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Zhengxu Yan, Lingling Zhang, Zhe Zhao, Huan Qi, Yu Li, Daqiang Cang
This study investigated the inactivation efficiency of ZnO nanofluids against E. coli in sonophotocatalysis with the aeration of nitrogen, oxygen, argon and their mixtures. The results showed that inactivation efficiency was increased when aeration was combined with sonophotocatalysis. Addition of different types of gases could lead to the different inactivation efficiency. The inactivation efficiencies were shown in the following order: no aeration < nitrogen < argon < oxygen < Ar/O2 (3:7) < Ar/O2 (7:3) < Ar/O2 (5:5)...
October 2018: Ultrasonics Sonochemistry
Himanshu Goel, Sanliang Ling, Breanna Nicole Ellis, Anna Taconi, Ben Slater, Neeraj Rai
Predicting vapor liquid equilibria (VLE) of molecules governed by weak van der Waals (vdW) interactions using the first principles approach is a significant challenge. Due to the poor scaling of the post Hartree-Fock wave function theory with system size/basis functions, the Kohn-Sham density functional theory (DFT) is preferred for systems with a large number of molecules. However, traditional DFT cannot adequately account for medium to long range correlations which are necessary for modeling vdW interactions...
June 14, 2018: Journal of Chemical Physics
M Fevzi Celayir, Kinyas Kartal, Mehmet Mihmanli
OBJECTIVES: Condyloma acuminata (CA) is mainly caused by human papillomavirus (HPV) types 6 and 11. Clinicians use many different methods to treat analcondyloma acuminate ( CA). In this study, we aimed to compare electrocautery ablation (ECA) and argon plasma coagulation (APC) techniques in terms of postoperative bleeding, pain, scar development, loss of sexual sensation, and recurrence rates. METHODS: A retrospective analysis of collected data was performed for 49consecutive patients with CA, who underwent surgery between July 2011 and July 2014...
June 14, 2018: Annali Italiani di Chirurgia
Lutz Schmitz, Schapoor Hessam, Lisa Scholl, Sarah Reitenbach, Marc Hanno Segert, Thilo Gambichler, Eggert Stockfleth, Falk Georges Bechara
Actinic keratoses (AKs) can progress into invasive squamous cell carcinoma and thus may become a life threatening disease. Argon plasma coagulation (APC) might complement the therapeutic armamentarium in particular for AK lesions. However, there is no data on APC induced micromorphological changes following the treatment of AKs. We aimed to determine in-vivo APC induced effects on the epidermis and dermo-epidermal junction zone (DEJ) in AK lesions. We performed APC in 108 AKs using the spray mode with a power setting of 15W and a flow rate of 2...
June 12, 2018: Journal of Biophotonics
SeyedHosein Payandeh GharibDoust, Michael Heere, Carlo Nervi, Magnus H Sørby, Bjørn C Hauback, Torben R Jensen
In this work, praseodymium(iii) borohydride, Pr(BH4)3, and an isotopically enriched analogue, Pr(11BD4)3, are prepared by a new route via a solvate complex, Pr(11BD4)3S(CH3)2. Nd(BH4)3 was synthesized using the same method and the structures, polymorphic transformations, and thermal stabilities of these compounds are investigated in detail. α-Pr(BH4)3 and α-Nd(BH4)3 are isostructural with cubic unit cells (Pa3[combining macron]) stable at room temperature (RT) and a unit cell volume per formula unit (V/Z) of 180...
June 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Jessica P Porterfield, Sandra Eibenberger, David Patterson, Michael C McCarthy
We have developed a method to quantify reaction product ratios using high resolution microwave spectroscopy in a cryogenic buffer gas cell. We demonstrate the power of this method with the study of the ozonolysis of isoprene, CH2[double bond, length as m-dash]C(CH3)-CH[double bond, length as m-dash]CH2, the most abundant, non-methane hydrocarbon emitted into the atmosphere by vegetation. Isoprene is an asymmetric diene, and reacts with O3 at the 1,2 position to produce methyl vinyl ketone (MVK), formaldehyde, and a pair of carbonyl oxides: [CH3CO-CH[double bond, length as m-dash]CH2 + CH2[double bond, length as m-dash]OO] + [CH2[double bond, length as m-dash]O + CH3COO-CH[double bond, length as m-dash]CH2]...
June 12, 2018: Physical Chemistry Chemical Physics: PCCP
Mohamed Ismail, Tommy Kjærgaard Nielsen, Brunolf Lagerveld, Julien Garnon, David Breen, Alexander King, Marco van Strijen, Francis X Keeley
Renal cryoablation is becoming an established treatment option for small renal masses. It allows preservation of renal function without compromising cancer control. The technique has evolved considerably since it was first reported using liquid nitrogen over 20 years ago. We describe the modern technique for both laparoscopic and image guided renal cryoablation. Renal cryoablation is performed either laparoscopically or percutaneously depending on tumour characteristics. Common features include biopsy of the mass, protection of adjacent organs, and the use of compressed argon gas for freezing and helium for thawing...
June 8, 2018: Cryobiology
Huihui Liu, Yajing Li, Mengwei Yuan, Genban Sun, Huifeng Li, Shulan Ma, Qingliang Liao, Yue Zhang
The electrospinning and annealing methods is applied to prepare cobalt nanoparticles decorated in N-doped carbon nanofibers (Co/N-C NFs) with solid and macroporous structures. In detail, the nanocomposites are synthesized by carbonization of as-electrospun polyacrylonitrile (PAN)/cobalt acetylacetonate nanofibers in an argon atmosphere. The solid Co/N-C NFs has lengths up to dozens of microns with the average diameter of ca. 500 nm and possess abundant cobalt nanoparticles on both the surface and within the fibers, and the cobalt nanoparticles size is about 20 nm...
June 11, 2018: ACS Applied Materials & Interfaces
Tatjana Adzic-Vukicevic, Aleksandra Barac, Ana Blanka-Protic, Spasoje Popovic, Zivka Uskokovic-Stefanovic, Jelena Stojsic, Aleksandra Dudvarski Ilic
We reported the first case of inoperative thymic adenocarcinoma successfully palliative treated by the double-stent procedure. In a patient who expressed stridor, computed tomography was done and necrotic mediastinal mass, which protrudes into a trachea, was demonstrated. Fiberoptic bronchoscopy showed tracheal infiltration and 70% stenosis; therefore, surgical resection was inapplicable. Recanalization with repeated argon plasma coagulation and debridement of necrotic mass was performed, followed by placement of the endotracheal stent, radiotherapy, and chemotherapy...
2018: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
Ka-Him Chun, Hua Zhang, Wing-Tat Chan
Double-viewing-position single-particle inductively coupled plasma-atomic emission spectrometry (DVP-SP-ICP-AES) measures emission intensity at two ICP vertical positions simultaneously using a single photomultiplier tube. A particle travelling up the ICP gives two consecutive temporal emission peaks. The Yb II 328.937-nm emission intensity of the two peaks for single Yb2 O3 particles of diameter of 200 - 2000 nm are plotted against each other in a correlation plot. The correlation is poor when the gas temperature at the lower observation position is approximately the boiling point of the particles...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Masaki Ohata, Kohei Nishiguchi
A novel gas to particle conversion-gas exchange technique coupled with inductively coupled plasma mass spectrometry (GPD-GED-ICP-MS) was recently proposed for the direct analysis of ultra-trace levels of metallic compound gases such as metal carbonyl and semiconductor gases as well as gaseous mercury (Hg) in ambient air. These metallic compound gases should reveal reactivity with respect to ozone and gas to particle conversion could be obtained in a gas to particle conversion device (GPD) through metal oxides by oxidation...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Camille A Kezer, Neil Gupta
PURPOSE OF REVIEW: This article aims to review current therapeutic endoscopic treatments available for the management of gastrointestinal bleeding related to cirrhosis. RECENT FINDINGS: Endoscopic band ligation is an effective treatment for primary prophylaxis, acute bleeding, and secondary prophylaxis of esophageal varices as well as for acute bleeding and secondary prophylaxis of select gastric varices. Sclerotherapy is a treatment option for acute bleeding and secondary prophylaxis of esophageal varices when band ligation is technically difficult...
June 9, 2018: Current Gastroenterology Reports
Francis G J Longford, Jonathan W Essex, Chris-Kriton Skylaris, Jeremy G Frey
We present an unexpected finite size effect affecting interfacial molecular simulations that is proportional to the width-to-surface-area ratio of the bulk phase Ll /A. This finite size effect has a significant impact on the variance of surface tension values calculated using the virial summation method. A theoretical derivation of the origin of the effect is proposed, giving a new insight into the importance of optimising system dimensions in interfacial simulations. We demonstrate the consequences of this finite size effect via a new way to estimate the surface energetic and entropic properties of simulated air-liquid interfaces...
June 7, 2018: Journal of Chemical Physics
Jung Bin In, Kang Rae Cho, Tung Xuan Tran, Seok-Min Kim, Yinmin Wang, Costas P Grigoropoulos, Aleksandr Noy, Francesco Fornasiero
We investigate the thermal stability of alumina supporting layers sputtered at different conditions and its effect on the growth of aligned single-walled carbon nanotube arrays. Radio frequency magnetron sputtering of alumina under oxygen-argon atmosphere produces a Si-rich alumina alloy film on a silicon substrate. Atomic force microscopy on the annealed catalysts reveals that Si-rich alumina films are more stable than alumina layers with low Si content at the elevated temperatures at which the growth of single-walled carbon nanotubes is initiated...
June 7, 2018: Nanoscale Research Letters
Frederico V Prudente, Jorge M C Marques, Francisco B Pereira
Correction for 'Solvation of Li+ by argon: how important are three-body forces?' by Frederico V. Prudente et al., Phys. Chem. Chem. Phys., 2017, 19, 25707-25716.
June 7, 2018: Physical Chemistry Chemical Physics: PCCP
Yihua Liu, Maria Chiara Munisso, Atsushi Mahara, Yusuke Kambe, Kyoko Fukazawa, Kazuhiko Ishihara, Tetsuji Yamaoka
An effective surface grafting method for chemically inert and elaborately porous medical expanded-polytetrafluoroethylene (ePTFE) was developed. Although surface graft polymerization onto basic polymeric biomaterials has been widely studied, successful modification of the ePTFE surface has been lacking due to its high chemical resistance. Herein, we succeeded in surface graft polymerization onto ePTFE through glycidyl methacrylate (GMA) as a bridge linkage following argon (Ar) plasma treatment. The epoxy group of GMA was expected to react with the peroxide groups produced on ePTFE by Ar plasma exposure, and its methacrylic groups can copolymerize with various monomers...
June 7, 2018: Biomaterials Science
Inga Jordan, Arohi Jain, Thomas Gaumnitz, Jun Ma, Hans Jakob Wörner
A compact time-of-flight spectrometer for applications in attosecond spectroscopy in the liquid and gas phases is presented. It allows for altering the collection efficiency by transitioning between field-free and magnetic-bottle operation modes. High energy resolution (ΔE/E = 0.03 for kinetic energies >20 eV) is achieved despite the short flight-tube length through a homogeneous deceleration potential at the beginning of the flight tube. A closing mechanism allows isolating the vacuum system of the flight tube from the interaction region in order to efficiently perform liquid-microjet experiments...
May 2018: Review of Scientific Instruments
L Chandana, C J Sangeetha, T Shashidhar, Ch Subrahmanyam
This study reports the potential of non-thermal atmospheric pressure plasma jet for the bacterial inactivation in an aqueous medium. All experiments were conducted in a reactor containing aqueous solution i.e., water, pre-inoculated with bacterial suspensions and after plasma exposure solution is inoculated in Petrifilm to know the viable count. The plasma jet exposure to the bacterial aqueous solution was carried out under various gases such as helium, argon, air and also in combination as Argon + Air and Helium + Air...
June 1, 2018: Science of the Total Environment
R E Asfin, S M Melikova, K S Rutkowski
The FTIR spectra of fluoroform + methyl fluoride mixtures trapped in argon and nitrogen matrices are studied at T~10-30 K. Spectroscopic changes observed in the region of the CH stretching mode of fluoroform are typical for weak blue shifting H - bonds of CH⋯F type. The degeneracy lifting effect found on E - type bands of fluoroform interacted with methyl fluoride suggests the complex formation of a nonlinear form. The experimental results are confirmed by ab initio calculations of fluoroform + methyl fluoride based on the second order Møller-Plesset theory of perturbations utilizing advanced basis set...
May 29, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
V S Santosh K Kondeti, Chi Q Phan, Kristian Wende, Helena Jablonowski, Urvashi Gangal, Jennifer L Granick, Ryan C Hunter, Peter J Bruggeman
Different chemical pathways leading to the inactivation of Pseudomonas aeruginosa and Staphylococcus aureus by a cold atmospheric pressure plasma jet (APPJ) in buffered and non-buffered solutions are reported. As APPJs produce a complex mixture of reactive species in solution, a comprehensive set of diagnostics were used to assess the liquid phase chemistry. This includes absorption and electron paramagnetic resonance spectroscopy in addition to a scavenger study to assess the relative importance of the various plasma produced species involved in the inactivation of bacteria...
June 1, 2018: Free Radical Biology & Medicine
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