Search results for " chimica"
showing 10 items of 3438 documents
X-ray Fluorescence Spectroscopy applied to the study of three sicilian painted artworks
2009
This paper reports on three X-Ray Fluorescence (XRF) studies of ancient Sicilian painted materials: a 13th century canvas from Cerami (Enna, Italy), the Muqarnas wood ceiling of the 12th century Palatine Chapel (Palermo, Italy) and a delicate early 20th century viola d’amore, the property of the Conservatorio di Musica “Vincenzo Bellini” in Palermo. Information about the pigments and preparation layer mixtures used as well as inferences regarding various past painting techniques emerged from the interpretation of spectra and data analyses.
CHEMICAL CHARACTERIZATION AND BIOLOGICAL PROPERTIES OF MACROALGAE EXTRACTS
2023
Marine species are a rich source of bioactive molecules and among them, it is known that marine algae produce different secondary metabolites for which different biological activities such as: immunomodulatory (Raposo et al., 2016), antioxidant (Fisch et al., 2003) and antimicrobial (Pinteus et al., 2015) were demostrated. The aim of this study was chemical charac- terize the extracts of three macroalgae species: Carpodesmia crinite (Duby, Orellana & Sansón, 2019), Carpodesmia brachy- carpa (J. Agardh, Orellana & Sansón 2019, WoRMS, 2023), Ericaria brachycarpa (J. Agardh, Molinari & Guiry, 2020), Asparagopsis taxiformis (Delile) Trevisan 1845) to evaluate also their biological a…
Antifouling Systems Based on a Polyhedral Oligomeric Silsesquioxane-Based Hexyl Imidazolium Salt Adsorbed on Copper Nanoparticles Supported on Titania
2023
The reaction of octakis(3-chloropropyl)octasilsesquioxane with four equivalents of 1-hexylimidazole or 1-decylimidazole gave two products labelled as HQ-POSS (hexyl-imidazolium quaternized POSS) and DQ-POSS (decyl-imidazolium quaternized POSS) as regioisomer mixtures. An investigation of the biological activity of these two compounds revealed the higher antimicrobial performances of HQ-POSS against Gram-positive and Gram-negative microorganisms, proving its broad-spectrum activity. Due to its very viscous nature, HQ-POSS was adsorbed in variable amounts on the surface of biologically active oxides to gain advantages regarding the expendability of such formulations from an applicative perspe…
The use of bioindicators (Posidonia oceanica and benthic foraminifera) to evaluate metal pollution in a complex ecological system: marine coastal env…
2007
Mass spectrometry coupled to chromatography systems and cultural heritage: a case study on the content of an ancient jar
2009
In this chapter an introduction to mass spectrometry will be given, with particular reference to mass spectrometry coupled to chromatography systems. Further some mass spectrometry applications in the field of cultural heritage will be briefly reported and discussed. Finally a experimental investigation on the content of an ancient jar will be reported. Together with experimental details a description of the techniques adopted, results obtained and forthcoming experiments will be also given.
Studi di dinamica molecolare su Mdm2 legata a due differenti inibitori
2009
MOLECULAR DYNAMICS AND DOCKING IN THE STUDY OF NEW INHIBITORS OF MDM2-p53 INTERACTION
2008
Effects of the Extraction Technology on Pomegranate Juice Quality
2020
Pomegranate juice is a rich source of phenolic components; its consumption has considerably increased throughout the world in recent years, due to its nutraceutical properties. Commercial juice production involves pressing the fruits. The aim of this study was to assess the influence of the pressing stage on pomegranate juice properties, in terms of value, duration of the applied pressure and juice yield in order to examine the influence of pressure level on volatiles and nutraceutical properties of the juice. Pomegranate fruits cv. Wonderful One were manually harvested and mechanically processed for extracting the juice by means of a shelling machine, a peristaltic pump and a pneumatic pre…
Micro-X-Ray Fluorescence and the Old Masters Non-destructive in situ characterisation of the varnish of historical Low Countries stringed musical ins…
2012
Applied Physics A, 107
Paracentrin 1, a synthetic antimicrobial peptide from the sea-urchin Paracentrotus lividus, interferes with staphylococcal and Pseudomonas aeruginosa…
2014
The rise of antibiotic-resistance as well as the reduction of investments by pharmaceutical companies in the development of new antibiotics have stimulated the investigation for alternative strategies to conventional antibiotics. Many antimicrobial peptides show a high specificity for prokaryotes and a low toxicity for eukaryotic cells and, due to their mode of action the development of resistance is considered unlikely. We recently characterized an antimicrobial peptide that was called Paracentrin 1 from the 5-kDa peptide fraction from the coelomocyte cytosol of the Paracentrotus lividus. In this study, the chemically synthesized Paracentrin 1, was tested for its antimicrobial and antibiof…