. La microscopie électronique ; actes de la Conférence de Stockholm, septembre, 1956. La microscopie électronique. Le tissu adipeux brun dans f/ic Rai 183. b Fig. 1. Partie d'une cellule normale de la graisse brune. Les mitochondries ont surtout cristac régulièrement certains ot" qui sont g (B). Sections Inter- cristal compte pour l'apparition d'organismes tels que (A). Quelques mitochondries vésiculeuses sont membranes internes à un pôle (V) et de petites vésicules sont parfois perçus entre les crêtes (C). Les gouttelettes de lipides sont librement dans le cytoplasme et souvent reliés entre eux. Éléments réticulaire réticulum incluent une composante sacculaire (S) : le

• Contributeur: The Book Worm / Alamy Banque D'Images
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. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. Brown Adipose Tissue in f/ic Rai 183. b Fig. 1. Part of a normal brown fat cell. Mitochondria mostly have regular cristac some ot" which are beaded (B). Inter- cristal sections account for the appearance of such bodies as (A). Some mitochondria have vesicular internal membranes at one pole (V) and tiny vesicles are sometimes seen between the cristae (C). Lipid droplets lie freely in the cytoplasm and often interconnect. Endoplasmic reticular elements include a saccular component (S): the granular component (G) occurs independently, and in association with the saccular component. Magnification 61, 000. The mitochondria are not markedly pleomorphic: although found anywhere in the cytoplasm they are commonly clustered around lipid droplets. From direct measurements their average cross-sectional diameter was calculated as 0.86 //. in some parts of its extent the mitochondrial enclosing membrane may be deficient, and often at points of contact with lipid droplets (fig. 3): osmiophile material may extend between droplet and mitochondrion at such a breach. Mitochondrial internal membranes consist for the most part of double membranes arranged in parallel cristae of varying length (tig. 1) but vesicular components (figs. 1 and 2) may be admixed with the cristae or concentrated towards one pole as observed in the parathyroid mitochondria (9). The intercristal distance may range from 250 to 850 A throughout the tissue, with a narrower variation within individual mitochondria. The thickness of the cristae (double membrane plus contained space) shows a sitnilar individual and general variation between 150 350 A. The broadest cristae are usually most widely separated and are frequently beaded. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not pe

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