Search results for "CEM"

Acylative Dynamic Kinetic Resolution of Secondary Alcohols: Tandem Catalysis by HyperBTM and Bäckvall's Ruthenium Complex.

2021

Non-enzymatic dynamic kinetic resolution (DKR) of secondary alcohols by enantioselective acylation using an isothiourea-derived HyperBTM catalyst and racemization of slowly reacting alcohol by Backvall's ruthenium complex is reported. The DKR approach features high enantioselectivities (up to 99:1), employs easy-to-handle crystalline 4-nitrophenyl isobutyrate as the acylating reagent, and proceeds at room temperature and under an ambient atmosphere. The stereoinduction model featuring cation-π system interactions between the acylated HyperBTM catalyst and π electrons of an alcohol aryl subunit has been elaborated by DFT calculations.

Difference in the behavior of methyl (S)-?-bromopropionate in its addition to trimethylvinylsilane depending on the method of initiation

1996

The addition of methyl (S)-2-bromopropionate to trimethylvinylsilane initiated by systems based on iron pentacarbonyl affords a racemic adduct and is accompanied by racemization of the unreacted chiral ester. In the presence of benzoyl peroxide, the reaction proceeds similarly, but no racemization of the starting chiral ester occurs.

Infiltrazione marginale di tre diversi sistemi di cementazione per inlay in composito: Analisi comparativa in vitro.

2007

Developing placement assessment in integration training for adult migrants in Finland

2017

As part of integration training in Finland, migrants are provided with Finnish or Swedish language courses. The linguistic objective is to provide migrants with the basic language skills required in daily life. To find the most suitable teaching group for learners in integration training, a placement assessment is carried out. This includes assessment of learners’ current proficiency level in the target language and study skills/experience. In this article we describe a project to develop a national test system for placement assessment (see Ohranen et al. 2015). En Finlande, des migrants adultes suivent des cours de finnois ou de suédois dans le cadre d’une formation pour l’intégration. L’o…

In Vitro and In Vivo Regulation of SRD5A mRNA Expression of Supercritical Carbon Dioxide Extract from Asparagus racemosus Willd. Root as Anti-Sebum a…

2022

Oily skin from overactive sebaceous glands affects self-confidence and personality. There is report of an association between steroid 5-alpha reductase gene (SRD5A) expression and facial sebum production. There is no study of the effect of Asparagus racemosus Willd. root extract on the regulation of SRD5A mRNA expression and anti-sebum efficacy. This study extracted A. racemosus using the supercritical carbon dioxide fluid technique with ethanol and investigated its biological compounds and activities. The A. racemosus root extract had a high content of polyphenolic compounds, including quercetin, naringenin, and p-coumaric acid, and DPPH scavenging activity comparable to that of the standa…

Cognitive-Behavioural Treatment Package for Teaching Grooming Skills to a Man with an Intellectual Disability

2000

A combination of health education, use of picture cues based on task analyses, a system of least prompts and social reinforcement was applied to teach various grooming skills to a man with a moderate intellectual disability. A multiple baseline design across behaviours was employed to show the effects. The results indicated rapid learning of lacking skills such as tooth brushing, shaving, showering and washing of arms and face.

Simulation of Fatigue Delamination Growth in Composites with Different Mode Mixtures

2007

A numerical model, obtained by implementing a cyclic damage model in the framework of an interface element, is here proposed to reproduce the crack growth in laminated composites subjected to cyclically repeated loads. This model, which differs from the few studies in the literature on the topic, applies not only to single fracture modes but also to mixed modes, and to constant or variable crack growth rates. The applied load (in terms of force or displacement) is assumed to oscillate between a minimum and a maximum constant value. The Paris curve can be reproduced with accuracy once some parameters in the numerical model are tuned with experiments. These parameters are preliminarily found…

Effective reference and current integration for large displacement interface

2016

The most common interface formulations proposed in literature are generally based on the restrictive hypothesis of small strains and small displacements and, even though their application to geometrically nonlinear problems is of paramount interest, only few contributions are available in literature. Motivations are probably due to the difficulties encountered on such formulation, as already mentioned by several authors. A pioneering formulation is the finite displacement three-dimensional interface developed by Ortiz and Pandolfi in [1], where normal and tangential traction components are evaluated with respect to the middle surface in the current configuration, producing a non-symmetric g…

Intervención psicoeducativa en una niña de educación infantil diagnosticada de una leucemia linfoblástica

2002

Se ofrecen los resultados de un programa de intervención psicoeducativa de una niña de 2º curso de Educación Primaria afectada de una leucemia linfoblástica aguda. El programa de intervención psicoeducativa fue desarrollado por la maestra tutora y se realizó exclusivamente en el aula ordinaria, sin la intervención directa del aula de apoyo ni de la maestra de educación especial, aunque ésta colaboró proporcionado materiales. Este caso forma parte de un trabajo de investigación más amplio que, bajo el título de “Intervención psicoeducativa en niños diagnosticados de cáncer”, se ha realizado con la financiación de la Conselleria de Cultura y Educación de la Generalidad Valenciana (GV99-97-1-0…

Spaghetti Enriched with Inulin: Effect of Polymerization Degree on Quality Traits and α-Amylase Inhibition.

2022

Inulin is considered a dietary fiber and represents a noteworthy ingredient for food biofortification due to its health effects and its neutral taste. The aim of the work was the evaluation of the quality of pasta produced using whole-meal flours of two ancient Sicilian landraces (Senatore Cappelli-CAP and Timilia—TIM) fortified with two types of inulin (long-chain topinambur inulin IT and low-chain chicory inulin IC), at two different levels of substitution (2 and 4%) to evaluate its possible effect on α-amylase inhibition. The color indices L* and a* were mainly influenced by cultivars, while IT improved the sensory attributes, mainly the elasticity sensation, and influenced l…