Isolation and characterization of carbonic anhydrases from the marine diatom <i>Phaeodactylum tricornutum</i>
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Bibliographic record
Abstract
Carbonic anhydrase (CA) isozymes were identified and isolated from three strains of Phaeodactylum tricornutum [University of Texas Culture Collection (UTEX 640), North Eastern Pacific Culture Collection at the University of British Columbia B31 and Culture Collection of Algae and Protozoa 1052/1A]. External (CA ext ) and internal CA activity was detected by potentiometric assay of intact cells and cell homogenates of air and high CO 2 ‐grown cells. CA ext was detected only in UTEX 640 grown under CO 2 ‐limited conditions and present in trace amounts in cells grown on high CO 2 . CA isozymes in cells extracts were separated by cellulose acetate electrophoresis and by sodium dodecyl sulfate‐polyacrylamide gel electrophoresis. All three strains had two CA bands in common, while UTEX 640 had a third, faster‐running band which was absent from extracts of high CO 2 ‐grown cells and thus was the external isozyme. The internal CA isoforms of the UTEX 640 strain were shown to have molecular masses of 28 and 25 kDa, and the external 24 kDa. A fourth CA ext isozyme with a molecular weight of 23.5 kDa was later detected using a polyclonal CA antibody. The CA isozymes were low‐CO 2 ‐inducible proteins because Western blot analysis, using a polyclonal antibody, indicated that CA expression was repressed in high CO 2 ‐grown cells. CA localization, using both immunofluorescence and immunogold techniques, with air‐grown cells indicated that the CA ext was located in the periplasmic space and on the cell membrane, whereas in high CO 2 ‐grown cells only internal CA was detected.
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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 | 0.000 |
| 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 it