Intra and extracellular nuclease production by Aspergillus niger and Aspergillus nidulans

Intra and extracellular nuclease production by strains of "Aspergillus niger"and "Aspergillus nidulans" was estimated using a modified DNAse test agar and cell-0free extract assays. Differences in the production of nucleases by A. niger and A. nidulans were observed. These observations suggest that the DNAse test agar can be helpful for a quick screening for some types of nucleases in filamentous fungi. The assays using cell-free extracts can also be useful for initial characterization of other types of nucleases.