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- W1495211154 abstract "During growth in fluid medium, most strains of Mycoplasma pneumoniae produce free-floating granules which become larger with time. We have called these granules “spherules.” This study describes the morphological and ultrastructural features of M. pneumoniae strain AP-164 spherules, both free and in association with HeLa cells in cell culture. In thin section, spherules were composed of lobulated cells, connected together by membranes, and ring-shaped cells. The two-dimensional morphology observed varied according to the plane of section and to the age of the culture. In HeLa cell cultures, mycoplasmata were found attached to plasma membranes of cells; in sections, individual mycoplasmata were often aligned in radial apposition to the membranes. Mycoplasmata were not found intracellularly. The three-dimensional morphology of spherules was examined by the critical point method and by scanning electron microscopy. Both methods revealed lobulated forms, ring-shaped forms, and star-shaped forms. Treatment of the spherules with crude porcine pancreatic lipase effectively released large numbers of free organisms. Phosphotungstic acid preparations of these uncentrifuged forms revealed a morphology in agreement with the other methods used. Lobulated ring forms with “beaded” filaments were prominent. In respect to morphology, M. pneumoniae under our conditions resembles that of the type species M. mycoides ." @default.
- W1495211154 created "2016-06-24" @default.
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- W1495211154 date "1971-06-01" @default.
- W1495211154 modified "2023-10-11" @default.
- W1495211154 title "Morphology and Ultrastructure of<i>Mycoplasma pneumoniae</i>Spherules" @default.
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- W1495211154 doi "https://doi.org/10.1128/jb.106.3.1005-1015.1971" @default.
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