189 



Quercitol bacteria 



Potato, tyrosinase in, V. 280. 

 Potential environment, V. 140. 

 Poule: see Hen. 

 Prei: see Leek. 

 Premutation period, V. 54. 

 Presence-absence theory and asexual mi- 



croorganisms, V. 40. 

 Pressure and tension in culture media, in- 



fluence on bacteria, IV. 346. 

 Priestley, materia of, II. 227, 297; 



III. 293; V. 134. 

 Primel: see Primula. 

 Primula (Primel), V. 77. 

 Profermentation in yeast manufacture, 



IV. 61,63, 64, 65. 



Progenes, V. 38, 39, 47, 51, 79, 82, 83, 



214, 215. 

 Proliferation : see Cell reproduction. 

 Propyl alcohol fermentation, III. 316; 



IV. 116, 143, 150, 152, 153. 

 Prostokwacha, IV. 293. 

 Protease, II. 229, 252. 

 Protecting coUoids, V. 197, 198. 

 Protein : assimilation by microorganisms, 



III. 7, 8, 30, 61 ; IV. 29. 226; V. 273. 



— decomposition, see also: Putrefaction. 



— decomposition in the soil, IV. 255- 

 256, 260. 



— formation by microorganisms, V. 228 

 -234. 



Proteolysis by yeast, III. 258, 264, 266- 

 270, 283-285-286-289, 291; IV. 319; 



V. 227. 



Proteolytic enzymes, see : Enzymes, pro- 



teolytic. 

 Protocatechutic acid : demonstration, V. 



2. 



— production by microorganisms, V. 

 1-3, 9. 



Protonema, formation at leaves and setae 



oiMusci, I. 101. 

 Protoplasm : enzyme theory (endoenzy- 



mes), III. 169, 268; IV. 97-103, 130, 



204, 205; V. 7, 143, 206, 215, 220, 223, 



226, 251, 252. 



— liquid state of — , I. 393; IV. 130. 

 Prototheca: glycogen, IV. 233. 



— identity of the natural form and the 

 Chlorella mutant, V. 59, 60, 86*. 



— occurrence, IV. 232. 

 Pruim: see Plum. 

 Prunier: see Plum. 



Pruning, II. 9, 288, 291; IV. 310-312. 

 Pseudochlorellae, II. 310. 

 Pseudogonidia, I. 16. 



Pseudoparenchyma formed by uniceUu- 

 lar green Algae, II. 314; III. 22. 



Ptyalin, II. 278; III. 64, 94, 132, 136, 

 139, 149, 268. 



Pure cultures, anaerobic, III. 73, 74, 76, 

 77, 122, 123*; IV. 224; V. 274, 277. 



Pure lines, V. 36, 38, 62. 



Purification : auto — of enrichment cul- 

 tures, III. 84, IV. 82, 86, 88, 91-94, 

 112, 181, 354; V. 13; VI. 73. 



— auto — of soil and water, IV. 250. 



— biological, of the air. IV. 191. 



— biological, of water, IV. 250; V. 20. 



— of agar, III. 122, 189, 283; IV. 33, 34, 

 108. 109, 128, 183. 



— of gelatin, II. 331; 111.30,50. 

 Purple, I. 17. 



Purple bacteria, II. 332; III. 39-41; IV. 

 122. 



Purslane (Porselein), I. 82. 



Putrefaction: II. 180, 200, 217, 243, 269. 

 299. 340. 357; III. 13, 32, 104, 106, 

 168. 173. 239, 304. 315-318-320; IV. 

 24, 26, 29, 33-36, 63-65, 93, 198, 199, 

 201, 203. 204, 283, 284, 356, 364; V. 1, 

 274, 275. 



— indirect sulphate reduction by pro- 

 tein decomposition, III. 61, 104—106; 



IV. 24, 29, 33-36, 198, 199, 203, 204. 



— production of volatile substances, 



II. 243, 269, 270; III. 32, 318; IV. 

 33, 36; V. 274. 



Putrefactive bacteria : antagonistic action 

 of lactic acid bacteria, II. 217, 357; 



III. 13; IV. 63-65, 283, 284. 



— crude cultures of, V. 274, 275. 



— description, III. 315-318. 



— production of mercaptan, III. 318; 



V. 274. 



— production of scatol, II. 268; III. 318. 



— pure culture, V. 274-277. 



— relation to denitrifying bacteria. IV. 

 364. 



Pyocyanine. IV. 355. 



Pyoerythrine, IV. 355. 



Pyrenoid, II. 295. 311, 312, 314, 315, 316. 



318; III. 294; IV. 240. 

 Pyrites, biogenesis. III. 103. 

 Pyruvic acid. formation by bacteria from 



alanine. aspartic acid, f u marie acid and 



malie acid, V. 217-219. 



Q 

 Quercitol bacteria, enrichment culture, 

 V. 3-6. 



