a Extracellular matrix fibrils as substrata for migrating neural crest cells and extending neurites in 



embryos (SEM, TEM). (Amphibia) 

 LOHMANN, K.; Dr.rer.nat. - Zool. Inst, der Univ., Weyertal 119, 5000 KOLN 41, B.R.D. (Germany) 

 a Cytochemistry and biochemistry of gene activation during gastrulation and neurulation, especial- 

 ly gene amplification and nucleic acid synthesis. Triturus vulgaris (Urodela) 

 b DNA, RNA and protein synthesis in the cell cycle of embryonic cells. Same species as a 

 LOMBARD (DES GOUTTES), Ms. M. N.; D.Sc. - Unite de Physiol. Cell., U 22 INSERM, Inst, du 



Radium, Bat. 110, 91405 ORSAY, France 

 a Steroidogenetic cells in developing ovary (cytology, light and electron microscopy, histo- 

 chemistry of delta-5-3-beta-hydroxysteroid dehydrogenase). Mus musculus (Rodentia) 

 b Factors affecting in vitro 3H-thymidine uptake by embryonic and post-embryonic hepatic cells. 



Rattus norvegicus (Rodentia) 

 c Serum and liver cytosol factors affecting cell cycle frequency of hepatocytes during postnatal 



development. Same species as b 

 d Sex-related responses to in vivo stimulation of cell proliferation in the liver. Same species as b 

 e Postnatal plasmatic hormone level variations in relation with experimental induction of a wave of 



synchronized hepatocytes entering a cell cycle (S-phase). Same species as b 

 LONNING (VADER), Ms. S.; Dr.phil. - Inst, of Biol, and Geol., Univ. of Tromso, 9001 TROMSO, 



Norway 

 LOON, L. C. van; Dr., Ir. - Dept. of Plant Physiol., Agric. Univ., Arboretumlaan 4, WAGENINGEN, 



Netherlands 

 LOONES, Ms. M. T.; Dr.Se Cycle - Lab. de Genet, du Devi., Univ. P. et M. Curie, Ctr. de Rech. d'lvry, 



67 rue M. Gunsbourg, 94200 IVRY-sur-SEINE, France 

 a Spontaneous and induced mutations detected on lampbrush chromosomes and their relationship 



with embryogenesis. Pleurodeles poireti, P. waltl (Urodela) 

 LOPASHOV, G. v.; Dr.biol., Prof. - Inst, of Developm. Biol., Acad, of Sci. of the U.S.S.R., Vavilov 



St. 26, MOSCOW 117334, U.S.S.R. 

 a Inductive interactions of the cells in differentiating retina by means of combinations of cells of 



the eye rudiment and the gastrula ectoderm. Rana temporaria, Xenopus laevis (Anura) 

 b Stimulation of metaplasia of the pure pigmented epithelium of adults into retina by means of 



agents from newly differentiated retina. (Rodentia) (with A. A. SOLOGUB) 

 c Inductive transformation of iris and pigment epitheUum into lens tissue by agents from lens 



epitheUum. Rana temporaria (Anura) (with O. A. HOPERSKAYA) 

 d Artificial transformation of nucleo-cytoplasmic fragments under the action of living retina. Same 



species as c 

 LOS, J. A.; M.D. - Anat.-Embryol. Inst., Univ. of Amsterdam, Mauritskade 61, AMSTERDAM-0., 



Netherlands 

 a Light microscopy, electron microscopy, histochemistry, physiology, and experimental terato- 



genesis of heart development in the embryo. Gallus domesticus (Aves), Mus musculus (Rodentia) 



(with H. M. LAANE and J. A. ROEST) 

 b Cell interactions in the embryonic heart. Gallus domesticus (Aves) (with J. A. ROEST) 

 LOUVET, J. P.; Dr.Biol.anim. - Lab. de Zool. Exp., Univ. de Bordeaux I, Av. des Facultes, 33405 



TALENCE, France 

 a Ultrastructure of the differentiation of ectodermal derivatives of the germ band. Carausius spec. 



(Phasmida) 

 b Segment morphogenesis and neurogenesis. Same species as a 

 c Comparative ultrastructural study of the pleuropodium. Carausius spec. (Phasmida), Locusta 



spec. (Orthoptera), Rhizotrogus spec. (Coleoptera), Pyrrhocoris spec. (Heteroptera) 

 L0VTRUP (REIN), Ms. H.; Fil.Dr. - Dept. of Zoophysiol., Univ. of Umea, 90187 UMEA, Sweden 

 a Mitochondrial differentiation during early ontogenesis. Xenopus laevis (Anura) 

 b Cell transformation and cell differentiation. Same species as a and Ambystoma mexicanum 



(Urodela) (with S. LOVTRUPand U. LANDSTROM) 

 c Metabolic processes during early development (glycolysis, pentose phosphate shunt and oxidative 



metabolism). Same species as a 

 L0VTRUP, S.; Dr.phil., Prof. - Dept. of Zoophysiol., Univ. of Umea, 90187 UMEA, Sweden 

 a Cell transformation and cell differentiation. Xenopus laevis (Anura), Ambystoma mexicanum 



(Urodela) (with H. L0VTRUP and U. LANDSTROM) 

 b Differentiation of mitochondria. Xenopus laevis (Anura) (with H. L0VTRUP) 

 LUBSEN, Ms. N. H.; Dr. - Dept. of Genet., Cathol. Univ., Toernooiveld, NIJMEGEN, Netherlands 

 a Composition and function of primary gene products from newly activated puffs. Drosophila 



hydei (Diptera) 

 LUCAS, A.; Dr.Sci., Prof. - Lab. de Zool., Univ. de Bretagne Occidental, 6 av. le Gorgeu, 29283 



BREST Cedex, France 

 a Experimental rearing of larvae; effect of pollutants and nutrition on growth and mortahty. 



Mytilus edulis, Pectinidae, Veneridae (Lamellibranchia) 

 b Morphogenesis of reproductive apparatus: gonad differentiation; juvenile sexuality. (Lamelli- 

 branchia) 

 LUCEY, E. C. A.; B.Sc. - Res. Film Unit., Inst, of Anim. Genet., Univ. of Edinburgh, West Mains Rd., 



EDINBURGH EH9 3JN, Scotland, U.K. 

 a Film of normal development. Gallus domesticus (Aves) 

 b Technique of in vitro culture of embryo; descriptive material covering first 72 hours of 



development in vitro. Same species as a 

 c Film showing nuclear transfer technique. (Amphibia) 

 d Differentiation and cell interactions in vitro of normal and abnormal ocular epithelium. Gallus 



65 



