A new bacterial strain

designated as strain DX1-1

was isolated from acid mine drainage of Dexing mine

Jiangxi Province

China.Basing on morphology、biochemical and physiological characterization

DX1-1 was characterized as facultative autotrophic bacterium.It grew at temperatures ranging from 20 ℃ to 35 ℃and at initial pH values ranging from 2.0 to 5.0.It was affiliated to the genus Acidiphilium according its phylogenetic tree derived from 16sRNA sequence.Furthermore

the capacity of producing polymer granules of strain DX1-1 was found by transmission electron microscope（TEM）.The polymer granules was extracted and detected by infrared ray and ultraviolet radiation.The results showed that it had the same character with poly-β-hydroxybutyrate（PHB）.It suggested that strain DX1-1 might have the potential of synthesizing biodegradable materials（PHB）.