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acrylic prints algae acrylic prints alga acrylic prints green acrylic prints single acrylic prints cell acrylic prints single cell acrylic prints unicellular acrylic prints dual acrylic prints desmid acrylic prints desmids acrylic prints cosmarium acrylic prints botrytis acrylic prints chlorophyte acrylic prints chloroplast acrylic prints eukaryote acrylic prints

photographs algae photos alga photos green photos single photos cell photos single cell photos unicellular photos dual photos desmid photos desmids photos cosmarium photos botrytis photos chlorophyte photos chloroplast photos eukaryote photos

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Coloured scanning electron micrograph (SEM) of placoderm desmid (Cosmarium botrytis). Desmids are freshwater, unicellular green algae that have a symmetrical appearance. There are two groups of desmids: the Placoderm and the Saccoderm desmids. The placoderm desmid cell is divided in two symmetrical halves (semicells) that show a remarkable variation in shape and surface ornamentation. The placoderm desmid is separated by a median constriction called the isthmus. At cell division the cell splits in two at the isthmus, with each half generating a replica of itself to restore the original shape. Saccoderm desmids have simple shapes, cylindrical or spindle-shaped, and rarely with any isthmus. Their unique shapes are the basis for taxonomic classification. Because desmids thrive in clear and nutrient poor freshwater, they are important to ecologists in assessing and monitoring wetland areas. Magnification: x400 when shortest axis printed at 25

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