Bibliographic record
Abstract
Abstract Membrane lipids of Archaea are unique and distinct from those found in Eukarya and Bacteria . The polar lipids consist of isoprenoid chains, 20–40 carbons in length and usually saturated, which are attached via stable ether bonds to the glycerol carbons at the sn ‐2,3 positions. Polar head groups differ at the genus level of diversity and consist of mixtures of glyco groups (mainly disaccharides), and/or phospho groups primarily phosphoglycerol, phosphoserine, phosphoethanolamine or phosphoinositol. Phosphocholine headgroups are rarely found. Extremely halophilic archaea are characterised by headgroups consisting of phosphoglycerolphosphate‐ O ‐methyl, and sulfated‐sugars. Some of these archaea synthesise cardiolipin analogues. The inherent stability and unique features of archaeal lipids makes them a useful biomarker for Archaea within environmental samples, including ocean sediments. The polar lipids of Archaea can be used to make liposomes (closed vesicles referred to as archaeosomes) with characteristics that are useful for applications in biotechnology. Archaeal‐like polar lipids are being synthesised to optimise the properties of archaeosomes to serve as next‐generation adjuvants and drug delivery systems. Key Concepts: Archaeol (2,3‐diphytanyl‐ sn ‐glycerol), and variations thereof, define the polar lipids of the domain of life, Archaea . The structures of polar lipids biosynthesised provide a useful taxonomic feature to assign an isolate to the Genus level of classification. New polar lipid structures are being reported as the field expands to encompass novel isolates. These unique polar and neutral isoprenyl lipids can be used as biomarkers of archaea in environmental samples. Archaeal lipids can serve as a rich source for novel molecules not commonly found in nature, such as β‐ l ‐gulose. Archaeal polar lipid mixtures hydrate to form lipid membrane vesicles (archaeosomes) with bilayer, unilayer or a combination of uni and bilayer structure. Archaeosomes are generally nonfusogenic in vitro , but fusion can be dramatic for certain compositions by exposure to the combination of acidic pH, calcium and glycosidase. Archaeosomes function as safe vaccine adjuvants in mammals imparting long‐lasting CD8 + T‐cell immunity and antibody responses. Isoprenoid lipids that retain the key archaeal‐lipid features are being synthesised to optimise their properties as vaccine adjuvants and delivery systems.
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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 | 0.001 |
| 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 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".