The Alterations of Biofilm Formation and EPS Characteristics of a Diatom by a Sponge-Associated Bacterium Psychrobacter sp.

Table 1

Cell distributions in the floating phase and biofilm of diatom Stauroneis sp. incubated in the presence of bacterial supernatant crude extract.

Cell distribution	Control			Treatment
	Dry weight (g)	Cell density (×10^5 ml^−1)	Percentage (%)	Dry weight (g)	Cell density (×10^5 ml^−1)	Percentage (%)
Biofilm	0.245 ± 0.014	4.091 ± 0.218	42	0.147 ± 0.016	2.577 ± 0.255	29
Floating	0.333 ± 0.013	5.466 ± 0.199	58	0.357 ± 0.021	5.833 ± 0.326	71
Sum	0.578 ± 0.008	9.557 ± 0.124	—	0.504 ± 0.010	8.409 ± 0.157	—
Biofilm/floating	0.736 ± 0.066	0.750 ± 0.063	—	0.414 ± 0.070	0.444 ± 0.068	—

Cell weights and cell densities were independently measured at least three times, and the means and standard deviations are shown. Independent t-test was used to compare the control and treatment. Percentages were calculated based on the means of cell weights and indicated the cell distribution between biofilm and floating phases. .