Electron microscopy; proceedings of the Electron microscopy; proceedings of the Stockholm Conference, September, 1956 electronmicrosco00euro Year: 1957 Alveolar Cells from Mammals 245 are often met with the pictures of cristae. More frequently, however, the boundaries of these cristae are not parallel but have narrow passages. Osmiopliilic bodies (tig. 2), first described under the name of ''Plasmasome'' by Kisch (5) and by various authors, are permanent structures pertaining to the large alveolar cells. They have two aspects depending on their state of completeness. When entire they are oval
Electron microscopy; proceedings of the Electron microscopy; proceedings of the Stockholm Conference, September, 1956 electronmicrosco00euro Year: 1957 Alveolar Cells from Mammals 245 are often met with the pictures of cristae. More frequently, however, the boundaries of these cristae are not parallel but have narrow passages. Osmiopliilic bodies (tig. 2), first described under the name of ''Plasmasome'' by Kisch (5) and by various authors, are permanent structures pertaining to the large alveolar cells. They have two aspects depending on their state of completeness. When entire they are oval, with a size of micron along the major axis. They consist of laminated or tubular elements with very dense outer limits, the middle region being less dense. The thickness of the lamellae for sheets) is about 250 A, corresponding to that of the mitochondrial cristae. Moreover, the dark limits are often joined together, as those of the mitochondrial cristae. The structural elements are very often concentric and scaled or folded. They are sometimes parallel, rather like the mitochondrial cristae. The various observations mentioned above prompt us to suggest that osmiophilic bodies are derived from mitochondria. The cristae could have become more frequent and elongated, laden with lipids which had possibly come from the partial decomposition o\ the mitochondria; this would account for the electron density after osmic fixation. We also think that these bodies can come out of the cell, because free bodies have been observed outside the cyto- plasm. When the osmiophilic bodies are incomplete, they make the bounds of a transparent cavity in the cyto- plasm: this cavity is carpeted with some dense frag- ments which are the remains ol the whole body. These cavities perhaps correspond to the vacuoloids which are observed with the light microscope in certain alveolar cells. In this condition they reach or exceed 1 micron in diameter. The (ioti;i apiniratiis consists t)f little groups
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