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Calcification roasting-acid leaching is a clean, efficient, and environmentally friendly process, but in the roasting process, the local temperature is often too high, the heat release is not timely, and the heat transfer is blocked. Furthermore, the material is easy to sinter, which affects the final vanadium extraction effect. In this paper, a small amount of CeO 2 was introduced in the roasting process of vanadium slag to promote the calcified roasting. The results showed that the vanadium leaching rate reached 93.17% with the addition of 0.1 wt % CeO 2 at a roasting temperature of 750 °C, which was higher than that obtained without CeO 2 addition (90.00%). The results of XPS, XRD, and SEM-EDS analyses confirmed that adding CeO 2 to the roasted clinker significantly increased the proportion of pentavalent vanadium to the total vanadium by up to 28.64%. O 2 -TPD analysis revealed an enhanced chemisorbed oxygen with the CeO 2 -assisted roasting, indicated the activation of oxygen by CeO 2 , and resulted in an enhanced oxidation of vanadium. The work in this paper establishes an alternative route for catalytic oxidation-enhanced vanadium slag roasting, which can improve the utilization of vanadium slag at relatively lower temperatures under the action of CeO 2 and is of positive significance in solving the problems of sintering and energy consumption in the roasting process., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)

Objective: Ischemia-reperfusion (I/R) is a main cause of acute kidney injury (AKI). The renal expression profiles of microRNA (miRNA) and time course of their changes after renal I/R were explored to screen acute AKI prognostic-related microRNAs and biomarkers., Methods: The expression profile of miRNA was analyzed for detecting miRNAs in kidney after renal I/R injury. Real-time polymerase chain reaction (PCR) was performed to validate the results of microarray. And the relationship was examined between kidney injury and time course of changes in selected miRNAs., Results: Twenty-one miRNAs were differentially expressed in kidney of rats with renal I/R injury. And 5 miRNAs had prominent differences. miR-17-5p, miR-21 and miR-106a were selected for further confirmation by quantitative real-time-PCR. And the results were consistent with those of microarry. During early stage (4 h) after I/R, the expression level of miR-17-5p significantly increased (P < 0.05). And it occurred earlier than those of BUN level and plasma concentration of neutrophil gelatinase-associated lipocalin (NGAL). Renal expressions of miR-21 and miR-106a were significantly elevated in ischemia 20 min and 30 min groups at 12 h and 24 h post-reperfusion (P < 0.01). And the trend was in accordance with those of BUN and NGAL., Conclusions: miR-21, miR-17-5p and miR-106a are differentially expressed during different phases of renal I/R injury. And miR-17-5p is more sensitive than BUN and NGAL so that it is a more ideal biomarker for AKI.

The aim of the present study was to explore the value of subcutaneous nephrovesical bypass (SNVB) for the treatment of ureteral obstruction due to pelvic metastatic disease. SNVB stents (n=30) were implanted in 24 patients with advanced metastatic disease between January 2008 and December 2012. Urinalysis, serum creatinine (SCr), glomerular filtration rate (GFR), quality of life (QoL) scores, and renal ultrasonography were evaluated at follow-up. The SNVB procedures were successful in all 24 patients. Patient follow-ups occurred at an average of 10.6 months. Preoperative hydronephrosis was eliminated in 16 cases (53.3%) and reduced in the remaining patients. Following surgery, SCr levels reduced significantly from 256±46 to 124±23 μmol/l (P<0.001). GFRs increased from 25±4.8 to 45±5.3 ml/min (P<0.01). The mean QoL scores were 3.4±1.4 preoperatively and 7.6±1.0 postoperatively (P<0.001). The results showed that SNVB is a minimally invasive, effective and safe procedure for patients with ureteral obstruction resulting from advanced malignant disease. As an alternative procedure to percutaneous nephrostomy, SNVB offers patients a better QoL.