a. Biochemical study of fertilization substances, with special reference to the 



physiology of polyphenol sulfate and choline derivatives. (Echinoidea) 



NURJAHAN, Miss Begum B.Sc.(Hons) — Dept of Zool., Presidency Coll., 



College St, CALCUTTA 12, India 



a. Cellular factors in morphogenesis. Gallus gallus (Aves) (in collaboration 



wit S. MOOKERJEE) 



NYHOLM. K. G. Fil.Dr — Zool. Inst., Uppsala Univ., UPPSALA, Sweden 



a. Study of the development. (Echinoderidae, Aschelminthes) 



b. Study of the life-history. (Rhizopoda monothalamia) 



OBIKA, M. M.A. — Biol. Lab., Keio Univ., YOKOHAMA, Hiyoshi, Japan 

 a. Correlation between pigment formation and pterin derivatives during 

 development. (Amphibia) 



O'BRIEN, B. R. A. B.Sc, Ph.D. — Dept of Histol. and Embryol., Univ. of 

 Syndey, SYDNEY, N.S.W.. Australia 



O'BRIEN, J. P. Ph.D. — Dept of Biol., Marquette Univ., 1217 West Wis- 

 consin Ave, MILWAUKEE 3. Wis.. U.S.A. 



a. Regression of larval and adult limb and tail following exposure to X-rays 

 or denervation. Triturus viridescens, Ambystoma punctatum (Urodela) 



b. Spindle-cell sarcoma of adult animals. Triturus viridescens, Ambystoma 

 punctatum (Urodela) 



c. Radiosensitivity in relation to temperature prevailing during exposure. 

 Rana catesbiana, Rana pipiens, Triturus viridescens (Amphibia), Mus 

 rattus, Lepus americanus (Rodentia) 



d. Irradiation of solely the circulating blood. (Vertebrata) 

 O'CONNOR. R. J. M.D., D.T.M. — Research Labs, Westminster Med. 



School, Udall St, Vincent Square, LONDON S.W. 1, England 



a. Growth and regeneration of alimentary mucosa. (Mammalia) 



b. Culture of embryonic cells: their metabolic requirements compared with 

 cancer cells. (Aves, Mammalia) 



ODOR, Miss D. L. M.S.. Ph.D. — School of Med., Univ. of Washington, 



SEATTLE 5, Wash., U.S.A. 

 O'FARRELL, A. F. B.Sc, ARCS — Dept of Zool., Univ. of New England, 



ARMIDALE, N.S.W., Australia 

 a. Regeneration and the endocrine system. Blattella germanica (Dictyop- 



tera. Insecta) (in collaboration with A. STOCK and Miss J. MORGAN) 

 OIKAWA. Miss I. B.Sc. — Fac. of Education, Kochi Univ.. KOCHI, Japan 

 OKA. H. Ph.D. (Tokyo), Prof. — Inst, of Zool.. Univ. of Education, Otsu- 



ka-Kubomachi 24, Bunkyoku, TOKYO. Japan 

 OKADA, E. — Inst, of Animal Genet., Univ. Dept of Genet., King's Build- 

 ings, West Mains Rd. EDINBURGH 9. Scotland 

 a. Electron microscope studies of gene action (in collaboration with C. H. 



WADDINGTON and Miss M. M. PERRY). 

 OKADA, K. D.Sc, Prof. — Biol. Inst., Gakugei Fac, Tokushima Univ.. 



TOKUSHIMA, Japan 

 OKADA, T. S. — Lab. of Embryol. and Exper. Morphol., Zool. Inst., Dept 



of Sci., Kyoto Univ., KYOTO, Japan 



— Inst, of Animal Genet., Univ. Dept of Genet., King's Buildings, West 



Mains Rd, EDINBURGH 9, Scotland 

 a. Differentiation of cartilage. (Amphibia), Mus musculus (Rodentia) 



(in collaboration with C. H. WADDINGTON) 



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