a Mechanism of testicular descent (histology, biochemistry, tissue culture). (Mammalia) 

 b Development of heart anomalies, especially hypoplasia of right and left heart. (Mammalia) 

 WENT, D. F.; Dr.sc.nat. - Dept. of Zool., Swiss Fed. Inst, of Technol., Universitatstr. 2, 8006 



ZURICH, Switzerland 

 a Physiology of paedogenetic reproduction; sex determination; in vitro culture of ovaries; time- 

 lapse cinematography. Heteropeza pygmaea (Diptera) 

 b Morphogenesis and regulation in the meroistic ovary: establishment of egg architecture and its 



relation to embryonic development (autoradiography, electron microscopy, culture in vitro, 



time-lapse cinematography). Same species as a 

 WESSELS, J. G. H.; Dr., Prof. - Dept. of Developm. Plant Biol., State Univ. of Groningen, Biol. Ctr., 



Kerklaan 30, HAREN (Gr.), Netherlands 

 a Biochemistry and ultrastructure of sexual morphogenesis, especially in relation to enzyme 



regulation. Schizophyllum commune (Basidiomycetes, Fungi) 

 b Biochemistry and ultrastructure of hyphae, synthesis and degradation of wall constituents. Same 



species as a 

 WESTIN, Ms. M.; Ph.D. - Dept. of Immunol., Wenner-Gren Inst, for Exp. Biol., Fack, 104 05 



STOCKHOLM 50, Sweden 

 a Immunological study of individual embryonic proteins, their gene dependence, function, localiza- 

 tion, and appearance in different developmental stages. Paracentrotus lividus (Echinoidea) 

 WEYCHERT, K.; Mgr.biol. - Dept. of Zool., Inst, of Biol., Univ. of N. Copernicus, Gagarina 9, 87-100 



TORUINJ, Poland 

 a Regeneration of appendages in normal and experimentally changed conditions. Tegenaria atrica 



(Araneae, Arachnida) 

 WEYGOLDT, P.; Dr., Prof. - Biol. Inst. I (Zool.) der Univ., Albertstr. 21a, 78 FREIBURG, B.R.D. 



(Germany) 



no work on developmental biology in progress 

 WHITE, Ms. J.; M.A. - Dept. of Developm. Biol., Marischal Coll., Univ. of Aberdeen, ABERDEEN 



AB9 IAS, Scotland, U.K. 

 WHITEAR, Ms. M.; Ph.D., D.Sc. - Dept. of Zool., Univ. CoU. London, Gower St., LONDON WCIE 



6BT, England 

 a Morphological and experimental study on origin and development of Merkel cells and chemosen- 



sory cells in larval epidermis. Many spp. (Anura & Urodela) (with H. FOX) 

 WHITTINGHAM, D. G.; Ph.D. - MRC Mammal. Devi. Unit, Univ. Coll. London, Wolfson House, 4 



Stephenson Way, LONDON NWl 2HE, England 

 a Factors involved in oocyte activation, e.g. role of Ca-ions; changes in electrical properties of the 



vitelline membrane; developmental potential of activated oocytes. Mus musculus (Rodentia) 

 b Effect of long-term storage at low temperatures and of background radiation on survival of 



preimplantation embryos; feasibility of storing unique mutant stocks at -196C. Mus musculus, 



Mesocricetus auratus, Rattus spec. (Rodentia), Oryctolagus cuniculus (Lagomorpha) 

 WIDE, Ms. M.; Fil.mag. - Inst, of Zool., Uppsala Univ., Box 561, 751 22 UPPSALA, Sweden 

 a Disturbances of blastocyst implantation by lead chloride in vivo and in vitro. Mus musculus 



(Rodentia) 

 WIGGLESWORTH, Sir V. B.; Dr., Prof. (Emer.) - Dept. of Zool., Univ. of Cambridge, Downing St., 



CAMBRIDGE CB2 3EJ, England 



no embryological work in progress 

 WIJK, R. van; Dr. - Dept. of Molec. CeU Biol., State Univ. of Utrecht, Padualaan 8, UTRECHT, 



Netherlands 

 a Factors affecting growth rate and length of cell cycle phases of normal hepatocytes and cultured 



hepatoma cells; role of cyclic nucleotides, enzymes and hormones (time lapse microcinemato- 



graphy, DNA photometry, autoradiography). Rattus spec. (Rodentia) 

 b Control of tyrosme aminotransferase synthesis in relation to differentiation of hepatocytes. Same 



species as a 

 WILCOX, M.; Ph.D. - Lab. of Molec. BioL, Med. Res. Council, Hills Rd., CAMBRIDGE CB2 2QH, 



England 

 a Imaginal disc development, especially formation of compartments and their maintenance during 



regeneration. Drosophila melanogaster (Diptera) 

 b Mechanisms underlying heterocyst spacing. Anabaena spec. (Cyanophyceae) 

 WILD, A. E.; Ph.D. - Dept. of Biol., Univ. of Southampton, SOUTHAMPTON S09 5NH, England 

 a Protein transmission across foetal membranes. Oryctolagus cuniculus (Lagomorpha) 

 WILDE, A. G. de; M.D., Ph.D., Prof. - Dept. of Anat. and EmbryoL, State Univ. of Groningen, 



Oostersingel 69, GRONINGEN, Netherlands 

 a Development of computer programs for the reconstruction, by incremental plotter, of embryonic 



organ structure, 

 b Morphogenesis of the palatal and nose regions, studied by means of reconstructions. Mus 



musculus, Rattus norvegicus (Rodentia), Homo sapiens (Primates) 

 WILLEMSE, M. Th. M.; Ph.D., Prof. - Dept. of Bot., Agric. Univ., Arboretumlaan 4, WAGENINGEN, 



Netherlands 

 a Ultrastructural, histochemical, and comparative study of micro- and macrogametogenesis and 



fertilization. Vaucheria geminata (Xanthophyceae), Equisetum variegatum (Equisetophyta), 



Thuja occidentahs (Cupressaceae), Pinus sylvestris (Pinaceae) 

 b Ultrastructural and experunental study of the division and formation of mitochondria in the 



central and egg cell of the archegonium. Pinus sylvestris (Pinaceae) 

 WILLETTS, A.; Ph.D. - Dept. of Biol. Sci., Univ. of Exeter, Perry Rd., EXETER EX4 4QG, England 

 a Biochemical and cytological changes associated with the transition yeast-mycelial form, especially 



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