The Experts below are selected from a list of 3 Experts worldwide ranked by ideXlab platform
Rolf Michel - One of the best experts on this subject based on the ideXlab platform.
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a coccoid bacterial parasite of naegleria sp Schizopyrenida vahlkampfiidae inhibits cyst formation of its host but not transformation to the flagellate stage
Acta Protozoologica, 2000Co-Authors: Rolf Michel, Karldieter Muller, Barbel Hauroder, Lothar ZollerAbstract:Summary. A non-thermophilic Naegleria species isolated from an aquarium for ornamental fishes harboured coccoid Gram-negative bacteria of 1µm in diameter as endocytobionts multiplying by binary fission. These intracytoplasmic bacteria, called “KNic” inhibited cy st formation of their host, but not its transformation to the flagellate stage. Consequently the resulting flagellates contained these intracel lular parasites as could be verified by electron microscopy. The endocytic bacteria could not be grown on eight different bacteriological media under va rious atmospheric conditions. The ribbon-like roughly hexagonal surface of the bacteria as shown by SEM is responsible for the spiny appearance a s seen by TEM. The successful axenisation of the infected host amoebae made it possible to harvest pure bacterial suspensions for cocultivatio n assays with different free-living amoebae and Dictyostelium discoideum. As a result, an extremely wide host spectrum of the endocytobionts could be determined including other Naegleria spp., acanthamoebae, and members of the genera Hartmannella, Vahlkampfia, and Balamuthia. Successful infection of four additional Naegleria strains with the coccoid endocytobionts resulted also in impairment of the capability to form cysts but did not interfere with transformation to the flagellate stage. Dictyostelium discoideum as a member of the Acrasiales was also highly susceptible to infection with the Gram-negative bacteria inducing a strong disturbance of their normal aggregation pattern.
Karldieter Muller - One of the best experts on this subject based on the ideXlab platform.
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a coccoid bacterial parasite of naegleria sp Schizopyrenida vahlkampfiidae inhibits cyst formation of its host but not transformation to the flagellate stage
Acta Protozoologica, 2000Co-Authors: Rolf Michel, Karldieter Muller, Barbel Hauroder, Lothar ZollerAbstract:Summary. A non-thermophilic Naegleria species isolated from an aquarium for ornamental fishes harboured coccoid Gram-negative bacteria of 1µm in diameter as endocytobionts multiplying by binary fission. These intracytoplasmic bacteria, called “KNic” inhibited cy st formation of their host, but not its transformation to the flagellate stage. Consequently the resulting flagellates contained these intracel lular parasites as could be verified by electron microscopy. The endocytic bacteria could not be grown on eight different bacteriological media under va rious atmospheric conditions. The ribbon-like roughly hexagonal surface of the bacteria as shown by SEM is responsible for the spiny appearance a s seen by TEM. The successful axenisation of the infected host amoebae made it possible to harvest pure bacterial suspensions for cocultivatio n assays with different free-living amoebae and Dictyostelium discoideum. As a result, an extremely wide host spectrum of the endocytobionts could be determined including other Naegleria spp., acanthamoebae, and members of the genera Hartmannella, Vahlkampfia, and Balamuthia. Successful infection of four additional Naegleria strains with the coccoid endocytobionts resulted also in impairment of the capability to form cysts but did not interfere with transformation to the flagellate stage. Dictyostelium discoideum as a member of the Acrasiales was also highly susceptible to infection with the Gram-negative bacteria inducing a strong disturbance of their normal aggregation pattern.
Barbel Hauroder - One of the best experts on this subject based on the ideXlab platform.
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a coccoid bacterial parasite of naegleria sp Schizopyrenida vahlkampfiidae inhibits cyst formation of its host but not transformation to the flagellate stage
Acta Protozoologica, 2000Co-Authors: Rolf Michel, Karldieter Muller, Barbel Hauroder, Lothar ZollerAbstract:Summary. A non-thermophilic Naegleria species isolated from an aquarium for ornamental fishes harboured coccoid Gram-negative bacteria of 1µm in diameter as endocytobionts multiplying by binary fission. These intracytoplasmic bacteria, called “KNic” inhibited cy st formation of their host, but not its transformation to the flagellate stage. Consequently the resulting flagellates contained these intracel lular parasites as could be verified by electron microscopy. The endocytic bacteria could not be grown on eight different bacteriological media under va rious atmospheric conditions. The ribbon-like roughly hexagonal surface of the bacteria as shown by SEM is responsible for the spiny appearance a s seen by TEM. The successful axenisation of the infected host amoebae made it possible to harvest pure bacterial suspensions for cocultivatio n assays with different free-living amoebae and Dictyostelium discoideum. As a result, an extremely wide host spectrum of the endocytobionts could be determined including other Naegleria spp., acanthamoebae, and members of the genera Hartmannella, Vahlkampfia, and Balamuthia. Successful infection of four additional Naegleria strains with the coccoid endocytobionts resulted also in impairment of the capability to form cysts but did not interfere with transformation to the flagellate stage. Dictyostelium discoideum as a member of the Acrasiales was also highly susceptible to infection with the Gram-negative bacteria inducing a strong disturbance of their normal aggregation pattern.
Lothar Zoller - One of the best experts on this subject based on the ideXlab platform.
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a coccoid bacterial parasite of naegleria sp Schizopyrenida vahlkampfiidae inhibits cyst formation of its host but not transformation to the flagellate stage
Acta Protozoologica, 2000Co-Authors: Rolf Michel, Karldieter Muller, Barbel Hauroder, Lothar ZollerAbstract:Summary. A non-thermophilic Naegleria species isolated from an aquarium for ornamental fishes harboured coccoid Gram-negative bacteria of 1µm in diameter as endocytobionts multiplying by binary fission. These intracytoplasmic bacteria, called “KNic” inhibited cy st formation of their host, but not its transformation to the flagellate stage. Consequently the resulting flagellates contained these intracel lular parasites as could be verified by electron microscopy. The endocytic bacteria could not be grown on eight different bacteriological media under va rious atmospheric conditions. The ribbon-like roughly hexagonal surface of the bacteria as shown by SEM is responsible for the spiny appearance a s seen by TEM. The successful axenisation of the infected host amoebae made it possible to harvest pure bacterial suspensions for cocultivatio n assays with different free-living amoebae and Dictyostelium discoideum. As a result, an extremely wide host spectrum of the endocytobionts could be determined including other Naegleria spp., acanthamoebae, and members of the genera Hartmannella, Vahlkampfia, and Balamuthia. Successful infection of four additional Naegleria strains with the coccoid endocytobionts resulted also in impairment of the capability to form cysts but did not interfere with transformation to the flagellate stage. Dictyostelium discoideum as a member of the Acrasiales was also highly susceptible to infection with the Gram-negative bacteria inducing a strong disturbance of their normal aggregation pattern.
