76 



MANUAL OF DETERMINATIVE BACTERIOLOGY 



Inst. Pasteur, 50, 1933, 414.) From soil. 

 This is the type species of genus Bnclo- 

 derma Winogradsky. 



Bactoderma rosea Winogradsky (loc. 

 cii., p. 415). Isolated from soil. 



Bacterium nitrificans Chester. (Ni- 

 tratbildner aus Northeim, Burri and 

 Stutzer, Cent. f. Bakt., II Abt., 1, 1895, 

 735; Chester, Ann. Rept. Del. Col. Agr. 

 Exp. Sta., 9, 1897, 94; Bacillus nitrificans 

 Chester Man. Determ. Bact., 1901, 239; 

 Achromobacter nitrificans Bergey et al., 

 Manual, 1st ed., 1923, 137.) From soil. 

 Description of this organism was shown 

 by Winogradsky (Cent. f. Bakt., II 

 Abt., 2, 1896, 415 and 449) to have been 

 based on impure cultures. 



Microderma yriinulissima Winogradsky. 

 From soil. This is the type species of 

 genus Microderma Winogradsky. 



Microderma vacuolata Winogradsky 

 (loc. cit.). Isolated from soil. 



Ni'.rosobacillus thermophilus Campbell. 

 See Bacillus appendix. 



Nilrobacier flavum Sack. (Cent. f. 

 Bakt., II Abt., 62, 1924, 20.) Isolated 

 from garden earth. See description. 



Manual, 5th ed., 1939, 74. Heterotrophic 

 and does not belong here (Kingma 

 Boltjes, Arch. f. Mikrobiol., 6, 1935, 83). 



Nitrobacter oligotrophtm Beijerinck. 

 (Folia Microbiol., 3, 1914, 91 ; Verzamelde 

 Geschriften van M. W. Beijerinck, 5, 

 1922, 190.) Isolated from soil. On cul- 

 tivation this species lost its autotrophic 

 habit and became heterotrophic. The 

 organism was then called Nitrobacter 

 polytrophum Beijerinck. 



Nitrobacter opaciim Sack (loc. cit. p. 

 21). Source and relationships as above. 

 See Manual, 5th ed., 1939, 75. 



Nitrobacter punctatum Sack {loc. cit., 

 p. 20). Source and relationships as 

 above. See Manual, 5th ed., 1939, 75. 



N itrobacter roseo-album. Sack {loc. cit., 

 p. 17; Serratia roseo-alba Bergey et al., 

 Manual, 3rd ed., 1930, 125.) Source and 

 relationships as above. See description, 

 Manual, 5th ed., 1939, 74. 



Nitrosomonas groningensis Sack. 

 (Cent. f. Bakt., II Abt., 64, 1925, 34.) 

 Source and relationships as above. See 

 description, Manual, 5th ed., 1939, 77. 



TRIBE II. HYDROGENOMONADEAE PRIBRAM. 



(Jour. Bact., 18, 1929, 370.) 



Short rods, non-motile or with lophotrichous flagella. Organisms capable of deriv- 

 ing energy from oxidation of hydrogen. They probably grow well on organic media 

 without hydrogen, although this has not been shown to be true for all species. 



Genus I. Hydrogenomonas Orla-Jensen.* 



(Cent. f. Bakt., II Abt., 22, 1909, 311.) 



As the only genus of the tribe, its definition is identical with the definition of the 

 tribe. From Greek hydor, water; genos, producing and monas, a unit. 

 The type species is Hydrogenomonas pantoiropha (Kaserer) Orla-Jensen. 



* This group of bacteria is characterized by the ability to grow in substrates contain- 

 ing no organic matter and to utilize elemental hydrogen as the source of energy for 

 growth. Under these conditions CO2 is used as the source of carbon. Bacteria with 

 similar physiological characteristics but differing in morphology are placed in the 

 genera Bacterium, Bacillus and Clostridium. Although other bacteria and even cer- 

 tain algae have enzyme systems which can activate hydrogen and reduce CO2 in the 

 process, there is no evidence that these organisms are able to grow in inorganic media 

 with hydrogen as the exclusive source of energy (See : Stephenson and Stickland, Bio- 

 chem. .Tour., 25, 1931, 205, 215; Woods, Biochem. .Jour., 30, 1936, 515; Lee and Umbreit, 

 Cent. f. Bakt., II Abt., 101, 1940, 354; Gaffron, Amer. Jour. Bot., 27, 1940, 273). 



