Experimental investigation on the efficiency of zinc(II) recovery from waste streams by TBP liquid-liquid extraction

In many industrial processes the presence of zinc in the wastewater may represent an obstacle to its high efficient regeneration. This is the case of the treatment of spent pickling solutions aiming the recovery of hydrochloric acid via pyrohydrolysis techniques. Hydrochloric spent pickling solutions from steel processing contain relevant amount of metals such as iron (Fe) and zinc (Zn) that may significantly affect recovery of hydrochloric acid (HCl) through pyrohydrolysis. In fact, although Fe may be recovered as ferric oxide (Fe2O3) and does not have a substantial effect on pyrohydrolysis process, zinc chloride (ZnCl2) evaporating can occlude nozzles and stick to the pyrohydrolysis react…

Preparazione e caratterizzazione di polimeri biodegradabili caricati con riempitivi naturali

USE OF BIODEGRADABLE POLYMERS FOR FOAM EXTRUSION

Effetto della presenza di piccoli quantitativi di PLA nel riciclo di contenitori in PET

Non-canonical roles of caspase-8 in MDA-MB-231 breast cancer cell line

Caspase-8 (casp-8) is well known as an initiator caspase involved in cell death signalling, although its activity in many cancer cell types seems to work under non-apoptotic conditions. Moreover, in several types of cancer, casp-8 is only rarely mutated and often its expression is very elevated. Since cancer cell growth also depends on evasion of apoptosis, the upregulation of casp-8 in tumours may suggest one or more non-apoptotic roles (1). Here we report our recent studies carried out in MDA-MB-231 cells, derived from clinically aggressive forms of Triple-Negative Breast Cancer, where we have assessed the non-canonical roles of casp-8. Firstly, we evaluated casp-8 mRNA and protein levels…

Recovering of zinc(II) from spent pickling solutions by liquid-liquid extraction

Hydrochloric acid can be successfully recovered from spent pickling liquors with high efficiencies via pyrohydrolysis techniques. In the pickling solution feed, other metallic ions are typically present besides iron (mainly Fe2+) such as zinc(II). In order to avoid undesirable effects, zinc(II) has to be removed, because zinc chloride evaporates and sticks to the reactor walls, as well as it contaminates iron oxides product1. Moreover, zinc recovery is economically affordable because it allows the marketing of some products such as ZnCl2 and ZnSO4. In the present work, liquid-liquid extraction process has been selected to recover zinc(II) from pickling liquors, using suitable extractant age…

AORTIC STIFFNESS IS INCREASED IN NORMOTENSIVE PATIENTS WITH SYSTEMIC LUPUS ERYTHEMATOSUS

INTRODUCTION: Patients with systemic lupus erythematosus (SLE) have a 4- to 10-fold increased risk of developing cardiovascular (CV) events compared with the general population. The enhanced CV risk conferred by SLE may in part be mediated through preclinical CV damage. Large artery stiffness is usually assessed by measuring aortic pulse wave velocity (aPWV), a marker of early vascular aging (EVA) and an independent predictor of adverse CV prognosis. Several studies examined aortic stiffness in SLE with inconsistent results. AIM: To evaluate aPWV and the prevalence of EVA in a group of normotensive patients with SLE and to compare these values with those obtained in age- and gender- matched…

RECYCLING AND THERMOMECHANICAL DEGRADATION OF POLYETHYLENE/ORGANO-MODIFIED CLAY NANOCOMPOSITES

Recycling and Thermomechanical Degradation of LDPE/Modified Clay Nanocomposites

Degradazione di nanocompositi polimerici

Simulation of a regeneration plant for spent pickling solutions via spray roasting

Nowadays, pyrohydrolysis techniques are widely applied for regeneration of spent pickling liquors providing an excellent environmental and economical strategy to the problem of waste disposal/recovery, also thanks to the high acid recovery efficiencies (>99%) achieved1. In fact, in these processes, iron chlorides are converted into iron oxides and hydrogen chloride at high temperature in spray roasting or fluidized bed reactors2. Though the state-of-the-art technologies have been successfully applied only to large scale plants, the development of small scale units, able to perform a delocalized regeneration of spent solutions where these latter are actually produced, would be strongly ne…

Effect of reprocessing on the properties of Polyethylene/cloisite 15A nanocomposites

PREVALENZA DI IPERTROFIA VENTRICOLARE SINISTRA NELL’IPERTENSIONE ARTERIOSA: RIVALUTAZIONE CON I NUOVI CUT-OFF

Nelle linee guida 2013 ESH/ESC per il trattamento dell’ipertensione arteriosa si consiglia di utilizzare come cut-off per l’ipertrofia ventricolare sinistra (LVH) valutata con ecocardiografia, 95 g/m2 per il sesso femminile e 110 g/m2 per il sesso maschile e spessore parietale relativo (RWT) 0,42 per differenziare la forma concentrica dalla forma eccentrica. Tali cut-off sono diversi da quelli suggeriti nella versione precedente delle linee guida (110 g/m2 per il sesso femminile, 125 g/m2 per il sesso maschile e 0.45 per RWT). Scopo del presente studio è di valutare se tale variazione abbia determinato variazioni di rilievo nella valutazione della prevalenza di LVH nei pazienti ipertesi. A …

Preparation of functionalized-MW-CNTs/Polyolefin nanocomposites and analysis of their physical properties

Correlations between non ivasive renal index and markers of atherosclerosis in lupus patients

Recent data suggest that renal hemodynamic parameters obtained by duplex Doppler sonography, especially the intrarenal resistive index (RI), may be associated with systemic vascular changes in some groups of patients. However, conflicting data exist about the relationship between aortic stiffness and RI in autoimmune disease, like systemic lupus erythematosus, characterized by high and early incidence of atherosclerotic disease. The aim of this study was to evaluate the relationship between RI and arterial stiffness, assessed by aortic pulse wave velocity (aPWV), and carotid atherosclerosis, evaluated by intimal medial thickness measurement (IMT) in patients with SLE. DESIGN: Cross-sectiona…

Compression and injection molding of recycled polyethylene for greenhouses in presence of the natural fibres

EARLY VASCULAR AGEING IN NORMOTENSIVE SUBJECTS WITH SYSTEMIC LUPUS ERYTHEMATOSUS. COMPARISON WITH YOUNG HYPERTENSIVE PATIENTS

Objective: Aortic pulse wave velocity (aPWV), is one of the most important markers of vascular aging. It is well known that connective tissue diseases are associated with accelerated atherosclerosis, but only a few data are available about aPWV in patients with systemic lupus erythematosus (SLE). The aim of this study was to evaluate early vascular aging, assessed by measuring aPWV, in a group of normotensive patients with SLE and to compare these subjects with a group of young essential hypertensive (EH) individuals Design and method: Crosssectional study. We have enrolled 39 normotensive SLE subjects (mean age: 38.7±8.3 years) matched for age with a group of essential hypertensive patient…

Preparazione e lavorabilità per estrusione e stampaggio ad iniezione di PLA

Effetto del flusso elongazionale su nanocompositi a base di miscele polimeriche.

Scopo di questo lavoro è stato, pertanto, quello di studiare l’effetto del flusso elongazionale su nanocompositi a base di miscele poliammide/polietilene al fine di valutare come questo possa influenzare e modificare le principali proprietà. In particolare, si è osservato come variano le proprietà meccaniche fra il materiale isotropo (piastrine ottenute per stampaggio a compressione) e il materiale orientato ottenuto per filmatura in bolla.

Presenza di PLA nel riciclo di PET

Green Composites a base di materie plastiche post-consumo e cariche organiche naturali

Miscele PE/PA6: transizione fragile-duttile indotta dall’orientazione

Characterization of polyethylene/calcium carbonate nanocomposites

Influence of PLA on the recycling of PET bottles

Early vascular aging in normotensive subjects with systemic lupus erythematous. Comparison with young hypertensive patients

early vascular aging

[OP.5C.05] SERUM URIC ACID IS INCREASED IN NORMOTENSIVE OBESE CHILDREN WITH A PARENTAL HYSTORY OF HYPERTENSION

Objective: Increased uric acid levels are closely associated with new-onset hypertension in children, and pilot studies showed that pharmacological lowering of uric acid may reduce blood pressure (BP) in obese pediatric patients. Nevertheless, controversy remains concerning a direct causative role of serum uric acid (SUA) in the pathogenesis of essential hypertension (EH). Our study was aimed to determine if normotensive obese children and adolescent offspring of adults with EH show SUA levels different than those of pediatric subjects in whom there is non family history of EH. Design and method: Fifty-nine obese normotensive children and adolescents, attending for metabolic assessment the …

RELAZIONI TRA PARAMETRI LIPIDICI E MASSA VENTRICOLARE SINISTRA IN SOGGETTI CON IPERTENSIONE ARTERIOSA ESSENZIALE

Dati non univoci sono riportati in letteratura sul ruolo della dislipidemia nello sviluppo dell’ipertrofia ventricolare sinistra. Scopo del nostro studio, è stato quello di valutare le potenziali associazioni dei principali parametri lipidici con la massa ventricolare sinistra (LVM) in pazienti con ipertensione essenziale (EHs). Abbiamo arruolato 724 soggetti con EH (età media 45±12 anni; 63% maschi), senza complicanze cardiovascolari e non trattati con farmaci ipolipemizzanti. In tutti i soggetti dono stati dosati la colesterolemia totale (Tchol), la trigliceridemia (TG) e il colesterolo HDL (HDLc). Il colesterolo LDL (LDLc) è stato stimato con la formula di Friedewald ed è stato calcolato…

Characterization of organic fillers-polypropylene composites