. . _:b19759 . . _:b19759 . . . _:b19749 . _:b19750 . . _:b19759 . . . . _:b19750 . _:b19749 . . . "catalytic activity"@en . _:b19749 _:b19750 . _:b19749 . . _:b19759 . . . . . . . . . _:b19750 . . .