Abstract
In this study, we investigated the relationship between cell counting units and biomass forPseudomonas aeruginosa since microbial parameters often need to be defined as mass rather than colony forming unit (CFU) or optical density (OD) which is easily measurable using plate counting method or spectrophotometer especially for any attempt in modeling of contaminant transport and biodegradation in aquifer systems. Results showed that 1.0 OD corresponded to 2.04 × 108 CFU/ml and 2.085 mg/ml with well defined linear relationships of Y (CFU/ml) = 2.0 × 108 X (OD600) + 4.0 × 106 and Y (mg/ml) =2.0087 × (OD600) + 0.0764. Key words: Cell counting unit, colony forming unit, optical density, Pseudomonas aeruginosa.
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