Publications by authors named "Fernando de Campos Guerreiro"
Exposure to pesticides used in rice farming (bentazone, chlorantraniliprole and tebuconazole) affects biochemical biomarkers and hepatic histopathological parameters of hammertoad tadpoles (Boana faber).
Comp Biochem Physiol C Toxicol Pharmacol
September 2024
Article Synopsis
- Pesticides from rice farming can harm non-target organisms, impacting biodiversity, leading researchers to study their presence in river water and their effects on Boana faber tadpoles.
- The study found no major developmental issues in tadpoles but noted increased malondialdehyde (MDA) levels indicating oxidative stress after pesticide exposure, particularly with herbicide BTZ and fungicide TBZ.
- Histological examinations revealed significant changes in the tadpoles, such as inflammation and liver enzyme activity alterations, highlighting the negative impact of rice pesticides on local aquatic ecosystems and biodiversity.
Synthetic glucocorticoids are often found in surface waters and can cause harmful effects to aquatic organisms such as amphibians. In this work we evaluated the effects of the drugs prednisone (PD) and prednisolone (PL) on developmental, molecular, blood, biochemical and histological markers. Aquarana catesbeianus tadpoles were exposed for 16 days to environmentally relevant concentrations of 0, 0.
View Article and Find Full Text PDFIntegrating pollutant levels and biochemical biomarkers in oysters (Crassostrea rhizophorae and Crassostrea gasar) indicates anthropic impacts on marine environments along the coast of Santa Catarina state, Brazil.
Mar Environ Res
February 2024
This study aimed to carry out a general diagnosis of the contamination of the coastal marine environment of the Santa Catarina state (SC, Brazil) by different classes of environmental pollutants, as well as to evaluate possible adverse effects of the contaminants on biochemical biomarkers of oysters, Crassostrea gasar and Crassostrea rhizophorae. 107 chemicals were evaluated in water, sediment and oyster samples from nine sites along the coastline of SC. We also examined various biochemical biomarkers in the oysters' gills and digestive glands to assess potential effects of contaminants.
View Article and Find Full Text PDFIn this study the effects of environmentally realistic concentrations of the antibiotics sulfamethoxazole (SMX) and oxytetracyclyne (OTC) on Lithobates catesbeianus tadpoles were evaluated, through the analyzes of the frequencies of micronucleus and nuclear abnormalities in erythrocytes, alterations in leucocytes, liver histopathology, and changes in hepatic esterase activities and oxidative stress biomarkers. The animals were exposed for 16 days at concentrations of 0 (control), 20, 90 and 460 ng L. No significant difference was found in the frequencies of micronucleus and nuclear abnormalities.
View Article and Find Full Text PDF