Search results for "Cero"
showing 10 items of 691 documents
Extraction, Characterization and Incorporation of Hypericum scruglii Extract in Ad Hoc Formulated Phospholipid Vesicles Designed for the Treatment of…
2020
An extract of Hypericum scruglii, an endangered endemic plant of Sardinia (Italy), was prepared and characterized. It was loaded in special phospholipid vesicles, glycerosomes, which were modified by adding maltodextrin (glucidex) and a polymer (gelatin or hyaluronan). The corresponding liposomes were also prepared and used as reference. The vesicles disclosed suitable physicochemical features for skin delivery. Indeed, their mean diameter ranged from 120 to 160 nm, they were homogeneously dispersed (polydispersity index &le
Sul ‘finis in iure civili’ di Cic., de orat. I.188
2009
Imidazolium-2-carboxylate as an afficient, expeditious and eco-friendly organocatalyst for glycerol carbonate synthesis
2009
An improved and greener approach towards the synthesis of glycerol carbonate, via transesterification, using 1-n-butyl-3-methylimidazolium-2-carboxylate as catalyst is described. The catalyst loading as low as 1% was sufficient to yield quantitative conversions. A plausible mechanism is proposed for the catalytic cycle leading to product formation.
Rapid Assessment of Gray Mold (Botrytis cinerea) Infection in Grapes with a Biosensor System
2015
Abstract: Botrytis cinerea is the causative agent of gray mold disease, which causes considerable economic losses to winemakers. The extent of gray mold infection of winegrapes is commonly visually estimated, a method that is prone to assessor bias. Here, we used rapid and simple enzyme-based screening consisting of carbon-electrode, screen-printed amperometric biosensors to estimate gluconic acid and glycerol concentration in winegrapes infected with different degrees of B. cinerea. The lower limits of quantification of the screen-printed amperometric biosensors were 3 mg/L for gluconic acid (corresponding to an infection rate of less than 1%) and 35 mg/L for glycerol; the response times w…
Mechanistic Origins of the pH Dependency in Au-Catalyzed Glycerol Electro-oxidation: Insight from First-Principles Calculations
2021
Electrocatalytic oxidation of glycerol (EOG) is an attractive approach to convert surplus glycerol to value-added products. Experiments have shown that EOG activity and selectivity depend not only on the electrocatalyst but also on the electrode potential, the pH, and the electrolyte. For broadly employed gold (Au) electrocatalysts, experiments have demonstrated high EOG activity under alkaline conditions with glyceric acid as a primary product, whereas under acidic and neutral conditions Au is almost inactive producing only small amounts of dihydroxyacetone. In the present computational work, we have performed an extensive mechanistic study to understand the pH and potential dependency of …
HLA-DQ de enfermedad celíaca en pacientes con enfermedad inflamatoria intestinal crónica
2015
Introducción: La enfermedad celíaca (EC) y la Enfermedad Inflamatoria Intestinal Crónica (EIIC, que incluye CU –colitis ulcerosa- y ECr –Enfermedad de Crohn-) son enfermedades cuya incidencia y prevalencia va en aumento, y en las que se consideraba que tener una de ellas aumentaba la predisposición a la otra. El HLA-DQ 2 y DQ8, de riesgo de EC (HLA-EC), tiene un alto valor predictivo negativo, estando presente en el 95-99% de los celíacos. Nuestra hipótesis era que el HLA-EC no es más frecuente en la EIIC. Material y método: Se incluyeron prospectivamente pacientes adultos con EIIC, de origen caucásico, de nuestra Unidad de EIIC. Se les realizaba entrevista, estudio de su historia clínica y…
De la tierra al telar. El hilado en Edetania y Contestania entre los siglos V a.C. – III d.C. Aspectos técnicos, económicos y sociales.
2018
Con el título “De la Tierra al Telar. El hilado en Edetania y Contestania entre los siglos V a.C.-III d.C. Aspectos técnicos, económicos y sociales” pretendemos realizar un estudio sobre el proceso del hilado en su totalidad dentro de este marco cronológico y geográfico. Esto implica abarcar fases del proceso que, a priori, no parecen relacionadas con el proceso de hilatura, como el sembrado y recolección en el caso de las fibras vegetales, así como la cría y extracción para la fibras animales; analizando cada una de las fases de su procesado hasta el momento en que éstas se encuentran listas para la elaboración del hilo que posteriormente será parte de un tejido, centrando el estudio parti…
ReO as a Brønsted acidic modifier in glycerol hydrodeoxygenation : Computational insight into the balance between acid and metal catalysis
2023
A computational study for the competitive conversion of glycerol to 1,2-propanediol and 1,3-propanediol is presented, considering a two-step sequence of dehydration followed by hydrogenation. The elementary steps for dehydration, i.e., breaking of C–H followed by C–OH or vice versa, were studied computationally both on the Rh metal surface and the acid-modified ReOH–Rh surface in order to understand the role of the acid promoter. While the acid modifier can catalyze the C–OH cleavage, the activation energy for the C–H cleavage was found to be considerably smaller on both pure and acid-doped Rh(111) surfaces, and breaking the secondary C–H bond is kinetically favored over breaking the termin…
Oficerowie wyznania ewangelickiego ze Śląska w armii szwedzkiej podczas wielkiej wojny północnej (1700 –1721). Prolegomena
2019
The article constitutes a prolegomenon to the issue of the service of Silesian Evangelicals in the Swedish army during the Great Northern War (1700 –1721), which has so far been absent in scholarly literature. The main objective of this text is to analyse their motives for joining the military service of the Kingdom of Sweden, as well as to trace their career and position in the officer corps. The above issue is part of the research on the officer corps of Charles XII’s army, and thus it may serve as an important point of reference also for the works devoted to the service of Polish and Lithuanian officers in the Swedish army of that period. A group of several dozen representatives of the S…
Ionic Liquids as Homogeneous Catalysts for Glycerol Oligomerization
2022
Ionic liquids (ILs) were used for the first time as catalysts for the glycerin condensation reaction. A series of imidazolium and ammonium ionic liquids differing in the length of the alkyl substituent (C2, C12, and C14) and the type of anion (Br−, CH3COO−, and NaHPO4−) were synthesized using a typical two-step method. The structure of the obtained ILs was confirmed by nuclear magnetic resonance 13C NMR, and their base power was determined on the basis of the Hammett function. The oligomerization of glycerin with the participation of the obtained ionic liquids and, for comparison, in the presence of a homogeneous basic catalyst Na2CO3, was carried out for 3 h at 180 °C, under a pressure of …