Table 2.

Changes in saxitoxin content of C. raciborskii (T3) cells cultivated with salts at different sampling times.

Growth medium	Fold change from day 6 to 12 a
	Total	neoSTX	STX
Control	+3.1	+2.9	+5.6
CaCO3 5 mM	+7.7	+7.7	+9.0
MgCO3 5 mM	−1.7	−1.2	−13.0
Na2CO3 5 mM	−3.0	−2.7	−6.8
CaCl2 5 mM	−2.7	−2.1	−7.1
MgCl2 5 mM	−1.1	−1.3	+1.44
NaCl 5 mM	+2.6	+2.1	+6.2
CaCl2 10 mM	+1.3	+1.3	+1.6
MgCl2 10 mM	+1.6	+1.6	+1.6
NaCl 10 mM	+1.1	+1.1	+1.1

^a Positive signal (+) refers to increases in the STX cell quota, and a negative signal (−) refers to decreases in the STX cell quota.