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MO2004: Photomicrograph of valve view of the centric diatom Actinoptychus senarius Ehrenberg 1843. Diatoms are extremely abundant in freshwater and marine ecosystems, it is estimated that 20% to 25% of all organic carbon fixation on the planet is carried out by diatoms.Diameter approximately 100 micrometres,imaged using differential interference contrast.
   
 
   
   
     
 

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