Aglomerular kidney function when challenged with exogenous MgSO<sub>4</sub> loading or environmental MgSO<sub>4</sub> depletion
Bibliographic record
Abstract
The goal of this study was to investigate the role of MgSO4 in aglomerular kidney function, independent of changes in NaCl. The renal handling of MgSO4 was manipulated by intravenous infusion of an isoosmotic solution containing 80 mmol/L MgSO4 or through exposure to an environment that was reduced in MgSO4 concentration by 90%. Intravenous infusion resulted in a transient increase in circulating Mg2+ and SO4 (2-) levels; however, the concentration of both divalent ions in the urine remained elevated throughout the entire infusion period. Infusion also resulted in a transient increase in urine flow rate and apparent glomerular filtration rate, measured using the glomerular filtration rate marker, [3H] PEG 4000. Exposure to MgSO4-depleted conditions resulted in a significant decrease in plasma and urine concentrations of Mg2+ and in the urine concentrations of SO4 (2-); correspondingly, urine flow rate was significantly depressed. The urinary excretion of both Mg2+ and SO4 (2-) demonstrated nonlinear saturation kinetics. The urinary excretion of Mg2+ was significantly correlated with plasma Mg2+ concentration (r=0.75, P=0.04) and yielded a Michealis constant (Km) of 1.67+/-1.43 mmol/L; P=0.26 and a maximal velocity (Vmax) of 117.4+/-47.0 micromol/kg/hr; P=0.046. The urinary excretion of SO4 (2-) was significantly correlated with plasma SO4 (2-) concentration (r=0.94, P<0.02) with a Km of 0.76+/-0.54; P=0.26 and a Vmax of 59.3+/-13.1; P=0.02.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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 | 0.001 | 0.001 |
| 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".