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The Cell Wall of Scenedesmus quadricauda

T. Bisalputra and T. E. Weier
American Journal of Botany
Vol. 50, No. 10 (Nov. - Dec., 1963), pp. 1011-1019
Stable URL: http://www.jstor.org/stable/2439909
Page Count: 9
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The Cell Wall of Scenedesmus quadricauda
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Abstract

Fine structure of the cell wall of Scenedesmus quadricauda fixed in both KMnO4 and osmium tetroxide is described. The cell wall consists of 3 layers: the inner cellulosic layer which delimits individual cells; the outer pectic layer which binds the cells of the coenobium together; and a thin middle layer, bounded by membranes on either side, which is electron-dense in osmium-fixed material but of medium electron density in KMnO4. The structure of the outer pectic layer is similar in both fixatives; it consists of a hexagonal network of electron-dense material on the surface, and a system of tubules or "props" which radiate out from the middle layer of the wall to support the net. The pectic layer appears in the daughter coenobia before their liberation from the parent colony.

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