"catalytic activity concentration"@en . _:b19755 . _:b19760 . _:b19760 . . _:b19756 . . _:b19756 . _:b19756 . _:b19755 . _:b19760 . _:b19755 . "catalytic concentration"@en . . _:b19755 _:b19756 . _:b19760 .