[Progress in Biotechnology] Stability and Stabilization of Biocatalysts, Proceedings of an International Symposium organized under auspices of the Working Party on Applied Biocatalysis of the European Federation of Biotechnology, the University of Cordoba, Spain, and the Spanish Society of Biotechnology Volume 15 || Effect of a mixed stabilizer-denaturant system on the stability of enzyme activity at high temperatures : lysozyme as a model