Dadel 



162 



D 



Dadel: see Date. 



Damar gum, IV. 277. 



Dandelion (Paardebloem), VI. 33. 



Date (Dadel, Datte, Dattel), III. 95, 



150, 185, 258; IV. 40; V. 62, 69, 106. 



167. 

 Datte: see Date. 

 Dattel: see Date. 

 Degeneration : II. 328, 329, 341-345; III. 



182; IV. 38, 46, 141, 142, 287, 338; V. 



26, 28, 32-34, 40, 56, see also : Cultiva- 



tion, Transformation, Variation. 



— prevention by colony selection, II. 

 200; IV. 38; V. 42, 66-68, 70. 



— prevention by cultivation on the right 

 oxygen tension, IV. 141, 142, 287. 



— prevention bj^ frequently transferring, 

 V. 56. 



Den, see Pine. 



Denitrification : II. 151; IV. 18, 144, 193, 



207-211, 242, 245-248, 262, 349-383; 



V. 186, 189, 283, 285, 288. 



— avoiding — in nitrification, IV. 262. 



— carbon sources, IV. 353, 354. 



— energy balance, IV. 193. 



— influence of nitrate concentration on 

 the flora of crude, IV. 356, 367. 



— influence of oxygen, IV. 262, 352, 366, 

 369. 



— influence of temperature, IV. 352-356 



— production of nitrous oxide, II. 151; 

 IV. 348, 352-354-356-370, 382. 



— theory, IV. 349, 383. 

 Denitrification, chemosynthetic: by pure 



cultures, V. 286. 



— energy balance, IV. 208, 210, 246; V. 

 282. 



— energy source, sulphur oxidation, IV. 

 207-211, 242, 245^48, 379-381; V. 

 281-288. 



— energy source, thiosulphate oxida- 

 tion, IV. 209, 379, 380; V. 282. 



— influence of humus, V. 282. 



— influence of organic substances on the 

 bacteria, V. 281, 284-288. 



— reduction of sulphur in cultures, IV. 

 208, 247; V. 283. 



Denitrifying bacteria: autotrophic, IV. 

 208, 245-248; V. 281-285. 



— autotrophic, conversion into hetero- 

 trophic forms, V. 281, 285-287. 



— heterotrophic, IV. 144, 348-354-364, 

 365-383; V. 186, 189. 



Denitrifying micrococcae, IV. 354; V. 



286. 

 Denitrifying spirillae, IV. 377, 383. 

 Descent theory, I. 10, 14, 15, 21, 26, 27, 



130, 139, 149, 154, 157, 359-366; II. 

 16, 17, 98, 288, 301, 347; III. 229; IV. 

 231, 324; V. 60, 61, 83, 86, 159, 209, 

 210, 215, 216. 



Dextran: V.53, 90,91, 235, 237, 238, 255. 



— butyric acid fermentation, V. 53, 90, 

 91, 92. 



— characteristics, V. 104-107, 238. 



— formed as wall substance only, V. 53, 

 100, 101-108, 237-239, 255. 



— formed by bacteria from cane sugar 

 only, V. 53, 100-107-108, 237-239, 255., 



— purification, V. 106, 238. 

 Dextran bacteria: V. 89, 99-108, 255. 



— description, V. 100-108, 238. 

 Dextranase (Saccharodextranase), V. 255 

 Dextrin : as a decomposition product of 



starch, III. 129-153, 299; V. 22, 196. 



— dissimilation, II. 264; III. 12, 31, 77, 



131, 133, 182, 248. 



— auxanographic demonstration, III. 

 147, 148*. 



Dextrinase (Leucodiastase), III. 128, 130, 

 136; V. 22. 



Dialysis and ultrafiltration, V. 225 ;j VI. 1 9. 



Diastase: II. 132, 171, 172, 252, 270, 278, 

 279; III. 13, 64, 68, 76, 94, 132, 134, 

 136, 137, 139, 141-153. 268, 274, 275, 

 290, 299, 343; IV. 9, 18, 29, 40, 100, 

 205, 227; V. 40, 92, 106, 187, 196, 221, 

 225, 227, 250, 257, 273; VI. 4, 7, 13, 14. 

 78, see also: Amylase and Enzymes, 

 amylolytic. 



— diffusion, III. 76; V. 221, 225, 227. 



— malt, III. 64, 94, 134, 136, 139, 145, 

 149, 196, 299, 343. 



— pancreas, II. 278, 279; III. 64, 94, 



132, 139, 268, 343. 



Diatoms: conditions for the predominan- 

 ce of — , green or blue Algae, IV. 105- 

 109, 125-128, 239, 240; V. 135. 



— enrichment culture, IV. 107, 126, 127. 



— influence of the concentration of the 

 nitrogen compounds, IV. 239; V. 135. 



— influence of the concentration of the 

 nutriënt medium. IV. 107. 126, 127, 



239, 240; V. 135. 



— pure culture, II. 308; IV. 239, 240. 



— reserve food, IV. 239-241; V. 230. 

 Dichasium, II. 9. 



Dichotomy, II. 98. 



