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Image #   820626-24
Name:   Green alga, desmid (Micrasterias sp.)
Copyright:   Copyright 2012 Dennis Kunkel Microscopy, Inc.
Description:   Caption: 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 & an outer pectin layer. Micrasterias species are highly adapted to nutrient poor, acidic water and are commonly used in environmental protection and management as bioindicators. Micrasterias is the most important genus of desmids for indicating water quality because these algae are extremely sensitive and respond to their immediate environment.
Magnification*: x80
Type: LM Darkfield
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   820626-24 alga algae desmid desmids green alga green algae Micrasterias Plantae Charophyta Zygnemophyceae Desmidiales Desmidiaceae Charophyceae Gamophyceae Micrasterias radiosa eukaryote single cell unicellular unicellular alga unicellular algae unicellular green alga unicellular green algae bog bog desmid fresh water fresh water alga fresh water algae freshwater alga freshwater algae placoderm placoderm desmid placoderm desmids eukaryotes eukaryotic alga eukaryotic algae alga cell wall alga chloroplast alga chloroplasts algal cell wall algal chloroplast algal chloroplasts cell wall cellulose cellulose cell wall chloroplast isthmus nucleus pectin pectin cell wall pectin cell wall layer pectin layer pyrenoid pyrenoids symmetrical symmetrical cell halves symmetrical cell wall symmetrical cell walls LM bilateral symmetry cell symmetry darkfield darkfield illumination symmetry desmid semi-cell semi-cell plant cell wall plant cell walls plant cellulose cell wall plant cellulose wall alga bioindicator algae bioindicator algae bioindicators algal bioindicator bioindicator light micrograph 06.01.12

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