1. Supported by grants from Fundação, de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and FINEP (Convênio No 4.3.81.0340.00). O. Marinotti is a graduate fellow from FAPESP and A.G. de Bianchi is a staff member of Biochemistry Department and a research fellow from CNPq.
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5. Terra, W.R., Ferreira, C., Bianchi, A.G. de, and Zinner, K., Comp. Biochem. Physiol.68B (1981) 89.