Rollhauser 76 Roth 



b. Polarisationsoptische und rontgenographische Analysen verschieden alten 

 Sehnengewebes. Mensch (Sauger) 

 ROOFE, P. G. Ph.D.. Prof. — Dept of Anat, Univ. of Kansas, Med. School, 

 LAWRENCE, Kan., U.S.A. 

 a. Development of the central and peripheral nervous system in relation 

 to behavior patterns along Coghillian lines of investigation. Ambhj stoma 

 maculatum and tigrinum (Amphibia) (in collaboration with G. M. LEE) 

 ROSE, S. M. Ph.D., Assoc. Prof. — Dept of Zool., Univ. of Illinois, 

 URBANA, 111., U.S.A. 



a. Dedifferentiation of normal and neoplastic tissues during limb regene- 

 ration in Amphibia. 



b. Demonstration that tumor agents can acquire new tissue and regional 

 specificity. (Amphibia) 



c. Regeneration of X-rayed amphibian limbs receiving unirradiated 

 epidermis. 



ROSENBAUM, R. M. B.S. — Biol. Lab., Harvard Univ., CAMBRIDGE 

 38, Mass., U.S.A. 



a. Cytochemistry of the egg. Rana pipiens (Anura), Triturus viridescens 

 (Salamandridae) 



b. Chromosome phenomena in the early egg. Rana pipiens (Anura) 

 ROSIN, S. Dr, P.D. — Zool. Inst, der Univ. Bern, Sahlistr. 8, BERN, 



Schweiz. 

 a. Analyse genetischer und experimenteller Borstendefekte bei Drosophila. 

 (Insecta) 

 ROSSETTI, F. Dr — Dept of Zool., Univ. of Chicago, CHICAGO 37, 

 111., U.S.A. 

 a. Factors determining size of Mauthner's cell. (Amphibia) (in collabora- 

 tion with P. A. WEISS) 

 ROSTAND, J. — 29, Rue Pradier, VILLE d'AVRAY, (Seine et Oise), 

 France. 



a. Parthenogenese et gynogenese des Batraciens. Regulation chromosomique 

 par le froid. 



b. Mutations de Batraciens (Polydactylie, Ectrodactylie, etc.): comporte- 

 ment hereditaire et physiologie genetique. 



c. Modifications des noyaux au cours de l'ontogenese. (Batraciens) 



d. Survie de l'ovule in vitro, a basse temperature. (Batraciens) 

 ROTHFELS, U. Ph.D. — Univ. of Colorado, Med. Center, Dept of 



Pediatrics, 4200 east Ninth Ave, DENVER 7, Col., U.S.A. 



a. Study of differentiation of chick somites in explants (Spratt technique). 

 (Aves) (in collaboration with H. HERRMANN, L. LUBCHENCO 

 and J. McKENZIE) 



b. Study of developmental disturbances related to nutritional deficiencies 

 investigated by application of anti-vitamins and anti-amino acids to the 

 intact egg and to explants (somites). In particular, it will be attempted 

 to define the factors which maintain the balance between myotome, 

 sclerotome and dermatome during differentiation of the somite and are 

 required for the normal development of the retina (possible connection 

 with retrolental fibroplasia of the premature human infant). (Aves) 

 (in collaboration with H. HERRMANN, L. LUBCHENCO and 

 J. McKENZIE) 



