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Note that the delicate spines are chitinous. Focus on valve surface. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Thalassiosira (tha-lassy-owe-sire-a) eccentrica is one of the hundred or so species in the diverse and common genus of centric diatoms frequently found in marine waters. Some species can be very large. Species are distinguished primarily by the pattern of sculpting in the valve elements of the shell or frustule. The cell to the left is seen in girdle view, the one to the right in valve view. The margins of the valves give rise to a small number of fine chitinous filaments which are believed to function in flotation. These filaments are evident in arising from the cell to the right. With many small golden plastids. Phase contrast microscopy.
data on this strain.
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Chain of Porosira glacialis. Note that the delicate spines are chitinous. Focus on frustule surface. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Inside view of lacunate valve. Note the position of the fultoportula on a valve face stria, taking the place of an areola. Specimen from single cell culture from Cleveland Harbor, Cleveland, Ohio, by E. Theriot.
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This image was made from samples taken during a scientific cruise in the Pacific. Water was filtered to concentrate the organisms that were present, then dried onto a thin sheet of plastic and then shadowed with a fine layer of metal to provide contrast. The preparation was then observed with an electron-microscope. This technique has been used to document the diversity of marine microbes, especially, protists in the oceans.
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Marginal silica processes are visible. Scale bar indicates 25 µm. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Thalassiosira (tha-lassy-owe-sire-a) eccentrica is one of the hundred or so species in the diverse and common genus of centric diatoms often found in marine waters. Some species can be very large. Species are distinguished primarily by the pattern of sculpting in the valve elements of the shell or frustule. This species has a seven-fold symmetry in the strutting which lies immediately below the surface of the valve, and can be seen in this isolated valve. Differential interference microscopy.
data on this strain.
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Chain of Porosira glacialis. Note that the delicate spines are chitinous. Focus on cell center showing cytoplasmic accumulation around the nucleus. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Scanning electron micrograph of interior of scutate valve. Note position of fultoportula in central area of valve face. Specimen from culture of cell isolated from Cleveland Harbor, Cleveland, OH, USA, by E. Theriot.
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Cells at two focal levels. Material from a plankton tow off Martha's Vineyard, Massachusetts. Image by Jeff Cole.
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Thalassiosira (tha-lassy-owe-sire-a) eccentrica is one of the hundred or so species in the diverse and common genus of centric diatoms often found in marine waters. Some species can be very large. Species are distinguished primarily by the pattern of sculpting in the valve elements of the shell or frustule, and this shows the surface of an isolated valve. Differential interference microscopy.
data on this strain.
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Closeup of Porosira glacialis chain. Note that the delicate spines are chitinous. Focus on frustule surface. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Thalassiosira (tha-lassy-owe-sire-a) eccentrica is one of the hundred or so species in the diverse and common genus of centric diatoms frequently found in marine waters. Some species can be very large. Species are distinguished primarily by the pattern of sculpting in the valve elements of the shell or frustule. The margins of the valve have a number of stout processes and these give rise to the chitinous threads. This is a girdle view and shows the processes as well as the plastids.
data on this strain.
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Closeup of Porosira glacialis chain. Note that the delicate spines are chitinous. Focus on cell center showing cytoplasmic accumulation around the nucleus. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Cyclotella (sike-low-tell-a). Centric diatom, seen from valve view. Three plastid profiles are visible around the periphery of the cell. Long thin organic spines project from the cell - and are believed to have a role in flotation. The pattern of pores in the frustule is used in identification. Marine. Phase contrast.
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Thalassiosira (tha-lassy-owe-sire-a) eccentrica is one of the hundred or so species in the diverse and common genus of centric diatoms commonly found in marine waters. Some species can be very large. Species are distinguished primarily by the pattern of sculpting in the valve elements of the shell or frustule. This is the valve view showing the sculpting of the valve and the underlying plastids. Differential interference microscopy.
data on this strain.
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Cyclotella (sike-low-tell-a). Centric diatom, seen from valve view. Three plastid profiles are visible around the periphery of the cell. Long thin organic spines project from the cell - and are believed to have a role in flotation. The pattern of pores in the frustule is used in identification. Marine. Phase contrast.
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Thalassiosira (tha-lassy-owe-sire-a) eccentrica , is one of the hundred or so species in the diverse and common genus of centric diatoms commonly found in marine waters. Some species can be very large. Species are distinguished primarily by the pattern of sculpting in the valve elements of the shell or frustule. This is the girdle view showing the plastids located near the valves and a central nucleus. Differential interference microscopy.
data on this strain.