| Texto completo | |
| Autor(es): |
dos Reis, Larissa Luiza
;
de Abreu, Cinthia Bruno
;
Gebara, Renan Castelhano
;
Rocha, Giseli Swerts
;
Longo, Elson
;
Mansano, Adrislaine da Silva
;
Melao, Maria da Graca Gama
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ECOTOXICOLOGY; v. 33, n. 1, p. 15-pg., 2024-01-18. |
| Resumo | |
Aquatic organisms are exposed to several compounds that occur in mixtures in the environment. Thus, it is important to investigate their impacts on organisms because these combined effects can be potentiated. Cobalt (Co) and nickel (Ni) are metals that occur in the environment and are used in human activities. To the best of our knowledge, there are no studies that investigated the combined effects of these metals on a freshwater Chlorophyceae. Therefore, this study analyzed the isolated and combined effects of Co and Ni in cell density, physiological and morphological parameters, reactive oxygen species (ROS), carbohydrates and photosynthetic parameters of the microalga Raphidocelis subcapitata. Data showed that Co affected the cell density from 0.25 mg Co L-1; the fluorescence of chlorophyll a (Chl( a)) (0.10 mg Co L-1); ROS production (0.50 mg Co L-1), total carbohydrates and efficiency of the oxygen evolving complex (OEC) at all tested concentrations; and the maximum quantum yield (phi(M)) from 0.50 mg Co L-1. Ni exposure decreased ROS and cell density (0.35 mg Ni L-1); altered Chl a fluorescence and carbohydrates at all tested concentrations; and did not alter photosynthetic parameters. Regarding the Co-Ni mixtures, our data best fitted the concentration addition (CA) model and dose-ratio dependent (DR) deviation in which synergism was observed at low doses of Co and high doses of Ni and antagonism occurred at high doses of Co and low doses of Ni. The combined metals affected ROS production, carbohydrates, phi(M), OEC and morphological and physiological parameters. (AU) | |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 18/07988-5 - Bioprospecção, caracterização e otimização de microalgas brasileiras para a biofixação de CO2 e produção de biomoléculas de importância comercial |
| Beneficiário: | Ana Teresa Lombardi |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 21/13583-0 - Efeitos Ecotoxicológicos de Nanopartículas de ZnWO4 e CuWO4 Sobre Uma Cadeia Alimentar Dulcícola: Aferindo Possíveis Impactos Ambientais de Contaminantes Emergentes |
| Beneficiário: | Renan Castelhano Gebara |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 21/13607-7 - Impactos ambientais das nanopartículas de CoWO4 e NiWO4 sobre níveis tróficos de uma cadeia alimentar aquática |
| Beneficiário: | Cínthia Bruno de Abreu |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |