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Diatoma (die-at-home-a ... ish), filamentous centric diatom. Cells are not circular in cross section by compressed - as can be seen in the cell to the left. Cell with internal strengthening ridges. Many small peripheral chloroplasts and a central nucleus. May form very long filaments, this sample collected from a large (easily visible with the naked eye) clump. Differential interference contrast.
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Diatoma (die-at-home-a ... ish), filamentous centric diatom. Cells are not circular in cross section but compressed. Cell with internal strengthening ridges. Many small peripheral chloroplasts and a central nucleus. May form very long filaments, this sample collected from a large (easily visible with the naked eye) clump. Differential interference contrast.
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A very common pennate diatom in the summer plankton of Lake Kinneret in recent years. Identification uncertain.
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Diatoma (die-at-home-a ... ish), filamentous centric diatom. Cells are not circular in cross section but compressed. Cell with internal strengthening ridges. May form very long filaments, this sample collected from a large (easily visible with the naked eye) clump. Phase contrast.
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A very common pennate diatom in the summer plankton of Lake Kinneret in recent years.
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Tabellaria (tab-ell-air-ee-a), a colonial pennate diatom. As with all diatoms, cells are enclosed in a siliceous wall. The cells are joined and to end, usually in a zig-zag pattern, sometimes branching. With multiple small chloroplasts. Differential interference contrast.
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Synedra ulna is a pennate diatom, relatively abundant in Lake Kinneret water column in summer/ fall. The specimen was sampled in June 2006.
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Tabellaria (tab-ell-air-ee-a), a colonial pennate diatom. As with all diatoms, cells are enclosed in a siliceous wall. The cells are joined and to end, usually in a zig-zag pattern, sometimes branching. With multiple small chloroplasts. Phase contrast.
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Tabellaria (tab-ell-air-ee-a), a colonial pennate diatom. As with all diatoms, cells are enclosed in a siliceous wall. The cells are joined and to end, usually in a zig-zag pattern, sometimes branching. With multiple small chloroplasts. Differential interference contrast.
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Fragilaria ulna on Mougeotia. The scale bar indicates 50 µm. The specimen was gathered in the wetlands of Oderbruch (Oder valley 100 km north east of Berlin). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA).
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Collected from Cumloden Swamp on October 7, 2002.
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Scale bar indicates 50 µm. Sample from Lake Constance near Bodman. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA).
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Image of the colonial diatom Thalassionema from the waters off Martha's Vineyard. First image by the inaugural protistology workshop team - not bad for starters - eh?
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Striatella (stree-at-ell-a) is a pennate diatom, this cell being seen from the sidle (girdle view). There are numerous girdle bands wrapping around the cell, plastids and nuclei have condensed in the centre of the cell and there are fine cytoplasmic strands leading to the surrounding skeleton or frustule. Phase contrast.