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Originally referred to by Haeckel as Navicula lyra.
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Diatoms are algae which live in little glass boxes or frustules - rather like little petri dishes. Pennate diatoms are motile, and rely on, we believe, the excretion of mucus through a slit in the wall - the slit is the raphe and runs down the flat faces of the petri dishes (frustules in diatom terminology). The frustule is perforated with tiny holes to allow the diatom to excrete waste products, and pick up nutrients, dissolved gases etc. from the surrounding water. This image shows the raphe and the pattern of sculpting in the frustule. Phase contrast.
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Specimen were selected from a sample of bottom sediments of a rain storage reservoir in Kiel (Schleswig-Holstein, Germany). The scale bar indicates 50 µm. Image was taken using Zeiss Universal with Olympus C7070 CCD camera.
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Navicula (na-vick-you-la), small to medium pennate diatom, common in sediments. With browny coloured plastid contracted to the centre of the cell. Refractile globules are lipid inclusions. The cell is located within a shell (frustule) made of silica (glass) and the patterns of pores and strengthening elements is used to distinguish different taxa. Differential interference contrast.
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Pinnularia cell in valvar view (above) and an optical median cut in cingular projection showing the nucleus and oil droplets. Scale bar indicates 50 µm. Sample from sphagnum pond situated in the northern alpine region of Austria near Salzburg. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Navicula (na-vick-you-la), small to medium pennate diatom, common in sediments. With browny coloured plastid located around the edges of the cell. Refractile globules are lipid inclusions. The cell is located within a shell (frustule) made of silica (glass) and the patterns of pores and strengthening elements is used to distinguish different taxa. Differential interference contrast.
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Two kinds of specialized membrane-bound organelles, the brown chloroplast and the stringy-looking mitochondria, are clearly visible inside this Navicula.
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Collected from Cumloden Swamp on April 18, 2004.
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A common planktonic pennate diatom.
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Gyrosigma (gyre-o-sig-ma), this is a pennate diatom, and this detail shows the pattern of striae (holes) on the frustule. This square packed pattern to either side of the raphe allows this genus to be distinguished from the superficially similar Pleurosigma. Differential interference contrast.
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Gyrosigma observed in freshwater 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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Gyrosigma observed in freshwater 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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Gyrosigma 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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Valve view of the cleaned frustule showing the surface tolology of the cell. Differential interference contrast micrograph.
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Gyrosigma sp. (pennate diatom) is a benthic alga in Lake Kinneret that at times appears in the plankton, especially near the shore.
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Stauroneis (star-owe-neigh-is), pennate (naviculoid) diatom. The siliceous shell (frustule) has axial raphe and arrays of fine holes which give the frustule its lined appearance. Plastids with chlorophylls a and c, hence the yellow brown colour. Phase contrast.
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Diatoms are algae which live in little glass boxes or frustules - rather like little petri dishes. Pennate diatoms are motile, and rely on, we believe, the excretion of mucus through a slit in the wall - the slit is the raphe and runs down the flat faces of the petri dishes (frustules in diatom terminology). The frustule is perforated with tiny holes to allow the diatom to excrete waste products, and pick up nutrients, dissolved gases etc. from the surrounding water. The one is seriously asymmetric. Phase contrast.