Bibliographic record
Abstract
An improved protocol for measuring light-dependent proton translocation across the membrane of isolated thylakoids is described. The method uses a pH electrode attached to data acquisition software to measure the pH increase in the bathing solution as protons are pumped from the solution to the internal compartments of the thylakoid vesicles. Up to the point of light saturation, the magnitude of proton movement depends on irradiance level. Proton translocation is inhibited in a concentration-dependent manner in the presence of dichlorophenyl dimethyl urea (DCMU). In the presence of gramicidin D, a proton gradient across the membrane can be neither established nor maintained. Depending on its redox state, dichlorophenol indophenol (DCPIP) can act as an electron donor or acceptor to or from different components of the thylakoid membrane. Studies using oxidized or reduced DCPIP with or without a high concentration of DCMU demonstrate that both linear and cyclic electron flow both result in light-dependent proton translocation. Proton translocation is a fundamental process used by most types of organisms to create a transmembrane proton gradient that provides the energy for ATP synthesis. The value of the described method is that students can directly measure the disappearance of protons from the thylakoid suspension solution and, by adding DCMU and oxidized or reduced DCPIP, demonstrate the coupling of electron transport to proton translocation in the thylakoid membrane.
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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".