a Measurement of the total nucleolar material (by interference microscopy), and the 



nucleolar RNA (by scanning microdensitometry) in cultured normally differentiating 



myoblasts and in myoblasts cultured from dystrophic muscle. Gallus domesticus (Aves), 



Mus musculus (Rodentia), Homo sapiens (Primates) (with D. E. JANS) 

 ROSS, L. M. M.D., Ph.D. — Dept. of Anat., Med. Branch, Univ. of Texas, GALVESTON, 



Tex. 77550, U.S.A. 

 a Production of abnormalities of the thymus using teratogens (vitamin A, cortisone). Mus 



musculus (Rodentia) 

 b The role of the embryonic tongue in the process of closure of the secondary palate. Mus 



musculus (Rodentia) 

 ROSSI, A. Dr. — 1st. di Anat. Comp. "Battista Grassi", Univ. di Roma, Via A. Borelli 50, 



00161 ROMA, Italy 

 a Determination in the neural plate. Rana esculenta, Bufo bufo (Anuca) 

 ROSTAND, J. Prof. — 29 rue Pradier, 92 VILLE D'AVRAY, France • 



a Parthenogenese et gynogenese; regulation chromosomique par le froid. (Amphibia) 

 b Mutations (polydactylie, ectrodactylie, etc.) et anomalies provoquees par le milieu 



exterieur (principalement "Anomalie P"). (Amphibia) 

 c Action protectrice de la glycerine a l'egard de la congelation des cellules spermatiques. 



(Amphibia) 

 ROSTEDT, Miss I. B. M.Sc. — Inst, of Biol., Univ. of Jyvaskyla, Vapaudenkatu 4, 



JYVASKYLA, Finland 

 a Heterogeneous inductors on embryonic ectoderm. Gallus domesticus (Aves) 

 b Early embryonic development. Same species as a 

 ROTH, S. A. Ph.D. — Dept. of Biol., Johns Hopkins Univ., Charles and 34th Sts., 



BALTIMORE, Md. 21218, U.S.A. 

 a Molecular mechanisms for intercellular adhesive recognition and its role in morphogenesis. 



Gallus domesticus (Aves), Mus musculus (Rodentia) 

 ROTH, Th. F. Ph.D. — Dept. of Biol., Univ. of California, San Diego, P.O.Box 109, LA 



JOLLA, Calif. 92037, U.S.A. 

 a Electron microscopy, physiology, and molecular aspects of the protein transport site on 



the plasma membrane in the oocyte and liver. Culex pipiens, C fatigans (Diptera), Gallus 



domesticus (Aves), Rattus norvegicus (Rodentia) 

 b Protein, DNA and RNA inhibitors applied at various intervals of meiotic prophase are 



used to affect simultaneously the synaptonemal complex and genetic crossing over in 



synchronous oocytes; ultrastructure of meiotic prophase. Culex pipiens (Diptera) 

 c Polar granule formation; time when they associate with the germ cells, their persistence 



and their fate at oocyte maturation. Culex pipiens, Culex fatigans (Diptera) 

 d Virus transmission from mother to oocyte: cell types, sequence and time in development 



(ferritin-antivirus conjugates, electron microscopy). Gallus domesticus (Aves) 

 ROTT, Mrs. N. N. Cand.biol.sci. — Inst, of Developm. Biol., Acad, of Sci. of the U.S.S.R., 



Vavilov St. 26, MOSCOW 117133, U.S.S.R. 

 a Changes of mitotic cycle in early embryogenesis as related to morphogenetic nuclear 



function and synthesis of RNA. Strong ylocentrotus nudus (Echinoidea) , Misgurnus fos- 



silis, Salmo gaivdneri, Cyprinus carpio, Esox lucius (Teleostei), Ambystoma mexicanum 



(Ucodela) 

 ROUCH, R. — Lab. Souterrain du C.N.R.S., 09 MOULIS, France 



(no embryological work in progress) 

 ROULSTON, W. J. M.Sc. — Long Pocket Labs., C.S.I.R.O. Div. of Entomol., Meiers Rd., 



INDOOROOPILLY, Qld. 4068, Australia 

 (no embryological work in progress) 

 ROUSSEL, C. Dr.en Med. — Lab. d'Histol.-Embryol. A, Fac. de Med., 45 rue des Sts. Peres, 



PARIS Vie, France 

 a Mode d'action de certaines substances teratogenes (Triton WR 1339). (Mammalia) 

 ROUX, Ch. Dr.en Med., Prof. — Lab. d'Embryol., CHU Saint-Antoine, 27 rue Chaligny, 



75 PARIS Xlle, France 

 ROUX, J. P. Lic.de Sci.Nat. — Lab. de Zool., Inst, de Rech. Biol., Univ. Scient. et Med. de 



Grenoble, Cedex 53, 38 GRENOBLE, France 

 a Histochemistry and ultrastructure of teeth buds. Pleurodeles waltlii (Urodela) 

 ROWLEY, D. A. Prof. — Dept. of Biol., Div. of Biol. Sci., Univ. of Chicago, 1101 E. 57th 



St., CHICAGO, 111. 60637, U.S.A. 

 ROWSON. L. E. A. M.R.C.V.S. — A.R.C. Unit of Reprod. Physiol, and Biochem., Anim. 



Res. Station, 307 Huntingdon Rd., CAMBRIDGE CB3 0JQ. England 

 a Ovum transplantation and artificial insemination. (Mammalia) 



RUBEN. L. N. Ph.D., Prof. — Biol. Dept.. Reed College, PORTLAND, Ore. 97202, U.S.A. 



• 



a Neoplasia: 1. physical and chemical factors affecting immunocompetence and its relation 

 to lymphosarcoma transmissibility and development; 2. attempt to initiate non-lymphoid 

 non-viral tumours using N-nitrosomethylurea. Triturus viridescens, Xenopus laevis, Rana 

 pipiens (Amphibia) 



154 



