Thalassiosira sp. diatom, light micrograph
Differential interference contrast (DIC) light micrograph of Thalassiosira punctigera, marine diatom colony. Thalassiosira occurs as cells in chains linked by chitin threads. Diatoms are an important part of the phytoplankton in the cold oceans. Sample taken from the North sea in the Netherlands. Magnification: 380x when printed at 10 centimetres wide., Photo by FRANK FOX/SCIENCE PHOTO LIBRARY
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