Amplification of the Second Internal Transcribed Spacer Ribosomal DNA of Individual Trichostrongylid Nematode Larvae by Nested Polymerase Chain Reaction
Bibliographic record
Abstract
The second internal transcribed spacer (ITS2) of ribosomal DNA (rDNA) is used as a genetic marker to identify trichostrongylid nematodes. However, it is often difficult to amplify by polymerase chain reaction (PCR) the ITS2 rDNA of a single trichostrongylid nematode larva or egg. A nested PCR (nPCR) assay was, therefore, developed to amplify the ITS2 from individual trichostrongylid nematode larvae. The results show that the ITS2 rDNA of a significantly greater proportion of individual larvae was amplified using nPCR compared with a standard PCR. There was also no need to column-purify the genomic DNA before nPCR, which is more time and cost effective for studies involving large sample sizes. The amplicons produced from the secondary phase of the nPCR were subjected to single-strand conformation polymorphism analyses and DNA sequencing to confirm the species identity of the larvae used in the current study as Ostertagia gruehneri. The nPCR assay was also used to amplify the ITS2 from individual trichostrongylid eggs. The ability to amplify the ITS2 rDNA from large numbers of individual nematode eggs and larvae has important implications for diagnostic testing and for conducting epidemiological studies on these parasites of veterinary importance.
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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 | 0.001 | 0.001 |
| 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 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".