1. Institute
for Pharmaceutical Biology, University of Bonn, Nussallee 6, D-53115 Bonn, Germany
2. Department
of Pharmacognosy and Tissue Culture, National Organization for Drug Control and Research, Cairo, Egypt
3. UCIBIO-REQUIMTE,
Departamento de Ciências da Vida, Faculdade de Ciências
e Tecnologia, Universidade Nova de Lisboa, Caparica 2829-516, Portugal