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Vahlkampfia
''Vahlkampfia'' is a genus of amoeboids in Heterolobosea The Percolozoa are a group of colourless, non-photosynthetic Excavata, including many that can transform between amoeboid, flagellate, and cyst stages. Characteristics Most Percolozoa are found as bacterivores in soil, fresh water and occasionall .... References Further reading *Brown, Susan; De Jonckheere, Johan F. (Feb. 25, 1999). "A reevaluation of the amoeba genus Vahlkampfia based on SSUrDNA sequences". ''European Journal of Protistology'' 35 (1):49-54. doi:10.1016/S0932-4739(99)80021-2 * * Percolozoa Excavata genera {{Excavata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vahlkampfia Ciguana
''Vahlkampfia'' is a genus of amoeboids in Heterolobosea The Percolozoa are a group of colourless, non-photosynthetic Excavata, including many that can transform between amoeboid, flagellate, and cyst stages. Characteristics Most Percolozoa are found as bacterivores in soil, fresh water and occasionall .... References Further reading *Brown, Susan; De Jonckheere, Johan F. (Feb. 25, 1999). "A reevaluation of the amoeba genus Vahlkampfia based on SSUrDNA sequences". ''European Journal of Protistology'' 35 (1):49-54. doi:10.1016/S0932-4739(99)80021-2 * * Percolozoa Excavata genera {{Excavata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vahlkampfia Lobospinosa
''Vahlkampfia'' is a genus of amoeboids in Heterolobosea The Percolozoa are a group of colourless, non-photosynthetic Excavata, including many that can transform between amoeboid, flagellate, and cyst stages. Characteristics Most Percolozoa are found as bacterivores in soil, fresh water and occasionall .... References Further reading *Brown, Susan; De Jonckheere, Johan F. (Feb. 25, 1999). "A reevaluation of the amoeba genus Vahlkampfia based on SSUrDNA sequences". ''European Journal of Protistology'' 35 (1):49-54. doi:10.1016/S0932-4739(99)80021-2 * * Percolozoa Excavata genera {{Excavata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vahlkampfia Orchill
''Vahlkampfia'' is a genus of amoeboids in Heterolobosea The Percolozoa are a group of colourless, non-photosynthetic Excavata, including many that can transform between amoeboid, flagellate, and cyst stages. Characteristics Most Percolozoa are found as bacterivores in soil, fresh water and occasionall .... References Further reading *Brown, Susan; De Jonckheere, Johan F. (Feb. 25, 1999). "A reevaluation of the amoeba genus Vahlkampfia based on SSUrDNA sequences". ''European Journal of Protistology'' 35 (1):49-54. doi:10.1016/S0932-4739(99)80021-2 * * Percolozoa Excavata genera {{Excavata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vahlkampfia Signyensis
''Vahlkampfia'' is a genus of amoeboids in Heterolobosea The Percolozoa are a group of colourless, non-photosynthetic Excavata, including many that can transform between amoeboid, flagellate, and cyst stages. Characteristics Most Percolozoa are found as bacterivores in soil, fresh water and occasionall .... References Further reading *Brown, Susan; De Jonckheere, Johan F. (Feb. 25, 1999). "A reevaluation of the amoeba genus Vahlkampfia based on SSUrDNA sequences". ''European Journal of Protistology'' 35 (1):49-54. doi:10.1016/S0932-4739(99)80021-2 * * Percolozoa Excavata genera {{Excavata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vahlkampfia Avara
''Vahlkampfia avara'' is a species of excavates. It has a PAS-positive surface layer and forms cysts in culture. References Further reading * External linksTOLweb entry on genus Percolozoa Species described in 1967 {{Excavata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vahlkampfia Inornata
''Vahlkampfia inornata'' is a species of excavates. It has a PAS-positive surface layer and forms cysts in culture. References External linksTOLweb entry on genus Percolozoa Species described in 1967 {{Excavata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vahlkampfia Jugosa
''Vahlkampfia jugosa'' is a species of excavates. It has a PAS-positive surface layer and forms cysts in culture. References Further reading * External linksTOLweb entry on genus Percolozoa Species described in 1967 {{Excavata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterolobosea
The Percolozoa are a group of colourless, non-photosynthetic Excavata, including many that can transform between amoeboid, flagellate, and cyst stages. Characteristics Most Percolozoa are found as bacterivores in soil, fresh water and occasionally in the ocean. The only member of this group that is infectious to humans is ''Naegleria fowleri'', the causative agent of the often fatal disease amoebic meningitis. The group is closely related to the Euglenozoa, and share with them the unusual characteristic of having mitochondria with discoid cristae. The presence of a ventral feeding groove in the flagellate stage, as well as other features, suggests that they are part of the Excavata group. The amoeboid stage is roughly cylindrical, typically around 20-40 μm in length. They are traditionally considered lobose amoebae, but are not related to the others, and unlike them, do not form true lobose pseudopods. Instead, they advance by eruptive waves, where hemispherical bulges appea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Percolozoa
The Percolozoa are a group of colourless, non-photosynthetic Excavata, including many that can transform between amoeboid, flagellate, and cyst stages. Characteristics Most Percolozoa are found as bacterivores in soil, fresh water and occasionally in the ocean. The only member of this group that is infectious to humans is ''Naegleria fowleri'', the causative agent of the often fatal disease amoebic meningitis. The group is closely related to the Euglenozoa, and share with them the unusual characteristic of having mitochondria with discoid cristae. The presence of a ventral feeding groove in the flagellate stage, as well as other features, suggests that they are part of the Excavata group. The amoeboid stage is roughly cylindrical, typically around 20-40 μm in length. They are traditionally considered lobose amoebae, but are not related to the others, and unlike them, do not form true lobose pseudopods. Instead, they advance by eruptive waves, where hemispherical bulges a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amoeboid
An amoeba (; less commonly spelled ameba or amœba; plural ''am(o)ebas'' or ''am(o)ebae'' ), often called an amoeboid, is a type of cell or unicellular organism with the ability to alter its shape, primarily by extending and retracting pseudopods. Amoebae do not form a single taxonomic group; instead, they are found in every major lineage of eukaryotic organisms. Amoeboid cells occur not only among the protozoa, but also in fungi, algae, and animals. Microbiologists often use the terms "amoeboid" and "amoeba" interchangeably for any organism that exhibits amoeboid movement. In older classification systems, most amoebae were placed in the class or subphylum Sarcodina, a grouping of single-celled organisms that possess pseudopods or move by protoplasmic flow. However, molecular phylogenetic studies have shown that Sarcodina is not a monophyletic group whose members share common descent. Consequently, amoeboid organisms are no longer classified together in one group.Jan Pawlow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptomonad
The cryptomonads (or cryptophytes) are a group of algae, most of which have plastids. They are common in freshwater, and also occur in marine and brackish habitats. Each cell is around 10–50 μm in size and flattened in shape, with an anterior groove or pocket. At the edge of the pocket there are typically two slightly unequal flagella. Some may exhibit mixotrophy. Characteristics Cryptomonads are distinguished by the presence of characteristic extrusomes called ejectosomes, which consist of two connected spiral ribbons held under tension. If the cells are irritated either by mechanical, chemical or light stress, they discharge, propelling the cell in a zig-zag course away from the disturbance. Large ejectosomes, visible under the light microscope, are associated with the pocket; smaller ones occur underneath the periplast, the cryptophyte-specific cell surrounding. Except for the class ''Goniomonadea'', which lacks plastids entirely, and ''Cryptomonas paramecium'' (previo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bacteria
Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of Earth's crust. Bacteria are vital in many stages of the nutrient cycle by recycling nutrients such as the fixation of nitrogen from the atmosphere. The nutrient cycle includes the decomposition of dead bodies; bacteria are responsible for the putrefaction stage in this process. In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. Bacteria also live in symbiotic and parasitic relationsh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
