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Eutrophication caused by high nitrate levels in surface and subsurface water bodies is a major ecological concern. This process leads to the proliferation of algae and aquatic plants, which results in a reduction of dissolved oxygen and harm to aquatic organisms. Therefore, it is crucial to explore effective methods to remove nitrate ions from wastewater. In this study, the efficacy of Sargassum polycystum macroalgae as a biosorbent for nitrate ion removal was examined. The experiment investigated the impact of pH variations, initial biomass of S. polycystum algae, initial concentration of nitrate ions (50-300 mg L -1 ), and contact duration on the nitrate removal process. The dried powder of S. polycystum algae was used in the experiment. The findings indicate that the seaweed S. polycystum has a high capacity to absorb nitrate ions from wastewater, with a maximum absorption capacity of 545.70 mg g -1 of seaweed. The optimal test conditions for nitrate removal were found to be pH of 6, initial biomass of 0.02 g L -1, initial concentration of 300 mg L -1 nitrate ions, and contact duration of 60 minutes. Under these conditions, the nitrate removal rate was 52.8%. The results of this study suggest that S. polycystum macroalgae has a high potential for removing nitrate ions from wastewater. Overall, the use of S. polycystum as a biosorbent for nitrate removal can offer a cost-effective, eco-friendly, and efficient solution for mitigating eutrophication. [ABSTRACT FROM AUTHOR]

Background: Recent studies suggest that individuals who underwent noncurative endoscopic resection for gastric cancer may require additional surgery. We conducted a comprehensive systematic review and meta-analysis to investigate the risk of lymph node metastasis in these cases. Methods: We comprehensively examined relevant literature by extensively reviewing electronic databases such as PubMed, Cochrane Library, and Google Scholar. Subsequently, we analyzed clinicopathological outcomes and calculated pooled odds ratios and 95 percent confidence intervals using diverse effects models. Results: This analysis included 12 papers with 4808 individuals who underwent additional surgery after noncurative endoscopic resection for early gastric cancer. The results indicated significant associations between lymph node metastasis and submucosal invasion (Odd ratio 2.04, 95% (CI): 1.58-2.63, I 2 = 88.7%; p<0.001), vertical margin (Odd ratio 6.11, 95% (CI): 1.94-19.23, I 2 = 0%; p<0.001), lymphatic invasion (Odd ratio 10.02, 95% (CI): 7.57-13.27, I 2 = 92%; p<0.000), and vascular invasion (Odd ratio 7.11, 95% (CI): 5.49-9.22, I 2=92%; p<0.000). Conclusion: When choosing factors for surgical treatment, it is essential to thoroughly consider the invasion of lymph nodes, vascular system, submucosa, and positive vertical margin. [ABSTRACT FROM AUTHOR]