Four strains of alkaliphilic methanogens (strains WeN1, WeN2, WeN3, and WeN4 [T = type strain]) previously enriched and isolated from sediments of four low-salt, high-pH (pH 8.3 to 9.3) lakes in the Wadi el Natrun of Egypt were further characterized. These organisms were H-oxidizing, CO-reducing, rod-shaped bacteria which grew best at high pH values (strains WeN1, WeN2, and WeN4 preferred pH 8.4 and grew at pH values up to 9.9; strain WeN3 grew best at pH 7.8 and grew at pH values up to 9.2). Each strain required sulfide as a sulfur source and was resistant to elevated concentrations (growth rates in the presence of 0.5% NaS · 9HO were one-third to one-half the maximum observed rates). The guanine-plus-cytosine content of the deoxyribonucleic acid of strain WeN4 was 57 mol%. A new species of methanogen, , is described; strain WeN4 (= DSM 3387) is the type strain.


Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error