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Optimization of the treatment of copper objects with B. bassiana. (A,B) Aspect of samples immersed in liquid medium inoculated with B. bassiana cultures after 3 weeks incubation. Objects depicted: (A) C1 and C2, (B) W33, and W34. Embedded images present samples before treatment. (C,D) Optical microscopy observations of MA (C) and MABRO (D) medium after 7 days incubation of B. bassiana with R1 and R2 samples respectively. Red circles indicate the presence of copper oxalates.
