Boron Oxide Nanoparticles Exhibit Minor, Species-Specific Acute Toxicity to North-Temperate and Amazonian Freshwater Fishes
Bibliographic record
Abstract
Boron oxide nanoparticles (nB 2 O 3 ) are manufactured for structural, propellant, and clinical applications and also form spontaneously through the degradation of bulk boron compounds. Bulk boron is not toxic to vertebrates but the distinctive properties of its nanostructured equivalent may alter its biocompatibility. Few studies have addressed this possibility, thus our goal was to gain an initial understanding of the potential acute toxicity of nB 2 O 3 to freshwater fish and we used a variety of model systems to achieve this. Bioactivity was investigated in rainbow trout ( Oncorhynchus mykiss ) hepatocytes and at the whole animal level in three other North and South American fish species using indicators of aerobic metabolism, behavior, oxidative stress, neurotoxicity, and ionoregulation. nB 2 O 3 reduced O. mykiss hepatocyte oxygen consumption ( Ṁ O 2 ) by 35% at high doses but whole animal Ṁ O 2 was not affected in any species. Spontaneous activity was assessed using Ṁ O 2 frequency distribution plots from live fish. nB 2 O 3 increased the frequency of high Ṁ O 2 events in the Amazonian fish Paracheirodon axelrodi , suggesting exposure enhanced spontaneous aerobic activity. Ṁ O 2 frequency distributions were not affected in the other species examined. Liver lactate accumulation and significant changes in cardiac acetylcholinesterase and gill Na + /K + -ATPase activity were noted in the north-temperate Fundulus diaphanus exposed to nB 2 O 3 , but not in the Amazonian Apistogramma agassizii or P. axelrodi . nB 2 O 3 did not induce oxidative stress in any of the species studied. Overall, nB 2 O 3 exhibited modest, species-specific bioactivity but only at doses exceeding predicted environmental relevance. Chronic, low dose exposure studies are required for confirmation, but our data suggest that, like bulk boron, nB 2 O 3 is relatively non-toxic to aquatic vertebrates and thus represents a promising formulation for further development.
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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".