6 ADVENTURES IX RADIOISOIOPE ItESEARCH 



LIFE SCIENCE 



Application of Radioactive Tracers Occurring in Nature 



16 Radiochemical Method of Studying the Circulation of Bismuth in 



the Body (with J. A. Chi'istiansen and S. Lomholt) 143 



17 Radiochemical Method of Studying the Circulation of Lead in the 



Body (with J. A. Christiansen and S. Lomholt) 145 



Skeleton Studies 



18 Radioactive Indicators in the Study of Phosphorus Metabolism in 



Rats (with O. Chiewitz) 149 



19 Studies on the Metabolism of Phosphorus in Animals (with O. Chiewitz) 152 



20 Investigations on the Exchange of Phosphorus in Teeth Using Radioactive 



Phosphorus as Indicator (with J. J. Hoist and A. Krogh) 168 



21 Rate of Rejuvenation of the Skeleton (with H. Levi and O. Rebbe) 191 



22 Retention of Atom of Maternal Origin in the Adult White Rat 198 



23 Rate of Renewal of the Fish Skeleton 204 



24 Conservation of Skeletal Calcium Atoms Thiough Life 217 



25 Path of Atoms Through Generations 234 



26 Note on the Chloride Content of the Mineral Constituents of the 



Skeleton 241 



Phosphatides 



27 The Formation of Phosphatides in the Brain Tissue of Adult Animals 



(with L. Hahn) 246 



28 LecithenaemiaFollowingthe Administiation of Fat (withE. Lundsgaard) 255 



29 Formation of Phosphatides in Liver Perfusion Experiments (with 



L. Halm) 258 



30 Rate of Penetration of Phosphatides Through the Capillary Wall 



(with L. Hahn) 262 



31 Origin of Phosphorus Compounds in Hen's Eggs (with L. Halm) .... 273 



32 The Origin of the Phosphorus Compounds in the Embryo of the 



Chicken (with 11. Levi and O. Rebbe) 293 



33 Formation of Milk (with A. H. W. Aten) 304 



34 Formation of Lecithin, Cephalin and Sphingomyehn (with L. Hahn) 309 



35 Turnover of Phosphatides (with G. Ehott) 346 



