Nitzschia sigmoidea.Detail: Center of the cell in cingular view with nucleus, cloroplasts with oil droplets (energy store) and the canal raphes. Scale bar indicates 25 m.Sample from a wetland at the Pillersee (Tyrol, Austria). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For more look at
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