Abstract
The properties of the soluble β-glucans formed during photosynthesis of the green siphonous alga Caulerpa simpliciuscula are described. There are two components in the soluble β-glucan fraction. One has an apparent degree of polymerization of 37 glucose units and the other of 270 glucose units. The β-glucan with the lower apparent molecular weight accounts for most of the mass in the β-glucan fraction and is similar in properties to soluble laminarins reported in other algal and fungal species. The β-glucan with the high apparent molecular weight contains most of the radioactivity accumulated in the β-glucan fraction during short periods of photosynthesis.
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