Ascii export is producing characters that appear in emacs as \200, \300 and in "more" as M-@
e.g.: New insight was provided by \200[Butler:Tsuda97]\200 when they demonstrated convective... ... and: Nevertheless, the mechanism driving this mixing is still not clear. \300 One plausible source, geometric hysteresis of the alveolar wall ... Can anyone shed any insight on this as I have no idea what they mean. They aren't in the original .lyx file. Angus