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Large Dataset-Based Regression Model of Chemical Toxicity to Vibrio fischeri
Arch Environ Contam Toxicol. 2023 Jul 5. doi: 10.1007/s00244-023-01010-4. Online ahead of print.ABSTRACTFor the first time, a global regression quantitative structure-toxicity/activity relationship (QSTR/QSAR) model was developed for the toxicity of a large data set including 1236 chemicals towards Vibrio fischeri, by using random forest (RF) regression algorithm. The optimal RF model with RF parameters of mtry = 3, ntree = 150 and nodesize = 5 was based on 13 molecular descriptors. It can achieve accurate prediction for the toxicity of 99.1% of 1236 chemicals, and yield coefficients of determination R2 of 0.893 for 930 lo...
Source: Archives of Environmental Contamination and Toxicology - July 5, 2023 Category: Environmental Health Authors: Xinliang Yu Minghui He Limin Su Source Type: research

Green Kingfishers as Sentinel Species for Mercury Contamination in Amazon
We examined the concentrations of total mercury and methylmercury in different tissues of the green kingfisher, Chloroceryle americana collected from the Teles Pires and Juruena Rivers in the southern Brazilian Amazon. We also evaluated total mercury in small Characidae fish (potential C. americana food) in the same areas. The results indicate contamination of the birds with high concentrations, on average two-times higher in the green kingfishers from the Teles Pires River compared to the Juruena River; the same results were found for the fish specimens. Fifty-eight per cent of the feather samples from the Juruena River a...
Source: Archives of Environmental Contamination and Toxicology - June 24, 2023 Category: Environmental Health Authors: Edvagner Oliveira Aurea Regina Alves Ign ácio Wilkinson Lopes L ázaro Sergi D íez Jean Remy Davee Guimar ães Manoel Santos-Filho Source Type: research

Preliminary Study on the Role of Mangroves in Entrapping Microplastics in Tuticorin Coast of Gulf of Mannar, Southeast Coast of India
This study aimed to quantify the role of mangrove root systems in effectively entrapping MPs in the mangrove areas of Tuticorin and Punnakayal Estuary. It investigated the abundance, characteristics, and weathering patterns of MPs in different mangrove sediments. Sediment samples were collected from ten mangrove sites and two control sites without mangroves. Microplastics were extracted from mangrove sediments by density separation method, and then counted and categorized according to their shape, size, and colour. Microplastics were identified in all ten sampling sites. Punnakayal Estuary has a greater MPs concentration (...
Source: Archives of Environmental Contamination and Toxicology - June 7, 2023 Category: Environmental Health Authors: S Shelciya V Glen Esmeralda Jamila Patterson Source Type: research