Search results for "Llar"
showing 10 items of 3592 documents
Effect of pulsed electric field on Maillard reaction and hydroxymethylfurfural production
2020
Abstract As an emerging nonthermal processing technology, the application of pulsed electric field (PEF) has received increasing attention not only for its capability to inactivate enzymes and microorganisms or to enhance mass transfer during the extraction process but also for its potential to inhibit the formation of chemical contaminants during processing, such as the formation of hydroxymethylfurfural (HMF). HMF is a potential carcinogen to humans that can be produced via the Maillard reaction (MR). Compared with thermal treatment, PEF can minimize the extent of MR, reducing the contents of HMF. However, in some cases, MR and HMR may be promoted, closely associated with PEF conditions a…
Ionic Liquids on Demand in Continuous Flow
2009
We report on the development of an alternative protocol for the facile, solvent-free synthesis of various novel imidazolium-based ionic liquids (ILs) that affords highly pure products without the necessity of subsequent purification steps. The continuous approach is based on the combination of HPLC pumps with a micromixer and a capillary residence tube. Our system provides a high degree of control over the alkylation reactions due to a high surface-to-volume ratio and superior heat and mass transport. Within the scope of our studies, we focused on ionic liquids containing differently substituted phenyl rings and characterized these compounds with respect to further use for direct applicatio…
New trends in V–P–O solids
1999
On the basis of the industrial interest of the oxovanadium phosphate catalysts, current research effort in this field is focused mainly on the development of synthetic strategies directed towards obtaining open-framework materials. There is a growing body of work describing preparations using hydrothermal procedures under a diversity of conditions. A great number of new solids, whose nets range from lamellar arrays to micro- and mesostructured organizations, has been prepared in last years. In this context, the applicability of concepts and procedures from the zeolites chemistry to systems involving transition elements is critically analyzed.
Chemische charakterisierung des kettenaufbaus und kristallisationsverhaltens von copolymeren aus 3,3-bis(chlormethyl)oxetan und β-propiolacton
1974
Aus 3,3-Bis(chlormethyl)oxetan (1) und β-Propiolacton (2) wurden durch kationische Polymerisation Copolymere hergestellt, in denen Propiolactoneinheiten bis zu einem Molenbruch von 0,16 eingebaut sind. Das Copolymerisationsverhalten wurde untersucht, und die Copolymerisationsparameter wurden bestimmt. Die Copolymeren wurden kristallisiert und die Einkristalle hinsichtlich ihrer Zusammensetzung und Morphologie charakterisiert. Durch selektive Umesterung in den amorphen Bereichen der suspendierten Einkristalle wurde die Verteilung der aus β-Propiolacton gebildeten Einheiten (PL) uber den Kristall untersucht, und die Ergebnisse mit Abbauversuchen an den gelosten Copolymeren wurden verglichen. …
ChemInform Abstract: Low-Loading Asymmetric Organocatalysis
2012
Asymmetric organocatalysis is now recognized as the third pillar of asymmetric synthesis. Recent years have witnessed increasing interest towards the use of highly active and stereoselective organocatalysts. This critical review documents the advances in the development of chiral organocatalysts which are systematically used in ≤3 mol% loading in all the sub-areas of the field, namely aminocatalysis, Bronsted acids and bases, Lewis acids and bases, hydrogen bond-mediated catalysis, phase transfer and N-heterocyclic carbene catalyses (194 references).
Guardia y custodia compartida impuesta
2018
Cuando una pareja con hijos comunes menores de edad deja de convivir surge la necesidad de determinar las reglas o normas por las que se regirá la nueva situación familiar. Estas normas pueden ser de carácter económico o personal. Entre las personales, y una sobre las que más les cuesta decidir a los progenitores, es la relativa al cuidado de los hijos y a cómo se va a dar continuidad a las relaciones con ellos una vez se haya producido la separación. Lo mejor sería que los propios progenitores pudieran llegar a un acuerdo al respecto ya que ellos son los que mejor conocen a sus hijos y los mejores conocedores de la situación que están viniendo. Pero en defecto de acuerdo será necesario det…
Role of Adenosine Receptors in Rare Neurodegenerative Diseases with Motor Symptoms
2021
: The approval of istradefylline, an adenosine 2A receptor (A2AR) antagonist, as an addon treatment in adult patients with Parkinson’s disease by the Food and Drug Administration (FDA) and European Medicines Agency (EMA), is the latest proof of the importance of the adenosinergic system in the nervous system. Adenosine is an endogenous purine nucleoside with a role as a modulator of both neurotransmission and the inflammatory response. As such, the expression pattern of the 4 adenosine receptors (A1R, A2AR, A2BR and A3R) and the extracellular adenosine levels have attracted great interest in the pathogenesis and possible treatment of rare neurodegenerative diseases with motor symptoms. The…
ANKRD26-RET - A novel gene fusion involving RET in papillary thyroid carcinoma
2018
Abstract Background Rearrangements of RET are drivers of oncogenesis, traceable in different cancer types as papillary thyroid carcinoma (PTC), non-small cell lung cancer, colorectal or breast cancer. Anchored multiplex PCR based next-generation sequencing (NGS) can detect RET rearrangements involving previously unknown partner genes. Methods A sample of PTC underwent NGS, following detection of RET rearrangement by fluorescence in situ hybridization. Expression analysis of ANKRD26 and RET was performed for the tumor harboring ANKRD26-RET, for corresponding normal thyroid tissue and PTC tumors with representative genetic alterations (BRAFV600E, CCDC6-RET), complemented by a comparative sear…
Importancia del Trabajo Social como forma de intervención municipal
2011
Trascurridos 30 años de la puesta en marcha del Sistema Público de Servicios Sociales, procede destacar el protagonismo desarrollado por los ayuntamientos que han sido el referente más significativo de la implantación del Sistema por su compromiso institucional en el desarrollo de los Servicios Sociales Generales Básicos, potenciando las Unidades de Trabajo Social en todos los municipios, lo que ha hecho visible para la ciudadanía, tanto las potencialidades de los Servicios Sociales, como sus déficits. Hoy se puede afirmar que las/los ciudadanas/os reclaman de los Servicios Sociales el mismo enfoque que perciben la Sanidad o la Educación, como pilares del Estado de Bienestar y se exige que …
In vivo evaluation of labial microcirculation in diabetics: a comparison with healthy subjects.
2011
AIM: Diabetes mellitus, a systemic chronic disease considered an epidemic by the World Health Organization (WHO) due to the rate of increase in the prevalence of diabetes, is a cause of microvascular and macrovascular complications leading to a significant burden for the individual and society. The aim of this study was to evaluate in vivo the effects of type II diabetes mellitus on the microcirculation of oral mucosa. METHODS: Forty-six subjects, 23 patients with type II diabetes mellitus (10 men, 13 women) and 23 healthy patients (9 men, 14 women) were examined in our laboratory. Oral microcirculation was evaluated on labial mucosa using oral video-capillaroscopy: a diagnostic method that…