NITROBAGTER 505 



Definition. — Hydrogenomonas. 



Monotrichate short rods, capable of growing in the absence of organic matter, 

 and securing growth energy by the oxidation of hydrogen (forming water). Kaserer 

 (1906), who first described the organism, states that his species will also grow well 

 on a variety of organic substances. 



Type species is Hydrogenomonas paniotropha. Niklewski (1908) described two 

 additional species, Hyd. vitrea and Hyd. flava. 

 Definition. — Methanomonas. 



Monotrichate short rods, capable of growing in the absence of organic matter, 

 and securing growth energy by the oxidation of methane (forming carbon dioxide 

 and water). 



Type species is Methanomonas methanica (Sohngen 1906). 

 Definition. — Carhoxydomonas. 



Rod-shaped cells capable of securing growth energy by the oxidation of car- 

 bon monoxide (forming carbon dioxide). 



The type species, Carboxydom.onas oligocarbophila (Beijerinck and van Delden 

 1903), is described as non-motile. 

 Definition. — Acetobacter. 



Cells rod-shaped, frequently in chains, non-motile. Cells grow usually on the 

 surface of alcoholic solutions as obligate aerobes, securing growth energy by the 

 oxidation of alcohol to acetic acid. Also capable of utilizing certain other car- 

 bonaceous compounds, as sugar and acetic acid. Elongated, filamentous, club- 

 shaped, swollen, and even branched cells may occur as involution forms. 



Type species is Acetobacter aceti (Thomson 1852). 



REFERENCES 



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Omeliansky, W. L. and Ssewerowa, 0. P. (1911) Zbl. Bakt., lite Abt., 29, 643. 

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