Search results for "Tecnologie"
showing 10 items of 1379 documents
Gamma irradiation of xyloglucans and hydroxypropyl cellulose in dry and humid solid state to tune molecular weight distribution
2022
Protecting from Oxygen (and from other gases)
2016
As mentioned in previous chapters, the benefits provided by innovation in the paper and board business are connected with the possible chemical modification of fibres, with coupling with other materials (composites), as well as with special surface treatments. Today paper and board can substitute polymers by virtue of their enhanced ability to act as barriers to gases, while displaying an active, antimicrobial, photocatalytic, etc. behaviour. The desired barrier effect is primarily against oxygen. Considerable interest was aroused in the past by substances like artificial or natural antioxidant additives, capable to act as a barrier to oxygen by preventing its action, as well as by solution…
Oligonucleotides-decorated-poly(N-vinyl pyrrolidone) nanogels for gene delivery
2013
Pulsed electron-beam irradiation of a semi-dilute poly(N-vinyl pyrrolidone) (PVP) aqueous solution in the presence of acrylic acid has led to a carboxyl functionalized nanogel system. Nanoparticles hydrodynamic size and surface charge density, in water and as a function of pH, were investigated by dynamic light scattering and laser doppler velocimetry, respectively. Nanogels (NGs) were proved not to be cytotoxic at the cellular level. Indeed, they rapidly bypass the cellular membrane to accumulate in specific cell portions of the cytoplasm, in the perinuclear area. The availability of pendant carboxyl groups on the crosslinked PVP NGs core prompted us to attempt their decoration with a sing…
Studio sperimentale di giunti ibridi CFRP-alluminio
2011
Didattica pluringue dell’italiano e tecnologie Web
2010
Le tecnologie Web consentono di sviluppare le condizioni per un apprendimento socialmente e cognitivamente significativo di repertori linguistici multilimgui.
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…
Emerging photocatalytic applications of graphitic carbon nitride
2016
Graphitic carbon nitride assisted partial photocatalytic oxidation of the biomass platform molecule 5-hydroxymethyl-2-furfural (HMF) in aqueous medium was investigated. Different carbon nitride precursors were considered, being melamine the one yielding the most efficient photocatalyst The thermal exfoliation procedure of g-C3N4 gave rise to exfoliated samples with higher specific surface areas that also showed both an enhanced photocatalytic activity in conversion of HMF, and selectivity (ca. 42-45 %) towards FDC. The utilization of radical scavengers revealed that superoxide radicals were the main reactive species responsible for HMF oxidation to FDC. The use of natural solar light result…
Selective (photo)catalytic formation of 2-propanol from propene by using an heteropolyacid supported on different oxides
2012
Heterogeneous Photocatalysis for Selective Formation of High-Value-Added Molecules: Some Chemical and Engineering Aspects
2018
This review deals with the parameters that influence heterogeneous photocatalysis (PC) for selective synthesis of high-value chemicals by itself or in combination with other technologies. In particular, the parameters related to the photocatalysts, such as crystallinity degree, type of polymorph, surface acid-base properties, exposure of particular crystalline facets, coupling of different semiconductors, position of the valence and conduction band edge, addition of doping agents, and those related to the reaction system, such as setup configuration and reactor geometry, type of solvent, type and amount of photocatalyst, affecting the selectivity toward specific products are described and d…
El desorden digital. Guía para historiadores y humanistas
2013
No es sólo la historia o las humanidades, es el mundo el que está cambiando, en ocasiones de forma estimulante; en otras, de una manera que nos sobresalta. Muy pocos son los que pueden presumir de comprender esa mutación. En medio de la transformación digital, zarandeados por el remolino del cambio, la sensación de confusión y desconcierto es inevitable. Este volumen se ofrece como ayuda, como guía para comprender algunos de los fenómenos que acompañan «el desorden digital» en el que estamos inmersos: los cambios en los soportes, en la lectura, en la escritura, en el documento y el archivo mismos, en la condición y la función de autor, en los modos de colaboración y en la difusión del conoc…