METABOLIC AND OTHER CHANGES AT FERTILIZATION 87 



(13. i) No change in free 'cholesterol' for 15 min. after f. ; then 

 gradual decrease. P. lividiis (Lindvall & Carsjo, 1948). 



(13.2) Increase in free 'cholesterol' at f, A. lixiila (Monroy & 

 Ruffo, 1945*). 



(13.3) Fall in free cephalin at f. E. cordatum (Ohman, 1945). 



(13.4) Decrease in lipids after f. A. punctiilata (Hayes, 1938). 



(13.5) No change in lipids or lipo-proteins after f. A. punctulata 

 (Parpart, 1941*). 



(13.6) Increase in lipids after f. ^. e^'Morwrn (Panijel, 1951). 



(14) Decrease in carbohydrate after f. P. lividus (Zielinski, 1939) ; 

 P.Uvidus, E. cordatum (Orstrom & Lindberg, 1940); sea-urchin 

 (Lindberg, 1945); A. eqtiorum (Panijel 195 1); R. temporaria (Panijel, 

 1 951); P. miliaris (Lindberg, 1943). 



(14. i) No decrease in carbohydrate after f. A. punctulata 

 (Hutchens et al., 1942). 



This work has been criticised by Lindberg (1945). 



(15) No change in dipeptidase activity after f. P. miliaris, 

 (Doyle, 1938); E.parma (Holter, 1936). 



(15. 1 ) Slight decrease in dipeptidase activity after f. U. caupo 

 (Linderstr0m-Lang & Holter, 1933). 



(15.2) Fall in amino-nitrogen, principally glycine, during first 

 two hours after f. and accumulation of free glutamine immediately 

 after f. P. lividus (Gustafson & Hjelte, 195 1). 



(^5"3) No change in free amino acids after f. S. purpuratus 

 (Berg, 19506). 



(15-4) Amino acid metabolism and, in particular, Kavanau's 

 recent results, are discussed in chapter 6. 



(15.5) Transient activation of proteolytic enzymes. P. lividus, 

 A. lixula, E. cordatum, E. esculent us, B. lyrifera (Lundblad, 1949- 

 1954)- 



G 



