1 62 



NITROGEN METABOLISM 



Glutathione, transpeptidation re- 

 actions, 99 



— , triose phosphate dehydro- 

 genase, 3, 99 



Glycine, and Lb. easel, loi 



— , fermentation, 20 



— , in purine synthesis, 137 



— , oxidation, 11 



Gram stain, 132 



Growth, and nucleic acid content, 

 107 



Growth conditions, effect on 

 amino-acid decarboxy- 

 lases, 28 



, deaminase activity, 25 



, extracellular proteases, 



120 



, tryptophanase, 15 



Guanine, 126 



Haemoglobin, in legume root 

 nodules, 57 



Haemophilus influenzae, X and V 

 factors, 12 



, transforming factors, 134 



Haemophilus parainfluenzae, and 

 putrescine, 29 



, glutamic dehydrogenase, 12 



Haemophilus pertussis and gluta- 

 mic acid, 12 



Hansenula, differentiation from 

 Pichia, 43 



Hansenula anomala, nitrate reduc- 

 tion, 39 



Heterocaryosis, 68 



Histidine, a-deaminase, 21 



— , fermentation, 21 



— oxidation by Ps. fluorescens, 22 

 Homoserine, 75 



Hydrogen acceptors, i 

 Hydrogen donors, i 

 Hydrogenase, and nitrate reduc- 

 tion, 41 



— and nitrogen-fixation, 5 1 



— and Stickland Reaction, 19 

 p-Hydroxybenzoic acid, 73 

 Hydroxylamine, in denitrification, 



— , in nitrification, 37 

 — , in nitrogen-fixation, 55, 57 

 Hyponitrous acid, in denitrifica- 

 tion, 42 



Indole, from tryptophan, 15 



• — in tryptophan synthesis, 64, 71 



Indoleacrylic acid, 64 



Inhibitors, metabolite analogues, 



64 

 Intracellular proteases, 114 

 Ion transport, 89 

 Isoleucine and B. anthracis^ 65 

 — , synthesis, 76 

 Isotopes and study of amino-acid 



synthesis, 77 

 Isotopic nitrogen and pathways of 



nitrogen-fixation, 53 



a-Ketoglutaric acid, synthesis, 63 

 Kynureninase, 14 

 Kynurenine, in tryptophan de- 

 gradation, 13 

 Kynureninic acid, 13 



Lactobacillus, amino-acid decar- 

 boxylases, 27 



— , peptidases, 124 



Lactobacillus arabinosus and gluta- 

 mine, 98 



and quinolinic acid, 72 



, transaminases, 62 



, utilization of peptides, 100 



Lactobacillus bifidus, serine syn- 

 thesis, 149 



Lactobacillus casei, and aspartase, 



, folic acid requirement, 98 



, purine interconversion, 138 



, strepogenin, 102 



— — , utilization of peptides, loi 



Lactobacillus delbriickii, utiliza- 

 tion of peptides, loi 



Lactobacillus helveticus, nucleo- 

 sidases, 135 



Lactobacillus lactis and Bic, 149 



Lactobacillus pentosus, nucleosi- 

 dases, 136 



Leghaemoglobin, see Haemoglo- 

 bin 



Leucine and B. anthracis, 65 



Leuconostoc mesenteroides, and as- 

 paragine, 98 



, and glutamine, 98 



, peptidases, 124 



, serine synthesis, 148 



, utilization of peptides, 100 



Lycomarasmin, 102 



Lysine, synthesis, 75 



— , uptake by cocci, 83 



— , — by yeast, 86 



Magnesium and extracellular pro- 

 teases, 120 



