TABLE 1.

Effects of relatively low deficiency (Na medium) and high deficiency (K medium) of C_i,i on different MCYST values, pigment content, relative units of variable fluorescence, and cell size of M. aeruginosa PCC 7808 in batch experiment 1 (n = 3)^a

Medium	MCYST cell quota (fg cell−1), only intracellularb	MCYST production (fg cell−1 day−1), intracellular + extracellularc	MCYST-LR/[d-Asp3]-MCYST-LR ratiob	% of MCYST extracellularb	Chl a cell quota (fg cell−1)b	Phycocyanin cell quota (pg cell−1)b	Fv,rel (10−4 cell−1)d	Cell diam (μm)b
Na (high Ci,i)	18.0 (0.95)	0.65 (0.3)	0.25 (0.01)	0.21 (0.01)	25.7 (3.5)	1.20 (0.02)	2.55 (0.14)	2.35 (0.01)
K (low Ci,i)	23.7 (0.96)	2.2 (0.3)	0.31 (0.03)	0.47 (0.03)	29.2 (1.6)	2.46 (0.16)	2.64 (0.15)	2.45 (0.04)
P value	0.01e	0.0001e	0.08	0.0007e	0.15	0.001e	0.049e	0.065

^aSee Materials and Methods for an explanation of the treatments. All values are averages for the exponential growth phase. The values in parentheses are standard errors.

^bMeans for exponential growth were tested.

^cA linear mixed model (38) with MCYST as the dependent variable and medium as the independent variable was used; the intercept was assumed to be constant, and only the slope for each replicate with time as a random effect was tested.

^dF_v,rel, relative units of variable fluorescence. Data were fitted by using F_v,rel = a · e^{−b · t} and parameter b was tested.

^eSignificant at α = 0.05.