Abstract
1. 1. Diatoms in the genera Nitzschia, Phaeodactylum, Amphora, Navicula, Thallasiosira, Biddulphia and Fragilaria were compared for sterol, fatty acid and elemental composition. 2. 2. 24-Methyl-22-dehydrocholesterol (probably the 24S isomer) was the major sterol in five species, 24-ethyl-22-dehydrocholesterol (probably stigma-sterol) was the major sterol in two species and cholesterol the major sterol in one species. Complex mixtures of sterols occurred in three species. 3. 3. Palmitoleic, palmitic, eicosapentaenoic and myristic acids were the most prevalent fatty acids. Eighteen-carbon fatty acids were rare. 4. 4. High sodium concentrations were observed for most species while the concentrations of calcium, magnesium, potassium and nitrogen were typical for algae.
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