b Studies on the nature of dehydrogenase (mainly lactate and xanthine) regulation and 



expression at different stages of development. Salmo salar, S. trutta and hybrids (SaU 



monidae, Teleostei) 

 DUKE, K. L. Ph.D., Prof. — Dept. of Anat., Duke Univ. Med. Center, DURHAM, N.C. 



27706, U.S.A. 

 a Comparative histology of the ovary (including developmental stages and history of germ 



cells). Cynocephalus volans, C. variegatus (Dermoptera), Tarsius tarsier (Primates) 

 DUMONT, J. N. Ph.D. — Biol. Div., Oak Ridge Natl. Lab., P.O. Box Y, OAK RIDGE. 



Tenn. 37830, U.S.A. 

 a Cytological studies of the oocytes with special emphasis on early developmental stages 



and vitellogenesis. Xenopus laevis (Anura) 

 h Electron microscopic studies of nucleolar changes during Wolffian lens regeneration. 



(Urodela) 

 DUNCAN, D. Ph.D., Prof. (Emer.) — Dept. of Anat., Med. Branch, Univ. of Texas, 



GALVESTON, Tex. 77550, U.S.A. 

 a Quantitative studies on the development of myelin in the central nervous system; effects 



of long tract destruction before myelination. Raftus norvegicus (Rodentia), Felis domeS' 



tica (Carnivora) 

 h Combined light and electron microscopic study of numbers and sizes of fibers and 



numbers and fine structure of the glia cells. Rattus norvegicus (Rodentia), Felis domestica 



(Carnivora) 

 DUNCAN, J. T. Ph.D., Prof. — Dept. of Cell and Molec. Biol., School of Nat. Sci., San 



Francisco State Coll., SAN FRANCISCO, Calif. 94132, U.S.A. 

 a Pigment cell migration and differentiation; developmental control of migration and pattern 



formation; developmental behavior of chromatophores and their immunological interactions 



in mixed populations of pigment cells from different species or from animals with different 



pigment pattern genotypes. Taricha torosa, Ambystoma mexicanum (Urodela) 

 h Heart determination and differentiation; temporal and spatial patterns of control of heart 



development; isolation and characterization of intracellular materials controlling heart 



development. Taricha torosa, Ambystoma tigrinum (Urodela) 

 DUNN, G. A. B.Sc. — Dept. of Zool. and Comp. Anat., Univ. Coll. London, Gower St., 



LONDON W.C.I, England 

 a Behaviour and interactions of nerve fibres from spinal ganglia grown in tissue culture. 



Gallus gallus (Aves) 

 DUPRAT (ESCUDIE), Mrs. A.-M. Dr.es Sci. — Lab. de Biol. Gener., Fac. des Sci., 118 



Route de Narbonne, 31 TOULOUSE (04), France 

 a Etude experimentale de la differenciation des cellules embryonnaires en culture in vitro. 



(Urodela) (en collaboration avec J. C. BEETSCHEN) 

 DURAN DE LOPEZ, Mrs. L. M.D. — Cat. de Embriol., Fac. de Med., Univ. de Los Andes, 



MfiRIDA, Venezuela 

 DURAND, J. P. — Lab. Souterrain du C.N.R.S., 09 MOULIS (Ariege). France 

 DURANTE, Miss M. C. D.Sc, Prof. — 1st. di Zool., Univ. di Palermo, Via Archirafi 18, 



90123 PALERMO, Italy 

 a Cholinesterase, dipeptidase and other enzymes in embryonic development. (Ascidiae; Pisces) 

 b The biochemistry of regeneration. (Annelida) 

 DURCHON, M. Prof. — Lab. de Zool., Fac. des Sci., Univ. de Lille, B.P. 36, 59 LILLE- 



Distribution, France • 



DUSPIVA, F. Dr., Prof. — Zool. Inst, der Univ., Physiol. Lehrstuhl, Berlinerstr. 15, 6900 



HEIDELBERG, W. Germany • 



a Localization of enzymes within the embryo and in subcellular fractions. (Insecta; Am- 

 phibia) 

 b Protein differentiation, ontogeny of enzyme patterns. (Insecta; Amphibia) 

 c Energy metabolism and metabolism of nucleic acids, nucleotides, cofactors during devel- 

 opment. (Teleostei; Amphibia) 

 d Cell-physiological mechanisms of malformation in early development. (Amphibia) 

 DUTRIEU. Miss J. Dr.es Sci. — Lab. de Physiol. Gener., Fac. des Sci. de Bordeaux, Avenue 



des Facultes, 33 TALENCE, France 

 a Metabolisme glucidolipidique au cours du developpement. Artemia salina (Anostraca, 



Crustacea). Calliphora erythrocephala (Diptera), Carausius morosus (Phasmidoptera) 

 DUTTON, R. W. Ph.D., Prof. — Dept. of Biol., Univ. of Cahfornia, San Diego, P.O.Box 



109. LA JOLLA, Cahf. 92037. U.S.A. 

 a Development of immune system; in vitro differentiation of immunogenic response 

 DWORKIN. M. Ph.D., Prof. — Dept. of Microbiol., Med. School, Univ. of Minnesota, 



MINNEAPOLIS, Minn. 55455. U.S.A. 

 a Developmental biology of fruiting. Myxococcus xanthus (Myxobacteria) 



1. Role and nature of a stable m-RNA required for microcyst germination 



2. Regulation of macromolecular synthesis during development 



3. Nature of proteins synthesized during germination 



4. Mechanism of induction of microcyst formation 



50 



