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Piyali Sarkar, Arup Biswas, Rajnarayan De, K Divakar Rao, Subir Ghosh, M H Modi, Siju John, H C Barshilia, Dibyendu Bhattacharyya, Naba Kishor Sahoo
The DC magnetron sputter grown Co/Ti multilayers, with ultra-low bi-layer thicknesses and with Co layers deposited under mixed ambience of argon and dry air, have been investigated for use in the water window soft x-ray regime of 23-44 Å. Initially, deposition parameters have been optimized for obtaining smooth and continuous low thickness Co and Ti single-layer films, and, then, multilayers with five bi-layers of various bi-layer thicknesses were deposited. The samples have been primarily characterized by the grazing incidence x-ray reflectivity (GIXR) measurements with a hard x-ray laboratory source...
September 20, 2017: Applied Optics
M Polke, J Oelmann-Avendano, A Warth, C P Heussel, F J F Herth, R Eberhardt
BACKGROUND: Benign central airway tumors are very rare diseases. Their unspecific symptoms are responsible for late diagnosis. Endoscopic interventions with different techniques and tools are widely used for their treatment. However, in certain cases interventional endoscopy might be unsuccessful and therefore other methods such as high-dose-rate brachytherapy could be a therapeutic option. CASE PRESENTATION: A 76-year-old white German woman was referred to our clinic for an endoscopic treatment of a recurrent granulation polyp in her left main bronchus...
October 18, 2017: Journal of Medical Case Reports
Joshua D Dowell, Dominic Semaan, Mina S Makary, John Ryu, Mamdouh Khayat, Xueliang Pan
OBJECTIVE: The purpose of this study was to compare the retrieval characteristics of the Option Elite (Argon Medical, Plano, Tex) and Denali (Bard, Tempe, Ariz) retrievable inferior vena cava filters (IVCFs), two filters that share a similar conical design. METHODS: A single-center, retrospective study reviewed all Option and Denali IVCF removals during a 36-month period. Attempted retrievals were classified as advanced if the routine "snare and sheath" technique was initially unsuccessful despite multiple attempts or an alternative endovascular maneuver or access site was used...
November 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
J Jones, K Richter, T J Price, A J Ross, P Crozet, C Faust, R F Malenda, S Carlus, A P Hickman, J Huennekens
We report measurements of rate coefficients at T ≈ 600 K for rotationally inelastic collisions of NaK molecules in the 2(A)(1)Σ(+) electronic state with helium, argon, and potassium atom perturbers. Several initial rotational levels J between 14 and 44 were investigated. Collisions involving molecules in low-lying vibrational levels (v = 0, 1, and 2) of the 2(A)(1)Σ(+) state were studied using Fourier-transform spectroscopy. Collisions involving molecules in a higher vibrational level, v = 16, were studied using pump/probe, optical-optical double resonance spectroscopy...
October 14, 2017: Journal of Chemical Physics
El Mostafa Benchafia, Zhenhua Yao, Gu Yuan, Tsengmin Chou, Hong Piao, Xianqin Wang, Zafar Iqbal
The long-sought cubic gauche phase of polymeric nitrogen (cg-PN) with nitrogen-nitrogen single bonds has been synthesized together with a related phase by a radio-frequency plasma reaction under near-ambient conditions. Here, we report the synthesis of polymeric nitrogen using a mixture of nitrogen and argon flowing over bulk β-sodium azide or β-sodium azide dispersed on 100 nm long multiwall carbon nanotubes. The cg-PN phase is identified by Raman and attenuated total reflection-Fourier transform infrared spectroscopy, and powder X-ray diffraction...
October 13, 2017: Nature Communications
Ekaterina D Sormacheva, Peter S Sherin, Yuri P Tsentalovich
Photoinduced generation of radicals in the eye lens may play an important role in the modification of proteins, leading to their coloration, aggregation, and insolubilization. The radicals can be formed via the reactions of photoexcited endogenous chromophores of the human lens with lens proteins, in particular with tryptophan residues. In the present work we studied the reactions induced by UV-A (315-400nm) light between kynurenic acid (KNA), an effective photosensitizer present in the lens, and N-acetyl-L-tryptophan (NTrpH) under aerobic and anaerobic conditions...
October 9, 2017: Free Radical Biology & Medicine
Wen Chong Song, Wei Wei Lv, Xiao Zhong Gao
The aim of this study was to analyze the location, the cause and treatment of iatrogenic gastrointestinal perforations following therapeutic endoscopic procedures. Perforation occurred in 12 patients out of 3,389, giving cases occurred intraoperatively or postoperatively. Among them, 6 cases were closed by titanium clipping and 1 case by purse string suture. In another case after cap-assisted endoscopic mucosal resection (EMRC), attempted titanium clipping failed, emergency surgery had to be performed. One each case, after Argon plasma coagulation (APC) and case after endoscopic piecemeal mucosal resection (EPMR), recovered well spontaneously...
September 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
Irem Damar Huner, Haci Ali Gulec
The aim of the study was to investigate the effects of hydrophilic surface modification via atmospheric pressure jet plasma (ApJPls) on the fouling propensity of polyethersulfone (PES) ultrafiltration (UF) membranes during concentration of whey proteins. The distance from nozzle to substrate surface of 30mm and the exposure period of 5 times were determined as the most effective parameters enabling an increase in ΔGiwi value of the plain membrane from (-) 14.92±0.89mJ/m(2) to (+) 17.57±0.67mJ/m(2). Maximum hydrophilicity and minimum surface roughness achieved by argon plasma action resulted in better antifouling behavior, while the hydraulic permeability and the initial permeate flux were decreased sharply due to the plasma-induced surface cross-linking...
October 3, 2017: Colloids and Surfaces. B, Biointerfaces
Andrey A Bezrukov, Pascal D C Dietzel
The metal-organic framework [Y(tbpp)]·nDMF (1) was synthesized from yttrium(III) nitrate and the tritopic linker tris(4'-carboxy[1,1'-biphenyl]-4-yl)phosphine (H3tbpp). The distance between the coordinating atoms of the carboxylate groups of the extended tridentate phosphine linker is more than 1.8 nm, resulting in an average pore dimension of 0.9 nm in the noninterpenetrated metal-organic framework. The material exhibits high thermal stability and permanent porosity after removal of guest molecules from the one-dimensional pore system...
October 9, 2017: Inorganic Chemistry
Jiaye Jin, Wei Li, Yuhong Liu, Guanjun Wang, Mingfei Zhou
The cation complexes [ArB3O4](+), [ArB3O5](+), [ArB4O6](+) and [ArB5O7](+) were prepared via a laser vaporization supersonic ion source in the gas phase. Their vibrational spectra were measured via mass-selected infrared photodissociation spectroscopy. Spectroscopy combined with quantum chemical calculations revealed that the [ArB3O5](+), [ArB4O6](+) and [ArB5O7](+) cation complexes have planar structures each involving an aromatic boroxol ring and an argon-boron covalent bond. In contrast, the [ArB3O4](+) cation is characterized to be a weakly bound complex with a B3O4(+) chain structure...
September 1, 2017: Chemical Science
Elaine J Redmond, Katelyn S Dolbec, Aisling S Fawaz, Hugh D Flood, Subhasis K Giri
INTRODUCTION: Treatment options for prostate cancer (PCa) include radical radiotherapy (RT) and radical prostatectomy, both of which have comparable oncological outcomes. The aim of this study was to investigate the hospital burden of long-term genitourinary and gastrointestinal toxicity among patients with PCa who were treated with radiotherapy at our institution. METHODS: The radiotherapy department database was used retrospectively to identify all patients who underwent radiotherapy for PCa from January 2006 to January 2008...
October 4, 2017: Surgeon: Journal of the Royal Colleges of Surgeons of Edinburgh and Ireland
O Ozgurel, F Pauzat, J Pilmé, Y Ellinger, M-C Bacchus-Montabonel, O Mousis
The deficiencies of argon, krypton, and xenon observed in the atmosphere of Titan as well as anticipated in some comets might be related to a scenario of sequestration by H3(+) in the gas phase at the early evolution of the solar nebula. The chemical process implied is a radiative association, evaluated as rather efficient in the case of H3(+), especially for krypton and xenon. This mechanism of chemical trapping might not be limited to H3(+) only, considering that the protonated ions produced in the destruction of H3(+) by its main competitors present in the primitive nebula, i...
October 7, 2017: Journal of Chemical Physics
Stephanie F Smith, Thomas Adams, Sarah A Hosgood, Michael L Nicholson
BACKGROUND: Argon has shown potential as an organoprotective agent in numerous models of ischemia-reperfusion injury (IRI). The aim of this study was to evaluate the effects of argon gas during ex vivo normothermic perfusion (EVNP) in an experimental porcine model of kidney IRI. MATERIALS AND METHODS: After a warm ischemia time of 15 min and 17 h of static cold storage, porcine kidneys underwent 1 h of EVNP using leukocyte-depleted blood. During EVNP, kidneys were perfused with a gas composition either of 70% argon (n = 6), 70% nitrogen control (n = 6), or standard 95% oxygen (n = 6) balanced with 5% carbon dioxide...
October 2017: Journal of Surgical Research
Güldal Esendağlı, F Göknur Akarca, Serdar Balcı, Asuman Argon, Selma Şengiz Erhan, Nesrin Turhan, Neslihan İnce Zengin, Sevinç Hallaç Keser, Betül Çelik, Tangül Bulut, Samir Abdullazade, Esra Erden, Berna Savaş, Temmuz Bostan, Özgül Sağol, Anıl Aysal Ağalar, Nuray Kepil, Yıldırım Karslıoğlu, Armağan Günal, Fatma Markoç, Burcu Saka, Gonca Özgün, Şükrü Oğuz Özdamar, Burak Bahadır, Esin Kaymaz, Emre Işık, Semin Ayhan, Deniz Tunçel, Banu Özgüven Yılmaz, Sevinç Çelik, Tuba Karabacak, İpek Erbarut Seven, Çiğdem Ataizi Çelikel, Zuhal Gücin, Özgür Ekinci, Gülen Akyol
OBJECTIVE: As there is continuing disagreement among the observers on the differential diagnosis between the epithelial changes/lesions and neoplasms of the gallbladder, this multicentre study was planned in order to assess the rate of the epithelial gallbladder lesions in Turkey and to propose microscopy and macroscopy protocols. MATERIAL AND METHOD: With the participation of 22 institutions around Turkey that were included in the Hepato-Pancreato-Biliary Study Group, 89,324 cholecystectomy specimens sampled from 2003 to 2016 were retrospectively evaluated...
October 6, 2017: Türk Patoloji Dergisi
Abhilash Perisetti, Nayana George, Saikiran Raghavapuram, Abu Baker Sheikh, Mohit Girotra, Benjamin Tharian
A 47-year-old patient presented from outside the hospital for evaluation of iron deficiency anemia (IDA). The endoscopic workup suggested a gastric antral subepithelial lesion with an overlying arteriovenous malformation (AVM). Endoscopic ultrasound (EUS) revealed the lesion to be a lipoma. Given the patient's anemia and blood transfusion requirements, the AVM was treated with argon plasma coagulation (APC). During this treatment, desiccation of fat was noted with a significant decrease in the size of the subepithelial lesion (the gastric lipoma)...
July 31, 2017: Curēus
Jiwen Jian, Qingnan Zhang, Xuan Wu, Mingfei Zhou
The reactions of early lanthanide metal atoms (Ce, Pr, and Nd) with carbon monoxide and nitric oxide mixtures are studied by infrared absorption spectroscopy in solid argon. The reaction intermediates and products are identified via isotopic substitution as well as theoretical frequency calculations. The results show that the reactions proceed with the initial formation of inserted NLnO molecules, which subsequently react with CO to form the NLnO(CO) complexes on annealing. The NLnO(CO) complexes further isomerize to the more stable isocyanate OLnNCO species under UV light excitation...
October 10, 2017: Journal of Physical Chemistry. A
Artur Mardyukov, Yetsedaw A Tsegaw, Wolfram Sander, Peter R Schreiner
The current study focuses on the generation, identification, and characterization of the phenylselenyl radical using the matrix isolation technique in combination with density functional theory (B3LYP/cc-pVTZ) computations. The hitherto unknown phenylselenyl peroxy radical was synthesized by co-condensation of the phenylselenyl radical with molecular ground state triplet oxygen from the gas phase and subsequent trapping in argon matrices at 10 K. The experimental IR spectra including (18)O isotopically labelled materials compare well with the data obtained from B3LYP/cc-pVTZ computations...
October 18, 2017: Physical Chemistry Chemical Physics: PCCP
Felix Sharipov, Michael R Moldover
We review values of the temperature jump coefficient ζT determined from measurements of the acoustic resonance frequencies facoust of helium-filled and argon-filled, spherical cavities near ambient temperature. We combine these values of ζT with literature data for tangential momentum accommodation coefficient (TMAC) and the Cercignani-Lampis model of the gas-surface interaction to obtain measurement-derived values of the normal energy accommodation coefficient (NEAC). We found that NEAC ranges from 0 to 0...
November 2016: Journal of Vacuum Science & Technology. A, Vacuum, Surfaces, and Films
Aswathy Kaimal, Poojya Ramdev, C S Shruthi
INTRODUCTION: Yttria stabilised tetragonal zirconia opens new vistas for all ceramic restoration by the mechanism of transformation toughening, making it much stronger compared to all other ceramic materials. Currently, it is the most recent core material for all ceramic fixed partial dentures due to its ability to withstand high simulated masticatory loads. Problems which have been reported with zirconia restorations involve the core cement interface leading to loss of retention of the prosthesis...
August 2017: Journal of Clinical and Diagnostic Research: JCDR
Arif H K Pathan, Alexander Barash, Lawrence B Tena, Paul T Finger
PURPOSE: To provide a clinical description of the long-term outcome of a 103Pd plaque-irradiated ciliary body melanoma with extrascleral extension while attempting to preserve a subadjacent glaucoma filtering bleb. METHODS: A 75-year-old woman with pseudoexfoliative glaucoma for 17 years, 16 years status post argon laser trabeculoplasty, and 15 years status post trabeculectomy in the left eye, was diagnosed with an ipsilateral ciliary body melanoma with visible extrascleral extension...
September 23, 2017: European Journal of Ophthalmology
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