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https://www.readbyqxmd.com/read/28648106/pressure-autoregulation-measurement-techniques-in-adult-tbi-part-i-a-scoping-review-of-intermittent-semi-intermittent-methods
#1
Frederick Adam Zeiler, Joseph Donnelly, Leanne Calviello, David Menon, Peter Smieleweski, Marek Czosnyka
To perform a systematic, scoping review of commonly described intermittent/semi-intermittent autoregulation measurement techniques in adult TBI. Nine separate systematic reviews were conducted for each intermittent technique: Computed tomographic perfusion (CTP)/Xenon-CT (Xe-CT), positron emission tomography (PET), magnetic resonance imaging (MRI), arterio-venous difference in oxygen (AVDO2) technique, thigh cuff deflation technique (TCDT), transient hyperemic response test (THRT), orthostatic hypotension test (OHT), mean flow index (Mx) and transfer function ARI (TF-ARI)...
June 24, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28644643/first-demonstration-of-a-scintillating-xenon-bubble-chamber-for-detecting-dark-matter-and-coherent-elastic-neutrino-nucleus-scattering
#2
D Baxter, C J Chen, M Crisler, T Cwiok, C E Dahl, A Grimsted, J Gupta, M Jin, R Puig, D Temples, J Zhang
A 30-g xenon bubble chamber, operated at Northwestern University in June and November 2016, has for the first time observed simultaneous bubble nucleation and scintillation by nuclear recoils in a superheated liquid. This chamber is instrumented with a CCD camera for near-IR bubble imaging, a solar-blind photomultiplier tube to detect 175-nm xenon scintillation light, and a piezoelectric acoustic transducer to detect the ultrasonic emission from a growing bubble. The time of nucleation determined from the acoustic signal is used to correlate specific scintillation pulses with bubble-nucleating events...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28636798/a-ccpe-based-xenon-biosensor-for-magnetic-resonance-imaging-of-claudin-expressing-cells
#3
Anna Piontek, Christopher Witte, Honor May Rose, Miriam Eichner, Jonas Protze, Gerd Krause, Jörg Piontek, Leif Schröder
The majority of malignant tumors originate from epithelial cells, and many of them are characterized by an overexpression of claudins (Cldns) and their mislocalization out of tight junctions. We utilized the C-terminal claudin-binding domain of Clostridium perfringens enterotoxin (cCPE), with its high affinity to specific members of the claudin family, as the targeting unit for a claudin-sensitive cancer biosensor. To overcome the poor sensitivity of conventional relaxivity-based magnetic resonance imaging (MRI) contrast agents, we utilized the superior sensitivity of xenon Hyper-CEST biosensors...
June 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28612499/xenon-recovery-at-room-temperature-using-metal-organic-frameworks
#4
Praveen Thallapally, Sameh K Elsaidi, Daniele Ongari, Wenqian Xu, Mona H Mohamed, Maciej Haranczyk
Xenon is known to be a very efficient anesthetic gas but its cost prohibits the wider use in medical industry and other potential applications. It has been shown that Xe recovery and recycle from anesthetic gas mixture can significantly reduce its cost as anesthetic. The current technology uses series of adsorbent columns followed by low temperature distillation to recover Xe, which is expensive to use in medical facilities. Herein, we propose a much simpler and more efficient system to recover and recycle Xe from exhale anesthetic gas mixture at room temperature using metal organic frameworks...
June 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28610592/xenon-in-the-treatment-of-panic-disorder-an-open-label-study
#5
Alexander Dobrovolsky, Thomas E Ichim, Daqing Ma, Santosh Kesari, Vladimir Bogin
BACKGROUND: Current treatments of panic disorder (PD) are limited by adverse effects, poor efficacy, and need for chronic administration. The established safety profile of subanesthetic concentrations of xenon gas, which is known to act as a glutamate subtype NMDA receptor antagonist, coupled with preclinical studies demonstrating its effects in other anxiety related conditions, prompted us to evaluate its feasibility and efficacy in treatment of patients with PD. METHODS: An open-label clinical trial of xenon-oxygen mixture was conducted in 81 patients with PD; group 1 consisting of patients only with PD (N = 42); and group 2 patients with PD and other comorbidities (N = 39)...
June 13, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28609184/use-of-gases-in-dairy-manufacturing-a-review
#6
Bhaskar Mani Adhikari, Tuyen Truong, Nidhi Bansal, Bhesh Bhandari
Use of gases (air, carbon dioxide and nitrogen) has been practiced in the manufacture of dairy products (i.e. ice cream, whipped cream and butter) to improve their texture, mouthfeel and shelf-life extension. Many attempts have also been made to incorporate other gases such as hydrogen, nitrous oxide, argon, xenon, and helium into the dairy systems for various product functionalities such as whipping, foaming, texture, aroma enhancement and therapeutic properties. The gases can be dissolved in aqueous and fat phases or remain in the form of bubbles stabilised by protein or fat particles...
June 13, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28608900/theoretical-and-experimental-studies-on-three-water-stable-isostructural-paddlewheel-based-semiconducting-metal-organic-frameworks
#7
Xiaowei Yang, Yuan Zhang, Feng Li, Tiantian Guo, Yong Wu, Fengyan Jin, Min Fang, Yaqian Lan, Yafei Li, Yong Zhou, Zhigang Zou
Three water-stable isostructural metal-organic frameworks (MOFs) of the general formula [M2(TCS)(BPY)] (M = Co(1), Ni(2) and Cu(3); H4TCS = tetrakis(4-carboxyphenyl) silane, BPY = 4,4'-bipyridine) were synthesized and fully characterized. MOFs 1-3 are stable in pH = 5-11, 2-11, 3-11 aqueous solution respectively for at least 24 h at room temperature. Although H4TCS absorbs only UV light, MOFs 1-3 absorb both UV and visible light in broad ranges (250-800 nm) and absorb more visible light than the ligand BPY...
June 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28605574/selection-of-a-single-isotope-of-multiply-charged-xenon-a-xe-z-a-128-136-z-1-6-by-using-a-bradbury-nielsen-ion-gate
#8
Akihiro Kitashoji, Taiki Yoshikawa, Akimasa Fujihara, Takaaki Kamamori, Shigeki Nashima, Tomoyuki Yatsuhashi
The inclusion of an ion gate in a tandem mass spectrometer allows a specific precursor ion to be selected, and the fragment ions are then used for structure analysis and to investigate chemical reactions. However, the performance of an ion gate has been judged simply by whether or not the target ion was selected. In this study, we designed, manufactured, constructed, and characterized a Bradbury-Nielsen ion gate (BNG). The actual ion selection ability, i.e. the gate function, of the BNG was measured for isotopes of Xe(z+) (z=1-6)...
June 12, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28602025/a-method-to-assess-the-protective-efficacy-of-sunscreens-against-visible-light-induced-pigmentation
#9
L Duteil, J Esdaile, Y Maubert, A Cathelineau, A Bouloc, C Queille-Roussel, T Passeron
BACKGROUND: Until now, photoprotection of human skin has involved the development of sunscreens effective in the ultraviolet (UV) domain. During the last ten years several studies have shown that besides the well-known damaging effects of UV, visible (400-700nm) and even infrared light (> 700 nm) can induce damage which contributes to photoaging. Furthermore, many photodermatoses are also known to be triggered by visible light (VL). OBJECTIVE/ METHOD: An in vivo method is proposed to assess the protective efficacy of sunscreens in the VL domain...
June 11, 2017: Photodermatology, Photoimmunology & Photomedicine
https://www.readbyqxmd.com/read/28600568/an-aromatic-noble-gas-hydride-c6h5ccxeh
#10
Luís Duarte, Leonid Khriachtchev
We report on the aromatic noble-gas hydride, C6H5CCXeH, identified in a xenon matrix using infrared spectroscopy and extensive quantum chemical calculations. This molecule is prepared by 250-nm photolysis of phenylacetylene (C6H5CCH) isolated in a xenon matrix and subsequent thermal mobilization of hydrogen atoms at about 40 K. The characteristic H-Xe stretching mode of C6H5CCXeH is observed at about 1500 cm(-1), and a number of other fundamentals also appear in the experimental spectra. The assignment is supported by deuteration experiments providing predictable shifts of the vibrational frequencies...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28598913/xenon-as-an-adjuvant-to-propofol-anesthesia-in-patients-undergoing-off-pump-coronary-artery-bypass-graft-surgery-a-pragmatic-randomized-controlled-clinical-trial
#11
Layth Al Tmimi, Sarah Devroe, Geertrui Dewinter, Marc Van de Velde, Gert Poortmans, Bart Meyns, Bart Meuris, Mark Coburn, Steffen Rex
BACKGROUND: Xenon was shown to cause less hemodynamic instability and reduce vasopressor needs during off-pump coronary artery bypass (OPCAB) surgery when compared with conventionally used anesthetics. As xenon exerts its organ protective properties even in subanesthetic concentrations, we hypothesized that in patients undergoing OPCAB surgery, 30% xenon added to general anesthesia with propofol results in superior hemodynamic stability when compared to anesthesia with propofol alone...
June 8, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28596949/new-methodologies-for-the-preparation-of-carbon-11-labeled-radiopharmaceuticals
#12
REVIEW
Kenneth Dahl, Christer Halldin, Magnus Schou
PURPOSE: This short review aims to cover the more recent and promising developments of carbon-11 ((11)C) labeling radiochemistry and its utility in the production of novel radiopharmaceuticals, with special emphasis on methods that have the greatest potential to be translated for clinical positron emission tomography (PET) imaging. METHODS: A survey of the literature was undertaken to identify articles focusing on methodological development in (11)C chemistry and their use within novel radiopharmaceutical preparation...
2017: Clinical and Translational Imaging: Reviews in Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28596364/xenon-isotopes-in-67p-churyumov-gerasimenko-show-that-comets-contributed-to-earth-s-atmosphere
#13
B Marty, K Altwegg, H Balsiger, A Bar-Nun, D V Bekaert, J-J Berthelier, A Bieler, C Briois, U Calmonte, M Combi, J De Keyser, B Fiethe, S A Fuselier, S Gasc, T I Gombosi, K C Hansen, M Hässig, A Jäckel, E Kopp, A Korth, L Le Roy, U Mall, O Mousis, T Owen, H Rème, M Rubin, T Sémon, C-Y Tzou, J H Waite, P Wurz
The origin of cometary matter and the potential contribution of comets to inner-planet atmospheres are long-standing problems. During a series of dedicated low-altitude orbits, the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) on the Rosetta spacecraft analyzed the isotopes of xenon in the coma of comet 67P/Churyumov-Gerasimenko. The xenon isotopic composition shows deficits in heavy xenon isotopes and matches that of a primordial atmospheric component. The present-day Earth atmosphere contains 22 ± 5% cometary xenon, in addition to chondritic (or solar) xenon...
June 9, 2017: Science
https://www.readbyqxmd.com/read/28579371/influence-of-argon-on-temperature-modulation-and-neurological-outcome-in-hypothermia-treated-rats-following-cardiac-arrest
#14
Anne Brücken, Christian Bleilevens, Philipp Föhr, Kay Nolte, Rolf Rossaint, Gernot Marx, Michael Fries, Matthias Derwall
AIM OF THE STUDY: Combining xenon and mild therapeutic hypothermia (MTH) after cardiac arrest (CA) confers a degree of protection that is greater than either of the two interventions alone. However, xenon is very costly which might preclude a widespread use. We investigated whether the inexpensive gas argon would enhance hypothermia induced neurologic recovery in a similar manner. METHODS: Following nine minutes of CA and three minutes of cardiopulmonary resuscitation 21 male Sprague-Dawley rats were randomized to receive MTH (33°C for 6h), MTH plus argon (70% for 1h), or no treatment...
June 1, 2017: Resuscitation
https://www.readbyqxmd.com/read/28578722/a-comprehensive-approach-towards-optimizing-the-xenon-plasma-focused-ion-beam-instrument-for-semiconductor-failure-analysis-applications
#15
Srinivas Subramaniam, Jennifer Huening, John Richards, Kevin Johnson
The xenon plasma focused ion beam instrument (PFIB), holds significant promise in expanding the applications of focused ion beams in new technology thrust areas. In this paper, we have explored the operational characteristics of a Tescan FERA3 XMH PFIB instrument with the aim of meeting current and future challenges in the semiconductor industry. A two part approach, with the first part aimed at optimizing the ion column and the second optimizing specimen preparation, has been undertaken. Detailed studies characterizing the ion column, optimizing for high-current/high mill rate activities, have been described to support a better understanding of the PFIB...
June 5, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28574309/early-low-cerebral-blood-flow-and-high-cerebral-lactate-prediction-of-delayed-cerebral-ischemia-in-subarachnoid-hemorrhage
#16
Elham Rostami, Henrik Engquist, Timothy Howells, Ulf Johnson, Elisabeth Ronne-Engström, Pelle Nilsson, Lars Hillered, Anders Lewén, Per Enblad
OBJECTIVE Delayed cerebral ischemia (DCI) following subarachnoid hemorrhage (SAH) is one of the major contributors to poor outcome. It is crucial to be able to detect early signs of DCI to prevent its occurrence. The objective of this study was to determine if low cerebral blood flow (CBF) measurements and pathological microdialysis parameters measured at the bedside can be observed early in patients with SAH who later developed DCI. METHODS The authors included 30 patients with severe SAH. The CBF measurements were performed at Day 0-3 after disease onset, using bedside xenon-CT...
June 2, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28571263/the-effect-of-accelerated-aging-on-the-colour-stability-of-composite-resin-luting-cements-using-different-bonding-techniques
#17
Satheesh B Haralur, Mohammed Alfaifi, Abdulmajeed Almuaddi, Mazen Al-Yazeedi, Abdulmajeed Al-Ahmari
INTRODUCTION: The main criterion of successful aesthetic restoration is to match the colour of the adjacent teeth. Porcelain laminate veneer is widely practiced indirect restoration in the contemporary aesthetic dentistry. The underlying luting cement colour influences the final outcome of the thin, translucent veneer shade. Hence, colour stability of luting cement is important criteria during their selection. AIM: The objective of the study was to assess the colour stability of the different dentin bonding techniques in composite resin luting cements...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28560843/superelectrophilic-behavior-of-an-anion-demonstrated-by-the-spontaneous-binding-of-noble-gases-to-b12-cl11
#18
Markus Rohdenburg, Martin Mayer, Max Grellmann, Carsten Jenne, Tobias Borrmann, Florian Kleemiss, Vladimir A Azov, Knut R Asmis, Simon Grabowsky, Jonas Warneke
It is common and chemically intuitive to assign cations electrophilic and anions nucleophilic reactivity, respectively. Herein, we demonstrate a striking violation of this concept: The anion [B12 Cl11 ](-) spontaneously binds to the noble gases (Ngs) xenon and krypton at room temperature in a reaction that is typical of "superelectrophilic" dications. [B12 Cl11 Ng](-) adducts, with Ng binding energies of 80 to 100 kJ mol(-1) , contain B-Ng bonds with a substantial degree of covalent interaction. The electrophilic nature of the [B12 Cl11 ](-) anion is confirmed spectroscopically by the observation of a blue shift of the CO stretching mode in the IR spectrum of [B12 Cl11 CO](-) and theoretically by investigation of its electronic structure...
June 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28555216/gas-vapour-separation-using-ultra-microporous-metal-organic-frameworks-insights-into-the-structure-separation-relationship
#19
REVIEW
Karim Adil, Youssef Belmabkhout, Renjith S Pillai, Amandine Cadiau, Prashant M Bhatt, Ayalew H Assen, Guillaume Maurin, Mohamed Eddaoudi
The separation of related molecules with similar physical/chemical properties is of prime industrial importance and practically entails a substantial energy penalty, typically necessitating the operation of energy-demanding low temperature fractional distillation techniques. Certainly research efforts, in academia and industry alike, are ongoing with the main aim to develop advanced functional porous materials to be adopted as adsorbents for the effective and energy-efficient separation of various important commodities...
June 6, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28553184/initial-experience-in-the-use-of-technetium-99-metastable-hydroxymethylene-diphosphonate-as-an-alternative-ventilation-agent-during-periods-of-interim-shortage
#20
Colin Raymond Young, Kalpna Prasad
Sporadic supply interruptions of select radiopharmaceuticals on the global market require consideration of alternative agents to support continuity of essential nuclear medicine examinations. During an acute shortage of Xenon-133 and technetium-99 metastable (Tc-99m) diethylene-triamine-pentaacetate (DTPA), our institution used aerosolized Tc-99m hydroxymethylene diphosphonate (HDP), a radiopharmaceutical traditionally used in bone scintigraphy, in lieu of traditional ventilation agents, for two cases of suspected pulmonary embolism...
April 2017: World Journal of Nuclear Medicine
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