Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/61289
Registo completo
Campo DC | Valor | Idioma |
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dc.contributor.author | Sousa, C. A. | por |
dc.contributor.author | Helena M. V. M. Soares | por |
dc.contributor.author | Soares, Eduardo V. | por |
dc.date.accessioned | 2019-09-02T15:25:28Z | - |
dc.date.available | 2019-09-02T15:25:28Z | - |
dc.date.issued | 2019-09 | - |
dc.identifier.citation | Sousa, C. A.; Helena M. V. M. Soares; Soares, Eduardo V., Chronic exposure of the freshwater alga Pseudokirchneriella subcapitata to five oxide nanoparticles: Hazard assessment and cytotoxicity mechanisms. Aquatic Toxicology, 214(105265), 2019 | por |
dc.identifier.issn | 1879-1514 | por |
dc.identifier.uri | https://hdl.handle.net/1822/61289 | - |
dc.description.abstract | The increasing use of nanoparticles (NPs) unavoidably enhances their unintended introduction into the aquatic systems, raising concerns about their nanosafety. This work aims to access the toxicity of five oxide NPs (Al2O3, Mn3O4, In2O3, SiO2 and SnO2) using the freshwater alga Pseudokirchneriella subcapitata as a primary producer of ecological relevance. These NPs, in OECD medium, were poorly soluble and unstable (displayed low zeta potential values and presented the tendency to agglomerate). Using the algal growth inhibition assay and taking into account the respective 72?h-EC50 values, it was possible to categorize the NPs as: toxic (Al2O3 and SnO2); harmful (Mn3O4 and SiO2) and non-toxic/non-classified (In2O3). It was observed that the toxic effects were mainly due to the NPs, except for SnO2 NPs, the toxicity of which can mainly be attributed to the Sn ions leached from the NPs. A mechanistic study was undertaken using different physiological endpoints (cell membrane integrity, metabolic activity, photosynthetic efficiency and intracellular ROS accumulation). It was observed that Al2O3, Mn3O4 and SiO2 induced an algistatic effect (growth inhibition without loss of membrane integrity) most likely as a consequence of the cumulative effect of adverse outcomes: reduction of the photosynthetic efficiency of the photosystem II (?PSII); ii) intracellular ROS accumulation and iii) loss of metabolic activity. SnO2 NPs also provoked an algistatic effect probably as a consequence of the reduction of ?PSII since no modification of intracellular ROS levels and metabolic activity were observed. Altogether, the results here presented allowed to categorize the toxicity of the five NPs and shed light on the mechanisms behind NPs toxicity in the green alga P. subcapitata. | por |
dc.description.sponsorship | This work was performed in the framework of the financing by Portuguese Foundation for Science and Technology (FCT) under the scope of the strategic funding of UID/BIO/04469/2019 unit and BioTecNorte operation (NORTE-01-0145-FEDER-000004) funded by the European Regional Development Fund under the scope of Norte2020—Programa Operacional Regional do Norte and LAQV (UID/ QUI/50006/2013—POCI/01/0145/FEDER/007265) with financial support from FCT/MEC through national funds and co-financed by FEDER, under the Partnership Agreement PT2020. | por |
dc.language.iso | eng | por |
dc.publisher | Elsevier 1 | por |
dc.relation | UID/BIO/04469/2019 | por |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147218/PT | por |
dc.rights | openAccess | por |
dc.subject | metabolic (esterase) activity | por |
dc.subject | microalga | por |
dc.subject | nanomaterials | por |
dc.subject | nanotoxicity | por |
dc.subject | oxidative stress | por |
dc.subject | photosynthesis | por |
dc.title | Chronic exposure of the freshwater alga Pseudokirchneriella subcapitata to five oxide nanoparticles: Hazard assessment and cytotoxicity mechanisms | por |
dc.type | article | - |
dc.peerreviewed | yes | por |
dc.relation.publisherversion | http://www.journals.elsevier.com/aquatic-toxicology/ | por |
dc.comments | CEB51888 | por |
oaire.citationVolume | 214 | por |
dc.date.updated | 2019-08-18T09:41:28Z | - |
dc.identifier.eissn | 0166-445X | por |
dc.identifier.doi | 10.1016/j.aquatox.2019.105265 | por |
dc.identifier.pmid | 31416018 | por |
dc.description.publicationversion | info:eu-repo/semantics/publishedVersion | - |
dc.subject.wos | Science & Technology | por |
sdum.journal | Aquatic Toxicology | por |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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document_51888_1.pdf | 1,32 MB | Adobe PDF | Ver/Abrir |