Affiliation: | (1) Department of Microbiology Cuban Research Institute of Sugar cane by-products, P.O. Box 4026, C.P. 11000 C. Habana;(2) Department of Biotechnology and Bioengineering, Center of Research and Advanced Studies, I.P.N., Mexico, D.F.;(3) Genetic Engineering and Biotechnology Center, C. Habana, Cuba |