Citation: D. Ikemeyer et al., SEASONAL-CHANGES IN THE ACTIVITIES OF APOPLASTIC, CYTOPLASMIC, IONICALLY AND COVALENTLY BOUND ISOPEROXIDASES FROM NORWAY SPRUCE (PICEA-ABIES (L) KARST) NEEDLES - A COMPARISON BETWEEN 3 COLLECTION SITES WITH DIFFERENT AMBIENT OZONE CONCENTRATIONS, Zeitschrift fur Naturforschung. C, A journal of biosciences, 48(11-12), 1993, pp. 903-910