1,890 research outputs found
Evaluation of benzene exposure in petrol pump attendants and in mechanics by urinari trans, trans-muconic acid (t, t-MA) determination
No full textOccupational exposure to benzene in petrol pump attendants and in mechanics was studied by examining the benzene content in both the air breathed and in the urinary metabolite trans,trans-muconic acid (t,t-MA).
Thirty petrol pump attendants and thirty mechanics (as exposed workers) and thirty adult male office workers
(as non exposed workers) were involved in the study. Measures were taken at the begin and at the end of the
working shifts. The benzene concentrations in the breathing air samples varied from 2 to 88 μg m3 , lower than
the EU acceptable limit for occupational environment. The average urinary t,t -MA in the petrol pump
attendants at the begin and at the end of the working shifts ranged between 133 ± 69 and 255 ± 174 μg g-1
creatinine and in the mechanics between 204 ± 139 and 300 ± 211 μg g-1 creatinine, respectively. In all the
participants the mean levels of urinary t,t-MA at the end of the working shifts were significantly higher than
those at the beginning. In the exposed workers mean levels of urinary t,t-MA were significantly higher than in
those of the non-exposed workers. The influence of the smoking was demonstrated by the urinary t,t-MA
levels in smoking non-exposed subjects
Senate Bill 1205 - Elaine Maimon Email to Ed Cirillo
No full textabstract: This email from Elaine Maimon to Ed Cirillo discusses SB 1205 and the House Education Committee
Ricerca e caratterizzazione di micro e nano plastiche in alimenti, fluidi biologici e ambienti lavorativi del settore plastico
No full textUno degli aspetti più insidiosi dell’inquinamento causato dalla plastica è dovuto alla presenza di micro e nano plastiche nell’ambiente, si tratta di un problema che è stato
investigato solo di recente e sul quale non vi è ancora una letteratura scientifica consolidata. L’attenzione della comunità scientifica e dell’opinione pubblica è in crescita su questi nuovi inquinanti a seguito della scoperta di microplastiche nell’ organismo umano e negli alimenti, ciò sta lentamente portando i legislatori di vari paesi e dell’Unione Europea ad intervenire sul problema. Questo intervento sta riguardando attualmente la limitazione dell’immissione di plastiche e microplastiche nell’ambiente, ma in futuro potrebbe concretizzarsi ad esempio nell’imposizione di limiti di legge alla contaminazione di microplastiche degli alimenti e nei luoghi di lavoro, di conseguenza vi è la necessità di disporre di un metodo di analisi delle microplastiche per poter valutare l’ampiezza del problema. Lo scopo di questa tesi è di approfondire la conoscenza della contaminazione da microplastiche tramite lo studio, la valutazione e l’impiego di una serie di metodi per l’analisi delle microplastiche in diverse matrici. Questa tesi si concentra sull'analisi delle microplastiche nel sale, un ingrediente presente nella stragrande maggioranza degli alimenti, sul quale vi sono pochi studi, nonostante provenga in gran parte dall'evaporazione dell'acqua di mare dove è nota da tempo la presenza di importanti concentrazioni di microplastiche. Un'altra fonte di assunzione delle microplastiche analizzata da questo studio è l'esposizione professionale alle polveri di microplastiche, sulla quale non vi sono ancora importanti studi; infine è stato studiato un protocollo per l'analisi dei traccianti organici delle microplastiche nei liquidi biologici, nello specifico gli esteri dell'acido ftalico, la cui presenza nelle urine è correlata all'esposizione
dell'organismo alle microplastiche. Questo dottorato di ricerca ha compreso delle attività che sono state svolte presso il dipartimento di ingegneria dell'Università di Aalborg,
Danimarca, grazie alla collaborazione con il prof. Vollertsen tramite un progetto di mobilità congiunta coordinato dalla prof.ssa Buiarelli; altre attività sono state svolte presso il
dipartimento di agricoltura, ambiente ed alimenti dell’Università degli Studi del Molise grazie alla collaborazione del prof. Avino.The presence of micro and nano plastics in the environment is one of the most insidious aspects of plastic pollution, the scientifical investigation of this environmental problem
has started recently and there isn’t a consolidated scientific literature about this important issue. The concern of the scientific community and public opinion on these new pollutants grows by the discovery of microplastics in the human body and in food. The concern about microplastics is slowly leading the United States of America, the
European Union and various other countries to act on the problem. These actions against microplastics pollution are currently concerning limitation of plastics release
into the environment and a ban on microplastic additives in personal care products. The concern of microplastics could lead to imposition of legal limits on microplastics
contamination of foods and workplaces, so we need a method for microplastics analysis that quantifies the microplastic contamination. The purpose of this thesis is to increase
the knowledge of microplastic contamination using of a series of methods for the microplastics analysis in environments and products. This thesis focuses on microplastics analysis in table salt, an ingredient widely used in foods. There are few scientifical articles about microplastics in table salt despite it mostly comes from the evaporation of sea water where there is an important presence of microplastics. The worker’s exposure to microplastic dusts, on which there are still few studies, is another source of microplastics intake that is analyzed by this thesis. The last part of this thesis is about the human body exposure by microplastics. It concerns the development of an analysis method for phthalic acid esters, who are plastic additives, in urine because the concentration of phthalic acid esters in urine is related to human body exposure by microplastics. The analysis of microplastics in table salt has happened with the dissolution of the table salt samples in water, followed by the filtration of the saline solutions, in the end the filters are observed with an optical microscope and certain fibers on the filter are analyzed with the Raman spectroscopy. The other method used for the table salt analysis has required a more complex pretreatment o the sample followed by an imaging analysis micro-FT-IR and an imaging micro-Raman. The microplastics in the workplaces dust are sampled with a filter linked with an air pump, then the filters are observed with an optical microscope and certain fibers on the filter are analyzed with the Raman spectroscopy. The development of the method for phthalic acid esters analysis has brought to a solid phase extraction (SPE) of the analytes from the urine simulating solution followed by an analysis with gas chromatography (GC-FID). The results of this three-years work shows that the analysis of microplastics is complex for the great diversity of the various kind of microplastics, by dimensions and chemical properties. For this reason, the method for analyze the microplastics should use various kind of scientifical instruments, whose results are complementary to determinate the true degree of microplastics contamination
Education Therapeutique sur l'alimentation de patients en surpoids et obeses dans le sud de l'Italie
No full textIl lettore ritrovato: Cirillo Giustiniani e il ms. Auct. T. 5. 21 del Romanzo di Alessandro
No full textMs. Auct. T. 5. 21 of the λ version of the Alexander Romance is precisely dated (1516) and offers three notes which give us the name of one of its owners and readers, Cirillo Giustiniani, archbishop of Grevena. This article provides a new reading and a new interpretation of these notes, supported by findings in the historical archives of the Congregazione per la Dottrina della Fede
Carteggio Domenico Comparetti Gherardo Nerucci
No full textNegli anni settanta Sebastiano Timpanaro invitò i filologi a indagare la corrispondenza di Comparetti con Nerucci, come fonte per la ricostruzione della prima fase comparettiana.Il Carteggio Domenico Comparetti-Gherardo Nerucci non solo realizza quel voto, ma apre nuovi e significativi scenari che fanno luce sulla situazione della filologia classica italiana nella seconda metà dell'Ottocento,sui suoi rapporti con le discipline linguistiche e archeologiche,sul confronto, infine,con la scienza europea, in particolare con le grandi scuole sviluppatesi in area germanica
Education Therapeutique sur l'alimentation de patients en surpoids et obeses dans le sud de l'Italie
No full textPersistence Exponent in Superantiferromagnetic Quenching
No full textWe measure the persistence exponent in a phase separating two-dimensional spin system with non-conserved dynamics quenched in a region with four coexisting stripe phases. The system is an Ising model with nearest neighbor, next-to-the-nearest neighbor and plaquette interactions. Due the particular nature of the ground states, the order parameter is defined in terms of blocks of spins. Our estimate of the persistence exponent, ` = 0:42, differs from those of the two-dimensional Ising and four state Potts models. Our procedure allows the study of persistence properties also at finite temperature T : our results are compatible with the hypothesis that ` does not depend on T below the critical point. PACS numbers: 02.50.-r, 05.40.+j, 05.20.-y Typeset using REVT E X Corresponding author I. INTRODUCTION When a system is quenched from a disordered phase into a multiphase coexistence region, ordered domains form randomly and grow in a self-similar way [ 1]. The kinetics of coarsening domai..
- …
