Fundamentals
Fundamentals is part of the Nanopore Wiki learning path. Nanopore signals arise from ionic transport, pore geometry, molecular occupancy, electrostatic interactions, and measurement noise.
Core concepts
- Conductance links current, voltage, pore geometry, and solution conductivity.
- Access resistance becomes important at nanometer length scales.
- Electrophoresis and electroosmotic flow can both affect capture and translocation.
- Filtering can reduce noise but also distort fast events.
Scientific basis
- Conductance links current, voltage, pore geometry, and solution conductivity.
- Access resistance becomes important at nanometer length scales.
- Interpretations should be tied to measurable quantities, experimental controls, and documented analysis settings.
- Claims should distinguish direct observations from downstream inference.
Concept map
| Step | Description |
|---|---|
| 1 | Voltage drives ions and charged molecules through or near the pore. |
| 2 | The pore and nearby access regions set the baseline conductance. |
| 3 | A molecule changes the local conductive pathway and produces an event. |
| 4 | Electronics and signal processing determine what features remain observable. |
Typical applications
- Interpreting current traces.
- Choosing voltage, salt concentration, sampling rate, and bandwidth.
- Understanding why experiments fail or produce ambiguous signals.
Quality checks
- Record platform, pore or flow-cell type, chemistry, voltage or acquisition settings, and software versions.
- Use negative controls, positive controls, and replicate measurements where the claim depends on specificity.
- Report limitations such as noise, bias, sample degradation, pore instability, or model-dependent analysis.
- Separate physical mechanism, signal-processing choice, and biological interpretation.
Interpretation limits
- Raising voltage without considering pore stability and molecule damage.
- Over-filtering data until events look cleaner but lose true kinetics.
- A single result should not be generalized beyond the sample, protocol, instrument state, and analysis pipeline used.
- Medical, legal, regulatory, or commercial decisions require domain-specific validation beyond this educational summary.