Mineralization of RDX by the White Rot Fungus <i>Phanerochaete chrysosporium</i> to Carbon Dioxide and Nitrous Oxide
Why this work is in the frame
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Bibliographic record
Abstract
Biodegradation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) in liquid cultures (initially at 62 mg/L) was studied using the white rot fungus Phanerochaete chrysosporium . With RDX as the main source of nitrogen, complete disappearance occurred after 60 d. The major products of RDX transformation were CO 2 and N 2 O, and both gases appeared after a 2-d lag period. Following 60 d, an average of 52.9% [UL- 14 C]-RDX was mineralized to CO 2, 10.7% was taken up as biomass by the fungi, and 28.3% remained in the aqueous phase as unidentified metabolites. Of the nitrogen in RDX, 62.0% was transformed to N 2 O. Transformation of ring-labeled [ 15 N]-RDX, with subsequent analysis by GC−MS, indicated that the N 2 O was composed of one nitrogen atom from the RDX ring and the other nitrogen from one of the nitro group substituents. Oxidation of RDX was correlated with manganese peroxidase (MnP) enzyme activity (lignin peroxidase (LiP) activity was absent). Traces of 1-mononitroso-3,5-dinitro-1,3,5-triazine were evident throughout the course of the experiment. Results of this study provide new information regarding N 2 O as a major product of RDX mineralization. Quantification of N 2 O at sites contaminated with RDX may be an important parameter for monitored natural attenuation.
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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 | 0.001 |
| 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) | 0.000 | 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 it