[Study of the physiological characteristics of a strain which can change the color of red lead on Dunhuang mural].
A strain which was isolated from Dunhuang Murual was investigated. It belongs to Flavobacterium. In media added in Pb3O4, colonies show brown and black. After identified pigments, it showed that the brown was caused by the oxidation of Pb3 O4 into PbO2 by the strain. The optimal oxidative condition is at pH 9.8, 37 degrees C and dark environment. The genes for oxidation is on plasmid and the oxidation was inhibited under pure O2 and N2 conditions, too 5 x 10(-3) mol/ml NaN3 is enough. The strain was able to absorb lead initiative. The transmission electron microscope showed that lead locate in protoplasts.
Feng
Q
Q
Department of Biology, Lanzhou University, Lanzhou 730000.
Yang
L
L
Zhang
X
X
Ma
X
X
D003116:Color; D004396:Coloring Agents / Q000378:metabolism*; D003470:Culture Media; D005417:Flavobacterium / Q000145:classification / Q000302:isolation & purification / Q000502:physiology*; D007854:Lead / Q000378:metabolism*; D010084:Oxidation-Reduction; D010151:Paintings; D010957:Plasmids
D004396:Coloring Agents; D003470:Culture Media; D007854:Lead