Organizations Help Wadi el-Natrun is a basin in the Western Desert of Egypt west

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Organizations Help Wadi el-Natrun is a basin in the Western Desert of Egypt west of the Nile's Delta and about 100 km northwest of Cairo. This below-sea-level valley is dotted with many lakes fed by the Nile's water table that give the valley its name. It comes from the Latin name of sodium (natrium) because those lakes are highly alkaline and rich with sodium carbonat or Natron. This alkaline salt combination was essential for mummification. The valley was later known for the role it played in early Christianity and more recently as the place where Antoine de Saint Exupéry crushed-landed his airplane and gave the inspiration of - not again!- the "Little Prince" Enough chit-chat. Those alkaline lakes (pH of about 10.5) are home to few well-adapted organisms that can survive the harsh conditions. One of them is the very aptly named archaeonNatronomonas pharoonis.Remarkably, the cytoplasm of this microbe is quite "normal" with the internal pH maintained at -7.5 This means that N, pharoonis maintains a hydrogen ion gradient across its membrane. In fact the hydrogen ion concentration inside the cytoplasm is than the outside hydrogen ion concentration of the lake water Figure A) Map of Egypt showing the location of Wadi el-Natrun (red circle). B) a soda lake from Wadi el-Natrun. (Ibrahim et al. Production of extracellular alkaline protease isolated from hyper saline soda lakes. Electron. J. Biotechnol. [online]. 2015, vol.18, n3, pp. 236-243. ISSN 0717-3458) O 1.4 times greater

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Production of extracellular alkaline protease isolated from hyper saline soda lakes by new haotolerant alkaliphilic is 1.4 times greater.

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