A culture technique for experimental studies of embryonic development in the pond snail<i>Lymnaea stagnalis</i>
Bibliographic record
Abstract
Summary The gastropod mollusc Lymnaea stagnalis has long played an important role in strengthening our knowledge of developmental biology. However, experimental studies of this and related species have been limited because its embryos develop within egg capsules, which prevent the passage of large molecules and puncturing the capsules results in disrupted development and eventual death. Therefore, long-term experiments involving administration of substances, cell ablations or dye injections have been impossible. The present study explores conditions for culturing embryonic L. stagnalis outside the capsule. The most effective method consisted of raising embryos within capillary tubes and bathed in their natural capsule fluid. Additional experiments were also performed to test the extent to which the capsule fluid could be replaced with artificial media. Results revealed that certain artificial media could sustain prolonged survival of the embryos but that inclusion of a proportion of natural capsule fluid was essential for development to proceed past a mid-veliger stage. Therefore, a range of concentrations of the capsule fluid was tested and it was found that a minimum of 30% natural capsule fluid diluted with either an artificial culture medium or distilled water permitted normal development. These results suggest that the capsule fluid may contain a factor(s) which is required for normal development in this species. We also tested the possibility that such a factor is a growth factor. However, solutions of nerve growth factor (β-NGF), transforming growth factor (TGF-β1) and epidermal growth factor (EGF) were not sufficient to support embryonic development.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".