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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1111/jpy.12181
|2 doi
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|a pubmed24n0861.xml
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|a eng
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|a Herzi, Faouzi
|e verfasserin
|4 aut
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|a Three-dimensional (3-D) fluorescence spectroscopy analysis of the fluorescent dissolved organic matter released by the marine toxic dinoflagellate Alexandrium catenella exposed to metal stress by zinc or lead
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|c 2014
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|a Text
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 26.07.2016
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|a Date Revised 18.03.2016
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2014 Phycological Society of America.
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|a We investigated the effects of zinc or lead on growth and on exudation of fluorescent dissolved organic matter (FDOM) by the marine toxic dinoflagellate Alexandrium catenella (Whedon & Kofoid) Balech. The species was exposed to increasing free zinc (1.34 × 10(-7) M-3.98 × 10(-6) M) or lead (5.13 × 10(-9) M-1.82 × 10(-7) M) concentra-tions. Low metal levels ([Zn(2+) ] = 1.34 × 10(-7) M; [Pb(2+) ] = 5.13 × 10(-9) M) had no effect on cell growth. Toxic effects were observed from higher metal contamination ([Zn(2+) ] = 3.98 × 10(-6) M; [Pb(2+) ] = 6.54 × 10(-8) M), as a conversion of vegetative cells into cysts. Analysis of the released FDOM by three-dimensional (3-D) fluorescence spectroscopy was achieved, using the parallel factor analysis (PARAFAC). The PARAFAC modeling revealed four components associated with two contributions: one related to the biological activity; the other linked to the organic matter decomposition in the culture medium. The C1 component combined a tryptophan peak and characteristics of humic substances, whereas the C2 component was considered as a tryptophan protein fluorophore. The two others C3 and C4 components were associated with marine organic matter production. Relea-sed fluorescent substances were induced by low ([Zn(2+) ]= 1.34 × 10(-7) M; [Pb(2+) ] = 5.13 × 10(-9) M) and moderate ([Zn(2+) ] = 6.21 × 10(-7) M; [Pb(2+) ] = 2.64× 10(-9) M) metal concentrations, suggesting the activation of cellular mechanisms in response to metal stress, to exudate FDOM that could complex metal cations and reduce their toxicity toward A. catenella cells
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a 3-D fluorescence spectroscopy
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|a Alexandrium catenella
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|a PARAFAC
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|a exudation
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|a fluorescent dissolved organic matter
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|a trace metals
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|a Jean, Natacha
|e verfasserin
|4 aut
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|a Sakka Hlaili, Asma
|e verfasserin
|4 aut
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|a Mounier, Stéphane
|e verfasserin
|4 aut
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|i Enthalten in
|t Journal of phycology
|d 1966
|g 50(2014), 4 vom: 18. Aug., Seite 665-74
|w (DE-627)NLM098182994
|x 1529-8817
|7 nnns
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| 773 |
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|g volume:50
|g year:2014
|g number:4
|g day:18
|g month:08
|g pages:665-74
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|u http://dx.doi.org/10.1111/jpy.12181
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