INDEX 



163 



iVIanganese, activation of pepti- 

 dases, 123 



Metabolite analogues, 64 



Metals, activation of proteases, 

 120, 123 



Methionine, in purine svnthesis, 

 137-8 



— , sulphonamide antagonist, 147 



— , synthesis, 74, 149 



Micrococcus aerogenes, purine fer- 

 mentations, 136 



Micrococcus anaerobius, glycine 

 fermentation, 20 



Micrococcus denitrificans, nitrate 

 reduction, 39 



Micrococcus lactilyticus, purine 

 fermentations, 136 



Micrococcus variabilis, glycine fer- 

 mentations, 20 



Molybdenum and nitrogen-fixa- 

 tion, 50 



Mutants, methods of isolation, 

 66-7 



— , production, 66 



— , spontaneous, 66 



— , use of penicillin, 68 



Mycobacterium, pyrimidine fer- 

 mentations, 136 



— , streptomycin and diamine 

 oxidase, 155 



Mycobacterium tuberculosis, pepti- 

 dases, 124 



Neiirospora, adenosine deaminase, 

 136 



— , arginine synthesis, 69 



— , nitratase, 40 



— , reproductive cycles, 66 



— , transaminases, 61 



— , use of mutants, 66 



Neiirospora crassa, D-amino-acid 

 ^ oxidase, 11 



r , L-amino-acid oxidase, 1 1 



, L-glutamic acid dehydro- 

 genase, 12 



, nitrate reduction, 39 



Nicotinic acid, relation with trj'p- 

 tophan, 72 



Nitramide, in denitrification, 41 



Nitratase, 40 



Nitrate and nitrogen-fixation, 54 



• — from nitrite, 32 



■ — reduction, 39 



Nitric oxide in denitrification, 42 



Nitrification, effect of organic 

 compounds, 34 



Nitrification, effect of Chloro- 

 mycetin, 38 



— , — of potassium chlorate, 38 



— , energy relationships, 39 



— , hydroxylamine in, 37 



— , in soil, 36 



— , isolation of organisms, 33 



— , soil percolation apparatus, 35 



Nitrite, oxidation to nitrate, 32 



Nitrobacter zvinogradsky , 33 



Nitrogen cycle, 6 



Nitrogen-fixation by blue-green 

 algae, 50, 56 



by Clostridium, 49 



by Desulphovibrio, 50 



by leguminous plants, 45 



by photosynthetic organ- 

 isms, 50 



detection of, 47 



effect of pCO, 52 



of pHa, 51 



of pNa, 51 



of trace elements, 50-1 



isolation of organisms, 46 



pathways, 56 



Nitrogen sources, 4 



Nitrosomonas europoea, 33 



Nitrous oxide, in denitrification, 

 42 



Nitroxyl, 42 



Nocardia, pyrimidine fermenta- 

 tion, 136 



Nodules, nitrogen-fixation by, 50 



Nostoc and nitrogen-fixation, 50 



Nucleic acids, chromatinic bodies, 

 133 



, components, estimation of, 



129 



, composition, 127 



, Gram stain, 132 



, hydrolysis of, chemical, 130 



, enzymic, 134 



, microbial, 131 



, protein synthesis, 107 



, structure, 127 



, transforming factors, 134 



Nuclecproteins, 127 



Nucleosidases, 135 



— , in nucleotide synthesis, 140 



Nucleosides, structure, 126 



Nucleotides, structure, 126-8 



Nutrition, 3 



Ophiostoma, mutants, 66, 75, 137 

 Orotic acid, 139 

 Oxido-reduction reactions, i 



