PETERS, P. W. J.; M.V.D. - Dept. of Teratol. and Pharmacol. Pathol., Natl. Inst, of Public Health, 



P.O.Box 1, BILTHOVEN, Netherlands 

 a Morphogenesis of malformations caused by retinoic acid: relation to dose and stage at treatment. 



Rattus norvegicus (Rodentia) 

 b Normal morphogenesis as standard for embryotoxicity procedures. Same species as a 

 c Induction of neural tube defects: relation between malformation and fetal protein levels in 



amniotic fluid and maternal serum 

 d Whole body micro-autoradiography in controlling placenta passage and distribution of labelled 



chemicals. Same species as a 

 PETERS, T.; Dr.med., Prof. - Zentr. fUr Anat. und Cytobiol., Justus Liebig Univ., Aulweg 123, 6300 



GIESSEN, B.R.D. (Germany) 

 a Alterations in tissue differentiation after x-ray-treatment. Triturus alpestris (Urodela) 

 b Intravital microscopy of normal and x-ray-treated gastrulae and neurulae. Same species as a 

 PETZELT, Ch. P.; Ph.D. - Inst, of Cell Res., German Cane. Res. Ctr., Im Neuenheimer Feld 280, 



Postfach 101949, 69 HEIDELBERG 1, B.R.D. (Germany) 

 a Mitosis regulation by a Ca'^-ATPase during early development. (Echinodermata) 

 b Antimitotic agents other than antitubulins (cell cultures and Echinodermata) 

 PETZOLDT, U.; Dr.rer.nat. - Fachber. Biol.-Zool., Univ. Marburg, Lahnberge, 3550 MARBURG, 



B.R.D. (Germany) 

 a Protein patterns in early development. (Mammalia) 

 b Enzyme activation during embryogenesis. (Mammalia) 

 PEXIEDER, T.; M.D., Assoc. Prof. - Inst. d'Histol. et d'Embryol., Univ. de Lausanne, 9 rue Bugnon, 



1011 LAUSANNE, Switzerland 

 a Tissue dynamics of heart morphogenesis. GaUus domesticus (Aves) 



b Embryophysiology of the circulation in the aortic arches and the heart. Same species as a 

 c Cell death in the development of the heart. Gallus domesticus (Aves), Rattus norvegicus 



(Rodentia), Homo sapiens (Primates) 

 d Teratogenic mechanisms of cardiovascular malformations. Gallus domesticus (Aves), Mus 



musculus, Rattus norvegicus (Rodentia) 

 e Endocardial development under normal and modified hemodynamic conditions (scanning 



electron microscopy). Same species as a 

 PFANNENSTIEL, H.-D.; Dr. - ZooL Inst, der Techn. Univ., Pockelstr. 10a, 3300 BRAUNSCHWEIG, 



B.R.D. (Germany) 

 a Sexual differentiation and regeneration. Ophryotrocha spec. (Polychaeta) 



b Endocrine control of gametogenesis, general aspects of oogenesis (electrophoresis, autoradio- 

 graphy, electron microscopy). Same species as a 

 PFLUGFELDER, O.; Dr.rer.nat., Prof. (Emer.) - Egilolfstr. 35, 7000 STUTTGART-Birkach, B.R.D. 



(Germany) 

 PHILLIPS, I. D. J.; Ph.D. - Dept. of Biol. Sci., Washington-Singer Labs., Univ. of Exeter, EXETER 



EX4 6DY, England 

 a Role of growth hormones in development, particularly in correlative phenomena such as apical 



dominance. Helianthus annuus (Compositae), Phaseolus multiflorus, P. vulgaris, Pisum sativum 



(Papilionaceae) 

 b Perception of gravity and the mechanisms of geotropic and epinastic responses. Helianthus 



annuus (Compositae) Zebrina pendula (Commelinaceae), Phaseolus spp. (Papilionaceae) 

 PICARD, J. J.; M.D., Ph.D., Prof. - Lab. d'Embryol., Inst, de ZooL, Univ. de Louvain, Sciences 12, 



1348 LOUVAIN-LA-NEUVE, Belgium 

 PICAUD, J. L. - Lab. de Physiol, et Genet, des Crustaces, Univ. de Poitiers, 40 av. du Recteur Pineau, 



86022 POITIERS Cedex, France 

 a Cycle sexuel et son controle. Ligia spec, Porcellio spec. (Isopoda, Crustacea) 

 PIEAU, CL; Lic.es Sci. - Serv. d'Embryol. Exper., Inst. Pasteur, 20 rue des Moulins, 951 10 SANNOIS, 



PIERIK, R. L. M.; Dr., Ir. - Dept. of Horticult., Agric. Univ., Haagsteeg 3, P.O.Box 30, 



WAGENINGEN, Netherlands 

 a Callus induction, callus culture and regulation of morphogenesis in isolated tissues. Anthurium 



andraeanum (Araceae), Freesia hybr. (Iridaceae), Gerbera jamesonii (Compositae), Nerine 



bowdenii (Amaryllidaceae), (Bromeliaceae) 

 PIETZSCH-ROHRSCHNEIDER, Ms. I.; Dr.rer.nat. - Anat. Inst, der Univ., Olshausenstr. 40-60, 2300 



KIEL, B.R.D. (Germany) 

 a Ultrastructural development of the retina. Haplochromis burtoni (Cichlidae, Teleostei) 

 b Ultrastructural morphogenesis of supraependymal structures in the fourth ventricle. Mus 



musculus (Rodentia) 

 PIHAN, J. C; Agr. de Sci., D.Sc. - Inst. Europeen d'ficoL, 57000 METZ, France 

 a Effects of heavy metals on the fecundity and embryonic development. Daphnia magna 



(Cladocera, Crustacea) 

 PUN ACKER, L. P.; Ph.D. - Vakgroep Genetica, State Univ. of Groningen, Biol. Ctr., Vleugel A, 



Kerklaan 30, HAREN 8045, Netherlands 

 a Oogenesis, spermatogenesis, spermiogenesis, fertilization, and parthenogenesis. Carausius morosus 



(Phasmida); (Acari, Arachnida) 

 b Quantitative cytochemistry, also in relation to differentiation. Same species as a 

 PILLERLG.; Dr.med., Prof. - Brain Anat. Inst., Untere ZoUgasse 71, (Waldau), 3072 



OSTERMUNDIGEN-BE, Switzerland 

 a Entwicklung des Gehirns. Gastor canadensis (Rodentia) 

 b Die Protuberantia sclerae am embryonalen Auge. Homo sapiens (Primates) 



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