SUBJECT INDEX 



1185 



Nernst potential, 786 



Nervous system, resistance to bacterial invasion, 



587 

 Neuberg equations, 237, 501 



Neuralgia, 582 



Neuritis, 582 



Ninhydrin test (in Abderhalden's reaction), 1059 



Nitrates 



reduction, 211, 355 



used by soil bacteria, 317, 318 

 Nitrification, 225, 357 

 Nitrifying bacteria, 281, 355 

 Nitrites, 318 



oxidation, 323 



reduction, 211 

 Nitrohacter, 132, 225, 281, 318, 323 

 Nitrogen 



amino acids as source of, 224 



atmospheric, utilization of, 225 



content of bacteria, 218, 219 

 changes in, 316 



compounds, utilization of, 243 



fixation by bacteria, 282, 283, 319, 337, 340 



gaseous, 211, 283 



necessary for growth, 244, 280 



inoculation in soy beans, 336 



Metabolism of Bacteria, 218-26 



non-nitrogenous matter 

 in bacterial cells, 218 

 compounds, utilization, 246 



nutrition in nodules, 335 



oxidation of, 324 



purine bases as source of, 224 



in soil, transformation of, 316, 318 

 Nitrosococcus, 225, 323 

 Nitrosomonas, 225, 318, 323 

 Nocardia, 130 

 Nucleases, 274 

 Nuclei, 6, 7, 39 



changes, 88 



material, 221 

 Nucleoprotein, bacterial, 23, 729, 731 



as antigens, 723, 970 



dispersion of, 25 



of pneumococcus, 702 

 Nutrition of bacteria, 14 



of soil bacteria, 314 



nitrogen, in root nodules, 335 



O colony forms, 95. See also Rough colony forms 

 Obligate 



anaerobes, 199, 201, 205 



autotrophs, 323 

 Ocean, bacteria in, 58 

 Oidiiim lactis, 70, 400 

 Oil, effect of, on heat resistance, 295 

 Oligocarbophilous bacteria, 281 

 Opium, filterability of, 562 

 Opsonins, 810, 871 



endothelial, 809 



index, 878 



Optimum 



medium, 283 



reaction for enzymes, 272 

 Optochin, 1 109, 1 1 22 

 Organelles, 97 

 Organic matter 



influence on autotrophic bacteria, 330 



dry substance of bacteria, 15 



decomposition of, 315, 316 



in sewage, 352 



and soil fertility, 342 

 Organotropism, iioi 

 Oroya fever, 518 

 Osmosis, 77 



Osmotic pressure, Van't Hoff's law, 739 

 Otitis of rats, 636 

 Ovo-vitellin, 713 

 Ovomucoid 713 

 Oxalic acid, 246, 512 

 Oxidase 276 



in spore material, 9 

 Oxidation, bacterial, 215, 217 



of ammonia, 323 



of glucose, 322 



Hoppe-Seyler's theory of, 201 



of hydrogen, 324, 329 



effect of light on, 372 



of nitrite, 323 



and pH, 194 



reversible of hemolysins, 214 



in sewage, 357 



of sulphur, 282, 325 

 Oxidation reactions of sterile plant tissue, 208 

 Oxidation-reduction 



Bacterial, 211-17 



by enzymes, 276 



potentials of dye systems, 188 

 and anaerobiosis, 196 

 indicators, 193 

 and pH, 192 

 theory, 189 

 Oxidizing ferments in bacteria, 215 

 Oxido-reductases, 276 

 Oxygen 



demand, 354 



free, 202 



necessary for growth, 280 



intolerance, modified, 209 



leeches living without, 200 



pressure, 196 



in sewage, 353, 354 



indispensable for sulphur bacteria, 327 



and surface tension, 182 



tension, 117, 202, 259, 261 



tolerance, 202 



effect of ultra-violet light, 376 



Pancreatitis, 582 

 Papillae, 96 

 Pappataci fever, 518 

 Paralysis, post-diphtheritic, 778 



