Search results for "composition"

Contribution to a Taxonomic Revision of the Sicilian Helichrysum Taxa by PCA Analysis of Their Essential-Oil Compositions

2016

The chemical profile of the essential oils in ten populations of the genus Helichrysum Mill. (Asteraceae), collected in the loci classici of the nomenclatural types of the taxa endemic to Sicily, were analyzed. Our results confirm that the analysis of secondary metabolites can be used to fingerprint wild populations of Helichrysum, the chemical profiles being coherent with the systematic arrangement of the investigated populations in three main clusters, referring to the aggregates of H. stoechas, H. rupestre, and H. italicum, all belonging to the section Stoechadina. The correct nomenclatural designation of the investigated populations is discussed and the following two new combinations ar…

Chemical Composition of the Essential Oil of Mentha pulegium Growing Wild in Sicily and its Activity on Microorganisms Affecting Historical Art Crafts

2017

The chemical composition of the essential oil from aerial parts of Mentha pulegium L. (Linné) collected in Sicily was evaluated by GC and GC-MS. The main components were pulegone (50.6%), piperitenone (27.8%) and menthone (6.9%). Comparison of this oil with other studied oils of different populations is discussed. The oil showed good antibacterial and antifungal activities against some microorganisms that infest historical art works.

Mycochemical investigation of Pleurotus eryngii var. eryngii

2017

The mycochemical composition and structural characterization of the whole aqueous and methanolic extracts from Pleurotus eryngii var. eryngii are investigated. Two water-soluble glucans were obtained from the fruiting bodies by hot water extraction, ethanol precipitation, dialysis and Sephadex G-200 gel filtration. On the basis of total hydrolysis, methylation analysis, and NMR studies (1H, 13C, DQF-COSY, TOCSY, HSQC and HMBC) two fractions PEPS-1 and PEPS-2 were characterized and the structure of the repeating unit of the glucan were determined as linear (1→6)--glucan and (1→6)--glucan, respectively. The methanolic extract of Pleurotus eryngii var. eryngii was also investigated and a com…

Is it possible to compose and educate interculturally? Experiences from the Spanish educational system

2019

Resumen La educación de la sociedad española actual pasa por una necesaria revisión de la metodología didáctica para que el sistema educativo pueda responder a las necesidades del alumnado del siglo XXI. La pluriculturalidad de éste ha llevado a que el profesorado realice un replanteamiento de sus actos educativos, puesto que pertenece a una generación que no ha vivido en primera persona con las causas y efectos de una situación pluricultural, más allá del hecho obvio de que nuestro territorio nacional se formó sobre las bases de las migraciones de distintos pueblos llegados de distintas partes del mundo. Es decir, que precisan una formación en las distintas opciones educativas comprendidas…

The Educational Construction of a Social Person and the Unexpected Development of a Human Being

2008

The phenomenon of migratory flows, always present in human history, is today analyzed in such a way as to define a boundary, an us and a them. From the point of view of the host society, the problem is seen in terms of the legitimate conditions of “entry”. But in actual fact, migratory flow modifies the social composition of the political community and therefore could lead to the obligation of also observing phenomena from the migrant’s point of view.

Polarizability and optical rotation calculated from the approximate coupled cluster singles and doubles CC2 linear response theory using cholesky dec…

2004

A new implementation of the approximate coupled cluster singles and doubles CC2 linear response model using Cholesky decomposition of the two-electron integrals is presented. Significantly reducing storage demands and computational effort without sacrificing accuracy compared to the conventional model, the algorithm is well suited for large-scale applications. Extensive basis set convergence studies are presented for the static and frequency-dependent electric dipole polarizability of benzene and C60, and for the optical rotation of CNOFH2 and (−)-trans-cyclooctene (TCO). The origin-dependence of the optical rotation is calculated and shown to persist for CC2 even at basis set convergence. …

Assessment of the quality of the air in the city of Palermo through chemical and cell analyses on Pinus Needles

2001

The influence of air pollution on the chemical composition of Pinus sp. needles was examined in polluted and control sites in and around the city of Palermo (Sicily). The chemical composition of needles indicated the extent of contamination of the trees, which were cytologically examined. Cell analysis was carried out on pine samples, including needles and pollens, from 15 different locations. Biostructural and spectrophotometric tests were performed. In particular, concentrations of toxic (Cd, Pb) and non-toxic metals (Fe,Cu, Zn) were determined, as well as injury caused by their accumulation in the needles. The more highly urbanised areas showed higher concentrations of metals (Pb, Cu. Zn…

How villages contribute to their local air quality – The influence of traffic- and biomass combustion-related emissions assessed by mobile mappings o…

2021

Abstract Mobile mapping experiments were performed in two villages (~400 and ~2500 inhabitants, respectively) in France and Germany in both summer and winter in order to assess the pollutant distribution of several particulate matter (PM) related pollutants (particle number concentration, PM1, PM2.5, PM10; PM1 chemical composition, including inorganic and organic species, black carbon, and polyaromatic hydrocarbons) as well as CO2. Two dominating local emission contributions were found: traffic contributed to organic aerosol (OA), CO2, particle number concentration, PM1, black carbon, and polyaromatic hydrocarbons, whereas significant primary emission contributions from biomass combustion w…

Embryotoxic potential of persistent organic pollutants extracted from tissues of guillemots (Uria aalge) from the Baltic Sea and the Atlantic Ocean

2002

The Baltic Sea is a heavily polluted area. To assess the current contaminant pressure on the common guillemot (Uria aalge) living there, whole-body extracts of guillemots from the Baltic Sea were prepared and subdivided over six fractions, which differed in composition due to lipophilicity and polarity of the contaminants. The fractions were tested in the chicken embryo assay and compared to fractions of Atlantic guillemot extracts. Fertilized chicken eggs were injected with 0.03, 0.3, or 3 bird egg equivalents (BEQ) of the contaminants present in the fractions and then incubated for 19 d. Endpoints were selected to cover several mechanisms that may play a role in reproductive failures of f…

2018

Abstract. As part of the Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) project, an airborne campaign was designed to measure a large range of atmospheric constituents, focusing on the effect of anthropogenic emissions on regional climate. The presented study details results of the French ATR42 research aircraft, which aimed to characterize gas-phase, aerosol and cloud properties in the region during the field campaign carried out in June/July 2016 in combination with the German Falcon 20 and the British Twin Otter aircraft. The aircraft flight paths covered large areas of Benin, Togo, Ghana and Côte d'Ivoire, focusing on emissions from large urban conurbations such …