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Protease activity of Aspergillus niger growing on solid substrate correlated well with conidia formation (R: 0.91–0.96) for initial moisture contents of 38–48% (wet basis), initial pH 5.4 and 6 and temperature (29–37 °C ). However, conidia/protease ratio varied with most of these conditions and by NaCl addition indicating only a partial association between them.
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