Negative incremental resistance induced by calcium in asymmetric nanopores.
basic_science · Level V
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- Record sourced from PubMed, PMID 16522045.
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Abstract
Single polymer nanopores with permanent surface charges act as rectifiers of ionic current. The pores are tapered cones with narrow openings of several nanometers and wide openings of approximately 1 mum. The pores are cation-selective, and in symmetric solutions of potassium chloride they rectify the flow of potassium ions from the small opening toward the wide opening. Millimolar concentrations of calcium reverse the rectification, and a negative incremental resistance is observed. These observations can be interpreted by a model containing flashing ratchets.
Medical subject headings
- Calcium
- Nanostructures