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| Content Provider | PubMed Central |
|---|---|
| Author | Gillespie, Dirk Boda, Dezső He, Yan Apel, Pavel Siwy, Zuzanna S. |
| Abstract | The predictions of a theory for the anomalous mole fraction effect (AMFE) are tested experimentally with synthetic nanopores in plastic. The negatively charged synthetic nanopores under consideration are highly cation selective and 50 Å in diameter at their smallest point. These pores exhibit an AMFE in mixtures of Ca2+ and monovalent cations. An AMFE occurs when the conductance through a pore is lower in a mixture of salts than in the pure salts at the same concentration. For ion channels, the textbook interpretation of the AMFE is that multiple ions move through the pore in coordinated, single-file motion. However, because the synthetic nanopores are so wide, their AMFE shows that single filing is not necessary for the AMFE. It is shown that the AMFE in the synthetic nanopores is explained by a theory of preferential ion selectivity. The unique properties of the synthetic nanopores allow us to experimentally confirm several predictions of this theory. These same properties make synthetic nanopores an interesting new platform to test theories of ion channel permeation and selectivity in general. |
| Related Links | http://dx.doi.org/10.1529/biophysj.107.127985 |
| Ending Page | 619 |
| Page Count | 11 |
| Starting Page | 609 |
| File Format | |
| ISSN | 00063495 |
| e-ISSN | 15420086 |
| Journal | Biophysical Journal |
| Issue Number | 2 |
| Volume Number | 95 |
| Language | English |
| Publisher | The Biophysical Society |
| Publisher Date | 2008-07-01 |
| Access Restriction | Open |
| Rights Holder | The Biophysical Society |
| Subject Keyword | Biophysics Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Biophysics |
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