The symposium: extremophile prokaryotes: from the diversity to biotechnology presided by Pr Klouche Khelil Nihel Team leader Bactext (lab Lamaabe, fac Snv / stu) turned on prokaryotes named extremophiles: these species were growth under mortal conditions for the most other organisms. This first edition of the symposium aims to expand knowledge about these prokaryotes since it will address all aspects related to these organisms ( algae, bacteria) including their biomolecules. This is a unique opportunity for national and international scientists to take stock of the latest research in this fascinating area