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. 2014 May 23;9(5):e98542. doi: 10.1371/journal.pone.0098542

Table 2. Numbers of heterotrophic bacteria in pipe biofilms based on plate count assay.

Sampling Date Number of Bacteria (cfu cmāˆ’2)1
February 2011 215 a
July 2011 10,887 b
December 2011 2,013 a
March 2012 36 a
August 2012 23,167 c
1

Data points represent mean values (nā€Š=ā€Š3) and data points followed by different letters are significantly different based on ANOVA and Tukey's HSD posthoc test (p<0.05).