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styrene/carie dentaria
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Pagina 1 a partire dal 86 risultati
Controlling photochemical geometric isomerization of a stilbene and dimerization of a styrene using a confined reaction cavity in water.
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Utility of a water-soluble deep cavity cavitand, octa acid, as a reaction medium is illustrated by carrying out photochemical reactions of a stilbene and a styrene included within the octa acid in water. Geometric isomerization of trans-4,4'-dimethyl stilbene is restricted while dimerization of
Mutations at the putative active cavity of styrene monooxygenase: enhanced activity and reversed enantioselectivity.
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Styrene monooxygenase (SMO) catalyzes the first step of styrene degradation, and also serves as an important enzyme for the synthesis of enantiopure epoxides. To enhance its activity, molecular docking of styrene was performed based on the X-ray crystal structure of the oxygenase subunit of SMO to
Control of physicochemical properties and catalytic activity of tris(2,2'-bipyridine)iron(II) encapsulated within the zeolite Y cavity by alkaline earth metal cations.
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A series of materials containing the tris(2,2'-bipyridine)iron(ii) (Fe(bpy)3(2+)) complex inside zeolite Y cavities with alkaline earth metals (Mg(2+), Ca(2+), Sr(2+), Ba(2+)) as charge compensating cations have been synthesized via a "ship in the bottle" method. The influence of the alkaline earth
Styrene Purification by Guest-Induced Restructuring of Pillar[6]arene.
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The separation of styrene (St) and ethylbenzene (EB) mixtures is important in the chemical industry. Here, we explore the St and EB adsorption selectivity of two pillar-shaped macrocyclic pillar[n]arenes (EtP5 and EtP6; n = 5 and 6). Both crystalline and amorphous EtP6 can capture St from a St-EB
"Supramolecular" amphiphiles created by wrapping poly(styrene) with the helix-forming beta-1,3-glucan polysaccharide.
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We have demonstrated that giant polymer micelles with a uniform diameter (ca. 200 nm) can be fabricated by "supramolecular wrapping" of poly(styrene) (PS) with the beta-1,3-glucan polysaccharide, with the beta-1,3-glucan fastening the PS chains together in a noncovalent fashion to facilitate the
Synthesis of hollow CaCO3 nanospheres templated by micelles of poly(styrene-b-acrylic acid-b-ethylene glycol) in aqueous solutions.
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An asymmetric triblock copolymer, poly(styrene-b-acrylic acid-b-ethylene glycol) (PS-b-PAA-b-PEG), was synthesized via reversible addition-fragmentation chain transfer controlled radical polymerization. Micelles of PS-b-PAA-b-PEG with PS core, PAA shell, and PEG corona were then prepared in aqueous
[Studies on three-dimensional configuration of diaphragmatic lymphatics and absorptive mechanism of lymph from the peritoneal cavity].
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Three-dimensional configuration of diaphragmatic lymphatics in five fetuses was studied by the lymphatic casts of scanning electron microscope and transmission electron microscope. A new resin, PAES-3, prepared by piperylene, acrylic ester and styrene was used instead of Mercox. The diaphragmatic
Hybrid Photonic Cavity with Metal-Organic Framework Coatings for the Ultra-Sensitive Detection of Volatile Organic Compounds with High Immunity to Humidity.
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Detection of volatile organic compounds (VOCs) at parts-per-billion (ppb) level is one of the most challenging tasks for miniature gas sensors because of the high requirement on sensitivity and the possible interference from moisture. Herein, for the first time, we present a novel platform based on
Rational Design of a 3D MnII -Metal-Organic Framework Based on a Nonmetallated Porphyrin Linker for Selective Capture of CO2 and One-Pot Synthesis of Styrene Carbonates.
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A 3D MnII -porphyrin metal-organic framework (MOF), [{Mn2 (TCPP)⋅2H2 O}⋅DMF]n (MOF1) (TCPP=5,10,15,20-tetrakis(4-benzoate)porphyrin), was constructed; it exhibits an interesting 3D framework structure with two types of 1D channels of dimensions of 3.94×8.37 Å2 and 4.66×4.93 Å2 running along the
Molecular docking study for the prediction of enantiodifferentiation of chiral styrene oxides by octakis(2,3-di-O-acetyl-6-O-tert-butyldimethylsilyl)-gamma-cyclodextrin.
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A molecular docking study, using molecular mechanics calculations with AutoDock and semi-empirical PM3 calculations, was used to help predict the enantiodiscrimination of mono-substituted styrene oxides by octakis(2,3-di-O-acetyl-6-O-tert-butyldimethylsilyl)-gamma-cyclodextrin (DIACTGCD), through
Measuring performance of a half-mask respirator in a styrene environment.
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A workplace protection factor (WPF) study was conducted with a half-mask air-purifying respirator during fiber glass boat production. Styrene was the measured analyte, and the geometric mean WPF found was 39.7. Analytical detection limits, sample contamination, and pulmonary elimination from
Enhancing the hydrostability and processability of metal-organic polyhedra by self-polymerization or copolymerization with styrene.
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Metal-organic polyhedra (MOPs) have attracted considerable research interest due to their unique cavity structure and fascinating physicochemical properties. However, their poor hydrostability and low processability hinder their applications seriously. Here we report a polymerization strategy
Use of styrene radical cations as probes for the complexation dynamics of charged guests with alpha- and beta-cyclodextrins.
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The complexation dynamics of radical cations with cyclodextrins (CD) was studied using photophysical techniques. Radical cations of 4-vinylanisole and trans-anethole were formed within alpha- and beta-CD cavities by two-photon photolysis of the respective styrene precursors. Exit of the radical
Micelles of poly(styrene-b-2-vinylpyridine-b-ethylene oxide) with blended polystyrene core and their application to the synthesis of hollow silica nanospheres.
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Core-shell-corona (CSC) micelles of asymmetric triblock copolymer, poly(styrene-b-2-vinylpyridine-b-ethylene oxide) (PS-PVP-PEO), containing polystyrene homopolymer (homo-PS) in the core were successfully prepared in aqueous media. The influence of homo-PS contents over the formation of the micelles
Cancer Incidence in Workers Exposed to Styrene in the Danish-reinforced Plastics Industry, 1968-2012.
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Occupational exposure to styrene is widespread and has been suggested to be carcinogenic. The aim of this study was to investigate whether occupational exposure to styrene increases the risk of cancer, in particular lymphohematopoietic cancers.
We established a study population of 72,292 workers
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