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acrylic prints alga acrylic prints algae acrylic prints desmid acrylic prints desmids acrylic prints green acrylic prints micrasterias acrylic prints plantae acrylic prints charophyta acrylic prints desmidiaceae acrylic prints eukaryote acrylic prints single acrylic prints cell acrylic prints unicellular acrylic prints bog acrylic prints fresh water acrylic prints

photographs alga photos algae photos desmid photos desmids photos green photos micrasterias photos plantae photos charophyta photos desmidiaceae photos eukaryote photos single photos cell photos unicellular photos bog photos fresh water photos

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Darkfield light micrograph (LM) of Green alga, desmid (Micrasterias sp.). Desmids are a common group of freshwater unicellular, green algae that have intricate cell walls. Micrasterias species are placoderm desmids that have the cell wall divided into two symmetrical halves (semi-cells). The semi-cells are joined by a narrow central region called the isthmus. Visible in this image is a transparent nucleus (grey) that is located in the isthmus region. Each semi-cell contains a single large chloroplast which possess chlorophyll A and B pigments that are used in photosynthesis. Synthesized sugars are stored in small pyrenoids located in the chloroplast. The bright transparent edge is the algal cell wall, with an inner cellulose layer and an outer pectin layer. Micrasterias is the most important genus of desmids for indicating water quality they are extremely sensitive. Magnification: x80 when shortest axis printed at 25 millimetres.

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