Table 2. Parameters for the filling of the P66 channel with nonelectrolytes.

Nonelectrolyte	r (nm)	F	F%
Ethylene glycol	0.26	0.75	96.8
Glycerol	0.31	0.80	106.7
Arabinose	0.34	0.78	100.6
Sorbitol	0.39	0.51	65.8
Maltose	0.50	0.76	98.1
PEG 200	0.50	0.49	64.1
PEG 300	0.60	0.33	42.6
PEG 400	0.70	nl	nl
PEG 600	0.80	nl	nl
PEG 1,000	0.94	-0.07	9.0
PEG 3,000	1.44	0.04	5.2
PEG 6,000	2.50	0.04	5.2

F and F% are the absolute ion channel filling and the ion channel filling in terms of percentage, respectively, in the presence of 20% (w/v) nonelectrolytes in the bathing solution 1 M KCl. F and F% were calculated according to Eq. 2 and Eq. 3, respectively. nl. means neglected: the channel fillings of PEG 400 and PEG 600 were neglected and not included in this table, because the calculated values of F and F% were without meaning due to possible interactions of these compounds with the channel interior (for details see text). r  =  hydrodynamic radii of the nonelectrolyte taken from previous publications [17]-[22].