The redox behavior of 2,3,5-triphenyl-2H-tetrazolium chloride (TTC) in the presence of different polyelectrolytes such as poly(sodium 4-styrenesulfonate) (PSS), poly(sodium 4-styrenesulfonate-co-sodium maleate) at two different comonomer compositions (P(SS(1)-co-MA(1)) and P(SS(3)-co-MA(1))), poly(sodium acrylate-co-sodium maleate) (P(AA(1)-co-MA(1))), and poly(sodium acrylate) (PAA) is studied. Due to aromatic-aromatic interactions, the polyelectrolytes containing benzene sulfonate groups produce a decrease on the reduction rate of TTC in the presence of ascorbic acid (ASC) and a shift of the anodic and cathodic peaks to higher negative potentials for the electrochemical reaction of TTC. As an important conclusion, these effects are a function of the linear aromatic density of the polyelectrolytes.
The present study examined brain functions related to information processing in autistic subjects, using auditory evoked potentials (AEP) and missing stimulus potentials (MSP). In order to study the development of autism, autistic adults served as subjects. Normal adults and children also served as control groups. Both normal and autistic adults showed normal patterns and lateralities with respect to AEP for music stimuli, but normal children did not show such matured patterns and lateralities. On the other hand, with respect to MSP, autistic adults showed matured patterns with a specific laterality. These results suggest that autistic subjects might develop some cognitive functions.
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