Presence of thermo-alkalophilic Bacillus species in certain soils at al-Madina al-Munawwarah, Saudi Arabia

الملخص EN

Trials were made to detect the presence of thermo-alkalophilic bacteria in certain soils at AI-Madina AI-Munawwarah district.

Soil samples were obtained from two different localities for such a purpose, and they were chemically analysed.

The obtained data revealed that, the collected soil samples (arid soils of, 0.37-0.630/0; organic matter, 0.05-0.11 %; organic nitrogen, 0.19-0.28%; water soluble salts 3.02-5.73%; moisture content, and of pH values ranges from 8.2- 9.0) were inhabited by thermo-alkalophilic bacteria, prefer to grow at high temperature (55°C) in media adjusted at pH 10.

The bacterial isolates were identified down to their species level, and they were given the names Bacillus alvei, B.

brevis, B.

megaterium, B.

circulans and B.

pumilus.