TABLE 1.

Polymer production and encystment in A. vinelandii strains^a

Strain	Alginate production (μg/mg of protein)			PHB production (μg/mg of protein)	Encystment (%)
	BSb		BBc
	Liquid	Solid
ATCC 9046	1,667 ± 11	1,246 ± 15	1,717 ± 11	413.1 ± 17.8	7.2 ± 1.5
ATCC 9046/pSMU588	666 ± 39	NDd	ND	ND	ND
ATCC 9046/pSMU588-21	1,320 ± 68	ND	ND	ND	ND
ATCC 9046/pMC15	16 ± 1.8	ND	ND	48.5 ± 0.5	ND
JM1	19 ± 1.5	411 ± 25	38 ± 2.8	ND	<0.0001
JM2	36 ± 2.3	465 ± 53	29 ± 3.5	49.6 ± 0.9	ND

^aAlginate production was determined as previously described (21); all determinations were done in triplicate. PHB production was determined as previously described (29), in cells grown for 48 h in Burk's liquid medium supplemented with 2% sucrose. Values are means ± standard errors of the means. 

^bBS, Burk's medium supplemented with 2% sucrose as the carbon source. 

^cBB, Burk's medium supplemented with 0.2% n-butanol as the carbon source. 

^dND, not determined.