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https://www.readbyqxmd.com/read/28430810/efficacy-of-fluoride-varnishes-for-preventing-enamel-demineralization-after-interproximal-enamel-reduction-qualitative-and-quantitative-evaluation
#1
Ascensión Vicente, Antonio José Ortiz Ruiz, Belén Manuela González Paz, José García López, Luis-Alberto Bravo-González
OBJECTIVES: To evaluate quantitatively and qualitatively the changes produced to enamel after interproximal reduction and subjected to demineralization cycles, after applying a fluoride varnish (Profluorid) and a fluoride varnish containing tricalcium phosphate modified by fumaric acid (Clinpro White). MATERIALS AND METHODS: 138 interproximal dental surfaces were divided into six groups: 1) Intact enamel; 2) Intact enamel + demineralization cycles (DC); 3) Interproximal Reduction (IR); 4) IR + DC; 5) IR + Profluorid + DC; 6) IR + Clinpro White + DC...
2017: PloS One
https://www.readbyqxmd.com/read/28430400/highly-sensitive-hplc-method-for-the-determination-of-galantamine-in-human-plasma-and-urine-through-derivatization-with-dansyl-chloride-using-fluorescence-detector
#2
Elif Özdemir, Sevgi Tatar Ulu
A new method based on fluorescence derivatization with 5-(dimethylamino) naphthalene-1-sulfonyl chloride (dansyl chloride) was developed for the quantitative determination of galantamine in human plasma and urine using high-performance liquid chromatography. The reaction between galantamine and dansyl chloride was optimally realized in 30 min at room temperature and pH 10.5, with a reagent to galantamine molar ratio of 2.13. The derivative was extracted with dichloromethane, and the extract was dried under a nitrogen stream and dissolved in the mobile phase...
April 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28430242/thermally-stable-wleds-with-excellent-luminous-properties-by-screen-printing-a-patterned-phosphor-glass-layer-on-a-microstructured-glass-plate
#3
Yang Peng, Xing Guo, Ruixin Li, Hao Cheng, Mingxiang Chen
In order to improve the luminous properties and thermal reliability of white light-emitting diodes (WLEDs), we proposed a promising phosphor-in-glass (PiG) converter, which was prepared by screen-printing a patterned phosphor glass layer on a microstructured glass plate. The patterned layer achieves four-quadrant phosphor geometry based on separated yellow Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce<sup>3+</sup> (YAG:Ce<sup>3+</sup>) and red CaAlSiN<sub>3</sub>:Eu<sup>2+</sup> (CASN:Eu<sup>2+</sup>) phosphor parts...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429933/remarkably-enhancing-green-excitation-efficiency-for-solar-energy-utilization-red-phosphors-ba2zns3-eu-2-x-co-doped-halide-ions-x-cl-br-i
#4
Tingting Luo, Yun Du, Zhongxian Qiu, Yanmei Li, Xiaofang Wang, Wenli Zhou, Jilin Zhang, Liping Yu, Shixun Lian
Eu(2+)-activated Ba2ZnS3 has been reported as a red phosphor with a broad emission band peaking at 650 nm under blue excitation for white-LED. In this study, Ba2ZnS3:Eu(2+), X(-) (X = F, Cl, Br, I) phosphors doped with halide ions were prepared by traditional high-temperature solid-state reaction. Phase identification of powders was performed by X-ray powder diffraction analysis, confirming the existence of single-phase Ba2ZnS3 crystals without dopant. The corresponding excitation spectra showed an additional broad band in the green region peaking at 550 nm when the phosphor was halogenated except by the smallest F(-)...
April 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28427449/urolithiasis-analysis-in-a-multiethnic-population-at-a-tertiary-hospital-in-nairobi-kenya
#5
Francis K Wathigo, Alfred Hayombe, Daniel Maina
BACKGROUND: Urolithiasis is a global problem whose incidence is reported to be on the rise across the world. Previously, urolithiasis was reported as being rare among the indigenous African population but recent data suggest otherwise. This study reviewed the demographic and clinical characteristics of patients with urolithiasis seen at the Aga Khan University hospital Nairobi (AKUHN) as well as the chemical composition of the stones and the modalities of therapy used. METHODS: This was a retrospective study which utilized patients' clinical and laboratory records from 2013 to 2014...
April 20, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28426060/hierarchically-scaffolded-cop-cop2-nanoparticles-controllable-synthesis-and-their-application-as-a-well-matched-bifunctional-electrocatalyst-for-overall-water-splitting
#6
Wan Li, Shilin Zhang, Qining Fan, Fazhi Zhang, Sailong Xu
Transition metal phosphide (TMP) nanostructures have stimulated increasing interest for use in water splitting owing to their abundant natural sources and high activity for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Typically, the preparation of hierarchical TMPs involves the utilization of expensive or dangerous phosphorus sources, and, in particular, the understanding of topotactic transformations of the precursors to crystalline phases-which could be utilized to enhance electrocatalytic performance-remains very limited...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28425557/dual-spectra-band-emissive-eu-2-mn-2-co-activated-alkaline-earth-phosphates-for-indoor-plant-growth-novel-phosphor-converted-leds
#7
Young Jun Yun, Jin Kyu Kim, Ji Young Ju, Seul Ki Choi, Woon Ik Park, Jae Yong Suh, Ha-Kyun Jung, Yongseon Kim, Sungho Choi
This paper reports designing a novel single composition blue/red color illuminating phosphor followed by fabricating "smart" agricultural/horticultural LED lighting. Color-tunable Eu(2+)/Mn(2+) co-activated alkaline earth phosphates, Na(Sr,Ba)PO4 and Ca3Mg3(PO4)4, are considered, and the stable doping sites for the corresponding activators are identified by using first-principle DFT calculations. We can realize the designated color purity with stable thermal quenching preserved luminescence behavior is induced by the Eu(2+) center positioned at different coordination states with intermixed Sr(2+)/Ba(2+) sites in Na(Sr,Ba)PO4 hosts...
April 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28424719/comparative-analysis-of-root-traits-and-the-associated-qtls-for-maize-seedlings-grown-in-paper-roll-hydroponics-and-vermiculite-culture-system
#8
Zhigang Liu, Kun Gao, Shengchen Shan, Riling Gu, Zhangkui Wang, Eric J Craft, Guohua Mi, Lixing Yuan, Fanjun Chen
Root system architecture (RSA) plays an important role in the acquisition of both nitrogen (N) and phosphorus (P) from the environment. Currently RSA is rarely considered as criteria for selection to improve nutrient uptake efficiency in crop breeding. Under field conditions roots can be greatly influenced by uncontrolled environment factors. Therefore, it is necessary to develop fast selection methods for evaluating root traits of young seedlings in the lab which can then be related to high nutrient efficiency of adult plants in the field...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28424060/effects-of-a-combination-treatment-of-kd5040-and-l-dopa-in-a-mouse-model-of-parkinson-s-disease
#9
Sora Ahn, Taek-Jin Song, Seong-Uk Park, Songhee Jeon, Jongpil Kim, Joo-Young Oh, Jaehwan Jang, Sanhwa Hong, Min-A Song, Hye-Seoung Shin, Young-Rim Jung, Hi-Joon Park
BACKGROUND: Although the dopamine precursor L-3, 4-dihydroxyphenylalanine ( l -dopa) remains the gold standard pharmacological therapy for patients with Parkinson's disease (PD), long-term treatment with this drug has been known to result in several adverse effects, including l -dopa-induced dyskinesia (LID). Recently, our group reported that KD5040, a modified herbal remedy, had neuroprotective effects in both in vitro and in vivo models of PD. Thus, the present study investigated whether KD5040 would have synergistic effects with l -dopa and antidyskinetic effects caused by l -dopa as well...
April 19, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28422595/microleakage-of-sealants-after-phosphoric-acid-er-yag-laser-and-air-abrasion-enamel-conditioning-systematic-review-and-meta-analysis
#10
Ana Caroline Fumes, Daniele Lucca Longo, Andiara De Rossi, Tatiana Kelly da Silva Fidalgo, Francisco Wanderley Garcia de Paula E Silva, Maria Cristina Borsatto, Erika Calvano Küchler
PURPOSE: The aim of this systematic review and meta-analysis is to answer the focused question: Does the application of phosphoric acid, Er:YAG laser and air abrasion enamel conditioning methods previous to the oclusal sealant application in human permanent molars influence the microleakage? STUDY DESIGN: A literature research was carried out in the Pubmed Medline, Web of Science, Scopus and Cochrane databases using with the MeSH terms and keyword search strategy...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28422411/optical-properties-of-eu-2-eu-3-mixed-valence-phosphor-ca2-sio2-f2-eu-2-eu-3
#11
Mubiao Xie, Guoxian Zhu, Rongkai Pan, Wei Xie
The Eu(2+) /Eu(3+) mixed valence phosphor Ca2 SiO2 F2 :Eu(2+) /Eu(3+) was prepared using a solid-state reaction synthesis method in a CO atmosphere, and the optical properties were investigated. The spectroscopic properties revealed that Ca(2+) ions were occupied by both Eu(2+) and Eu(3+) ions in Ca2 SiO2 F2 , and both ions were able to generate their characteristic emissions. A broad 5d → 4f Eu(2+) band at ~470 nm and narrow 4f → 4f Eu(3+) peaks upon excitation with n-UV light were observed. The ratio between Eu(2+) and Eu(3+) emissions changed regularly, and the relative intensity of the red component from Eu(3+) became systematically stronger with increasing overall Eu content...
April 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28422045/sequential-reduction-of-the-silicon-single-electron-transistor-structure-to-atomic-scale
#12
Sarkis Dagesyan, Vladislav Shorokhov, Denis Presnov, Eugeniy Soldatov, Artem S Trifonov, Vladimir Krupenin
Here we present the original CMOS compatible fabrication method of the single-electron transistor structure with an extremely small islands, formed by solitary phosphorus dopants in the silicon nanobridge. Its key feature is the controllable size reduction of the nanobridge in sequential cycles of low energy isotropic reactive ion etching that results in a decreased number of active charge centers (dopants) in nanobridge from hundreds to single ones. Electron transport through the individual phosphorous dopants in the silicon lattice was studied...
April 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28421632/rigidly-tethered-bis-phosphoric-acids-generation-of-tunable-chiral-fluorescent-frameworks-and-unexpected-selectivity-for-the-detection-of-ferric-ions
#13
Frescilia Octa-Smolin, Raja Mitra, Maike Thiele, Constantin-Gabriel Daniliuc, Linda Stegemann, Cristian Strassert, Jochen Niemeyer
We describe the straightforward synthesis of a series of bis-phosphoric acids (R,R)-1a/b/c/d, featuring two chiral 1,1´-binaphthyl-phosphoric acid units which are tethered by rigid, π-conjugated linkers. The nature of the linker has a profound influence on the properties of the bis-phosphoric acids, such as their self-association behavior and their interaction with metal ions. This led to the identification of one preferred bis-phosphoric acid (R,R)-1d, which shows selective fluorescence quenching in the presence of ferric ions (Fe3+)...
April 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28421625/factors-affecting-platelet-concentration-in-platelet-concentrates-from-canine-blood-donors
#14
J S Raleigh, K E Jandrey, J Burges, M S Kent
BACKGROUND: Physiologic factors in dogs that might contribute to enhanced platelet yield in platelet concentrates (PCs) are largely unknown. OBJECTIVE: To determine whether individual differences in weight, age, preprocessing blood chemistry, and CBC variables predict the final platelet concentrations in PCs. Our hypotheses were (1) increased lipemic indices would be positively associated with increased platelet concentrations in PCs and (2) increased preprocessing platelet concentrations would be associated with higher platelet concentrations in the PCs...
April 19, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/28418674/reversing-enantioselectivity-using-noncovalent-interactions-in-asymmetric-dearomatization-of-%C3%AE-naphthols-the-power-of-3-3-substituents-in-chiral-phosphoric-acid-catalysts
#15
Avtar Changotra, Sandip Das, Raghavan B Sunoj
The sense of enantioselectivity in asymmetric dearomative amination of β-naphthols is reported to pivotally depend on the 3,3' substituents on the chiral BINOL-phosphoric acid (CPA) catalysts. The origin of reversal in the sense of stereoinduction from R to S, when the aryl substituent is changed from 3,5-(CF3)2-C6H3 (CPA-1) to 9-anthryl (CPA-2), has been identified as arising due to the change in the pattern of noncovalent interactions (from predominantly C-H···F to C-H···π interactions) in the stereocontrolling transition states...
April 18, 2017: Organic Letters
https://www.readbyqxmd.com/read/28418118/enantioselective-heck-matsuda-arylations-through-chiral-anion-phase-transfer-of-aryl-diazonium-salts
#16
Carolina M Avila, Jigar S Patel, Yernaidu Reddi, Masato Saito, Hosea M Nelson, Hunter P Shunatona, Matthew S Sigman, Raghavan B Sunoj, F Dean Toste
A mild, asymmetric Heck-Matsuda reaction of five-, six- and seven-membered ring alkenes and aryl diazonium salts is presented. High yields and enantioselectivities were achieved using Pd(0) and chiral anion co-catalysts, the latter functioning as a chiral anion phase-transfer (CAPT) reagent. For certain substrate classes, the chiral anion catalysts were modulated to minimize the formation of undesired by-products. More specifically, BINAM-derived phosphoric acid catalysts were shown to prevent alkene isomerization in cyclopentene and cycloheptene starting materials...
April 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28417832/color-vision-in-color-display-night-vision-goggles
#17
Eric P Liggins, William P Serle
INTRODUCTION: Aircrew viewing eyepiece-injected symbology on color display night vision goggles (CDNVGs) are performing a visual task involving color under highly unnatural viewing conditions. Their performance in discriminating different colors and responding to color cues is unknown. METHODS: Experimental laboratory measurements of 1) color discrimination and 2) visual search performance are reported under adaptation conditions representative of a CDNVG. Color discrimination was measured using a two-alternative forced choice (2AFC) paradigm that probes color space uniformly around a white point...
May 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28417327/influence-of-land-use-and-land-cover-on-the-spatial-variability-of-dissolved-organic-matter-in-multiple-aquatic-environments
#18
Shatrughan Singh, Padmanava Dash, Saurav Silwal, Gary Feng, Ardeshir Adeli, Robert J Moorhead
Water quality of lakes, estuaries, and coastal areas serves as an indicator of the overall health of aquatic ecosystems as well as the health of the terrestrial ecosystem that drains to the water body. Land use and land cover plays not only a significant role in controlling the quantity of the exported dissolved organic matter (DOM) but also influences the quality of DOM via various biogeochemical and biodegradation processes. We examined the characteristics and spatial distribution of DOM in five major lakes, in an estuary, and in the coastal waters of the Mississippi, USA, and investigated the influence of the land use and land cover of their watersheds on the DOM composition...
April 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28417116/a-long-persistence-phosphor-tailored-quasi-solid-state-dye-sensitized-solar-cell-that-generates-electricity-in-sunny-and-dark-weathers
#19
Qunwei Tang, Min Wang, Zhongling Wang, Weiyin Sun, Ruoxu Shang
An all-weather quasi-solid-state dye-sensitized solar cell is built using a long persistence phosphor tailored mesoscopic TiO2 photoanode and a three-dimensional conducting polymer gel electrolyte. The so-called all-weather solar cell yields a maximum efficiency of 28.7% in the dark, making a promising photovoltaic revolutionary for state-of-the-art photovoltaics.
April 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28414356/sensitivity-study-of-x-ray-luminescence-computed-tomography
#20
Michael C Lun, Wei Zhang, Changqing Li
X-ray luminescence computed tomography (XLCT) is a hybrid molecular imaging modality that combines the merits of both x-ray imaging (high resolution) and optical imaging (high sensitivity). In this study, we have evaluated the sensitivity of XLCT with phantom experiments by scanning targets of different phosphor concentrations at different depths. We found that XLCT is capable of imaging targets of very low concentrations (27.6 μM or 0.01 mg/mL) at significant depths, such as 21 mm. Our results demonstrate that there is little variation in the reconstructed target size with a maximum target size error of 4...
April 10, 2017: Applied Optics
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