Respiration and ecological niche influence bacterial membrane lipid compositions
Bibliographic record
Abstract
Bacterial membrane compositions vary widely between phyla and within related species. The types of lipids within membranes are as diverse as the selective pressures that influence bacterial lifestyles such as their mode of respiration and habitat. This study has examined the extent that respiration and habitat affect bacterial fatty acid (FA) and polar lipid (PL) compositions. To accomplish this, over 300 FA and PL profiles from 380 previously characterized species were assembled and subjected to multivariate statistical analyses in order to determine lipid to habitat/respiration associations. It was revealed that PL profiles showed a slight advantage over FA profiles for discriminating taxonomic relationships between species. FA profiles showed greater correlation with respiration and habitat than PL. This study identified that respiration did not consistently favour uniform FA or PL changes when lipid profiles were compared between examined phyla. This suggests that although phyla may adopt similar respiration methods, it does not result in consistent lipid attributes within one respiration state. Examination of FA and PL compositions were useful to identify taxonomic relationships between related species and provides insight into lipid variations influenced by the niche of its host.
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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".