growth: synthesis of bacterial protoplasm 



Acetic acid 

 Propionic acid 

 Butyric acid 



Keto-acids: 

 Pyruvic acid 

 Acetoacetic acid 

 Oxalacetic acid 

 Ketoglutaric acid 



Hydroxy-acids : 

 Lactic acid 

 Malic acid 



Alcohols 

 Glycerol 

 Hydrocarbons 

 Amino-acids 



S 



I 



CH2 



Threonine, CH3.CHOH.CHNH2.COOH 

 Methionine, CH3 . SCHg . CH2 . CHNHg . COOH 

 Valine, (CH3)2.CH.CHNHo.COOH 

 Leucine, (CH3)2 . CH . CHg . CHNHg . COOH 

 Norleucine, CH3 . CH2 . CH2 . CH2 . CHNHg . COOH 

 Isoleucine, CH3.CH2.CH(CH3) .CHNH2.COOH 



Phenylalanine, 

 Tyrosine, HO 



Tryptophan, 

 Histidine, 



CHo.CHNH,.COOH 



CH^.CHNH^.COOH 



Lysine, 

 Arginine, 



HN, 



HC==C— CH2 . CHNH2 . COOH 



I I 



Nv /NH 



H 

 H2NCH, . (CH2)3 . CHNH2 . COOH 



^C— NH.CH2.(CH2)2.CHNH2.COOH 



Glutamic acid, HOOC . CHg . CH2 . CHNH2 . COOH 

 Aspartic acid, HOOC . CHg . CHNH2 . COOH 

 H2C CH2 



I I 



Proline, 



H,C 



CH.COOH 



\n 



H 



This table is by no means comprehensive and includes only those 

 substances mentioned in this book. 



