Comparative structure and ultrastructure of the midgut and hepatopancreas of five species of Mysidacea (Crustacea): functional implications
Bibliographic record
Abstract
Comparative structural, ultrastructural, and cytochemical studies were made of the midgut and hepato pancreas of five species belonging to the two suborders of the order Mysidacea, the Lophogastrida and Mysida, under different feeding conditions to investigate their role in digestive processes. Nutritional experiments were also carried out to complete the study. The midgut shows structural differences between the two suborders. The epithelium is composed of a single cell type that is implicated in absorption and production of peritrophic membranes. The intestinal epithelium lies on a characteristic three-layered basal lamina, the thickness of which would increase the strength of the intestinal wall for peristaltis and for transport of fecal pellets. The hepatopancreas displays marked structural differences between the suborders, and the cell distribution is better ordered in Mysida. Absorptive R-cells play an important role in lipoprotein metabolism. B-cells are implicated in intracellular digestion, as is attested to by the presence of a typical vacuolar apparatus. The total absence of the F-cell, considered to secrete enzymes in the Decapoda, raises the question of the origin of the enzymes necessary for extracellular digestion. A review of the cell affiliations of the hepatopancreas in the Mysidacea is required.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 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) | 0.001 | 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 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".