Isolation and characteization ofAspergillus flavus isolates and specific PCR with ver-1, omt-1, apa-2 and nor-1 primers Thirty-three strains of Aspergillus app., including thirty strains of A.flavus and three strains of A.niger were isolated from many samples collecting from different areas on the North of Vietnam using Samson’s technique in combining with their morphological characteristics. A.niger strains were nonaflatoxigenic and used as negative control.
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