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136 INDEX Paranuclein, synthesis of, 52. Partition between phases, 90. Pectase, 100. Pepsin, 13, 16, 24, 29, 30, 33, 37, 39, 41, 52, 98, 120. Pepsinogen, 108. Peptone " Roche," 40. Peptones, electrical conductivity of, 39. — production in enzyme actions, 13, 40. Permanency of colloidal solutions, 26. Permolybdic acids formed as intermediate compounds, 7. Peroxidase, 38, log, iii. Peroxides, 109. Phaseo-lunatase, 120. Phosphates as activators of yeast-juice, loi. Phosphorus, separation from caseinogen by trypsin and by alkali, 14. — absent from pepsin, 30. Photochemical action, 13, 112, 113. Physical consistency, changes in, not best method, 38. Plastein, 52. Platinum, catalysis by, i, 3, 5, 7. Polarimeter, as method, 37. Polypeptides, action of trypsin, etc., 13,40, 53, 62, 119. — as substrate, 37, 40. Positive auto-catalysis, 72, 73. Precipitation of enzymes, 30, 36. Preparation of enzymes, 33. Products, retardation of reaction by, 61. Proportionality of final result to concentra- tion of enzyme, 15. Protamine, synthesis of, 52. Protection of enzyme by substrate or pro- ducts, 60, 65. Protein reactions of certain enzyme prepara- tions, 29. Proteoses, production by enzymes, 40. Prothrombin, 73. Protoplasmic activity and antiseptics, 32, 85. Ptyalin, 33, 85. Purification of enzymes, 35. " Radio-activity " of enzymes, 31. Raffinose, 115. Refiractive index as method, 38. Rennet, 17, 22, 99, 120. Resistance of mucous membrane to en- zymes, 105. Result of enzyme action independent of amount of catalyst, 14. Retardation by products of reaction, 53, 61, 66. — causes of, 53, 61. Reversible reactions, 6, 42, 66. catalysed by enzymes, 18. effect of catalysts on, 6. Reversibility in relation to action of pro- ducts, 53, 65. — of amylase, 42, 44. — of emulsin, 18. — of invertase, 18, 43. — of lipase, 18, 44, 45. — of maltase, 18, 47. Revertose, 47. Salicin, synthesis of, 18, 67. Secretin, 106. Shaking, effect on enzymes, 22. Side-chain theory, 99. Silent discharge, action on carbon dioxide, "3- Sinigrin, 40. Slow combination of oxygen and hydrogen, 3. Solid solution, 88. Solidification of acetic acid, rate of, 3. Solubilities of enzymes, 30, 97. Specificity of adsorption, 88, 95, 96, 108. — of enzymes, 61, 66, 95, 118. Spectro-photometer as method, 38. Square-root law of Schiitz, 82, 84, 89. Stability of enzymes, 16, 22, 29, 31, 51, 60, 80. Stages of reactions, 40, 68. Starch, action of acids on, 13. diastase on, 13, 64, 115. — formation, 42. Stereo-chemistry of glucosides, 46, 93. Sterilization of trypsin, etc., 86. Stopping action of enzymes, methods of, 41. Substrate defined, 11. Supersaturated solutions, 3. Surface coagulation, 22. — condensation, 7, 21, 43, 88. — effect on equilibrium, gi. — in colloids, 20. — tension, 21, 88, 89, 94, 102. Synthesis by amino-acids, 53. amylase, 44. — — ■ invertase, 43. — lipase, 18, 44, 45, 102. — — optically active catalysts, iig. — importance of small amount, 44. — of dextrin, 49. — of ethyl butyrate, 18. — of higher fats, 45. — of optically active bodies, 49. — of saccharose, 43, 67. — of salicin, 18, 67. — of starch, 42, 44. — part played by water in, 43. Synthetic action of proteoclastic enzymes, 52^ 118. — enzymes, 49, 118. Temperature coefficient of chemical re- action, 93. — ■ — of diffusion, 74, 93. of physical processes, 74, 93. Temperature, effect on ionisation of water, 12. — effect on velocity of enzyme action, 41 , 76, 93- — of destruction of enzymes, 31, 120. — optimum, 18, 77. — Van't Hoffs rule of, 3, 76. Terminology of enzymes, 11. Thrombase, 113. Thrombogen, 113. Thrombokinase, 113. Time factor in destruction of enzymes, etc.„ 77- Tissue juice, preparation of, 34. Toluene as antiseptic, 32, 85. Toxoids, 99. INDEX 137 Trigger action, 2, 3, 4, 14. Trypsin, 12, 14, 16, 17, 22, 24, 29, 33, 36, 37, 38, 39, 40, 41, SI, 52, 59, 60, 64, 71, 76, 80, 81, 83, 84, 86, 89, 92, 105, 115, 118. — detection of, 40. — effect of alkali on rate of action, 71. — negative auto-catalysis, 71. — not activator of hydroxidion, 14, — sterilization of, 86. — velocity of reaction, 15, 59, 83. Trypsinogen, 17, 33, 107. Tyrosinase, iii. Tyrosine, 40, iii. Ultra-microscope, 20. — in enzyme action, 22, 97. Unimolecular reaction, formula for, 57. Uranyl phosphate method of precipitation, 36, 108. Urea, hydrolysis of, 39, 115. Urease, 39, 115. Uricolytic enzyme, 35. Valency in action of electrolytes on colloids, 27. Variety of products by enzymes, 13. Velocities, Newton's law of, 57. Velocity-constant of reactions, 58. — of reaction, 55. Viscosity, as method, 38. — of proteins, 38, 82. Water in synthetic processes, 43. Yeast, emulsin in, 48. — preparation of enzymes from, 34. — press-juice, action on glycyl-tyrosine, 65. co-enzyme of, loi. Zymase, 16, 33, 34, 36, 46, 86, loi, 114, 118. — co-enzyme of, loi. — preparation of, 33. Zymogens, 17, 33, 107. Zymolyte, 11. Zymoids, 99. ABERDEEN : THE UNIVERSITY PRESS. 