Microbial Ecology of Dry Permafrost from Elephant Head, Antarctica
Bibliographic record
Abstract
The objective of this thesis is to determine if a viable, active microbial community could persist in cold, oligotrophic, dry permafrost soils from Elephant Head, Antarctica. Low amounts of microbial activity were measured in some microcosm samples at 5, 0, and -5C, as assessed using radiorespiration assays with radiolabeled acetate as a carbon source. Microbial communities were similar to other Antarctic environments and appear adapted for survival to cold, dry, oligotrophic conditions based on metagenomic, bacterial and fungal amplicon sequencing. The presence of viable microorganisms was confirmed through cultivation which isolated ~20 psychrotrophic organisms including Arthrobacter agilis strain Ant-EH-1 which is capable of cell division at -5C. The genome of A. agilis Ant-EH-1 was sequenced and was found to contain many genes for adaptation to cold, oligotrophic conditions. Together these results show that dry permafrost environments do not exclude active microbial life at sub-zero temperatures.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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) | 0.001 | 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".