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    STUDIA BIOLOGIA - Issue no. 2 / 2005  
         
  Article:   TAXONOMY AND PHYSIOLOGY OF THE OBLIGATELY CHEMOLITHOAUTOTROPHIC, ALKALIPHILIC SULFUR-OXIDIZING BACTERIA FROM SODA LAKES.

Authors:  HORIA L. BANCIU. 		 
       
         
  Abstract:  Saline environments result from a complex interaction of the biogeochemical, geographical and climatic conditions. Based on these particularities acidic, neutral or alkaline saline lakes may occur and they are met on every continent on Earth. Natural element cycling in these environments is sustained by a broad variety of life forms among which the bacteria play a dominant role. One category of saline environment is represented by lakes with high alkalinity and salinity - the soda lakes. Surprisingly, the biomass production and the biodiversity in these (extreme) environments are very high. In the present review we are dealing with the taxonomy and physiology of microbiological groups involved in the oxidation of sulfur that take place in the soda lake habitats. Three taxonomical groups of sulfur-oxidizing bacteria have been described to date, all of them belonging to gamma-Proteobacteria. They differ significantly in their morphology, physiology and biochemical composition, occupying particular and important places in the biological sulfur cycling occurring in the saline-alkaline lakes.  
         
     
         
         
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