As early as 1936, it was proven that the Dead Sea is not completely abiotic i. e. "dead" . (Elazari,Volcani -1936). Since then, a number of halophitic and halotolerant microorganisms have been isolated from the Dead Sea. Two communities have been observed which are Dunaiiella parva, an alga, and; Sulfur isotope gave evidence (Gavrieli and Bein,1993) indicating sulfate reduction by bacteria.