The fine cellulose spins which supports floating are visible. indicates 5 µm.
Specimen from cell culture of University of Cologne CCAC, number M1253/1. Link: http://www.ccac.uni-koeln.de/. Sample material courtesy of AG Boenigk, University Duisburg-Essen. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with DSLR Canon 600 D.
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Wolfgang Bettighofer, www.protisten.de.