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Chloroflexus (cloe-row-flecks-us) is a filamentous green prokaryote, but not a cyanobacterium. It is common in lower reddish regions of some of the microbial mats which cover the sediments at some of the thermal sites. This is a small piece of such a mat. Material provided by Mike Ferris from Mushroom Spring, a thermal site within Yellowstone National Park, photograph provided by Mike Ferris and David Ward.
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Asnæs
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Anabaena (ann-a-bean-a) one of the filamentous blue green alga which can form heterocysts. Single filaments are attached to the substrate and occur within an irregular mucus sheath which acquires metal salts to become brown in colour. Heterocysts are spherical, more hyaline, slightly larger than other cells and are a site for enhanced nitrogen fixation. Differential interference contrast.
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Chloroflexus (clore-owe-lfex-us), this pair of matched micrographs shows bacteria, (mostly Synechococcus and Chloroflexus) from a mat sample. The phase contrast shot to the left shows the bacteria, the image to the right shows autofluorescence. The Chloroflexus cells do not exhibit autofluorescence. Phase contrast and fluorescence. Material provided by Mike Ferris from Mushroom Spring, a thermal site in Yellowstone National Park, photographs by Mike Ferris and David Patterson.
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Asnæs
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Anabaena (ann-a-bean-a) one of the filamentous blue green alga which can form heterocysts. Single filaments are attached to the substrate and occur within an irregular mucus sheath which acquires metal salts to become brown in colour. The sheath is emphasized in this image. Heterocysts are spherical, more hyaline, slightly larger than other cells and are a site for enhanced nitrogen fixation. Phase contrast.
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Spirulina (spirr-you-line-a) a spiral bacterium, motile, moves by cork-screw motion. A blue-green alga. If the cells are irradiated with ultraviolet light, the pigment absorbs some radiant energy and re-emits at with lower energy - with the colour shifted to the red end of the spectrum. Fluorescence microscopy removes the irradiating ultraviolet light, leaving the red colour of the fluorescing pigments. Fluorescence microscopy.
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Asnæs
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Anabaena (ann-a-bean-a) a filamentous blue green algae, with differentiated cells within the filament or trichome. Differential interference microscopy.
data on this strain.
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Spirulina (spirr-you-line-a) a spiral bacterium, motile, moves by cork-screw motion. Very light pigmentation. Phase contrast.
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Asnæs
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Anabaena (ann-a-bean-a) a filamentous blue green algae, with differentiated cells within the filament. The central cell is a heterocyst, the site of nitrogen fixation. Differential interference microscopy.
data on this strain.
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Spirulina, a spiral-shaped cyanobacterium, is one of the members of the brown mat communities found on Mammoth Terraces.
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Asnæs
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Anabaena (ann-a-bean-a) filamentous blue-green alga (cyanobacterium), some cells are different to others. They are referred to as heterocysts, and seem to be specialised to carry out nitrogen fixation. Differential interference contrast.
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Spirulina has a very distinctive corkscrew form.
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Asnæs
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Anabaena. Cell observed in freshwater sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Spirulina. Cell observed in sandy and muddy marine sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using phase contrast optics. This work was supported by the Australian Biological Resources Study.
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Allindelille Fredskov ved Ringsted
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A gliding filamernt of Anabaena, a couple of heterocysts are visible within the filament.
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Single spiral cell.
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Allindelille Fredskov ved Ringsted
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Filaments of Anabaena. The species may form heterocysts (thick walled cell, lower filament last complete cell on the right) and also resistant cells such as the long cylindrical cell. Phase contrast microscopy.