1. Core Facility Cell Imaging and Ultrastructure Research; University of Vienna; Althanstrasse 14 A-1090 Vienna Austria
2. Department of Botany; University of the Punjab, Quaid-e-Azam Campus; Lahore 54590 Pakistan
3. Department of Limnology and Bio-Oceanography; University of Vienna; Althanstrasse 14 A-1090 Vienna Austria