Continuous Production of Mixed Lactic Starters Containing Probiotics Using Immobilized Cell Technology
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
The production of a mixed lactic culture containing Lactococcus lactis subsp. lactis biovar. diacetylactis MD and Bifidobacterium longum ATCC 15707 was studied during a 17-day continuous immobilized-cell culture at different temperatures between 32 and 37 degrees C. The two-stage fermentation system was composed of a first reactor (R1) containing cells of the two strains separately immobilized in kappa-carrageenan/locust bean gum gel beads and a second reactor (R2) operated with free cells released from the first reactor. The system allowed continuous production of a concentrated mixed culture with a strain ratio whose composition depended on temperature and fermentation time. A stable mixed culture (with a 22:1 ratio of L. diacetylactis and B. longum) was produced at 35 degrees C in the effluent of R2, whereas the mixed culture was rapidly unbalanced in favor of B. longum at a higher temperature (37 degrees C) or L. diacetylactis at a lower temperature (32 degrees C). Strain redistribution in beads originally immobilizing pure cultures of L. diacetylactis or B. longum was observed. At the end of culture, the strain ratio (7:1 L. diacetylactis/B. longum) in bulk bead samples was similar to that of individual beads. The determination of the spatial distribution of the two strains in gel beads by immunofluorescence and confocal laser-scanning microscopy showed that bead cross-contamination was limited to a 100 microm peripheral layer. Data from this study validate a previous model for population dynamics and cell release in gel beads during mixed immobilized-cell cultures.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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 it