phosphoric acid/atrofie

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Phosphoric acid catalyzed enantioselective transfer hydrogenation of imines: a density functional theory study of reaction mechanism and the origins of enantioselectivity.

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The phosphoric acid catalyzed reaction of 1,4-dihydropyridines with N-arylimines has been investigated by using density functional theory. We first considered the reaction of acetophenone PMP-imine (PMP=p-methoxyphenyl) with the dimethyl Hantzsch ester catalyzed by diphenyl phosphate. Our study

Chiral phosphoric acid-catalyzed enantioselective three-component Povarov reaction using enecarbamates as dienophiles: highly diastereo- and enantioselective synthesis of substituted 4-aminotetrahydroquinolines.

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A chiral phosphoric acid (5)-catalyzed three-component Povarov reaction of aldehydes 2, anilines 3, and enecarbamates 4 afforded cis-4-amino-2-aryl(alkyl)-1,2,3,4-tetrahydroquinolines 1 in high yields with excellent diastereoselectivities (>95%) and almost complete enantioselectivities (up to >99%

Comparison of tris(2-ethylhexyl) phosphate and di(2-ethylhexyl) phosphoric acid toxicities in a rat 28-day oral exposure study.

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Tris(2-ethylhexyl) phosphate (TEHP, CAS no. 78-42-2) is a plasticizer and a flame retardant, while di(2-ethylhexyl) phosphoric acid (DEHPA, CAS no. 298-07-7) is an oil additive and extraction solvent. Publicly-available information on repeated exposure to these two related organophosphate compounds

Heat deterioration of phospholipids. VI. Clarification of mechanism for the new pseudo Maillard rearrangement reaction by using 2-aminoethyl dihydrogenphosphate.

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2,3-Dihydro-1H-imidazo[1,2-a]pyridine-4-ylium derivatives with UV absorption at 350 nm were formed by reaction of one molar of any sugar except 2-deoxysugars with two molar of phosphatidylethanolamines involving a new pseudo Maillard rearrangement reaction. To elucidate the reaction mechanism,

[Studies on the yield and quality of alfalfa varieties].

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The correlations found between yield and content of several varieties of alfalfa show that selection for green matter only does not result in the deterioration of fodder quality. Green matter variability has more influence on the yield of dry matter, crude protein, and phosphoric acid than does the

A study on biomineralization behavior of N-methylene phosphochitosan scaffolds.

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Biomimetic growth of calcium phosphate over natural polymer may be an effective approach to constituting an organic/inorganic composite scaffold for bone tissue engineering. In this work, N-methylene phosphochitosan (NMPCS) was prepared via formaldehyde addition and condensation with phosphoric acid

Preparation, Test, and Analysis of a Novel Aluminosilicate-Based Antimildew Agent Applied on the Microporous Structure of Wood.

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Fungi play a considerable role in the deterioration of lignocellulose materials, as their activities either affect the esthetic properties or lead to decay of the host materials. The new generation of organic-inorganic preservatives, which are copper-based but chrome- and arsenic-free, is a subject

The effect of different soft drinks on the shear bond strength of orthodontic brackets.

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OBJECTIVE It is proved that acidic soft drinks that are commonly used, have an adverse effect on dental structures, and may deteriorate oral heath of our patients and orthodontic appliances. The aim of this study was to compare the effect of yoghurt drink with other soft drinks on the shear bond

Endoglucanase I from the edible straw mushroom, Volvariella volvacea. Purification, characterization, cloning and expression.

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We isolated an endoglucanase, EG1, from culture fluid of Volvariella volvacea grown on crystalline cellulose by ion-exchange and gel filtration chromatography, and preparative PAGE. EG1 has a molecular mass of 42 kDa as determined by SDS/PAGE and an isoelectric point of 7.7. Enzyme-catalysed

Critical appraisal. Dentin bonding: matrix metalloproteinases and chlorhexidine.

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Contemporary resin-dentin bonding is initiated by systems that use phosphoric acid or acidic resin monomers to remove mineral, exposing the superficial dentin collagen matrix. Collagen-associated proteins, including enzymes known as matrix metalloproteinases (MMPs), also are exposed. The collagen

Treatment of surface contamination of lithium disilicate ceramic before adhesive luting.

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To evaluate the effect of different contamination media and cleaning regimens on the adhesion of resin cement to lithium disilicate ceramic.Specimens (IPS e.max CAD) (n =15 per group) were etched with 5% hydrofluoric acid gel. While half of the specimens

Toxicology of mono-, di-, and triethanolamine.

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The chemistry, biochemistry, toxicity, and industrial use of monoethanolamine (MEA), diethanolamine (DEA), and triethanolamine (TEA) are reviewed. The dual function groups, amino and hydroxyl, make them useful in cutting fluids and as intermediates in the production of surfactants, soaps, salts,

Anti-proteolytic property and bonding durability of mussel adhesive protein-modified dentin adhesive interface.

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To evaluate the effect of mussel adhesive protein (MAP) on collagenase activity, dentin collagen degradation and microtensile dentin bond strength (μTBS). Three groups were designed: 1. experimental group: treated with MAP; 2. positive control: treated with GM6001 (collagenase-inhibitor); 3.

An evaluation by scanning electron microscopy of small dental cutting instruments through use and cleaning.

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The progressive status of some selected small dental cutting instruments was examined from the time of their unpackaging through routine institutionalized cleaning and sterilizing procedures both before and after first and subsequent use. The cleaning protocol in place at the time involved a

Improved Durability and Sensitivity of Bitterness-Sensing Membrane for Medicines.

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This paper reports the improvement of a bitterness sensor based on a lipid polymer membrane consisting of phosphoric acid di-n-decyl ester (PADE) as a lipid and bis(1-butylpentyl) adipate (BBPA) and tributyl o-acetylcitrate (TBAC) as plasticizers. Although the commercialized bitterness sensor (BT0)

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