damage accompanying coronary artery bypass graft surgery remains a clinical challenge. We investigated whether xenon anesthesia could limit myocardial damage in coronary artery bypass graft surgery patients, as has been reported for animal ischemia models. METHODS: In 17 university hospitals in France, Germany, Italy, and The Netherlands, low-risk elective, on-pump coronary artery bypass graft surgery patients were randomized to receive xenon, sevoflurane, or propofol-based total intravenous anesthesia for anesthesia maintenance...
September 5, 2017: Anesthesiology
Yannick Le Manach, Serena Sibilio, Richard Whitlock
No abstract text is available yet for this article.
September 5, 2017: Anesthesiology
Victor Balashov, Maria Cherkasova, Kirill Kruglov, Arseny Kudriavtsev, Pavel Masherov, Andrey Mogulkin, Vladimir Obukhov, Valentin Riaby, Victoria Svotina
A theoretical-experimental research has been carried out to determine the characteristics of a radio frequency (RF) ion source for the generation of a weakly expanding wedge-shaped xenon ion beam. Such ion beam geometry is of interest as a prototype of an on-board ion injector for contactless "ion shepherding" by service spacecraft to remove large space debris objects from geostationary orbits. The wedge shape of the ion beam increases its range. The device described herein comprises an inductive gas discharge chamber and a slit-type three-electrode ion extraction grid (IEG) unit...
August 2017: Review of Scientific Instruments
Huijong Han, Petri Kursula
We present datasets that can be used for the experimental phasing of crystal structures of two myelin proteins. The structures were recently described in the articles "Periaxin and AHNAK nucleoprotein 2 form intertwined homodimers through domain swapping" (H. Han, P. Kursula, 2014) [1] and "The olfactomedin domain from gliomedin is a β-propeller with unique structural properties" (H. Han, P. Kursula, 2015) [2]. Crystals of periaxin were derivatized with tungsten and xenon prior to data collection, and diffraction data for these crystals are reported at 3 and 1 wavelengths, respectively...
April 2017: Data in Brief
Madhwesha R Rao, Neil J Stewart, Paul D Griffiths, Graham Norquay, Jim M Wild
Purpose To evaluate the feasibility of directly imaging perfusion of human brain tissue by using magnetic resonance (MR) imaging with inhaled hyperpolarized xenon 129 ((129)Xe). Materials and Methods In vivo imaging with (129)Xe was performed in three healthy participants. The combination of a high-yield spin-exchange optical pumping (129)Xe polarizer, custom-built radiofrequency coils, and an optimized gradient-echo MR imaging protocol was used to achieve signal sensitivity sufficient to directly image hyperpolarized (129)Xe dissolved in the human brain...
August 31, 2017: Radiology
Yu Cai, Pingping Liang, Qianyun Tang, Weili Si, Peng Chen, Qi Zhang, Xiaochen Dong
For synergistic cancer therapy, it is highly desirable to devise a single multifunctional agent to combine photodynamic therapy (PDT), photothermal therapy (PTT), and chemotherapy, which is soluble and excitable at low irradiation, as well as able to selectively target tumors and achieve high efficacy. Toward this ambition, here the chemotherapy drugs chlorambucil (Cb), and all trans retinoic acid (ATRA) are covalently conjugated onto a small dye molecule diketopyrrolopyrrole (DPP-Cb and DPP-ATRA). The soluble nanoparticles (NPs) of DPP-Cb and DPP-ATRA formed by reprecipitation can selectively accumulate in tumors, release chemotherapy drugs under acidic conditions, and exhibit efficient reactive oxygen species (ROS) generation and photothermal conversion under the irradiation of a low power xenon lamp (40 mW/cm(2))...
September 13, 2017: ACS Applied Materials & Interfaces
Mu Jin, Yi Cheng, Yanwei Yang, Xudong Pan, Jiakai Lu, Weiping Cheng
OBJECTIVES: The available evidence shows that hypoxemia after Stanford Type-A acute aortic dissection (AAD) surgery is a frequent cause of several adverse consequences. The pathogenesis of postoperative hypoxemia after AAD surgery is complex, and ischemia/reperfusion and inflammation are likely to be underlying risk factors. Xenon, recognized as an ideal anesthetic and anti-inflammatory treatment, might be a possible treatment for these adverse effects. METHODS/DESIGN: The trial is a prospective, double-blind, 4-group, parallel, randomized controlled, a signal-center clinical trial...
August 2017: Medicine (Baltimore)
E Mari, P Berthault
Xenon is a first-rate sensor of biological events owing to its large polarizable electron cloud, which induces significant modifications to NMR parameters in response to slight changes in its local environment. The use of xenon as a sensor is of increasing interest for sensitive magnetic resonance imaging, because its signal can be enhanced by several orders of magnitude, mainly by spin-exchange optical pumping. Furthermore, xenon can be vectorized toward targets of interest by using functionalized host systems, which enables their detection at sub-nanomolar concentrations...
August 23, 2017: Analyst
Pieter De Meutter, Johan Camps, Andy Delcloo, Piet Termonia
On 6 January 2016, the Democratic People's Republic of Korea announced to have conducted its fourth nuclear test. Analysis of the corresponding seismic waves from the Punggye-ri nuclear test site showed indeed that an underground man-made explosion took place, although the nuclear origin of the explosion needs confirmation. Seven weeks after the announced nuclear test, radioactive xenon was observed in Japan by a noble gas measurement station of the International Monitoring System. In this paper, atmospheric transport modelling is used to show that the measured radioactive xenon is compatible with a delayed release from the Punggye-ri nuclear test site...
August 18, 2017: Scientific Reports
Derek A Haas, Paul W Eslinger, Theodore W Bowyer, Ian M Cameron, James C Hayes, Justin D Lowrey, Harry S Miley
The Comprehensive Nuclear-Test-Ban Treaty bans all nuclear tests and mandates development of verification measures to detect treaty violations. One verification measure is detection of radioactive xenon isotopes produced in the fission of actinides. The International Monitoring System (IMS) currently deploys automated radioxenon systems that can detect four radioxenon isotopes. Radioxenon systems with lower detection limits are currently in development. Historically, the sensitivity of radioxenon systems was measured by the minimum detectable concentration for each isotope...
August 14, 2017: Journal of Environmental Radioactivity
Marwa Abid, Soraa Bouattour, Ana M Ferraria, David S Conceição, Ana P Carapeto, Luís F Vieira Ferreira, Ana M Botelho do Rego, Mohamed M Chehimi, Manuel Rei Vilar, Sami Boufi
In the present work, a simple, reliable and cost-effective approach to functionalize cotton fabrics with Ag-TiO2 nanoparticles strongly bound to the fibres and with visible-light-responsive photo-activity is presented. The hybrid cotton-Ag-TiO2 fabrics were characterized by Raman, AFM, FE-SEM, TGA, XPS GSDR, and LIL to confirm the generation of metallic Ag nanoparticles and crystalline TiO2 and investigate how the concentration of Ag and TiO2 precursors affected the morphology and the luminescence properties of the nanostructured layer grafted on the cotton fibres...
July 29, 2017: Journal of Colloid and Interface Science
Mitsuru Honda, Ryo Ichibayashi, Ginga Suzuki, Hiroki Yokomuro, Yoshikatsu Seiki, Shigeru Sase, Taichi Kishi
BACKGROUND: Monitoring of intracranial pressure (ICP) is considered to be fundamental for the care of patients with severe traumatic brain injury (TBI) and is routinely used to direct medical and surgical therapy. Accordingly, some guidelines for the management of severe TBI recommend that treatment be initiated for ICP values >20 mmHg. However, it remained to be accounted whether there is a scientific basis to this instruction. The purpose of the present study was to clarify whether the basis of ICP values >20 mmHg is appropriate...
July 31, 2017: Neurocritical Care
Shigeru Sase, Homaro Yamamoto, Ena Kawashima, Xin Tan, Yutaka Sawa
BACKGROUND: Quantitative cerebral blood flow (CBF) measurement is expected to help early detection of functional abnormalities caused by Alzheimer's disease (AD) and enable AD treatment to begin in its early stages. Recently, a technique of layer analysis was reported that allowed CBF to be analyzed from the outer to inner layers of the brain. The aim of this work was to develop methods for discriminating between patients with mild AD and healthy subjects based on CBF images of the lateral views created with the layer analysis technique in xenon-enhanced computed tomography...
July 26, 2017: Psychogeriatrics: the Official Journal of the Japanese Psychogeriatric Society
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