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2 protocols using yeast nitrogen base broth

1

Fungal Biofilm Formation Protocol

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Yeasts were grown on SD and after in Yeast Nitrogen Base broth (YNB -Sigma-Aldrich) at 37°C for 24 h each growth. Fungal suspension was centrifuged at 2000 rpm/10 min (MPW-350, Warsaw, Poland), supernatant was replaced with saline (0.9% NaCl) and another centrifugation was performed, this procedure was performed twice. Turbidity of the fungal suspension was adjusted in a spectrophotometer (530 nm; 0.381 ± 0.02) to obtain an inoculum of 10 7 CFU/mL. This standardized suspension was added in microplate wells (200 μL/well) and incubation (37°C/90 min) under agitation (75 rpm -Quimis, Diadema, Brazil) was performed. After preadherence of the fungal cells, supernatant was replaced with YNB broth and biofilm was formed for 48 h. Culture medium was exchanged after 24 h of incubation (de Oliveira et al. 2017) .
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2

Standardized Microbial Culture Conditions

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Reference strains from American Type Culture Collection (ATCC) were used such as C. albicans (ATCC 18804), E. faecalis (ATCC 4083), P. aeruginosa (ATCC 15442), S. aureus (ATCC 6538), S. mutans (ATCC 35688), F. nucleatum (ATCC 25586), P. endodontalis (ATCC 35406), P. gingivalis (ATCC 33277), and P. micra (ATCC 23195). The microorganisms were frozen at -80 °C, and activated in a specific culture medium according to the metabolic needs, being Yeast Nitrogen Base broth (YNB -Sigma-Aldrich, St. Louis, USA), for C. albicans, and Brain Heart Infusion broth (BHI -Himedia), for aerobic bacteria. They were incubated at 37 °C for 24 h, with 5% CO2 for S. mutans. For anaerobic bacteria, Brucella broth (Acumedia, Michigan, USA) supplemented with 5% sterile defibrinated sheep blood (Newprov, Pinhais-PR, Brazil), 1% hemin (Sigma-Aldrich), and 1% menadione (Sigma-Aldrich) was used. These bacteria were incubated in anaerobiosis with nitrogen 80.01%, carbon dioxide 10.02%, and hydrogen 9.97%; (Whitley DG250 Workstation, West Yorkshire, UK) at 37 ºC for 48 h.
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