FN Archimer Export Format PT J TI A marine bacterial adhesion microplate test using the DAPI fluorescent dye: a new method to screen antifouling agents BT AF LEROY, Celine DELBARRE LADRAT, Christine GHILLEBAERT, F ROCHET, Marie-Joelle COMPERE, Chantal COMBES, D AS 1:1,4;2:1;3:4;4:1;5:2;6:3; FF 1:PDG-DOP-DCB-BM-BMM;2:PDG-DOP-DCB-BM-BMM;3:;4:PDG-DOP-DCN-EMH;5:PDG-DOP-DCB-ERT-IC;6:; C1 IFREMER, Lab Biotechnol & Mol Marines, Nantes, France. IFREMER, Serv Interfaces & Capteurs, Brest, France. INSA, Lab Biotechnol Bioprocedes, Toulouse, France. C2 IFREMER, FRANCE IFREMER, FRANCE INSA, FRANCE MEXEL SA, FRANCE SI NANTES BREST SE PDG-DOP-DCB-BM-BMM PDG-DOP-DCN-EMH PDG-DOP-DCB-ERT-IC IN WOS Ifremer jusqu'en 2018 copubli-france IF 1.623 TC 40 UR https://archimer.ifremer.fr/doc/2006/publication-2017.pdf LA English DT Article DE ;Antifouling;Pseudoalteromonas;Screening;Microtiter plate;Adhesion;DAPI;Marine biofilm AB Aims: To develop a method to screen antifouling agents against marine bacterial adhesion as a sensitive, rapid, quantitative microplate fluorescent test. Methods and Results: Our experimental method is based on a natural biofilm formed by mono-incubation of the marine bacterium Pseudoalteromonas sp. D41 in sterile natural sea water in a 96 wells polystyrene microplate. The 4'6-diamidino-2-phenylindole (DAPI) dye was used to quantify adhered bacteria in each well. Total measured fluorescence in wells was correlated with the amount of bacteria showing a detection limit of one bacterium per 5 µm2 and quantifying 2 x 107 to 2 x 108 bacteria adhered per cm2. The antifouling properties of three commercial surface active agents and chlorine were tested by this method in prevention of adhesion and also in detachment of already adhered bacteria. The marine bacterial adhesion inhibition rate depending on agent concentration showed a sigmoid shape like dose-response curve. Conclusions: This test is well adapted for a rapid and quantitative first screening of antifouling agents directly in seawater in the early steps of marine biofilm formation. Significance and impact of the study: In contrast with usual screenings of antifouling products which detect a bactericidal activity, this test is more appropriate to screen antifouling agents for bacterial adhesion removal or bacterial adhesion inhibition activities. This screening test focuses on antifouling properties of products, especially the first steps of marine biofilm formation. PY 2007 PD APR SO Letters in Applied Microbiology SN 0266-8254 PU Blackwell science VL 44 IS 4 UT 000245255000005 BP 372 EP 378 DI 10.1111/j.1472-765X.2006.02103.x ID 2017 ER EF