Search results for " radical"

Allocation of Ambipolar Charges on an Organic Diradical with a Vinylene-Phenylenediyne Bridge.

2021

Two redox and magnetically active perchlorotriphenylmethyl (• PTM) radical units have been connected as end-capping groups to a bis(phenylene)diyne chain through vinylene linkers. Negative and positive charged species have been generated, and the influence of the bridge on their stabilization is discussed. Partial reduction of the electron-withdrawing • PTM radicals results in a class-II mixed-valence system with the negative charge located on the terminal PTM units, proving the efficiency of the conjugated chain for the electron transport between the two terminal sites. Counterintuitively, the oxidation process does not occur along the electron-rich bridge but on the vinylene units. The • …

Creencia, significado y escepticismo

2004

Las consideraciones antiescépticas desarrolladas por Davidson, como las de Putnam, tienen un carácter trascendental: parten de hechos que el escéptico ha de aceptar y tratan de mostrar que tales hechos no lo serían si las hipótesis escépticas fuesen verdaderas. Es dudoso que dichas consideraciones consigan realmente su objetivo. Sin embargo, no creo que Davidson estuviera realmente interesado en una refutación detallada del escepticismo. Su interés se centra más bien en el contexto del que surge: la imagen cartesiana de las relaciones entre subjetividad, intersubjetividad y objetividad. Y el verdadero valor de las reflexiones antiescépticas de Davidson reside en la imagen alternativa que la…

Les exercices gradués dans la méthode du Grammalessico francese a uso degl’italiani d’Arminio Wurmbrand Bianchi

2020

L’article se propose d’analyser les exercices du manuel d’Arminio Wurmbrand Bianchi, Grammalessico francese a uso degl’italiani, qui ont une forme et une structure que l’on retrouve dans de nombreux manuels s’inspirant des méthodes dites « synthétiques ». Wurmbrand, en effet, introduit dans son manuel une nouveauté pour pourvoir au caractère incomplet de la méthode synthétique : il propose, ainsi, avant chaque exercice, la traduction des seuls termes « radicalement dissemblables » des deux langues « similaires à l’origine » qui caractérisent la langue française et la langue italienne. Le but est de fournir aux élèves la maîtrise lexicale de la langue française avec une attention toute parti…

Radikalizācijas ekonomiskās sekas

2019

Finanšu un ekonomiskā krīze, pēdējā laikā notikusī nekontrolētā migrācija un teroristu uzbrūkumi izraisa politisko radikalizāciju dažās valstīs. Šajā pētījumā tiek aplūkoti augošā populisma un radikalizācijas ekonomiskie iemesli un sekas, kā arī ārējie un iekšējie ierobežojumi, vērsti uz negatīvo ekonomisko seku mazināšanu. Lai ilustrētu un pamatotu konstatējumus, tiks analizēti trīs gadījumi: nesenās politiskās radikalizācijas iemesli un sekas Grieķijā, Itālijā un ASV. Īpaša uzmanība tiek pievērsta ekspansīvajai fiskālajai politikai un protekcionisma politikai. Mēs pieņemam, ka populismam un radikalizācijai ir negatīva ietekme uz tautsaimniecību, vienlaikus valdības īsteno ekspansīvo fiskā…

Chemical Composition and Free Radical Scavenging Activity of the Essential Oil of Achillea ligustica Growing Wild in Lipari (Aeolian Islands, Sicily)

2013

In the present study the chemical composition of the essential oils from aerial parts and flowers of Achillea ligustica All., collected in Lipari (Aeolian Islands) was evaluated by GC and GC-MS. ( Z)-Chrysanthenyl acetate was the most abundant component of both oils (29.6% in A1 and 27.8% in F1), followed by viridiflorol (16.8% in A1 and 21.6% in F1), bornyl acetate (8.7% in A1 and 11.6% in F1) and 1,8-cineole (7.4% in A1 and 9.3% in F1). A comparison was made of the composition of the different populations studied so far. Futhermore, the free radical scavenging activity of the oil was determined by DPPH and ABTS methods.

Impact of electron beam irradiation on fish gelatin film properties

2016

International audience; The objective of this work was to display the effect of electron beam accelerator doses on properties of plasticized fish gelatin film. Electron spin resonance indicates free radical formation during irradiation, which might induce intermolecular cross-linking. Tensile strength for gelatin film significantly increases after irradiation (improved by 30% for 60 kGy). The vapour permeability is weakly affected by irradiation. Surface tension and its polar component increase significantly and are in accordance with the increase of wettability. So, irradiation may change the orientation of polar groups of gelatin at the film surface and crosslink the hydrophobic amino aci…

Antyoksydanty - przepis na długowieczność?

2016

Chemical Characteristics and Viability of Starter Cultures of Freeze–Dried Sweet Potato Extract–Supplemented Synbiotic Yogurt

2021

The research aimed to determine the sucrose concentration as a cryoprotectant to obtain the chemical properties and the viability of Lactic Acid Bacteria (LAB) and Lactobasillus plantarum in the synbiotic yogurt. It adopted a one–factor Completely Randomized Design (CRD) by including sucrose in concentrations from 0 %, 2.5 %, 5 % to 7.5 %, three replications. The results showed various sucrose concentrations significantly affected the yields of the purple sweet potato extract– supplemented synbiotic yogurt, reduction–sugar level, the total of LAB, and the total of L. plantarum before and after the freeze–drying process, no significant impact on the moisture content and total quantity of LAB…

Functionalized poly(butylene succinate) by nitroxide radical coupling

2014

In recent years there has been a growing interest in developing sustainable alternatives to oil-based plastics. In particular, biodegradable aliphatic polyesters, such as poly(lactic acid) (PLA) and poly(butylene succinate) (PBS), are becoming increasingly important due to their valuable properties including thermoplastic processability and thermo-mechanical properties. Nonetheless, these materials present several drawbacks, such as the lack of reactive functionalities that are limiting their applications, versatility and successful use as commodity plastics. In this work it was investigated for the first time a new method of preparation of functionalized PBS by a post-polymerization approa…

Polyphenol Characterization and Antioxidant Activity of Grape Seeds and Skins from Sicily: A Preliminary Study

2022

The interest in the consumption of health-promoting foods has led to identifying derivatives of the wine industry as products to increase the functional properties of different foods or to design new functional foods. The main goal of this study is to characterize and valorize byproducts and wastes of Sicilian grapes as new sources of bioactive components, from the perspective of a circular economy and a biorefinery approach. In particular, this research investigated: 1. the total phenolic content and antioxidant activities and 2. the phenolic profiles of free and bound fractions of defatted grape seeds and red grape skins from Sicily. Defatted grape seeds (DGS) and red grape skins (RGSK) a…