TII11 FORMATION OF P ROT KIDS IN TLANT-CFLLS. 



51 



groups CH 3 , CH 2 , CHOH, CH?OH can be used as sources of 

 carbon, if they neither act poisonously nor offer too much 

 resistance to the attacks of bacteria. If the atomic group 

 CH : CH is utilised, as in the case of fumaric acid, we might 

 easily explain this by the conversion into CII 4 .CH 2 OH, a 

 molecule of water being taken up. In the following table 

 are enumerated a number of compounds that form very good 

 sources(I), moderatly good sources(II), very poor sources (III) 

 and such, as far as observations reach, cannot be utilised as 

 sources of carbon(IV). 



I 



11 



III 



IV 



Glycerin 



Methyl alcohol 



Phenol 



Pinacon 



Mannite 



Aethylenglycol 



Acetoxim 



Sulfonal 



Sugars 



Aceton 



Di aceton am in 



Amidoacetal 



Lactic acid 



Acetic acid 



Valerianic acid 



Oxalic acid 



Succinic „ 



Fumaric ,, 



Maleic „ 



Meconic „ 



Tartaric ,, 



Pyruvic „ 



Citraconic ,, 



Picric „ 



Citric ,, 



Laevulinic „ 



Benzoic ,, 



Antipyrin 



Betain 



Glycocoll 



Lecithin 



Di methyl -oxypy- 









rimidin 



Alanin 



Methylamin 



Trimethylamin 



Aethylendiamin 



Leucin 



Cholin 



Strychnin 



Pyridin 



Asparagin 



Allantoin 



Hexamethylen- 



Urea 







amin 





Glutamin 



Coffein 



Amidobenzoic 



Parabanic acid 







acid 





Kreatini) 



Methyl cyanide 



Glyoxylic acid 



Guanidin 



A most remarkable phenomenon in regard to bacterial deve- 

 lopment (therefore also to the formation of protein) was first 

 observed by F. Hiippe, 2) and later confirmed by Munro and by 

 Winogratlzky, that the nitrifying bacteria of the soil may develop 

 in solutions destitute of organic matter, and may utilise ammo- 

 nium carbonate. Hilppe assumed here a decomposition of water, 



1) Th. Bokomy and myself have made a series of experiments to nourish also 

 algae with organic matters, and observed a much more favorable result with kreatin 

 and hydantoin than with leucin or urethan. Recently Th. Bokomy extended these 

 investigations to a larger number of combinations, showing that algae may well 

 utilise organic matters, although they do not require them for supporting their life. 

 (Chemikerzeitg. Jan. 1894). 



2) Hi'ippc, Biol. Centralbl.7, 702. 



