FIG. 5.

Northern analysis of the induction of aguA on different carbon sources. The top panel was probed with the internal 2-kb SalI fragment of aguA, and the bottom panel was probed with a 700-bp EcoRI fragment from the A. niger 18S ribosomal DNA and served as a loading control. Lane 1, mycelium from the preculture on fructose; other lanes, mycelium transferred to the following carbon sources: lane 2, 1% glucose; lane 3, 1% fructose; lane 4, 1% xylose; lane 5, 1% arabinose; lane 6, 1% glycerol; lane 7, 1% glucuronic acid; lane 8, 0.2% xylobiose; lane 9, 0.5% birchwood xylan; lane 10, 1% xylose–0.2% glucose; lane 11, 1% xylose–1% glucose; lane 12, 1% xylose–2% glucose; lane 13, 0.5% birchwood xylan–1% glucose; lane 14, 1% glucose–1% glucuronic acid; lane 15, 1% fructose–1% glucuronic acid; lane 16, 1% xylose–1% glucuronic acid; lane 17, 1% arabinose–1% glucuronic acid; and lane 18, 1% glycerol–1% glucuronic acid.