Methylmercury Effect and Distribution in Two Extremophile Microalgae Strains <i>Dunaliella salina</i> and <i>Coccomyxa onubensis</i> from Andalusia (Spain)

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dc.contributor.authorŠimanský, Samuelcs
dc.contributor.authorHolub, Jiřícs
dc.contributor.authorMárová, Ivanacs
dc.contributor.authorCuaresma, Maríacs
dc.contributor.authorGarbayo Nores, Inescs
dc.contributor.authorTorronteras, Rafaelcs
dc.contributor.authorVílchez, Carloscs
dc.contributor.authorGojkovic, Živancs
dc.coverage.issue3cs
dc.coverage.volume12cs
dc.date.accessioned2024-07-22T14:46:05Z
dc.date.available2024-07-22T14:46:05Z
dc.date.issued2024-02-21cs
dc.description.abstractThe main entrance point of highly toxic organic Hg forms, including methylmercury (MeHg), into the aquatic food web is phytoplankton, which is greatly represented by various natural microalgal species. Processes associated with MeHg fate in microalgae cells such as uptake, effects on cells and toxicity, Hg biotransformation, and intracellular stability are detrimental to the process of further biomagnification and, as a consequence, have great importance for human health. The study of MeHg uptake and distribution in cultures of marine halophile Dunaliella salina and freshwater acidophilic alga Coccomyxa onubensis demonstrated that most of the MeHg is imported inside the cell, while cell surface adhesion is insignificant. Almost all MeHg is removed from the culture medium after 72 h. Significant processes in rapid MeHg removal from liquid medium are its abiotic photodegradation and volatilization associated with algal enzymatic activity. The maximum intracellular accumulation for both species was in 80 nM MeHg-exposed cultures after 24 h of exposure for D. salina (from 27 to 34 mu g/gDW) and at 48 h for C. onubensis (up to 138 mu g/gDW). The different Hg intakes in these two strains could be explained by the lack of a rigid cell wall in D. salina and the higher chemical ability of MeHg to pass through complex cell wall structures in C. onubensis. Electron microscopy studies on the ultrastructure of both strains demonstrated obvious microvacuolization in the form of many very small vacuoles and partial cell membrane disruption in 80 nM MeHg-exposed cultures. Results further showed that Coccomyxa onubensis is a good candidate for MeHg-contaminated water reclamation due to its great robustness at nanomolar concentrations of MeHg coupled with its very high intake and almost complete Hg removal from liquid medium at the MeHg levels tested.en
dc.formattextcs
dc.format.extent18cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationMicroorganisms. 2024, vol. 12, issue 3, 18 p.en
dc.identifier.doi10.3390/microorganisms12030434cs
dc.identifier.issn2076-2607cs
dc.identifier.orcid0000-0002-0982-5696cs
dc.identifier.orcid0000-0002-2095-1837cs
dc.identifier.other188493cs
dc.identifier.researcheridA-6897-2016cs
dc.identifier.scopus6603465110cs
dc.identifier.urihttps://hdl.handle.net/11012/249342
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofMicroorganismscs
dc.relation.urihttps://www.mdpi.com/2076-2607/12/3/434cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2076-2607/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectmethylmercuryen
dc.subjectmicroalgaeen
dc.subjectmercury contaminationen
dc.subjectmercury toxicityen
dc.titleMethylmercury Effect and Distribution in Two Extremophile Microalgae Strains <i>Dunaliella salina</i> and <i>Coccomyxa onubensis</i> from Andalusia (Spain)en
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-188493en
sync.item.dbtypeVAVen
sync.item.insts2024.07.22 16:46:04en
sync.item.modts2024.07.22 16:13:34en
thesis.grantorVysoké učení technické v Brně. Fakulta chemická. Ústav chemie potravin a biotechnologiícs
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