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https://www.readbyqxmd.com/read/28637350/structural-peculiarities-of-ion-conductive-organic-inorganic-polymer-composites-based-on-aliphatic-epoxy-resin-and-salt-of-lithium-perchlorate
#1
Liubov Matkovska, Maksym Iurzhenko, Yevgen Mamunya, Igor Tkachenko, Valeriy Demchenko, Volodymyr Synyuk, Andriy Shadrin, Gisele Boiteux
The article is concerned with hybrid amorphous polymers synthesized basing on epoxy oligomer of diglycide aliphatic ester of polyethylene glycol that was cured by polyethylene polyamine and lithium perchlorate salt. Structural peculiarities of organic-inorganic polymer composites were studied by differential scanning calorimetry, wide-angle X-ray spectra, infrared spectroscopic, scanning electron microscopy, elemental analysis, and transmission and reflective optical microscopy. On the one hand, the results showed that the introduction of LiClO4 salt into epoxy polymer leads to formation of the coordinative metal-polymer complexes of donor-acceptor type between central Li(+) ion and ligand...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28636640/targeted-nanodiamonds-for-identification-of-subcellular-protein-assemblies-in-mammalian-cells
#2
Michael P Lake, Louis-S Bouchard
Transmission electron microscopy (TEM) can be used to successfully determine the structures of proteins. However, such studies are typically done ex situ after extraction of the protein from the cellular environment. Here we describe an application for nanodiamonds as targeted intensity contrast labels in biological TEM, using the nuclear pore complex (NPC) as a model macroassembly. We demonstrate that delivery of antibody-conjugated nanodiamonds to live mammalian cells using maltotriose-conjugated polypropylenimine dendrimers results in efficient localization of nanodiamonds to the intended cellular target...
2017: PloS One
https://www.readbyqxmd.com/read/28634669/yttrium-90-y-90-resin-microsphere-therapy-for-patients-with-unresectable-hepatocellular-carcinoma-a-single-center-experience
#3
Semra İnce, Bülent Karaman, Engin Alagoz, Nuri Karadurmuş, Hüseyin Şan, Cemal Nuri Erçin, Nuri Arslan
BACKGROUND/AIM: Selective intraarterial radionuclide therapy (SIRT) with yttrium-90 (Y-90) resin microspheres presently has successful results in primary or metastatic inoperable liver tumors. This procedure, which is also known as radioembolisation, delivers high doses of radiation selectively to hepatic tumors while minimum healthy liver exposure. The aim of this study was to present our clinical experience of radiomicrosphere therapy for the treatment of patients with unresectable hepatocellular carcinoma (HCC)...
June 20, 2017: Journal of Gastrointestinal Cancer
https://www.readbyqxmd.com/read/28633132/radon-emanation-from-fresh-altered-and-disturbed-granitic-rock-characterized-by-14-c-pmma-impregnation-and-autoradiography
#4
Karl-Heinz Hellmuth, Marja Siitari-Kauppi, Hannu Arvela, Antero Lindberg, Lionel Fonteneau, Paul Sardini
Radon emanation from intact samples of fresh ("BG"), altered ("Fract") and disturbed ("EDZ") Finnish granitic rock from Kuru (Finland) and its dependence on humidity and rock structural factors was studied. The pore network of the rock was characterized by microscopy and impregnation with (14)C-PMMA (polymethylmethacrylate) resin and autoradiography. The radon emanation factor was increasing linearly with the relative humidity. (14)C-PMMA autoradiography of the altered zones and the EDZ indicated significant, mineral-specific increase of porosity and porosity gradients towards the fracture surfaces (Fract) and microcracks within the EDZ...
June 13, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28633115/occurrence-of-commonly-used-pesticides-in-personal-air-samples-and-their-associated-health-risk-among-paddy-farmers
#5
Hazwanee Hamsan, Yu Bin Ho, Siti Zulfa Zaidon, Zailina Hashim, Nazamid Saari, Ali Karami
Tanjung Karang, Selangor, is widely known for its paddy cultivation activity and hosts the third largest paddy field in Malaysia. Pesticides contamination in agriculture fields has become an unavoidable problem, as pesticides are used to increase paddy productivity and reduce plant disease. Human exposure to agrichemicals is common and could results in both acute and chronic health effects, such as acute and chronic neurotoxicity. This study aims to determine the concentrations of commonly used pesticides (azoxystrobin, buprofezin, chlorantraniliprole, difenoconazole, fipronil, imidacloprid, isoprothiolane, pretilachlor, propiconazole, pymetrozine, tebuconazole, tricyclazole, and trifloxystrobin) in personal air samples and their associated health risks among paddy farmers...
June 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28633093/fracture-resistance-of-ceramic-and-polymer-based-occlusal-veneer-restorations
#6
Majed Al-Akhali, Mohamed Sad Chaar, Adham Elsayed, Abdulaziz Samran, Matthias Kern
OBJECTIVES: The purpose of this in vitro study was to evaluate the influence of thermodynamic loading on the durability and fracture resistance behavior of occlusal veneers fabricated from different biomedical dental CAD/CAM materials. METHODS: The occlusal surfaces of 64 extracted premolars were prepared in the enamel layer and restored with occlusal veneers with a fissure/cusp thickness of 0.5/0.8mm made from four different dental CAD/CAM materials: group LD lithium disilicate (e...
June 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28631810/flavonoids-of-lotus-nelumbo-nucifera-seed-embryos-and-their-antioxidant-potential
#7
Mingzhi Zhu, Ting Liu, Chunyun Zhang, Mingquan Guo
Flavonoids from lotus (Nelumbo nucifera) seed embryos were fractionated over a macroporous resin chromatography into 2 main fractions (I and II), and subsequently identified by high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS(2) ). Sixteen flavonoids were identified in lotus seed embryos, including 8 flavonoid C-glycosides and 8 flavonoid O-glycosides, in which the flavonoid C-glycosides were the main flavonoids. Among them, 2 flavonoid O-glycosides (luteolin 7-O-neohesperidoside and kaempferol 7-O-glucoside) were identified in lotus seed embryos for the 1st time...
June 20, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28630956/accuracy-of-full-arch-scans-using-intraoral-and-extraoral-scanners-an-in-vitro-study-using-a-new-method-of-evaluation
#8
Jonas Muallah, Christian Wesemann, Roxana Nowak, Jan Robben, James Mah, Peter Pospiech, Axel Bumann
The aim of this study was to compare the accuracy of six intraoral scanners as regards clinically relevant distances using a new method of evaluation. An additional objective was to compare intraoral scanners with the indirect digitization of model scanners. A resin master model was created by 3D printing and drilled in five places to reflect the following distances: intermolar width (IMW), intercanine width (ICW), and arch length (AL). To determine a gold standard, the distances were measured with a coordinate measuring instrument (Zeiss O-Inspect 422)...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28630624/evaluation-of-the-loading-unloading-and-permanent-deformation-of-newly-available-epoxy-resin-coated-ni-ti-wires-using-self-ligating-brackets
#9
Hazel Garro-Piña, María Cristina Jiménez-Cervantes, Ricardo Ondarza-Rovira, Roberto Justus, Salvador García-López
AIM: The purpose of this study was to evaluate the load and unload deflection and permanent deformation of round 0.016'' and rectangular 0.016'' × 0.022'' regular and coated Ni-Ti wires. MATERIALS AND METHODS: Ni-Ti archwires produced by two manufacturers were evaluated. Both regular and coated round and rectangular Ni-Ti wire segments (n = 15) from each group were submitted to a three-point bending test. Both types of wires were evaluated for permanent deformation at the end of a recovery cycle...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28630399/dietary-mastic-oil-extracted-from-pistacia-lentiscus-var-chia-suppresses-tumor-growth-in-experimental-colon-cancer-models
#10
Katerina Spyridopoulou, Angeliki Tiptiri-Kourpeti, Evangeli Lampri, Eleni Fitsiou, Stavros Vasileiadis, Manolis Vamvakias, Haido Bardouki, Anna Goussia, Vasiliki Malamou-Mitsi, Mihalis I Panayiotidis, Alex Galanis, Aglaia Pappa, Katerina Chlichlia
Plant-derived bioactive compounds attract considerable interest as potential chemopreventive anticancer agents. We analyzed the volatile dietary phytochemicals (terpenes) present in mastic oil extracted from the resin of Pistacia lentiscus var. chia and comparatively investigated their effects on colon carcinoma proliferation, a) in vitro against colon cancer cell lines and b) in vivo on tumor growth in mice following oral administration. Mastic oil inhibited - more effectively than its major constituents- proliferation of colon cancer cells in vitro, attenuated migration and downregulated transcriptional expression of survivin (BIRC5a)...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28629233/a-new-antibiotic-produced-by-the-cyanobacterium-symbiotic-fungus-simplicillium-lanosoniveum
#11
Qinglin Dong, Rongzhen Dong, Xiangying Xing, Yukuan Li
The culture broth of the cyanobacterium-symbiotic fungus Simplicillium lanosoniveum var. Tianjinienss Q. L. Dong exhibited unanticipated antibacterial activities against the Gram-positive bacteria, particularly the pathogenic bacterium Staphylococcus aureus, indicating the secretion of antibiotic-like metabolite, for which the modified Sabouraud medium was the suitable medium. The antibiotic-like metabolite was separated with macroporous resins CT-12 (absorption) and 95% ethanol (desorption), purified by ion-exchange resins D301T and displayed a characteristic absorption peak at 228 nm, suggesting the presence of nitrogen...
June 19, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28629032/effects-of-silane-modified-fillers-on-properties-of-dental-composite-resin
#12
Aysu Aydınoğlu, Afife Binnaz Hazar Yoruç
The effect of silanization on the mechanical, chemical, and physical properties of dental composites was investigated. Silica fillers were obtained from colloidal silica solution, Ludox® HS-40 and they were silanized by using 3-methacryloxypropyl trimethoxysilane (MPTMS) in an acidic media. Mineralogical and chemical structures of unsilanized and silanized fillers were determined by using XRD and FT-IR analyses. The modification of unsilanized/silanized fillers were investigated by performing XPS and TGA analyses...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628917/anatomical-characteristics-of-facial-nerve-and-cochlea-interaction
#13
Nadine Schart-Morén, Sune Larsson, Helge Rask-Andersen, Hao Li
OBJECTIVE: The aim was to study the relationship between the labyrinthine portion (LP) of the facial canal and the cochlea in human inner ear molds and temporal bones using micro-CT and 3D rendering. A reduced cochlea-facial distance may spread electric currents from the cochlear implant to the LP and cause facial nerve stimulation. Influencing factors may be the topographic anatomy and otic capsule properties. METHODS: An archival collection of human temporal bones underwent micro-CT and 3D reconstruction...
June 20, 2017: Audiology & Neuro-otology
https://www.readbyqxmd.com/read/28628735/effect-of-shade-opacity-and-layer-thickness-on-light-transmission-through-a-nano-hybrid-dental-composite-during-curing
#14
Hong-Keun Hyun, Carly K Christoferson, Carmem S Pfeifer, Chris Felix, Jack L Ferracane
OBJECTIVE: The aim of this study was to investigate the effect of shade and opacity on the change in light transmission through different thicknesses of a nano-hybrid composite during curing. MATERIALS AND METHODS: Twelve different shades of Venus Diamond (Heraeus Kulzer) were placed in disk shaped molds with thickness of 1, 2, and 3 mm (n = 3 per group) and cured with an LED light-curing unit. Initial, final and average irradiance, and the total amount of energy passing through the specimen were measured using the MARC Resin Calibrator at every 10s for a total of 40s...
June 19, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28627544/anchoring-ceria-nanoparticles-on-graphene-oxide-and-their-radical-scavenge-properties-under-gamma-irradiation-environment
#15
Wei Xia, Jun Zhao, Tao Wang, Li Song, Hao Gong, Hu Guo, Bing Gao, Xiaoli Fan, Jianping He
Polymer networks such as those of epoxy resin, as common protection materials, possess radiolytic oxidation degradation effects under gamma irradiation environment, which have a great accelerating effect on the ageing rate and severely limit their potential applications for metal protection in the nuclear industry. To overcome this, we report a simple scheme of anchoring crystalline ceria nanoparticles onto graphene sheets (CG) and incorporate it into the epoxy resin, followed by thermal polymerization to obtain CeO2/graphene-epoxy nanocomposite coating (CGNS)...
June 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28627111/european-surveillance-system-on-contact-allergies-essca-results-with-the-european-baseline-series-2013-14
#16
W Uter, J C Amario-Hita, A Balato, B Ballmer-Weber, A Bauer, A Belloni Fortina, A Bircher, M M U Chowdhury, S M Cooper, A Dugonik, R Gallo, A Giménez-Arnau, J D Johansen, S M John, M Kieć-Świerczyńska, T Kmecl, B Kręcisz, F Larese Filon, V Mahler, M Pesonen, T Rustemeyer, A Sadowska-Przytocka, J Sánchez-Perez, S Schliemann, M L Schuttelaar, D Simon, R Spiewak, S Valiukeviciene, E Weisshaar, I R White, S M Wilkinson
BACKGROUND: Contact allergy is a common condition and can severely interfere with daily life or professional activities. Due to changes in exposures, a consequence of introduction of new substances, new products or formulations, and regulatory intervention, the spectrum of contact sensitisation changes. OBJECTIVE: To evaluate the current spectrum of contact allergy to allergens present in the European baseline series (EBS) across Europe. METHODS: Retrospective analysis of data collected by the European Surveillance System on Contact Allergies (ESSCA, www...
June 19, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28626207/influence-of-polymerization-properties-of-4-meta-mma-based-resin-on-the-activity-of-fibroblast-growth-factor-2
#17
Haruaki Kitagawa, Kahoru Takeda, Ririko Tsuboi, Mikako Hayashi, Jun-Ichi Sasaki, Satoshi Imazato
Dental adhesive resins based on 4-methacryloxyethyl trimellitate anhydride (4-META)/methyl methacrylate (MMA) have been utilized for root-end filling and the bonding of fractured roots. To increase the success rate of these treatments, it would be beneficial to promote the healing of surrounding tissue by applying growth factors. In this study, the influences of the polymerization properties of 4-META/MMA-based resins on the activity of fibroblast growth factor-2 (FGF-2) were evaluated in vitro. The temperature increase caused by the heat generation during polymerization of the 4-META/MMA-based resin was insufficient to change the structure and function of FGF-2...
June 15, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28626205/designing-an-antibacterial-acrylic-resin-using-the-cosolvent-method-effect-of-ethanol-on-the-optical-and-mechanical-properties-of-a-cold-cure-acrylic-resin
#18
Takashi Nezu, Futami Nagano-Takebe, Kazuhiko Endo
Antimicrobial cetylpyridinium chloride (CPC) has low miscibility with acrylic resin monomer but can be homogeneously mixed using ethanol as a cosolvent. This study investigated the effects of ethanol addition on the properties of a cold-cure acrylic resin. Ethanol was an excellent cosolvent for CPC and methyl methacrylate monomer (MMA), but the cured resin exhibited a strong change in coloration to yellow (ΔE*ab>8) and a drastically reduced bending strength (from 97 to 25 MPa) and elastic modulus (from 2...
June 15, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28626204/intrapulpal-temperature-changes-during-curing-of-different-bulk-fill-restorative-materials
#19
Elif Yasa, Cigdem Atalayin, Gamze Karacolak, Tugrul Sari, L Sebnem Turkun
The aim of this study was to evaluate the intrapulpal temperature changes during the curing of different bulk-fill restorative materials. Ten mandibular molar teeth were selected and occlusal surfaces were removed to obtain a standard 0.5 mm occlusal dentin thickness. Five bulk-fill restorative materials and a conventional resin composite (control) were applied. The intrapulpal temperature changes during the curing of these materials were determined by a device simulating pulpal blood microcirculation. The difference between the initial and maximum temperature values (Δt), was recorded...
June 15, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28626203/rheological-approach-for-determining-yield-stresses-in-flowable-resin-composites-prior-to-setting
#20
Masaki Asakura, Tatsuhide Hayashi, Shozo Tsuruta, Mitsunori Yamamoto, Shuichiro Kobayashi, Akimichi Mieki, Tatsushi Kawai
The purpose of this study is to develop a method for quantifying the fluidity of flowable resin composites using determinations of yield stress. Five commercially available composites (AliteFlo LV, Flow-it ALC, Venus flow, Tetric N-flow, Revolution Formula2) were investigated. Yield stress values were obtained by plotting shear stresses for a range of shear rates, followed by fitting of Casson fluid models to flow curve data and extrapolation to the stress axis. To confirm that yield stress reflected fluidity, apparent viscosity at the lower shear rate (0...
June 15, 2017: Dental Materials Journal
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