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Article History Three new moderately thermophilic bacteria were isolated from three (Al-Khawbah, Bani Malik, and Al- Bozah) hot springs located in Jazan district, south-western of Saudi Arabia. The isolates were identified by the sequence analysis of the 16S rRNA gene. The 16S rRNA gene sequence alignment with GenBank resulted in a percent identity (% ID) with closest GenBank match of 98% suggesting that the isolates are new strains within the branching of well-defined genus Bacillus. The phylogenetic analysis of these strains using their 16S rDNA sequence data showed that strains SA and SS30 had highest homology (98%) with B. licheniformis, whereas strain SA09 showed 98% similarity with B. subtilis. The morphological, biochemical, and physiological characteristics of the isolates were also studied. They were aerobic, gram-positive, rod-shaped, and moderately thermophilic bacteria (with an optimum growth temperature of 45-50˚C, and pH of 6).

Characterization and Identification of Moderately Thermophilic Bacteria Isolated from Jazan Hot Springs in Saudi Arabia