Preparation and Separation of Intact Chromosomes of Vertebrates by One-Dimensional Pulsed-Field Gel Electrophoresis (ODPFGE)
Bibliographic record
Abstract
This novel way of preparing chromosomes for pulsed-field gel electrophoresis (PFGE) takes advantage of the fact that the whole chromosome population is synchronized in metaphase. This is a very important step toward their intact separation by PFGE; for instance, a standard preparation as used for digestion with rarecutter enzymes shows a different pattern of resolution, characterized by diffuse bands and nonspecific migration (see Chapter 7 ). Here, vertebrate chromosomal DNA was prepared by a modified chromosome isolation procedure for flow cytometry (1). This procedure involves lysis of cells (blocked in metaphase by colcemide) with digitonine in the presence of spermidine and spermine as described below. The structural integrity of metaphase-blocked chromosomes is given by the presence of spermine and spermidine, which act as chromosomal morphology stabilizers. The digestion with proteinase K is carried out as described before in order to eliminate chromosomal proteins. The pulse parameters for separating intact chicken microchromosomes by one-dimensional pulsed-field gel electrophoresis (ODPFGE) are also given.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".