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Phosphoric acid

Pinar Cevik, Oguz Eraslan, Kursat Eser, Suleyman Tekeli
PURPOSE: The aim of this study was to evaluate the effect of six different surface conditioning methods on the shear bond strength of ceramic brackets bonded to feldspathic porcelain. MATERIALS AND METHODS: A total of 60 feldspathic porcelain disks were fabricated and divided into six subgroups including 10 specimens in each. Specimens were first treated one of the following surface conditioning methods, namely, 37% phosphoric acid (G-H3PO4), 9.4% hydrofluoric acid (G-HF), grinding with diamond burs (G-Grinding), Nd:YAG laser (G-Nd:YAG), Airborne-particle abrasion (G-Abrasion)...
March 2018: International Journal of Artificial Organs
Tatsuru Yamada, Shoji Fujiwara, Kyohhei Fujita, Yuji Tsuchido, Takeshi Hashimoto, Takashi Hayashita
The construction of supramolecular recognition systems based on specific host-guest interactions has been studied in order to design selective chemical sensors. In this study, guest-responsive receptors for ATP have been designed with cyclodextrins (CyDs) as a basic prototype of the turn-on type fluorescent indicator. We synthesized dipicolylamine (DPA)-modified CyD-Cu2+ complexes ( Cu·1 α , Cu·1 β , and Cu·1 γ ), and evaluated their recognition capabilities toward phosphoric acid derivatives in water...
March 12, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Liuzhu Gong, Lu-Lu Li, Yong-Liang Su, Zhi-Yong Han
An efficient synthesis of highly enantioenriched tetrahydropyrans from readily available aldehydes, allylboronates and syngas has been established by multiply relay catalysis of rhodium and chiral phosphoric acid. The cascade reaction integrates the asymmetric allylboration of aldehydes and alkene hydroformylation, providing structurally diverse range of products with different workup procedures. The concise synthesis of key chiral building blocks to access herboxidiene and leucascandrolide A demonstrates the high synthetic utility of this method...
March 12, 2018: Chemistry: a European Journal
Zhu Liang, Wei Bu, Karl J Schweighofer, David J Walwark, Jeffrey S Harvey, Glenn R Hanlon, Daniel Amoanu, Cem Erol, Ilan Benjamin, Mark L Schlossman
During solvent extraction, amphiphilic extractants assist the transport of metal ions across the liquid-liquid interface between an aqueous ionic solution and an organic solvent. Investigations of the role of the interface in ion transport challenge our ability to probe fast molecular processes at liquid-liquid interfaces on nanometer-length scales. Recent development of a thermal switch for solvent extraction has addressed this challenge, which has led to the characterization by X-ray surface scattering of interfacial intermediate states in the extraction process...
March 12, 2018: Proceedings of the National Academy of Sciences of the United States of America
Biow Ing Sim, Halimah Muhamad, Oi Ming Lai, Faridah Abas, Chee Beng Yeoh, Imededdine Arbi Nehdi, Yih Phing Khor, Chin Ping Tan
This paper examines the interactions of degumming and bleaching processes as well as their influences on the formation of 3-monochloropropane-1,2-diol esters (3-MCPDE) and glycidyl esters in refined, bleached and deodorized palm oil by using D-optimal design. Water degumming effectively reduced the 3-MCPDE content up to 50%. Acid activated bleaching earth had a greater effect on 3-MCPDE reduction compared to natural bleaching earth and acid activated bleaching earth with neutral pH, indicating that performance and adsorption capacities of bleaching earth are the predominant factors in the removal of esters, rather than its acidity profile...
March 9, 2018: Journal of Oleo Science
Ayse Betul Ergul, Mehmet Kara, Cigdem Karakukcu, Arzu Tasdemir, Humeyra Aslaner, Mehmet Ali Ergul, Sebahattin Muhtaroglu, Gozde Erturk Zararsiz, Yasemin Altuner Torun
Boron plays roles in the metabolism of calcium, vitamin D, steroid hormones, healthy bone development, and maintenance of cell membranes. The biological effects of boron are dose-dependent but follow a U-shaped pattern, rendering it important to define the active range. The studies of Bahadoran et al. on rats and Naghii et al. on humans showed that low doses of boron (3 and 10 mg/day) prevented kidney stone formation. The aim of this study was to determine whether high doses of boron have an anti-urolithiatic or antioxidant effect on nephrolithiasis in an experimental rat model...
March 8, 2018: Biological Trace Element Research
Thomas F McDaniel, Thomas W Sigrist, Gary M Johnson
Several manufacturers produce devices designed to warm composite resins used in restorative dentistry. Previous investigators have examined the effects of heating composite restorative resins prior to placement and polymerization. Heating has been reported to reduce viscosity, improve ease of placement, enhance monomer conversion, and reduce microleakage. The aim of the present study was to compare shear bond strengths of room temperature (22°C) and prewarmed (54°C) restorative composite resin. Extracted bovine mandibular incisors were sectioned sagittally and embedded in acrylic cylinders...
March 2018: General Dentistry
Yong-Hyun Ko, Sun Yeou Kim, Seok-Yong Lee, Choon-Gon Jang
Daidzein is one of the major isoflavones found in soy food and plants. Following ingestion, daidzein is readily converted to hydroxylated metabolites in the human body. 6,7,4'-Trihydroxyisoflavone (THIF), one of the metabolites of daidzein, has several pharmacological activities, including anti-cancer and anti-obesity properties. However, no reports exist on the effects of 6,7,4'-THIF for cognitive function in mice. The present study aimed to investigate the effects of 6,7,4'-THIF against scopolamine-induced learning and memory impairments using the Y-maze and passive avoidance test...
March 3, 2018: European Journal of Pharmacology
Moustafa N Aboushelib, Hala Ragab, Mohamed Arnaot
PURPOSE: To evaluate the influence of different aging techniques on zirconia-composite microtensile bond strength using different surface treatments over a 5-year follow-up period. MATERIALS AND METHODS: Zirconia disks received three surface treatments: airborne-particle abrasion with 50-μm aluminum oxide particles, selective infiltration etching (SIE), or fusion sputtering (FS). The specimens were bonded to pre-aged composite disks using a composite cement containing phosphate monomers (Panavia F2...
2018: Journal of Adhesive Dentistry
Y B Lou, F X Fan, Y C Mu, X Dong
The aim of this study was to analyze metabolite differences in pancreatic cancer and diabetic patients, to better diagnose these diseases. Gas chromatography-mass spectrometry was used to evaluate the metabolomic differences in blood samples of 50 pancreatic patients, 50 diabetic patients and 50 healthy people. Metabonomic data was analyzed with primary component analysis and discriminant analysis. The results show that pancreatic cancer patients, diabetic patients and healthy people can have significantly distinct metabolite profiles...
January 2018: Journal of Biological Regulators and Homeostatic Agents
Hamid Reza Mahdavi, Mehran Arzani, Mojgan Isanejad, Toraj Mohammadi
Cationic dyes mixture pertraction experiments of Rhodamine B (RhB) and Methylene Blue (MB) using a flat sheet supported liquid membrane (SLM) were performed. Mono-(2-etylhexyl) ester of phosphoric acid (M2EHPA) and bis-(2-etylhexyl) ester of phosphoric acid (D2EHPA) mixture was used as carrier and Sesame oil to dilute the carrier due to its very high viscosity. Acetic acid (AA) was also used as stripper phase. Influences of hydrophobic and hydrophilic nanoparticles were loaded in a carrier at different loadings (from 0 to 6 mg mL-1 ) on dyes pertraction at constant operating conditions were investigated...
March 1, 2018: Journal of Environmental Management
Sara AlKetbi, Hussain ElSayed, Sulaiman Al-Zuhair
Treatment of municipal wastewater, which involves multiple steps, produces large amounts of bio-solid sludge, which is either incinerated or disposed in landfills. This sludge contains carbon, nitrogen, and phosphorous in appreciable amounts, and hence, it is being recently suggested that it should be used as a fertilizer. However, the bio-solid sludge also contains large amounts of heavy metals, which exert harmful effects on the plantation, and therefore, they must be removed before it can be used as a fertilizer...
March 1, 2018: Environmental Technology
Yan-Mei Gou, Shi-Hong Zhong, Rui Gu, Can Zhao, Chun-Sheng Yang
To establish a method for simultaneous determination of the contents of sesamoside, menthyl chloride, chlorogenic acid, caffeic acid, 8-O-acetyl-phloridzin methyl ester, forsythiaside B, luteolin, and ergosterol, the LIPLC analysis was performed on a Kinetex XB-C₁₈ (4.6 mm×50 mm,2.6 μm)column with acetonitrile (A)-0.1% phosphoric acid solution (B) as the mobile phase. The flow rate is 1.0 mL min⁻¹. The detection wavelength was 238, 320 and 350 nm and column temperature was 30 ℃. The results showed that the eight components could be completely separated with good linear relationships (r≥0...
December 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Carla Regina Bianchi Codo, Jamil Pedro de Siqueira Caldas, Rafaella Regina Alves Peixoto, Vitor Lacerda Sanches, Tamara Cristina Guiraldelo, Solange Cadore, Sérgio Tadeu Martins Marba
OBJECTIVE: To determine and compare the concentrations of electrolytes and minerals in three different types of maternal milk samples: term donor milk before pasteurization, term donor milk after pasteurization and raw milk of mothers of preterm newborns at bedside. METHODS: Descriptive cross-sectional study. Concentrations of calcium (Ca), phosphorous (P), magnesium (Mg), sodium (Na) and potassium (K) were measured in random samples of three human breast milk groups...
February 22, 2018: Revista Paulista de Pediatria: Orgão Oficial da Sociedade de Pediatria de São Paulo
Fahad Alkhudhairy, Mustafa Naseem, Mohammed Bin-Shuwaish, Fahim Vohra
The aim was to evaluate the influence of Er, Cr: YSGG laser therapy at different pulse frequency and power levels on the bond strength and microleakage of bleached enamel. One hundred samples were bleached using in-office whitening agent. Bleached samples were divided into six subgroups, four subgroups was based on laser application parameters (pulse frequency 50 and 30 Hz; Power 4.5 & 6 W) one subgroup was treated with bleach (B) and the other was control (no bleaching, no laser application). All specimens including control were etched with 37% phosphoric acid and composite build-ups were performed...
February 24, 2018: Photodiagnosis and Photodynamic Therapy
Priyanka Khati, Parul, Pankaj Bhatt, Nisha, Rajeew Kumar, Anita Sharma
Plant growth promoting rhizobacteria are key to soil and plant health maintenance. In the present study, two PGPR strains which were identified as Bacillus spp. (accession number KX650178 and KX650179) with nanozeolite (50 ppm) were applied to the seeds in different combinations and tested on growth profile of maize crop. Various growth related parameters, including plant height, leaf area, number of leaves chlorophyll and total protein were positively increased up to twofold by the nanocompound treatment...
March 2018: 3 Biotech
Thaiene Avila Reis, Ana Elise Jaculi, Rubens da Costa Alves, Tais Gratieri, Ricardo Bentes Azevedo, Graziella Anselmo Joanitti, Guilherme Martins Gelfuso, Marcilio Cunha-Filho
Considering the feasibility of the aluminum phthalocyanine chloride (AlPcCl) application in the topical photodynamic therapy of cutaneous tumors and the lack of HPLC methods capable of supporting skin permeation experiments using this compound, the aim of this study was to obtain a simple and selective chromatographic method for AlPcCl determination in skin matrices. A HPLC-UV/Vis method was developed using a normal-phase column operating at 30°C, an isocratic mobile phase of methanol : phosphoric acid (0...
2018: Journal of Analytical Methods in Chemistry
Y T Dong, F C Tian, B Jia, B Zu, X Y Wang
OBJECTIVE: To investigate influence of setting time on bond strength of different bioactive pulp capping materials with self-etch or etch-and-rinse adhesive. METHODS: Sixty specimens were prepared for each of the three tested capping materials, namely mineral trioxide aggregate (MTA), iRoot BP Plus (BP) and iRoot FS (FS). Specimens of each material were divided into three groups and bonded at three setting time points of the materials respectively: initial setting time (4 h for MTA, 2 h for BP and 20 min for FS), 24 h after application and 7 d after application...
February 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Hai-Xia Lin, Ming-Sheng Yang, Chao Tian, Chun-Rui Han, Jie Song, Jiu-Fang Duan, Jian-Xin Jiang
A novel rosin-based ester tertiary amine (RETA) with three hydrophilic groups and a rigid hydrophobic group was synthesized from rosin by Diels-Alder addition, acylation and esterification reactions. RETA was characterized by infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance spectroscopy (13 C NMR). Results from testing surface tension, zeta potential, and transmission electron spectroscopy showed that RETA had unique pH responsiveness. RETA self-assembled into worm-like micelles, spherical micelles 130 nm in diameter and big spherical worm-like aggregates with diameter of 2 μm at pH = 5...
January 31, 2018: Colloids and Surfaces. B, Biointerfaces
Xiaodong Yao, Naili Zhang, Hui Zeng, Wei Wang
Although the patterns and drivers of soil microbial community composition are well studied, little is known about the effects of plant-soil interactions and soil depth on soil microbial distribution at a regional scale. We examined 195 soil samples from 13 sites along a climatic transect in the temperate grasslands of northern China to measure the composition of and factors influencing soil microbial communities within a 1-m soil profile. Soil microbial community composition was measured using phospholipid fatty acids (PLFA) analysis...
February 20, 2018: Science of the Total Environment
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