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https://www.readbyqxmd.com/read/28823048/three-dimensional-morphology-of-rigid-structures-as-a-tool-for-taxonomic-studies-of-dactylogyridae-monogenea
#1
María A Rossin, Pablo N De Francesco, Juan T Timi
Dactylogyridae is overwhelmingly the most abundant and diverse taxon among monogeneans in continental waters of South America. Their small body size requires considerable sampling effort and training for collecting and identifying the worms from the gills, skin, nasal cavities, and other microhabitats. Indeed, diagnostic characteristics as sclerites and male copulatory complex are generally less than 100-μm long and are essential for taxonomic description and identification of species. Here, a combination of simple and routine methods for three-dimensional morphological studies on hard structures is proposed for dactylogirids: SDS treatment for clarification of specimens and enzymatic digestion with proteinase K for freeing sclerotized structures, followed by laser confocal microscopy...
August 19, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28822873/surface-modification-of-an-intraocular-lens-material-by-plasma-assisted-grafting-with-2-hydroxyethyl-methacrylate-hema-for-controlled-release-of-moxifloxacin
#2
A Paula Vieira, Andreia F R Pimenta, Diana Silva, M Helena Gil, Patrícia Alves, Patrícia Coimbra, José L G C Mata, Dimitriya Bozukova, Tiago R Correia, Ilídio J Correia, A Paula Serro, A Jorge Guiomar
Endophthalmitis, an inflammation of the eye due to perioperative infection, may occur after cataract surgery. Intraocular lenses (IOLs) loaded with an antibiotic have been proposed as an alternative to the conventional postoperative endophthalmitis prophylaxis, since the antibiotic is delivered directly to the target site. In this work, an IOL-based antibiotic releasing system was prepared from a copolymer used in the production of IOLs and a fluoroquinolone used in endophthalmitis prophylaxis (moxifloxacin, MFX)...
August 16, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28819665/efficient-photoelectrochemical-water-splitting-on-ultrasmall-defect-rich-taox-nanoclusters-enhanced-by-size-selected-pt-nanocluster-promoters
#3
Saurabh Srivastava, Joseph Palathinkal Thomas, Nina Heinig, Marwa Abd-Ellah, Md Anisur Rahman, Kam Tong Leung
Formation of nanoclusters has attracted a lot of attention in recent years because of their distinct properties from isolated atoms and bulk solids. Here, we focus on the catalytic properties of supported transition metal oxide nanoclusters, such as TaO2, with a well-defined size distribution below 10 nm. We show that their catalytic performance can be greatly enhanced by introducing a reaction promoter such as Pt. Different combinations of precisely size-selected, defect-rich TaOx and Pt nanoclusters are produced by a gas-phase aggregation technique in a special DC magnetron sputtering system...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28817132/plasma-of-argon-cleaning-treatment-on-implant-abutments-in-periodontally-healthy-patients-six-years-postloading-results-of-a-randomized-controlled-trial
#4
Luigi Canullo, Marco Tallarico, Miguel Penarrocha, Giuseppe Corrente, Joseph Fiorellini, David Penarrocha
The aim of this randomized, match-paired, triple-blinded, controlled clinical trial was to assess the 6-year radiographic changes around customized platform-switched abutments placed according to the one abutment-one time concept, with and without plasma of argon cleaning treatment. A total of 20 periodontally healthy patients received one maxillary implant between the premolars. Immediately before stage 2 surgery and abutment connection, patients were randomly assigned to the control (cleaning protocol by steam) or test group (plasma of argon treatment)...
September 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28816459/observation-and-characterization-of-ch3ch2-mh-ch2-2-mh2-ch2-ch-mh3-and-ch3-c%C3%A2-mh3-produced-by-reactions-of-group-5-metal-atoms-with-ethane
#5
Han-Gook Cho, Lester Andrews
The primary products in reactions of laser-ablated group 5 metal atoms with ethane have been identified in argon matrix IR spectra and characterized via DFT computations. The 2nd and 3rd row transition-metals produced insertion, metallacyclopropane, vinyl trihydrido, and anionic ethylidyne complexes (CH3CH2-MH, (CH2)2-MH2, CH2=CH-MH3, and CH3C≡MH3-) while the 1st row transition-metal yielded only the insertion and metallacyclopropane products. The energetically higher ethylidenes and neutral ethylidynes (CH3CH=MH2 and CH3C≐MH3) were not detected...
August 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28812877/scru2b3-and-sc2rub6-borides-featuring-a-2d-infinite-boron-clustering
#6
Leonid P Salamakha, Oksana Sologub, Berthold Stöger, Peter Franz Rogl, Monika Waas, Volodymyr B Kapustianyk, Ernst Bauer
Two borides, ScRu2B3 and Sc2RuB6, were obtained by argon-arc melting of the elements followed by annealing at 800 °C. ScRu2B3 exhibits a new structure type with the space group Cmcm (a = 3.0195(2) Å, b = 15.4056(8) Å, c = 5.4492(3) Å; single crystal X-ray data; RF(2) = 0.0105). Sc2RuB6 adopts the Y2ReB6-type structure (space group Pbam; a = 8.8545(2) Å, b = 11.1620(3) Å, c = 3.4760(1) Å; single crystal X-ray data; RF(2) = 0.0185). ScRu2B3 displays an unusual intergrowth of CeCo3B2- and AlB2-related slabs; a striking feature is a boat configuration of puckered boron hexagons within infinite graphite like boron layers (6(3) nets)...
August 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28811720/endoscopic-occlusion-with-silicone-spigots-for-the-closure-of-refractory-esophago-bronchiole-fistula-after-esophagectomy
#7
Masaya Uesato, Tsuguaki Kono, Yasunori Akutsu, Kentarou Murakami, Akiko Kagaya, Yorihiko Muto, Akira Nakano, Mizuho Aikawa, Tomohide Tamachi, Hiroyuki Amagai, Takahiro Arasawa, Yasuhide Muto, Hisahiro Matsubara
A 65-year-old man with cT1bN0M0 stage I middle thoracic esophageal cancer underwent subtotal esophagectomy and gastric tube reconstruction through the posterior mediastinal route after preoperative carbon-ion radiotherapy and chemotherapy in a clinical trial. Anastomotic leakage occurred, but it spontaneously improved. At six months after the operation, he was rehospitalized with a cough and dysphagia. An esophago-bronchiole fistula and stenosis of the gastric tube were observed. He first underwent stent placement in the gastric tube...
July 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28803102/kinetics-of-the-release-of-elemental-precursors-of-syngas-and-syngas-contaminants-during-devolatilization-of-switchgrass
#8
Oluwafemi Oyedeji, Charles Stuart Daw, Nicole Labbe, Paul Ayers, Nourredine Abdoulmoumine
In this study, the results from laboratory measurements of the devolatilization kinetics of switchgrass in a rapidly heated fixed bed reactor flushed with argon and operated at constant temperatures between 600 and 800°C was reported. Results indicate that switchgrass decomposes in two sequential stages during pyrolysis: stage I involves the evaporation and devolatilization of water and extractives and stage II involves that of hemicellulose, cellulose, and lignin. The estimated global activation energy for stage II increased from 52...
July 29, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28802553/effect-of-cold-argon-plasma-on-eggs-of-the-blow-fly-lucilia-cuprina-diptera-calliphoridae
#9
Kwankamol Limsopatham, Dheerawan Boonyawan, Chanchai Umongno, Kabkaew L Sukontason, Tarinee Chaiwong, Rattana Leksomboon, Kom Sukontason
Non-thermal plasma has been used in many medical applications, including treatment of living cells, blood coagulation, wound healing, and sterilization. The process uses an environmentally friendly gas (e.g., argon, helium, oxygen, nitrogen, or hydrogen) to destroy bacteria cells with no serious adverse effect on humans or animals. However, information on the effect of argon plasma on blow fly eggs is lacking. In this study, we explored the ability of cold argon plasma to destroy the eggs of the Australian sheep blow fly, Lucilia cuprina (Wiedemann, 1830); its larvae are a myiasis-producing agent in both human and animals...
August 9, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28799374/overcoming-time-scale-and-finite-size-limitations-to-compute-nucleation-rates-from-small-scale-well-tempered-metadynamics-simulations
#10
Matteo Salvalaglio, Pratyush Tiwary, Giovanni Maria Maggioni, Marco Mazzotti, Michele Parrinello
Condensation of a liquid droplet from a supersaturated vapour phase is initiated by a prototypical nucleation event. As such it is challenging to compute its rate from atomistic molecular dynamics simulations. In fact at realistic supersaturation conditions condensation occurs on time scales that far exceed what can be reached with conventional molecular dynamics methods. Another known problem in this context is the distortion of the free energy profile associated to nucleation due to the small, finite size of typical simulation boxes...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28789527/is-magnetic-bistability-of-carbenes-a-general-phenomenon-isolation-of-simple-aryl-trifluoromethyl-carbenes-in-both-their-singlet-and-triplet-states
#11
Yetsedaw A Tsegaw, Pritam Eknath Kadam, Niklas Tötsch, Elsa Sanchez-Garcia, Wolfram Sander
p-Tolyl(trifluoromethyl) carbene and the related fluorenyl(trifluoromethyl)carbene were synthesized in solid argon and characterized by IR, UV-vis, and EPR spectroscopy as well as by quantum mechanical calculations. The carbenes can be generated in both their triplet and singlet states, and both states coexist under the conditions of matrix isolation. According to our calculations, the singlet and triplet states of these car-benes are energetically nearly degenerate in the gas phase. Warming of matrices containing pure triplet p-tolyl(trifluoromethyl) carbene from 3 to 25 K leads to an interconversion of up to 20% of the triplet into the singlet state...
August 8, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28782440/colloidal-synthesis-of-biocompatible-iron-disulphide-nanocrystals
#12
J Santos-Cruz, R E Nuñez-Anita, S A Mayén-Hernández, O Martínez-Alvarez, L S Acosta-Torres, J de la Fuente-Hernández, E Campos-González, M Vega-González, M C Arenas-Arrocena
The aim of this research was to synthesis biocompatible iron disulphide nanocrystals at different reaction temperatures using the colloidal synthesis methodology. Synthesis was conducted at the 220-240 °C range of reaction temperatures at intervals of 5 °C in an inert argon atmosphere. The toxicity of iron disulphide nanocrystals was evaluated in vitro using mouse fibroblast cell line. Two complementary assays were conducted: the first to evaluate cell viability of the fibroblast via an MTT assay and the second to determine the preservation of fibroblast nuclei integrity through DAPI staining, which labels nuclear DNA in fluorescence microscopes...
August 6, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28780852/dual-beam-depth-profiling-and-imaging-with-argon-and-bismuth-clusters-of-prenylated-stilbenes-on-glandular-trichomes-of-macaranga-vedeliana
#13
Tiphaine Péresse, Nicolas Elie, David Touboul, Van Cuong Pham, Vincent Dumontet, Fanny Roussi, Marc Litaudon, Alain Brunelle
Using a time-of-flight secondary ion mass spectrometer equipped with an argon cluster ion for sputtering and a bismuth liquid metal ion source for analysis, both surfaces of leaves and fruits of Macaranga vedeliana, an endemic New Caledonian species have been for the first time analyzed by a dual beam depth profiling. To prevent in-vacuum evaporation of the liquid content of the small glandular trichomes covering fruits and leaves surfaces, and also to be able to analyze their liquid content while preventing any sublimation of the latter, the samples were kept frozen during the whole experiment using a nitrogen cooled sample holder...
August 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28780800/-argon-plasma-coagulation-combined-with-co-2-cryotherapy-under-bronchoscope-for-treatment-of-40-patients-with-pulmoconiosis-complicated-by-lung-cancer-in-central-airway
#14
L Chen, Y Y Zhang, C X Yu
No abstract text is available yet for this article.
May 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/28780442/cold-plasma-interactions-with-plants-morphing-and-movements-of-venus-flytrap-and-mimosa-pudica-induced-by-argon-plasma-jet
#15
Alexander G Volkov, Kunning G Xu, Vladimir I Kolobov
Low temperature (cold) plasma finds an increasing number of applications in biology, medicine and agriculture. In this paper, we report a new effect of plasma induced morphing and movements of Venus flytrap and Mimosa pudica. We have experimentally observed plasma activation of sensitive plant movements and morphing structures in these plants similar to stimulation of their mechanosensors in vivo. Application of an atmospheric pressure argon plasma jet to the inside or outside of a lobe, midrib, or cilia in Dionaea muscipula Ellis induces trap closing...
July 29, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28773947/behavior-of-human-bone-marrow-derived-mesenchymal-stem-cells-on-various-titanium-based-coatings
#16
Chengjuan Qu, Salla Kaitainen, Heikki Kröger, Reijo Lappalainen, Mikko J Lammi
The chemical composition and texture of titanium coatings can influence the growth characteristics of the adhered cells. An enhanced proliferation of the human mesenchymal stem cells (hMSCs) would be beneficial. The present study was aimed to investigate whether titanium deposited at different atmospheres would affect the cell growth properties, cellular morphology, and expression of surface markers of hMSCs. Titanium-based coatings were deposited on silicon wafers under oxygen, nitrogen, or argon atmospheres by ultra-short pulsed laser deposition using two different gas pressures followed by heating at 400 °C for 2 h...
October 12, 2016: Materials
https://www.readbyqxmd.com/read/28772532/influence-of-substrate-heating-and-nitrogen-flow-on-the-composition-morphological-and-mechanical-properties-of-sinx-coatings-aimed-for-joint-replacements
#17
Charlotte Skjöldebrand, Susann Schmidt, Vicky Vuong, Maria Pettersson, Kathryn Grandfield, Hans Högberg, Håkan Engqvist, Cecilia Persson
Silicon nitride (SiNx) coatings are promising for joint replacement applications due to their high wear resistance and biocompatibility. For such coatings, a higher nitrogen content, obtained through an increased nitrogen gas supply, has been found to be beneficial in terms of a decreased dissolution rate of the coatings. The substrate temperature has also been found to affect the composition as well as the microstructure of similar coatings. The aim of this study was to investigate the effect of the substrate temperature and nitrogen flow on the coating composition, microstructure and mechanical properties...
February 13, 2017: Materials
https://www.readbyqxmd.com/read/28771351/photo-induced-reversible-electron-transfer-between-the-benzhydryl-radical-and-benzhydryl-cation-in-amorphous-water-ice
#18
Soumya Radhakrishnan, Joel Mieres Perez, Murthy S Gudipati, Wolfram Sander
The benzhydryl radical is generated in high yields by flash vacuum thermolysis of 1,1,2,2-tetraphenylethane with subsequent trapping of the product in argon or amorphous water at 3 - 4 K. Photoionization of the radical with various UV light and electron sources produces the benzhy-dryl cation which was identified by IR and UV-vis spectroscopy. In solid argon, the formation of the benzhydryl cation is irreversible, whereas in amorphous water ice the electron transfer is reversible, and irradiation into the major absorption band at 443 nm of the cation leads back to the radical by electron attachment...
August 3, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28770995/short-term-environmental-effects-and-their-influence-on-spatial-homogeneity-of-organic-solar-cell-functionality
#19
Huei-Ting Chien, Peter Wilhelm Zach, Bettina Friedel
In this study, we focus on induced degradation and spatial inhomogeneity of organic photovoltaic devices under different environmental conditions, uncoupled from the influence of any auxiliary hole-transport (HT) layer. During testing of according devices comprising the standard photoactive layer of poly(3-hexylthiophene) (P3HT) as donor, blended with phenyl-C61-butyric acid methyl ester (PC60BM) as acceptor, a comparison was made between non-encapsulated devices upon exposure to argon in the dark, dry air in the dark, dry air with illumination and humid air in the dark...
August 3, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28769593/resolution-of-pinguecula-related-dry-eye-disease-after-argon-laser-photocoagulation
#20
Pietro Emanuele Napoli, Raffaele Sanna, Claudio Iovino, Maurizio Fossarello
PURPOSE: To describe an unusual case of unilateral, chronic symptoms and signs of dry eye, and recurrent episodes of ocular irritation related to pinguecula, which were refractory to prior medical treatments, successfully treated with argon laser photocoagulation. METHODS: A 36-year-old man presented with an elevated yellowish mass on his conjunctiva in his left eye, which was associated with dry eye symptoms and general discomfort, such as "tightening sensation" and "stiffness"...
2017: International Medical Case Reports Journal
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