Bibliographic record
Abstract
St. John's wort is a herbal medicine well known for its anti-depressant effect. It contains anthraquinone derivates, prenylated floroglucinols, tannins, hydroxycinnamic acids, and especially flavonoids, which have a wide range of biological effects on the body including antioxidant properties. Antioxidants are one of the possibilities to protect body from harmful influences of free radicals - highly reactive particles that damage biological structures. In this work, two methods (DPPH and superoxide radical) were used to determinate antioxidant activity of methanolic and aqueous extracts of dried St. John's wort - Hypericum Perforatum L. and its callus and suspension explant cultures. The results are processed into tables and graphs which compare the effectiveness of extracts to quench the radicals. EC50 for the methanolic extract was 0,064 mg/ml and for the aqueous extract 0,068 mg/ml. EC50 for the aqueous extract was 16,727 mg/ml, but unfortunatelly the other antioxidant activity values for EC50 were too low to evaluate. Determination of the content of flavonoids hyperoside and quercetin by high performance liquid chromatography shows that their highest content is in the drug extracts and that the explant cultures have negligible content of the flavonoids. There is no content of hypericin in all...
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".