234 



The Biochemistry of Semen 



Niederland reaction, 18 



Nitrogen, total and non-protein, 

 21,32-3,84-7, 111-13 



Nitrogen mustard, effect on sperm, 

 56 



Nitrogenous bases, in semen, 

 160-82 



Noradrenaline, in semen, 181-2 



Nucleases, 123 



Nucleic acid {see also deoxyri- 

 bonucleic and ribonucleic acid), 

 in developing and mature sperm 

 cells, 5; detection and analysis, 5, 

 86-8, 99-106; species charac- 

 teristics, 101-6 



Nucleohistone, see nucleoproteins 



Nucleoprotamine, see nucleopro- 

 teins 



Nucleoproteins, 5, 8, 11, 86, 98- 

 100, 106-9 



5-Nucleotidase, 38, 121-2 



Nucleus, as part of sperm-head, 

 7-12; removal from sperm, 85; 

 constituents, 98-109 



Nutrition, effect on the com- 

 position of semen, 148-9; nutrient 

 requirements of spermatozoa, 

 xiii-xiv, 46-53, 128-9, 151-9 



Odour of semen, relation to sper- 

 mine and spermidine, 165-6 



Oestrogens, content in semen, 68; 

 effect on phosphatases, 119; 

 effect on seminal fructose, 144-5 



Opossum, clotting of semen, 28; 

 fructose, 136 



Optical properties of semen, 40-1 



Osmotic properties of semen and 

 accessory secretions, 7, 17-18, 

 23, 43; freezing point depression, 

 43; role of citric acid, 188; role of 

 inositol, 192 



Outer cylinder in the axial filament, 

 14 



Ovarian androgens, 144-5, 186 



Ovulase, 95 



Ovulation, 9 



Oxaloacetic acid, conversion to 

 citric acid, 188; as substrate, 52 



Oxygen damage, 58 



Oxygen tension, in vas deferens and 

 epididymis, 61; effect on sperm 

 motility, 73, 75, 151-2; effect on 

 metabolism, 153 



Oxytocic, hormone, 67; properties 

 of seminal plasma, 27 



Oyster sperm, glycogen, 6; respira- 

 tion, 50, 52 



Pantothenic acid in semen, 33 



Paracentrotus {see also sea-urchin), 

 sperm nucleic acid, 104; gelatin- 

 liquefying enzyme, 96 



PAS reaction, 12, 112-13 



Pasteur effect, 153-4 



Penicillin, in diluents, 81 



Pepsinogen, 116 



Peptides, life-prolonging effect on 

 sperm, 76; as products of pro- 

 teolysis, 108, 111 



Perch, 106 



Percine, 106, 108 



Periodic acid-Schiff reaction, 12, 

 112-13 



Permeability of sperm, 10; changes 

 due to senescence and damage, 

 57,77 



pH, see hydrogen ion concentration 



Pharmacological effects, of seminal 

 plasma and accessory gland 

 secretions, 26-8; of alkaloids, 56; 

 of spermine, 162; of choline, 173; 

 of adrenaline and noradrenaline, 

 182 



Phenolphthalein phosphate, as sub- 

 strate for phosphatase, 1 1 8 



2-Phenoxyethanol, spermicidal ac- 

 tion, 50 



Phenylalanine, in semen, 84, 113; 

 oxidation, 117 



p-Phenylenediamine, oxidation, 

 92 



