Analysing diversity among β-lactamase encoding genes in aquatic environments Henriques, Isabel ; Moura, Alexandra ; Alves, Artur ; Saavedra, Maria José ; Correia, António Abstract Publication: FEMS Microbiology Ecology Pub Date: June 2006 DOI: 10.1111/j.1574-6941.2006.00073.x Bibcode: 2006FEMME..56..418H