Basel affecting the bank behaviour?
Interesting question. Indeed, Basel/I,II,III-type regulation changes the behavior of banks, that´s probably the goal of said regulation.

Its possible that their market behavior with respect to "notes" (which notes?) has changed. 

bason on the typical Modigiliani/Miller intuition, it seems that there is no reason why Basel/type regulation will affect a sector or another. The main effects are in changing how firms get financed. If banks are expected to hold senior debt, then firms are more likely to issue senior debt. This changes how funds are intermediated from savers to investors, but in principle it should not change which sectors are financed. It should only affect how they are financed, with equity, preferred, junior debt, senior debt, senior collateralized debt, etc.