Search results for "Esteri"
showing 10 items of 220 documents
Indagine preliminare sulla produzione e composizione di succo fermentato di Fico d'India (Opuntia ficus-indica)
2011
Torque rheometry investigation of model transreactions involving condensation polymers: I. Polyesters
2005
The chemical transformations taking place when poly(ethylene terephthalate) (PET) or poly(ethylene naphthalate) (PEN) are blended in the melt with different low molar mass substances containing hydroxyl, carboxyl, or amine functional groups have been investigated as models of the transreactions, undergone by the polyesters in reactive blending operations. The polyester molecular weight changes caused by the alcoholysis, acidolysis, aminolysis, and esterolysis reactions have been monitored by torque-rheometry, using a Brabender Plasticorder static mixer. The degradation of the polyesters by hydrolysis was also studied, under similar conditions, by the addition of a water-releasing substance …
L’agroforesterie, le futur de la viticulture ?
2020
L’agroforesterie est l’association sur une même parcelle d’une végétation arborée et/ou arbustive, et d’une production végétale, animale ou mixte. Les espèces ligneuses peuvent être réparties uniformément, inégalement ou en bordure de parcelle. Les systèmes agroforestiers fournissent des services écosystémiques et des produits et ce à différentes échelles ; parcelle, exploitation agricole, unité paysagère » (RRAF, 2018). La productivité de ces systèmes dépend de la différence nette entre les avantages et les coûts, entre les utilisations et les composantes biophysiques de l’agroenvironnement. Dans les systèmes de cultures intercalaires, les avantages des arbres sont à la fois économiques et…
Cutinases: Characteristics and Insights in Industrial Production
2021
Cutinases (EC 3.1.1.74) are serin esterases that belong to the α/β hydrolases superfamily and present in the Ser-His-Asp catalytic triad. They show characteristics between esterases and lipases. These enzymes hydrolyze esters and triacylglycerols and catalyze esterification and transesterification reactions. Cutinases are synthesize by plant pathogenic fungi, but some bacteria and plants have been found to produce cutinases as well. In nature they facilitate a pathogen’s invasion by hydrolyzing the cuticle that protects plants, but can be also used for saprophytic fungi as a way to nourish themselves. Cutinases can hydrolyze a wide range of substrates like esters, polyesters, triacylglycero…
Pre-Clinical Studies with D-Penicillamine as a Novel Pharmacological Strategy to Treat Alcoholism: Updated Evidences
2017
Ethanol, as other drugs of abuse, is able to activate the ventral tegmental area dopamine (VTA-DA) neurons leading to positively motivational alcohol-seeking behavior and use, and, ultimately to ethanol addiction. In the last decades, the involvement of brain-derived acetaldehyde (ACD) in the ethanol actions in the mesolimbic pathway has been widely demonstrated. Consistent published results have provided a mechanistic support to the use of ACD inactivating agents to block the motivational and reinforcing properties of ethanol. Hence, in the last years, several pre-clinical studies have been performed in order to analyze the effects of the sequestering ACD agents in the prevention of ethano…
Elektroķīmiska α,β-nepiesātinātu esteru iegūšana no 2-(hidroksimetil)furāna atvasinājumiem
2020
Darbā veikta 2-(hidroksimetil)furāna un tā analogu elektroķīmiska oksidēšana konstantas strāvas apstākļos, lai iegūtu spirociklus un α,β-nepiesātinātus esterus.
Economia di Mercato, Investimenti Diretti dall'Estero e Corruzione nei Paesi in Via di Sviluppo: Ipotesi Teoriche e Prime Verifiche Empiriche
2006
Il saggio analizza i legami che possono intercorrere fra le restrizioni alle attività economiche e la corruzione nelle economie di mercato emergenti, e il loro impatto sui flussi degli Investimenti Diretti Esteri (IDE) all''interno di questi paesi da parte di imprese multinazionali. Si ipotizza che il livello di corruzione esistente in un dato paese sia in larga parte coctituito da una forma di rent-seeking interpretata come una risposta razionale da aprte degli agenti economici al contesto istituzionale in cui essi operano. Lo studio contiene una parte empirica volta a verificare se il livello di corruzione prodotto dall''attività di regolamentazione pubblica influenza i flussi di IDE nell…
Clean and Sustainable Biodiesel Production
2015
To date, the majority of world's primary energy is derived from fossil fuels. However, the fossil fuel recourses are in an inevitable decline as energy demand continues to grow exponentially with population growth, urbanization, and improved standards of living. Crude oil prices have recently risen several times and their current annual volatility exceeds 30%. The potential scarcity of fossil fuels has prompted a global search for alternative energy resources. Biodiesel fulfills the major requirements for production of alternative fuels such as feedstock availability, technical feasibility, and economic competitiveness. Together with other renewable biofuels, the use of biodiesel as a subst…
Understanding the Solution Behavior of Epinephrine in the Presence of Toxic Cations: A Thermodynamic Investigation in Different Experimental Conditio…
2020
The interactions of epinephrine ((R)-(&minus
Synthèse et réactivité chimiques et électrochimiques de dérivés d'imidazoliums : vers des procédés éco-responsables
2015
This work deals with the use of electrochemistry as a tool for alternative synthesis of new azolium-based molecules.A new electrosynthesis method was developed for the synthesis of imidazolium carboxylates (masked carbenes) leading to a wide library of compounds. This approach was compared to already reported chemical syntheses. In the current context of sustainable development, bio based products have been synthesized and optimization of the process was achieved in order to reduce waste and energy consumption.The key role of the hydrogenoxalate anion was demonstrated in the synthesis of ionic liquids and/or imidazolium salts. Some of them were employed as recyclable catalysts for Fischer e…