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Diatom. Cell observed in sandy and muddy marine 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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Diatom. Cell observed in sandy and muddy marine 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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Amphora. Cell 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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Bacillaria. Colony observed in sandy and muddy marine sediments in the vicinity of Broome, Western Australia in September 2003. This work was supported by the Australian Biological Resources Study.
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Cylindrotheca is a elongate pennate diatom is very common in sediments - the form apparently allowing the cell to penetrate through the pores of the sediments. Pennate diatoms are important in intertidal and illuminated subtidal sediments in marine ecosystems and primary producers. Pennate diatoms are capable of movement, relying on the raphe to produce thrust. Pennate diatoms are usually regarded as boat shaped, although some of the boats have very odd shapes. They can usually glide. Although enclosed in a siliceous shell, the shell of these rather delicate diatoms is flexible. The plastids contain chlorophylls a and c which gives the yellowy-brown colour. Phase contrast.
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Cylindrotheca is a elongate pennate diatom usually found in sediments. Pennate diatoms are important in intertidal and illuminated subtidal sediments in marine ecosystems and primary producers. Pennate diatoms are capable of movement, relying on the raphe to produce thrust. Movement is needed so that diatoms can move towards the light, recover their location after disturbances by overlying water currents, wave actions, animal burial and so on. Several species illustrated to right. All have a siliceous shell (frustule) and chlorophyll a/c rich plastids. Phase contrast.
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Cylindrotheca. 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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Entomoneis (ent-owe-moan-aye-is) is a pennate diatom in which the frustule has a spiral twist. Golden brown plastids. Some say this genus cannot be distinguished from Amphiprora. This may be E. alata. Differential interference microscopy.
data on this strain.
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Entomoneis (ent-owe-moan-aye-is) is a pennate diatom in which the frustule has a spiral twist. This image shows an empty siliceous frustule. Some say this genus cannot be distinguished from Amphiprora. This may be E. alata. Differential interference microscopy.
data on this strain.
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Diatom with strongly developed internal intrusions of the frustule, girdle view.
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Empty frustules by phase contrast microscopy. Generic identity needs to be confirmed.
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Its the thing on the left (the thing on the right is a sand grain). A rather asymmetrical and often twisted pennate diatom, which in this case has valves that are a bit dish-like and are very often twisted. Frustule only, differential interference contrast optics.
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A rather asymmetrical and often twisted pennate diatom, which in this case has valves that are a bit dish-like. This species is common in Alkaline Lake. Frustule and residue of cytoplasm, differential interference contrast optics.
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A rather asymmetrical and often twisted pennate diatom, which in this case has valves that are a bit dish-like. This species is common in Alkaline Lake. Frustule and fragments of cytoplasm, phase contrast optics.
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A rather asymmetrical and often twisted pennate diatom, which in this case has valves that are a bit dish-like. Girdle bands are splitting away from the frustule. This species is common in Alkaline Lake. Frustule only, phase contrast optics.
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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.
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Amphiprora (am-fee-pro-ra). Pennate diatoms are usually regarded as boat shaped, although some of the boats have very odd shapes. They can usually glide. This particular form is very common in sediments - the form apparently allowing the cell to penetrate through the pores of the sediments. Although enclosed in a siliceous shell, the shell of these rather delicate diatoms is flexible. The plastids contain chlorophylls a and c which gives the yellowy-brown colour. Phase contrast.
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Pennate diatom seen in girdle view. The cells are enclosed in siliceous valves. There are typically two valves - a top one and a lower one, and they are joined together with fine bands or girdle strips. This image is a view from the side and shows the girdle strips. Differential interference contrast.
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Pennate diatoms. The cells are enclosed in siliceous valves. There are typically two valves - a top one and a lower one, and they are joined together with fine bands or girdle strips. With plastids containing chlorophylls a and c (they are stramenopiles after all). Genera and species distinguished largely by the shape of the organism and the pattern of pores and sculptings of the siliceous shell or frustule. Pennate diatoms are important in intertidal and illuminated subtidal sediments in marine ecosystems and primary producers. Pennate diatoms are capable of movement, relying on the raphe to produce thrust. Movement benefits diatoms which may move towards the light, recover their location after disturbances by overlying water currents, wave actions, animal burial and so on. Several species illustrated. Phase contrast.
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Public Domain, U.S. Government Work 2011 Barry H. Rosen Courtesy of life.nbii.gov
NBII images
Category hierarchy: Microorganisms | AlgaeDescription: Eunotia chain micrograph. Sample was collected from Silver Springs, Florida.Capture device: Olympus DP71Locality: Latitude: 2.859009900000000e+001; Longitude: -8.119031699999999e+001
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Public Domain, U.S. Government Work 2011 Barry H. Rosen Courtesy of life.nbii.gov
NBII images
Category hierarchy: Microorganisms | AlgaeDescription: Discoid chromatophores and the nucleus easily observed with epifluorescent illumination. Sample was collected from Raccoon River, Iowa.Capture device: DP71Capture details: 400x with microscopeOriginal date: 20091002|||112306Locality: Latitude: 2.859009900000000e+001; Longitude: -8.119031699999999e+001
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Public Domain, U.S. Government Work 2011 Barry H. Rosen Courtesy of life.nbii.gov
NBII images
Category hierarchy: Microorganisms | MicrofloraDescription: Discoid chromatophores and the nucleus easily observed with normal illumination. Specimen was collected from Raccoon River, Iowa.Capture device: DP71Original date: 20091002|||113054Locality: Latitude: 2.859009900000000e+001; Longitude: -8.119031699999999e+001
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Planktoniella sol from the Costa Rica Dome area- Lugol's-fixed.
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Arctic Diatom Thalassiosira sp. from the Chukchi Sea