Biochemistry and Physiology of Protozoa by André Lwoff

By André Lwoff

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03 g. of free astaxanthin, the parent substance of astacene. The similarity to the lobster pigment was close: astaxanthin in the aplanospores was present in the form of fatty acid esters. Astaxanthin is assigned the following structure (reviewed by Goodwin and Srisukh, 1949) : Me H0 /~VvV^ — 7 ^ Me Me Me Me Me 0 Strictly speaking, the compound is a double a-ketole; spontaneous oxidation of the ketole groups to double ketonic groups gives astacene. Following the current convention for numbering carotene carbons, astaxanthin is 3,3'-dihydroxy, 4,4'-ß-carotene.

This entails deep-reaching adaptations: flexibility of the cell wall to permit the surrounding of particles, and secretion of digestive enzymes. Prédation may be furthered by the elaboration of food-gathering and locomotory devices. The pseudopodial and rhizopodial habits represent two solutions to the problem of the ingestion of solids; other types of animal develop special sites for ingestion and digestion. And, as noted in later discussion, phagotrophy allows an increased molecular complexity of food.

B. (1941). J. Bact. 42, 437. Tavlitzki, J . (1949). Ann. inst. Pasteur 76, 497. Treboux, O. (1903). Flora 92, 49. von Brand, T. (1935). Ergeh. Biol. 12, 161. Van Niel, C. B. (1949). In Photosynthesis in P l a n t s , j ) p . 437-495. J . Franck and W. E. , The Iowa State College Press, Ames, Iowa. Winogradsky, S. (1888). Beiträge zur Morphologie und Physiologie der Bakterien. I. Zur Morphologie und Physiologie der Schwefelbakterien. Arthur Felix, Leipzig. The Phytoflagellates S. H. HUTNEB AND LUIGI PKOVASOLI Baskins Laboratories, New York It is better to ask some of the questions than to know all the answers.

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