In studying how neurotransmitters travel between cells — by analysis of events in the dimensions of nanometers — Cornell researchers have discovered that an electrical current thought to be present during that process does not, in fact, exist.
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Prior experiments had suggested that the vesicles contain ion channels that carry charged neurotransmitters from the cell vesicle out of the cell, generating an electrical current flowing out of the cell.
Lindau and colleagues report in their paper that there is no such current present. Their experiments further showed that, instead, the charge compensation is generated by the influx of positive sodium ions from the outside into the vesicles, a process known as electrodiffusion.
(via Brainsturbator).