TABLE 2.

Alginate production and encystment in different A. vinelandii strains

Strain	Genotype	Mean alginate concn (μg/mg of protein) ± SEM		Mean encystment (%) ± SEM
		BSa	BBb
ATCC 9046	Wild type	3,612 ± 624	2,648 ± 322	5.16 ± 1.7
ATR8	algR::Tcr	1,357 ± 92	920 ± 20	0.004 ± 0.002
ATR801	ATR8/algR+	4,171 ± 292	NDc	1.19 ± 0.13
ATR9	algR+	ND	ND	1.05 ± 0.19
WI12	algD::lacZ	259 ± 45	1,121 ± 148	5.21 ± 1.0

^aBS, Burk’s nitrogen-free salts supplemented with 2% sucrose as a carbon source. 

^bBB, Burk’s nitrogen-free salts supplemented with 0.2% n-butanol as a carbon source. 

^cND, not determined.