الفهرس 
Biodiversity of Thermophilic Bacteria in Egyptian Hot Springs
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Abstract
Geothermal water samples collected from Dakhla Oasis, Kharga Oasis, Pharaoh
Baths and Ras Sedr hot springs in Egypt were explored for the isolation of industrially
efficient thermostable amylase-, protease- and lipase- producers. Of 170 enzymeproducing isolates secured from colonies developed on agar media, 12 superior ones
were subjected to morphological characteristics and biochemical profiles. Cells appeared
cocci and spiral with the majority as bacilli. Adopting the Diagnostics GN/GP 24 (Ref.
1001, 1002), the tested candidates successfully utilized various substrates as carbon and
nitrogen sources besides their abilities to produce a number of exoenzymes. Six potent
amylase-, protease- and lipase-producing thermophiles, two for either, were further
identified by 16S rRNA gene sequencing. The amylase-producers were identified as
Aneurinibacillus thermoaerophilus and Bacillus licheniformis with respective similarity
percentages of 99.48 and 100.