[Γιώργος Κ]

Fluorescence in situ hybridization using existing rRNA-targeted oligonucleotide probes showed that the nitrifying bacteria were from the monophyletic genus Nitrosomonas,

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autotrophic nitrification at low pH is more widespread than previously thought. The results presented in this paper clearly show that autotrophic nitrifying bacteria have the ability to nitrify at a high rate at low pH and in the presence of only a negligible free ammonia concentration, suggesting the presence of an efficient ammonium uptake system and the means to cope with low pH.
http://aem.asm.org/cgi/content/abstract/70/11/6481

Αρα τα Nitrosomonas δε σταματουν την δραστηριοτητα τους σε ph 4,3 suggesting that autotrophic nitrification at low pH is more widespread than previously thought.