971942.fig.007a
(a)
971942.fig.007b
(b)
971942.fig.007c
(c)
971942.fig.007d
(d)
Figure 7: Contact angles of the carbon plate as model electrode (a), MWNT-modified electrode (b), COOH/MWNT-modified electrode (c), and AChE-ChOx/COOH/MWNT-modified electrode (d).