76 THE ROLE OF ALGAE AND PLANKTON IN MEDICINE 



the growth of a culture of Polytomella coeca. I. Ribonucleic acid content 

 of cells and growth rate, Biochim. et biophys. acta 5:125, 1952. 



217. Szafarz, D., and Brachet, J.: Le role du noyau dans le metabolisme de l'acide 

 ribonudeique chez "Acetabularia mediterranea," Arch, internat. physiol. 

 62:154 (Feb.) 1954. 



218. Goryunova, S. V.: Slizistye veshchestva (Mucins of Oscillatoria) Izvestiya 

 Akad. nauk SSSR, Ser. biol. no. 1, p. 29, 1950 (In Russian). 



219. Frank, B.: Uber den experimentellen Nachweis der Assimilation freien 

 Stickstoffs durch erdbewohnende Algen, Berichte Deutsche Botan. Gesellsch. 

 7:34, 1889. 



220. Drewes, K.: Uber die Assimilation des Luftstickstoffs durch Blaualgen, Zen- 

 tralbl. f. Bakt. Abt. 2, 76:88, 1928. 



221. Watanabe, A.: Production in cultural solution of some amino acids by the 

 atmospheric nitrogen-fixing blue-green algae, Arch. Biochem. 34:50, 1951. 



222. Douin, R.: Sur la fixation de l'azote libre par les myxophycees endophytes 

 des cycadacees, Compt. rend. Acad. d. sc. (Paris) 236:956 (March 2) 1953. 



223. Clarke, H. T., and Mazur, A.: The lipids of diatoms, J. Biol. Chem. 242:283, 

 1951. 



224. Klosty, M., and Bergmann, W.: Sterols of algae III. The occurrence of ergo- 

 sterol in Chlorella pyranoidosa, J. Am. Chem. Soc. 74:1601, 1952. 



225. Gillam, A. E., El Ridi, M. S., and Wimpenny, R. S.: The seasonal variation 

 in biological composition of certain plankton samples from the North Sea 

 in relation to their content of vitamin A, carotenoids, chlorophyll, and total 

 fatty matter, J. Exp. Biol. 26:71, 1939. 



226. Ahmad, B.: Observations on a diatom (Nitzschia closterium W. Sm.) as a 

 source of vitamin A, Biochem. J. 24:860, 1930. 



227. Wiedling, S.: Effect of sulphanilamides on the growth of micro-organisms 

 in presence and absence of p-aminobenzoic acid, Nature (London) 2.50:290 

 (Sept. 5) 1942. 



228. Ericson, L. E.: Uptake of radioactive cobalt and vitamin B 12 by some marine 

 algae, Chemistry and Industry, no. 34, Aug. 23, 1952, p. 829. 



229. Copping, A. M.: Origin of vitamin D in cod-liver oil: vitamin D content 

 of zooplankton, Biochem. J. 25:1516, 1934. 



230. Dam, H.: Vitamin K in unicellular photosynthesizing organisms. Am. J. 

 Botany 32:492, 1944. 



231. The culturing of algae, a symposium. Papers presented at the annual meeting 

 of the Phycological Society of America, New York City, N. Y., Dec. 26-31, 

 19-19, ed. by J. Brunei, G. W. Prescott, and L. H. Tiffany, 1950, Charles F. 

 Kettering Foundation, [Yellow Springs, Ohio] 114 p. 



232. Pruess, L., Arnow, P., Wolcott, L., Bohonos, N., Oleson, J. J., and Williams, 

 J. H.: Studies on the mass culture of various algae in carboys and deep-tank 

 fermentations, Appl. Microbiol. 2:125, 1954. 



233. Renn, C. E.: Algae research on oxidation ponds, Am. J. Pub. Health 44:631, 

 1954. 



234. Oswald, W. J., Gotaas, H. B., Ludwig, H. F., and Lynch, V.: Algae symbi- 

 osis in oxidation ponds III. Photosynthetic oxygenation, Sewage and Indus- 

 trial Wastes 2^:692 (June) 1953. 



