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Interactions between contaminants and the trophic ecology of two seabirds in a coastal lagoon of the Gulf of California.
Ecotoxicology
January 2025
Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Mazatlán, Sinaloa, México.
Monitoring the dynamics of contaminants in ecosystems helps understand their potential effects. Seabirds have been used as biomonitors of marine ecosystems for this purpose. However, exposure and vulnerability to pollutants are understudied in tropical species, and the relationships between various pollutants and the trophic ecology of seabirds are poorly understood.
View Article and Find Full Text PDFPesticide exposure promotes disease activity by decreasing lymphoproliferative activity and increasing IL-4 production in systemic sclerosis patients.
Immunopharmacol Immunotoxicol
February 2025
Nursing Department, College of Nursing and Health Sciences, Jazan University, Jazan, Saudi Arabia.
Background: One of the common findings in systemic sclerosis (SSc) patients has been long-term exposure to environmental toxins such as pesticides. However, the data available shows an equivocal association between pesticide exposure and autoimmunity in SSc.
Methods: We investigated the levels of organochlorine pesticides (OCPs) in blood of 20 SSc patients and 17 healthy controls, and also studied their effect on T lymphocytes and their functional responses.
Association of Hepatic Gene Expression with Chemical Concentrations in Wild-Collected Double-Crested Cormorant Embryos using an EcoToxChip Gene Array.
Environ Sci Technol
January 2025
Environment and Climate Change Canada, Ecotoxicology and Wildlife Health Division, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada.
Contaminant monitoring programs use wild bird eggs, but determining whether measured concentrations elicit adverse effects relies on extrapolation from toxicity studies with avian model species. Here, we directly evaluated the relationships between whole embryo contaminant concentrations and mRNA expression in liver tissue of the double-crested cormorant (). Eggs collected from three North American sites (one from Lake Erie and two from the Salish Sea) were artificially incubated until pipping.
View Article and Find Full Text PDFEnhanced aerobic bioremediation of an aquifer heavily contaminated with a mixture of chlorobenzenes and hexachlorocyclohexanes at the Sardas landfill (Spain).
J Hazard Mater
November 2024
Departament d'Enginyeria Química, Biològica i Ambiental, Universitat Autònoma de Barcelona (UAB), Carrer de les Sitges s/n, Bellaterra, Spain.
The groundwater at the Sardas landfill in Huesca, Spain, is contaminated with benzene, chlorobenzenes, and hexachlorocyclohexane (HCH) isomers due to illegal waste dumping from a former lindane factory. In this study, microcosms using field-derived groundwater to evaluate in situ bioremediation were constructed. Anaerobic biostimulation with lactate successfully transformed α-, β-, δ-, and γ-HCH within two weeks, but failed to degrade benzene and less chlorinated benzenes, even with nutrient addition.
View Article and Find Full Text PDFFunctional profiling of the rhizospheric Exiguobacterium sp. for dimethoate degradation, PGPR activity, biofilm development, and ecotoxicological risk.
Sci Rep
November 2024
School of Biosciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, India.
Article Synopsis
- Researchers discovered an indigenous bacterial strain, Exiguobacterium sp. (L.O), from sugarcane fields in Tamil Nadu that can break down dimethoate, a pesticide, achieving a 95.87% degradation rate within 5 days.
- The strain utilized dimethoate as its only carbon source and released less toxic by-products, confirmed through gas chromatography-mass spectrometry (GC-MS) and FTIR analyses, indicating a clear metabolic breakdown pathway.
- In addition to its pesticide-degrading abilities, Exiguobacterium sp. (L.O) promotes plant growth by producing beneficial compounds, making it a promising candidate for sustainable agricultural practices and bioremediation efforts.
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