653 research outputs found
Culture, creativity and citizenship in Scotland Case studies and discussion
No full textAuthor: Cristina Losito. Title from coverAvailable from British Library Document Supply Centre- DSC:m03/11237 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
Rapid and automatable determination of ochratoxin A in wine based on microextraction by packed sorbent followed by HPLC-FLD
No full textThe development of miniaturized and automatized analytical methods for OTA determination, requiring a reduced use of solvents and a limited involvement of expert operators, is highly desirable. Therefore, a rapid and automatable method for the determination of OTA in wine using a microextraction by packed C18 sorbent followed by high performance liquid chromatography with fluorescence detection was developed and validated for a successful application in the context of wine production. Important experimental parameters, such as sample and eluent volumes, extraction mode, draw and dispense speeds, number of eluent passes up and down through the stationary phase, were optimized. The validation included the comparison of the sensitivities related to solvent-matched, matrix-matched and standard addition calibrations and the participation to a proficiency test in a inter-laboratory circuit. Matrix effects were also investigated. Accuracies relevant to real samples were estimated to range between 76 and 100%, at 0.2 μg/L, and between 84 and 108%, at 1.0 μg/L, in compliance with the EU Regulation 401/2006; the limits of detection and quantification were of 0.08 and 0.24 μg/L, respectively, i.e. much lower than the maximum level currently permitted for OTA in the European Union (2.0 μg/kg, corresponding to ca 2.0 μg/L). 60 different wines produced in the Foggia (Italy) area were analyzed for their OTA content using the developed method and none of them was found to overcome the maximum permitted limit
Le differenze nelle prestazioni degli studenti italiani in PISA 2006 e l'equità del sistema scolastico italiano: due studi
No full textPristine and overoxidized polypyrrole by XPS
No full textAn x-ray photoelectron spectroscopy (XPS) analysis was performed of polypyrroles (PPy) electrosynthesized on Pt in aqueous solution. Spectra were recorded both for the as-synthesized (pristine) polymer (specimen 1) and for the so-called “overoxidized” PPy (specimen 2). Electrosynthesis was accomplished potentiostatically at +0.7 V vs SCE in KCl 10 mM containing pyrrole 0.4 M. Overoxidized PPy was obtained by keeping the pristine polymer at the electrosynthesis potential for 5 h, in phosphate buffer solution (pH 7). C, N, O (1s), and Cl 2p (pristine) spectra are included. Some minor elements, P (in the overoxidized polymer), Na (in some overoxidized samples), and Si (in other samples of both types of PPy, but not in those here reported), were also detected
CARCERE E MUTAMENTO SOCIALE. L'ESPERIENZA SPAGNOLA DAL FRANCHISMO ALLA DEMOCRAZIA
No full textThe main goal of this study is to investigate the transformation of the Spanish penitentiary system in the transition from dictatorship to democracy. This work partly deals with juridical sociology and partly with comparative juridical sociology. It was carried out by collection of data directly from a cluster of prisoners y a cluster of penitentiary operators in the prison of “Quatre Camins” in Barcelona – Spain and approached analysing the possible relationships between two antithetical models of political systems and two models of penal system.
We have tried to give a social and political overview answering questions such as: “How does a penitentiary system changes in the transition from dictatorship to democracy?; What aspects does it preserve and what does it refuse or transform?; Are modern prisons truly inspired to democratic principles?; What is the social depiction of the prison and above all in how many different ways is it depicted in the collective imagination?”
The common sense and the empirical researches indicate a significant difference between the treatment of the prisoners in the democratic regimes and in the totalitarian regimes. In the democratic regimes it is possible to monitor the prison from the outside and to denounce any pathology existing within. In the totalitarian ones the universe of detention is dull and is entrusted to the discretion and the whim of the authority.
The survey carried out suggests further indications. Apart for few changes in terms of quality, some modifications in terms of quantity emerged from the data collected. These changes mark the transition from dictatorship to democracy in Spain. As for quality they concern the function of the prison and the treatment of the prisoners. As for quantity, nowadays as was the case in the period of Franco’s regime, it is difficult for the democratic system to manage the overcrowding of prisoners of greater dimensions respect to the previous ones. The empirical research shows that the overcrowding of penitentiary institutes limits the rehabilitative aim of the prison as the individual treatment and consequently some human rights of prisoners
Towards the quantification of residual milk allergens in caseinate-fined white wines using HPLC coupled with single-stage Orbitrap Mass Spectrometry
No full textDevelopment of a Method for the Quantification of Caseinate Traces in Italian Commercial White Wines Based on Liquid Chromatography-Electrospray Ionization-Ion Trap-Mass Spectrometry
No full textNew findings on polypyrrole chemical structure by XPS coupled to chemical derivatization labelling
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