Alphaproteobacterium; Alphaproteobacteria

A mass of bacterial endosymbiont Holospora undulata (ex Hafkine, 1890) Gromov and Ossipov, 1981occupying the micronucleus of Paramecium caudatum (Ehrenberg,1833).DIC. A detailed discussion of the genus Holospora is available at http://141.150.157.117:8080/prokPUB/chaprender/jsp/showchap.jsp?chapnum=355&initsec=01_00

TEM image of a cell in a soybean (Glycine max) root nodule with symbiotic nitrogen-fixing Bradyrhizobium japonicum bacteriaLouisa Howard (Dartmouth Electron Microscope Facility) via Wikimedia Commons

A mass of bacterial endosymbiont Holospora undulata (ex Hafkine, 1890) Gromov and Ossipov, 1981occupying the micronucleus of Paramecium caudatum (Ehrenberg,1833).DIC. A detailed discussion of the genus Holospora is available at http://141.150.157.117:8080/prokPUB/chaprender/jsp/showchap.jsp?chapnum=355&initsec=01_00

These cells of the endosymbiont Holospora undulata (ex Hafkine, 1890) Gromov and Ossipov, 1981are escaping from the micronucleus of a ruptured cell of the host, Paramecium caudatum (Ehrenberg,1833). Phase contrast.

These cells of the endosymbiont Holospora undulata (ex Hafkine, 1890) Gromov and Ossipov,1981are escaping from the micronucleus of a ruptured cell of the host, Paramecium caudatum (Ehrenberg,1833).

This is a detail of the grossly swollen micronucleus of a ruptured Paramecium caudatum (Ehrenberg,1833) infected with Holospora undulata (ex Hafkine, 1890) Gromov and Ossipov. The micronucleus has burst releasing individual cells of H. undulata..DIC.

Magnified 1000X, this Liefson’s flagella stained photomicrograph revealed the presence of a number of flagellated Brevundimonas diminuta, formerly known as Pseudomonas diminuta.Created: 1975

Magnified 1000X, this Liefson’s flagella stained photomicrograph revealed the presence of a number of flagellated Brevundimonas diminuta, formerly known as Pseudomonas diminuta.Created: 1975

This 1976 transmission electron micrograph (TEM) depicted a hypertrophic peritoneal mesothelial cell of mouse that had been experimentally infected intraperitoneally with Orientia tsutsugamushi rickettsial micro-organisms. In this photomicrograph there were several organisms visible free within the mesothelial cell's cytoplasm.Created: 1976

This 1978 transmission electron micrograph (TEM) depicted a brain capillary of a mouse that had been experimentally infected intravenously with Orientia tsutsugamushi rickettsial micro-organisms. Revealed by this TEM, was the presence of pericapillary hemorrhage and edema. Several of the O. tsutsugamushi organisms were visible within the cytoplasm of a degenerating capillary endothelial cell.Created: 1978

This 1978 transmission electron micrograph (TEM) depicted a brain capillary of a mouse that had been experimentally infected intravenously with Orientia tsutsugamushi rickettsial micro-organisms. This photomicrograph revealed three O. tsutsugamushi organisms visible within the cytoplasm of the host endothelial cell.Created: 1978

This 1978 transmission electron micrograph (TEM) depicted a brain capillary of a mouse that had been experimentally infected intravenously with Orientia tsutsugamushi rickettsial micro-organisms. This TEM revealed that one organism was budding from the luminal surface of a hypertrophic capillary endothelial cell, still covered by a third layer consisting of the host cell's plasma membrane. Others are visible free within the endothelial cell's cytoplasm.Created: 1978

This 1976 transmission electron micrograph (TEM) depicted a hypertrophic peritoneal mesothelial cell of mouse that had been experimentally infected intraperitoneally with Orientia tsutsugamushi rickettsial micro-organisms. In this TEM, several organisms were visible, free within the host cell's cytoplasm. One O. tsutsugamushi appeared within a phagocytic vacuole, still bearing a third outer membrane layer of probable host cell origin.Created: 1976

This 1976 transmission electron micrograph (TEM) depicted a hypertrophic peritoneal mesothelial cell of mouse that had been experimentally infected intraperitoneally with Orientia tsutsugamushi rickettsial micro-organisms. A disintegrating organism was shown within a host cell's phagocytic vacuole.Created: 1976

This 1976 transmission electron micrograph (TEM) depicted a peritoneal mesothelial cell from a mouse that had been experimentally infected intraperitoneally with Orientia tsutsugamushi rickettsial micro-organisms. Captured here in this TEM was the initiation of the process of phagocytosis being carried out on one of the O. tsutsugamushi micro-organisms.Created: 1976

This 1976 transmission electron micrograph (TEM) depicted peritoneal mesothelial cells from a mouse that had been experimentally infected intraperitoneally with Orientia tsutsugamushi rickettsial micro-organisms. This TEM revealed that the extracellular organisms were covered with a distinct third outer membrane of probable host cell origin.Created: 1976

This 1976 transmission electron micrograph (TEM) depicted a hypertrophic peritoneal mesothelial cell of mouse that had been experimentally infected intraperitoneally with Orientia tsutsugamushi rickettsial micro-organisms. This micrograph showed one organism as it was in the process of budding from the luminal cell surface, still covered by a third layer, consisting of the host cell's plasma membrane. Others are visible free within the host cell's cytoplasm.Created: 1976

This 1976 transmission electron micrograph (TEM) depicted a hypertrophic peritoneal mesothelial cell of mouse that had been experimentally infected intraperitoneally with Orientia tsutsugamushi rickettsial micro-organisms. This particular photomicrograph revealed that there were multiple organisms free within the host cell's cytoplasm.Created: 1978

This 1978 transmission electron micrograph (TEM) depicted a brain capillary of mouse that had been experimentally infected intravenously with Orientia tsutsugamushi rickettsial micro-organisms. This photomicrograph revealed that the capillary lumen was partially occluded by a thrombus, and a hypertrophic, degenerating, apparently detached endothelial cell containing several visible organisms free within its cytoplasm.Created: 1978

This 1978 transmission electron micrograph (TEM) depicted a brain capillary of mouse that had been experimentally infected intravenously with Orientia tsutsugamushi rickettsial micro-organisms. In this micrographic view revealed pericapillary edema, the capillary lumen was partially occluded by a thrombus, and flanking the thrombus, a hypertrophic endothelial cell containing a visible organism free within its cytoplasm.Created: 1978

This 1978 transmission electron micrograph (TEM) depicted a brain capillary of mouse that had been experimentally infected intravenously with Orientia tsutsugamushi rickettsial micro-organisms. In this micrographic view, a host cell endothelial cell was shown to contain many organisms free within its cytoplasm.Created: 1978

This 1976 transmission electron micrograph (TEM) depicted a hypertrophic peritoneal mesothelial cell of mouse that had been experimentally infected intravenously with Orientia tsutsugamushi rickettsial micro-organisms. This micrograph captured a dividing organism while it was visible free within the host cell's cytoplasm.Created: 1976

This 1976 transmission electron micrograph (TEM) depicted a hypertrophic peritoneal mesothelial cell from mouse that had been experimentally infected intraperitoneally with Orientia tsutsugamushi rickettsial micro-organisms. This micrograph captured an organism as it appeared within a phagocytic vacuole. An outer third membrane, of probable host cell origin, was disintegrating, leaving behind only its electron-dense remnants.Created: 1976