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Abstract
The Golgi apparatus of a marine chrysophycean alga Pleurochrysis scherffelii Pringsheim produces wall fragments (circular-to-ellipsoidal "scales") which are released to the periphery by an exocytotic process involving the fusion of cisternae and the plasma membrane. The cellulosic component of the scales is a complex network of fibrils (10 to 25 angstroms in diameter) that resist treatment with strong alkali. Untreated washed scales yield galactose, ribose, arabinose, and traces of glucose; alkali-purified scales yield much more glucose. The fibrillar scale constituent shows a positive iodine dichroism of the intact wall, a positive zinc chloride-iodine reaction, breakage sites characteristic of highly crystalline cellulose, and solubility in Schweizer's reagent.
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