Electrochemical Characterization of Site‐Specifically Metal‐Modified DNA Films on Gold Electrode Surfaces
Bibliographic record
Abstract
The electrochemical characterization of DNA films with different base mismatches or with Cu II ‐ or Ag I ‐mediated pairs was carried out to assess possible immobilization and interaction effects. Toward this end, 3‐hydroxy‐2‐methylpyridin‐4(1 H )‐one ( H ), imidazole‐4‐carboxylate ( K ), purine‐6‐carboxylate ( P ), and 7‐deaza‐6‐pyrazolylpurine ( D ) were used as artificial metal‐binding nucleobases. Cyclic voltammetry and square‐wave voltammetry confirmed the immobilization of suitably modified oligonucleotides on Au electrodes. The incorporation of the metal ions into the base mismatches to form metal‐mediated base pairs showed a negligible effect on the peak potentials. Ambiguous electrochemical impedance spectroscopy results were obtained for DNA with metal‐mediated base pairs, as some duplexes showed no effect of metal ion addition, while others showed variable charge transfer resistance ( R CT ) with no discernible pattern. Notably, the formation of Ag I ‐mediated base pairs induced larger relative changes in R CT compared to Cu II ‐mediated base pairs. Amongst the latter, only strands containing the artificial nucleobase H showed statistically relevant sequence‐ and distance‐dependent charge transfer changes upon metalation. The data indicate that neither nucleobase charge nor nucleobase size directly correlates with the charge transfer resistance, but suggest that changes in DNA film stiffness and hence permeability outweigh other effects.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".