b Developmental instructions for cellular interactions and divisions considered from the point of 



view of automata and language theory. 

 c Mathematical models for the transition from vegetative to flowering condition in complex in- 

 florescences. (Compositac) 

 d Computer simulation of distribution of cell cycle phases in growing roots. (Gramineae) 

 LINDSAY, Mrs. F. E. F.; M.R.C.V.S. Anat. Dept., Vet. Sch., Univ. of Glasgow, Bearsden Rd., 



GLASGOW G6 IIQH, Scotland, U.K. 

 LINSKENS, H. F.; Dr., Prof. - Dept. of Bot., Univ. of Nijmegen, Toernooiveld, NIJMEGEN, 



Netherlands 

 a Physiological and biochemical mechanism of the fertiUzation barrier during pollen tube growth, 



pollen germination, and in the ovule. Petunia spec. (Solanaceae), Lilium spec. (Liliaceae) 

 b Induction of meiotic division. Ulva spec. (Chlorophyceae), Lihum spec. (Liliaceae) 

 c Dormancy. Agrostemma githago (Caryophyllaceae) 

 LIOSNER, L. D.; Dr.biol.sci. - Inst, of Human Morphol., Acad, of Med. Sci. of the USSR, Tsurupa 



St.3, MOSCOW 117469, U.S.S.R. 

 a Mechanisms controlling the restoration of inner organs. Rattus norvegicus, Mus musculus 



(Rodentia) 

 LIOTTI, F. S.; Dr., Prof. - 1st. di Biol. Gener., Univ. di Perugia, Via del Giochetto, 06100 PERUGIA, 



Italy 

 a Aberrazioni cromosomiche e anomalie di sviluppo. Homo sapiens (Primates) 

 LISSIA (FRAU), Mrs. A. M.; Dr. - 1st. di Zool., Univ. di Sassari, Via Murroni 25, 07100 SASSARl, 



Italy 

 a Gonadogenesis and sexual differentiation. Perca fluviatilis, Cyprinus carpio (Teleostei) 

 LITVAC, B.; M.D. - Dept. of Med. Biol., Med. School, P-^a 23 August 1, 1900 TIMI^OARA, 



Rumania 

 a Electron microscopy of embryonic cell death. Gallus domesticus (Aves) 

 LIWSKA, Miss J.; Dr.Biol. - Dept. of Histol. and Embryol., Warsaw Agric. Univ., ul.Nowoursynowska 



166, 02-766 WARSZAWA, Poland 

 a Ultrastructure of hypophysis development in the embryo. Sus scrofa domesticus (Artiodactyla) 

 LOCCI, Miss P.; Dr.biol.sci. - Inst, of Histol. and Gen. Embryol., Univ. of Perugia, Via del Giochetto, 



06100 PERUGIA, Italy 

 LOFBERG, J. E.; Fil.hc. - Zool. Inst., Univ. of Uppsala, Box 561, S-75122 UPPSALA 1, Sweden 

 LOHMANN, K.; Dr.rer.nat. - Zool. Inst, der Univ., Weyertal 1 19, 5 KOLN 41, B.R.D. (Germany) 

 a Cytochemistry and biochemistry of gene amphfication connected with differentiation processes 



in early development. Triturus vulgaris (Urodela) 

 b Generation time and changes in the cell cycle of embryonic cells. Same species as a 

 LOMBARD (DES GOUTTES), Mrs. M. N.; Dr. Sci. - Unite de Physiol. Cell., U 22 INSERM, Inst, du 



Radium, Batiment 110, 91405 ORSAY, France 

 a Induction of kidney tubules in metanephrogenetic mesenchyme. Mus musculus, Rattus 



norvegicus (Rodentia) 

 b In vitro response of fetal Leydig cells to purified follicle stimulating hormone. Same species as a 

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

 chemistry of A5-3/3-hydro\ysteroid dehydrogenase). Mus musculus (Rodentia) 

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



Rattus norvegicus (Rodentia) 

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



development. Same species as d 

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



Norway 

 a The effect of drugs and environmental factors on development and morphogenesis (experimental 



study; electron microscopy). (Echinoidea), marine spp. (Teleostei) 

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



Netherlands 

 a The quantitative relationship between hydrolytic enzyme activity and substrate mobilization, and 



the role of oxidative enzymes in resistance to virus infection in senescing leaves. Nicotiana 



tabacum (Solanaceae), Avena .sativa (Gramineae) 

 LOONES, Mrs. M. T.; Dr.3e Cycle Lab. de Genet, du Devi., Univ. P.et M.Curie, Ctr. de Rech. d'lvry, 



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

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



witli embryogenesis. Pleurodcles poircti, P. waltlii (Urodela) 

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



Vavilov St.26, MOSCOW 1 17334, 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. Mus musculus (Rodentia) (with A. A. SOLOGUB) 

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



epithelium. Rana temporaria, (Anura) 

 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 M. M. LAANl and .1. A. ROl ST) 

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



64 



