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Phosphoric acid

Simon Flury, Anne Peutzfeldt, Patrick R Schmidlin, Adrian Lussi
PURPOSE: To compare various pre-treatments serving as cleaning procedures of dentin on the bond strength of resin composite promoted by a universal adhesive system applied either in the absence or presence of simulated pulpal pressure. MATERIALS AND METHODS: Prior to application of the adhesive system (Scotchbond Universal) and resin composite (Filtek Z250), ground dentin surfaces were given one of five pre-treatments either without or with simulated pulpal pressure: 1) no pre-treatment, adhesive system in "self-etch" mode, 2) phosphoric acid etching, adhesive system in "total-etch" mode, 3) polishing with pumice on prophylaxis cup, 4) air abrasion with AIR-FLOW PLUS powder, 5) air abrasion with AIR-FLOW PERIO powder; n = 20/group of pre-treatment...
2017: PloS One
David Eshar, Ady Y Gancz, Nili Avni-Magen, Effi Wagshal, Lisa M Pohlman, Mark A Mitchell
The sulcata or African spurred tortoise (Centrochelys sulcata) is a large tortoise species that is commonly kept in zoologic collections and as a pet. The objectives of this study were to establish reference intervals for selected biochemical analytes in clinically healthy captive sulcata tortoises and to evaluate the impact of blood sampling site and sex. Blood samples were collected from 60 tortoises from either the dorsal coccygeal (tail) vein or the subcarapacial venous plexus based on their body size. The packed cell volume and refractometric total solids (TS) were determined...
December 2016: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
Arun Suneja, Rajshekhar A Unhale, Vinod K Singh
An efficient route to pharmacologically interesting isoindolinone-based α-amino phosphonates is described via asymmetric hydrophosphonylation of in situ generated ketimines catalyzed by BINOL-derived phosphoric acid. The reaction proceeds smoothly at ambient temperature affording a variety of α-amino phosphonates with a quaternary stereogenic center embedded in isoindolinone motif in high yields with excellent enantiomeric ratios (up to 98.5:1.5 er). Several interesting transformations of the products into valuable synthetic intermediates are also depicted...
January 11, 2017: Organic Letters
Ayano Shinohara, Yohsuke Taira, Takashi Sawase
The present study was conducted to evaluate the effects of an experimental adhesive agent [methyl methacrylate-tributylborane liquid (MT)] and two adhesive agents containing silane on the bonding between a resin composite block of a computer-aided design and manufacturing (CAD/CAM) system and a light-curing resin composite veneering material. The surfaces of CAD/CAM resin composite specimens were ground with silicon-carbide paper, treated with phosphoric acid, and then primed with either one of the two silane agents [Scotchbond Universal Adhesive (SC) and GC Ceramic Primer II (GC)], no adhesive control (Cont), or one of three combinations (MT/SC, MT/GC, and MT/Cont)...
January 9, 2017: Odontology
Anwesha Bhowmik, Durbadal Ojha, Debayan Goswami, Rashmi Das, Nidhi S Chandra, Tapan K Chatterjee, Amit Chakravarty, Sudipa Chakravarty, Debprasad Chattopadhyay
Inositol hexa phosphoric acid (IP6) or Phytic acid, a natural antioxidant of some leguminous plants, known to act as a protective agent for seed storage in plants by suppressing iron catalyzed oxidative process. Following the same mechanism, we have tested the effect of IP6 on iron overloaded in vitro oxidative stress, and studied it's in vivo hepatoprotective ability in iron-dextran (injection)-induced iron overloaded liver injury in mice (intraperitoneal). Our results showed that IP6 had in vitro iron chelation (IC50 38...
January 6, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Adam P Smalley, James D Cuthbertson, Matthew J Gaunt
The design of an enantioselective Pd(II)-catalyzed enantioselective C-H amination reaction enabled by a comprehensive understanding of the reaction mechanism is described. The use of a chiral phosphoric acid ligand enables the conversion of readily available amines into synthetically valuable aziridines in high enantiomeric ratios. The aziridines can be derivatized to afford a range of chiral amine building blocks incorporating motifs readily encountered in pharmaceutically relevant molecules.
January 9, 2017: Journal of the American Chemical Society
Taku Michael Aida, Ryouma Maruta, Yuuhiko Tanabe, Minori Oshima, Toshiyuki Nonaka, Hiroki Kujiraoka, Yasuaki Kumagai, Masaki Ota, Iwane Suzuki, Makoto M Watanabe, Hiroshi Inomata, Richard L Smith
Defatted heterotrophic microalgae (Aurantiochytrium limacinum SR21) was treated with high temperature water (175-350°C, 10-90min) to obtain nitrogen and phosphorous nutrients as a water soluble fraction (WS). Yields of nitrogen and phosphorous recovered in WS varied from 38 to 100% and from 57 to 99%, respectively. Maximum yields of nitrogen containing compounds in WS were proteins (43%), amino acids (12%) and ammonia (60%) at treatment temperatures of 175, 250 and 350°C, respectively. Maximum yield of phosphorous in WS was 99% at a treatment temperature of 250°C...
December 24, 2016: Bioresource Technology
Shaun J Curtin, Peter Tiffin, Joseph Guhlin, Diana I Trujillo, Liana T Burghardt, Paul Atkins, Nicholas J Baltes, Roxanne Denny, Daniel F Voytas, Robert M Stupar, Nevin Dale Young
Genome wide association (GWA) studies offer the opportunity to identify genes that contribute to naturally occurring variation in quantitative traits. However, GWA relies exclusively on statistical association, so functional validation is necessary to make strong claims about gene function. We used a combination of gene-disruption platforms (Tnt1 retro-transposons, hairpin RNA-interference constructs, and CRISPR/Cas9 nucleases) together with randomized, well-replicated experiments to evaluate the function of genes that an earlier GWAS in Medicago truncatula had identified as candidates contributing to variation in the symbiosis between legumes and rhizobia...
January 5, 2017: Plant Physiology
Alexander D Braatz, Mark R Antonio, Mikael Nilsson
The coordination of the trivalent 4f ions, Ln = La(3+), Dy(3+), and Lu(3+), with neutral and acidic organophosphorus reagents, both individually and combined, was studied by use of X-ray absorption spectroscopy. These studies provide metrical information about the interatomic interactions between these cations and the ligands tri-n-butyl phosphate (TBP) and di-n-butyl phosphoric acid (HDBP), whose behavior are of practical importance to chemical separation processes that are currently used on an industrial scale...
January 5, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Tianli Wu, Mingyu Pi, Xiaodeng Wang, Dingke Zhang, Shijian Chen
Developing low-cost and highly-efficient non-precious metal bifunctional electrocatalysts towards the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is an attractively alternative strategy to solve the environmental pollution problems and energy demands. In this study, metal-organic framework (MOF) derived porous cobalt poly-phosphide (CoP3) concave polyhedrons are prepared and explored as superior bifunctional electrocatalysts for the HER and OER. The prepared MOF derived CoP3 concave polyhedrons show excellent electrocatalytic activity and stability towards the HER and OER in both acidic and alkaline media, with the Tafel slopes of 53 mV dec(-1) and 76 mV dec(-1) and a current density of 10 mA cm(-2) at the overpotentials of -78 and 343 mV for the HER and OER, respectively, which are remarkably superior to those of the transition metal phosphides (TMPs) and comparable to those of the commercial precious metal catalysts...
January 3, 2017: Physical Chemistry Chemical Physics: PCCP
Eike Jakubowitz, Louisa Liehn, Alexander Jahnke, Bernd Wöstmann, Markus Rickert, Thomas Niem
Aseptic loosening at alloy-cement interfaces constitutes a main failure mechanism of cemented total hip replacements (THR). As a potential solution we investigated the effect of metal primers containing phosphoric and phosphonic acid on shear bond strength (SBS) of bone cement to THR alloys (CoCrMo, TiAlNb) and pure tin (Sn) substrates (20×8×3 mm). Metal surfaces were modified by polishing or Al2O3 blasting and primer application. Substrates without primer treatment served as references. Cylindrical cement pins (Ø 5mm) were polymerised onto substrate surfaces and aging (1, 5, 14 and 150 days) was simulated in aqueous NaCl solution (0...
December 21, 2016: Journal of the Mechanical Behavior of Biomedical Materials
Kunneng Liang, Michael D Weir, Mark A Reynolds, Xuedong Zhou, Jiyao Li, Hockin H K Xu
The objectives of this study were to develop a novel method to remineralize dentin lesions, and investigate the remineralization effects of poly (amido amine) (PAMAM) dendrimer plus a bonding agent with nanoparticles of amorphous calcium phosphate (NACP) in a cyclic artificial saliva/lactic acid environment for the first time. Dentin lesions were produced via phosphoric acid. Four groups were tested: (1) dentin control, (2) dentin with PAMAM, (3) dentin with NACP bonding agent, and (4) dentin with PAMAM plus NACP bonding agent...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Fangming Wang, Zeyu Zhou, Wei Liu, Lei Zhou, Lizhuang Chen, Jing Li
Two luminescent metal-organic-frameworks (LMOFs) constructed by a molecular chromophore [tri(4-pyridylphenyl)amine] (tppa) were synthesized by solvothermal reactions and characterized by single crystal and powder X-ray diffraction, thermogravimetric analysis, optical diffuse reflection, photoluminescence spectroscopy, and internal quantum yield measurements. Both compound 1 [Zn(tppa)(ndc)·(DMF)4] and compound 2 [Zn4(tppa)2(sdc)3(NO3)2·(DMF)4·(ACN)2] (ndc = 2,6-naphthalenedicarboxylic acid, sdc = (E)-4,4'-(ethene-1,2-diyl)dibenzoic acid, DMF = dimethylformamide, ACN = acetonitrile) exhibit intense yellow emission under blue light (455 nm) excitation...
December 23, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Keren Cristina Fagundes Jordão-Basso, Milton Carlos Kuga, Matheus Coêlho Bandéca, Marco Antonio Hungaro Duarte, Flávia Angélica Guiotti
Endodontic sealer residues remaining within the pulp chamber dentin after root canal obturation and cleaning with various solvents may compromise the appearance and the durability of dental restorations. Acid etching is routinely performed prior to application of dentine adhesive systems, but is effect on residual sealer material and the optimal time-point for performing etching, are unknown. Here, we evaluated the effect of acid etching on the dentin surface when performed either immediately or 7 days after removal of the endodontic sealer with two solvents, i...
December 22, 2016: Brazilian Oral Research
Kyohhei Fujita, Shoji Fujiwara, Tatsuru Yamada, Yuji Tsuchido, Takeshi Hashimoto, Takashi Hayashita
In this study, we have developed a rational design strategy to obtain highly selective supramolecular recognition systems of cyclodextrins (CyDs) on the basis of the lock and key principle. We designed and synthesized dipicolylamine (dpa)-modified gamma-CyD-Cu2+ complexes possessing an azobenzene unit (Cu.1-gamma-CyD) and examined how they recognized phosphoric acid derivatives in water. The results revealed that Cu.1-gamma-CyD recognized ATP with high selectivity over other phosphoric acid derivatives. The significant blue shift in the UV-vis spectra and 1H NMR analysis suggested that the selective ATP recognition was based on the multipoint interactions between the adenine moiety of ATP and both the CyD cavity and the azobenzene unit in addition to the recognition of phosphoric moieties by the Cu-dpa complex site...
December 20, 2016: Journal of Organic Chemistry
Yan Shu, Kelin Li, Jinfeng Song, Bing Li, Chunfang Tang
In this study, Salix matsudana activated carbon (SAC) was prepared by phosphoric acid activation, and the adsorption characteristics of Cd(II) and Pb(II) on SAC in single- and double-component solutions were investigated. In both systems, the adsorption capacities of both ions on SAC increased with the increasing initial pH value and temperature in the solutions, and the adsorption equilibrium was approached at 10 min. The adsorption process was spontaneous, endothermic, and depicted well by the pseudo-second-order adsorption model, and the equilibrium adsorption fitted reasonably well with the Langmuir isotherm...
December 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Lu-Lu Li, Zhong-Lin Tao, Zhi-Yong Han, Liu-Zhu Gong
An enantioselective carbonyl allylation of aldehydes with simple alkenes has been achieved via a one-pot protocol consisting of a Pd-catalyzed allylic C-H borylation with bis(pinanediolato)diboron and a chiral Brønsted acid catalyzed asymmetric allylborylation, delivering homoallylic alcohols in high yields and with excellent diastereo- and enantioselectivities. The double chiral induction of chiral allylic borate and chiral phosphoric acid allows the reaction to give excellent stereoselectivities.
December 20, 2016: Organic Letters
Bhuvan Shome Venigalla, Pinnamreddy Jyothi, Shekhar Kamishetty, Smitha Reddy, Ravi Chandra Cherukupalli, Depa Arun Reddy
CONTEXT: Resin-dentin bonds are unstable owing to hydrolytic and enzymatic degradation. Several approaches such as collagen cross-linking and ethanol-wet bonding (EWB) have been developed to overcome this problem. Collagen cross-linking improves the intrinsic properties of the collagen matrix. However, it leaves a water-rich collagen matrix with incomplete resin infiltration making it susceptible to fatigue degradation. Since EWB is expected to overcome the drawbacks of water-wet bonding (WWB), a combination of collagen cross-linking with EWB was tested...
November 2016: Journal of Conservative Dentistry: JCD
Xiaoyu Yang, F Dean Toste
We describe the asymmetric addition of unactivated α-branched cyclic ketones to allenamides catalyzed by a chiral phosphoric acid, generating an all-carbon quaternary stereocenter with broad substrate scope and high enantioselectivity. The products are easily transformed into their corresponding 1,5- and 1,4-ketoaldehyde derivatives, which are both important building blocks in organic synthesis.
2016: Chemical Science
Xiangping Chen, Hongrui Ma, Chuanbao Luo, Tao Zhou
Sustainable recycling of valuable metals from spent lithium-ion batteries (LIBs) may be necessary to alleviate the depletion of strategic metal resources and potential risk of environmental pollution. Herein a hydrometallurgical process was proposed to explore the possibility for the recovery of valuable metals from the cathode materials (LiCoO2) of spent LIBs using phosphoric acid as both leaching and precipitating agent under mild leaching conditions. According to the leaching results, over 99% Co can be separated and recovered as Co3(PO4)2 in a short-cut process involved merely with leaching and filtrating, under the optimized leaching conditions of 40°C (T), 60min (t), 4 vol...
December 12, 2016: Journal of Hazardous Materials
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