Search results for "Roca"
showing 10 items of 1893 documents
Identification of Polycyclic Aromatic Hydrocarbons (PAHs) in the black crusts of Sicilian stone monuments: distribution and sources
2004
Polycyclic Aromatic Hydrocarbons are a family of compounds with known carcinogenic potential; their properties of lipophilicity, low water solubility and adsorption to particles and sediments make them a potentially dangerous group of chemicals and a threat to the environment and its bio-resources. The concentrations of total Polycyclic Aromatic Hydrocarbons (PAHs) and 19 individual compounds in 8 black crusts sampled from historical building of Palermo (Italy) were analyzed, by gas chromatography/mass spectrometry (GC/MS) in selected ion monitoring (SIM) mode. PAH concentrations ranged from 78 to 9798 g/Kg of dry matrix. The resulting distributions and molecular ratios of specific compo…
Potential of the polychaete Sabella spallanzanii as bioindicator for PHAs
2009
Every year 230.000 t of polycyclic aromatic hydrocarbons (PHAs) enter the marine environment, resulting ubiquitously distributed world‐wide. These compounds are aromatic molecules of special concern because of their toxic and carcinogenic properties. The two main sources of PHAs in the environment are fossil fuels, mainly crude oil, and the incomplete combustion of organic materials such as wood, coal and oil. They enter the sea by both atmospheric and aquatic routes. As a consequence of their hydrophobic nature, in aquatic environments PHAs rapidly tend to associate with particulate matter and sediments represent the most important reservoir. Animal and aquatic plants can accumulate PHAs f…
LO STATO ITALIANO E LA CHIESA CATTOLICA, OGGI: IL CONSOLIDAMENTO DEL PRINCIPIO DELLA RECIPROCA COLLABORAZIONE (ART. 1 ACCORDO DI REVISIONE CONCORDATA…
2017
The climate of peculiar "harmony" which marked the official visit of the Holy Father to the President of the Italian Republic Sergio Mattarella, on 10 June 2017, did not go unnoticed to the political press:in order to have notice of it, after all, it would have been enough (even only) to glance through the transcripts of the speeches given by the two Authorities, where it is easily traceable a singular convergence of “tone”, register and -in some passages,even of -contents. Thus, with respect to the latter, for instance, various press organs have grasped the “consonant” JusOnline n. 1/2018ISSN 1827-794289highlighting of a "factual" (fundamental) data, such as the fruitfulness of the mutual …
Ink depletion-free printing of phospholipids micropatches
2021
Effect of an insect growth regulator (halofenozide) on the cuticular hydrocarbons of Culex pipiens larvae
2013
The cuticular hydrocarbons of the fourth-instar larvae of Culex pipiens aged one and six days were analysed by gas chromatography and gas chromatography-mass spectrometry. The effect of an insect growth regulator (halofenozide = RH-0345) on the cuticular hydrocarbons was evaluated using newly moulted fourth-instar larvae of C. pipiens, at the lethal concentrations (LC50 = 12.58 and LC90 = 28.58 mu g/l). A previous study revealed that RH-0345 is toxic to larvae of C. pipiens by induction of precocious larval moulting. Several cuticular hydrocarbons (CHCs) were identified and many of the other compounds remained unknown. Our data show that the CHC classes consisted of n-alkanes (C23-C29) and …
Synthesis and characterization of a new set of protic ionic liquids
2012
Znaczenie przysięgi małżeńskiej w strukturze sakramentu
2017
Zagadnienie przysięgi małżeńskiej jest przedmiotem refleksji specjalistów z zakresu prawa kanonicznego, liturgistów i teologów. W teologii refleksja o przysiędze małżeńskiej często jest redukowana do wyjaśnienia jej treści i kwestii szafarza sakramentu małżeństwa. W dokumentach Kościoła katolickiego o małżeństwie i opracowaniach teologów jednomyślne jest stanowisko o przysiędze małżeńskiej jako konstytutywnym elemencie sakramentu. Wyjaśnienie istoty tego związku jest współcześnie jednym z ważniejszych problemów teologii małżeństwa. Zarówno natura przysięgi małżeńskiej, jak też jej treści i okoliczności wypowiedzenia mają znaczenie dla sakramentu małżeństwa i są związane z jego istotą. Ninie…
Proton reduction by phosphinidene-capped triiron clusters
2021
Bis(phosphinidene)-capped triiron carbonyl clusters, including electron rich derivatives formed by substitution with chelating diphosphines, have been prepared and examined as proton reduction catalysts. Treatment of the known cluster [Fe3(CO)9(µ3-PPh)2] (1) with various diphosphines in refluxing THF (for 5, refluxing toluene) afforded the new clusters [Fe3(CO)7(µ3-PPh)2(κ2-dppb)] (2), [Fe3(CO)7(µ3-PPh)2(κ2-dppv)] (3), [Fe3(CO)7(µ3-PPh)2(κ2-dppe)] (4) and [Fe3(CO)7(µ3-PPh)2(µ-κ2-dppf)] (5) in moderate yields, together with small amounts of the corresponding [Fe3(CO)8(µ3-PPh)2(κ1-Ph2PxPPh2)] cluster (x = -C4H6-, -C2H2-, -C2H4-, -C3H6-, -C5H4FeC5H4-). The molecular structures of complexes 3 a…
Metacognizione e comprensione della lettura: quale rapporto?
2019
Una lettura competente implica l’utilizzo di specifiche strategie meta-cognitive e molteplici livelli di elaborazione delle informazioni che, se impiegate in modo consapevole, migliorano la comprensione. In que-sto lavoro si presenta un approfondimento sulla relazione tra metaco-gnizione, thinking aloud e comprensione della lettura, che si colloca all’interno alla ricerca nazionale RC-RT descritta in questo stesso vo-lume e volta a verificare l’efficacia del Reciprocal Teaching nel contesto italiano. Dopo aver presentato alcune ricerche svolte su allievi di età diverse finalizzati ad evidenziare il rapporto tra la comprensione della lettura e le abilità di secondo livello, raggruppate sotto…
TRATTAMENTO DI SEDIMENTI MARINI MEDIANTE REATTORI BIOSLURRY: ANALISI DI PROCESSO E CARATTERIZZAZIONE MICROBIOLOGICA
2020
I sedimenti, elementi essenziali e dinamici di tutti i sistemi acquatici, rappresentano un potenziale serbatoio di sostanze tossiche di origine antropogenica. In ambiente marino, essi costituiscono un comparto ambientale estremamente complesso, con modalità di formazione, caratteristiche chimico-fisiche, organismi viventi e tipi di contaminazione estremamente variabili. In particolare, gli idrocarburi di origine petrolifera (indicati globalmente con la misura dei TPH - Total Petroleum Hydrocarbon) inquinanti prioritari particolarmente diffusi nelle aree fortemente industrializzate, tendono a rimanere intrappolati nei sedimenti per lunghi periodi di tempo; ciò li rende una fonte permanente d…