Acknowledgements
The authors thank Apulia Region, which supported this work by
a scholarship for applied research (POR Puglia 2000–2006, Misura
3.12, Action-A1, Avviso 22/2006). Moreover, they thank Mrs
Simona Valenzano and the staff of Fra.Va. srl Rutigliano (Bari,
Italy) for their kind hospitality during the experimental trials.