Description of Sphingobium psychrophilum sp. nov., a cold-adapted bacterium isolated from Arctic soil
Bibliographic record
Abstract
A yellow-coloured, Gram-stain-negative, non-sporulating, psychrotolerant and motile bacterium, designated AR-3-1 T , was isolated from the Arctic soil of Cambridge Bay, Nunavut, Canada. Strain AR-3-1 T could grow at 4–32 °C and pH 5.0– 11.0. Phylogenetic analysis based on its 16S rRNA gene sequence indicated that strain AR-3-1 T formed a lineage within the family Sphingomonadaceae and clustered as a member of the genus Sphingobium . The closest members within this genus were Sphingobium cupriresistens CU4 T (98.1 % sequence similarity), Sphingobium vermicomposti VC-230 T (97.6 %) and Sphingobium lactosutens DS20 T (97.5 %). The only respiratory quinone was the ubiquinone Q-10. Spermidine was the predominant polyamine. The principal cellular fatty acids were summed feature 8 (C 18 : 1 ω 7 c and/or C 18 : 1 ω 6 c ), summed feature 3 (iso-C 15 : 0 2-OH and/or C 16 : 1 ω 7 c ), C 16 : 0 and C 14 : 0 2-OH. The major polar lipids were phosphatidylethanolamine, phosphatidylmonomethylethanolamine, phosphatidyldimethylethanolamine, diphosphatidylglycerol, phosphatidylglycerol, sphingoglycolipid and phosphoglycolipid. The DNA G+C content was 63.1 %. The average nucleotide identity and in silico DNA–DNA hybridization relatedness values between strain AR-3-1 T and its most closely related genus members were ≤89.6 and 39.6 %, respectively. The genome was 5 162 327 bp long, with 83 scaffolds and 4824 protein-coding genes. The genome showed six putative biosynthetic gene clusters responsible for various secondary metabolites. Based on this polyphasic study, strain AR-3-1 T represents a novel species within the genus Sphingobium , for which the name Sphingobium psychrophilum sp. nov. is proposed. The type strain is AR-3-1 T (=KACC 21613 T =NBRC 114604 T ).
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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".