1. Institute of Chemical Technology, Department of Fermentation Chemistry and Bioengineering. Technicka 5, 166 28 Prague, Czech Republic; Phone: +(420-2) 2044 3785; Fax: +(420-2) 2044 5051; E-mail: Jan.Paca@vscht.cz
2. Institute of Chemical Technology, Department of Fermentation, Chemistry and Bioengineering. Technicka 5, 166 28 Prague, Czech Republic.
3. University of North Dakota, Department of Chemistry, Grand Forks, North Dakota.