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The impact of cation concentration on Microcystis (cyanobacteria) scum formation

Drugă, Bogdan and Buda, Doriana-Mădălina and Szekeres, Edina and Chiş, Ciprian and Chiş, Iuliana and Sicora, Cosmin (2019):
The impact of cation concentration on Microcystis (cyanobacteria) scum formation.
In: Scientific Reports, p. 3017, 9, (1), [Online-Edition: https://doi.org/10.1038/s41598-019-39619-yhttps://www.nature...],
[Article]

Abstract

Cyanobacterial scums at the surface of the lakes are potentially harmful phenomena with increasing occurrence in the last decades, and the causes that lead to their formation are still an unresolved issue. In order to better understand what triggers the scums, we investigated the effect of several Mg2+ and Ca2+ ion concentrations in promoting them in eight Microcystis aeruginosa strains. The possibility to prevent scum formation by using the ion chelator EDTA was also explored. We found that in some strains the cell aggregation takes place under lower ion source concentrations (20 mM MgSO4 or CaCl2), while in others this phenomenon does not occur even at 60 mM concentration. The scum formation correlated to the amount of extracellular polymeric substances (between 234 and 351 µg/cell). EDTA failed to prevent the scum formation in most strains, and in turn it caused cell lysis followed by the release of cellular content into the culture medium. We emphasize the relevance of these results for cyanobacterial scum formation in the environment and we also suggest that controlling the salinity of the medium (by manipulating the ion concentration) is a potentially efficient method for biomass harvesting in large ponds/tanks.

Item Type: Article
Erschienen: 2019
Creators: Drugă, Bogdan and Buda, Doriana-Mădălina and Szekeres, Edina and Chiş, Ciprian and Chiş, Iuliana and Sicora, Cosmin
Title: The impact of cation concentration on Microcystis (cyanobacteria) scum formation
Language: German
Abstract:

Cyanobacterial scums at the surface of the lakes are potentially harmful phenomena with increasing occurrence in the last decades, and the causes that lead to their formation are still an unresolved issue. In order to better understand what triggers the scums, we investigated the effect of several Mg2+ and Ca2+ ion concentrations in promoting them in eight Microcystis aeruginosa strains. The possibility to prevent scum formation by using the ion chelator EDTA was also explored. We found that in some strains the cell aggregation takes place under lower ion source concentrations (20 mM MgSO4 or CaCl2), while in others this phenomenon does not occur even at 60 mM concentration. The scum formation correlated to the amount of extracellular polymeric substances (between 234 and 351 µg/cell). EDTA failed to prevent the scum formation in most strains, and in turn it caused cell lysis followed by the release of cellular content into the culture medium. We emphasize the relevance of these results for cyanobacterial scum formation in the environment and we also suggest that controlling the salinity of the medium (by manipulating the ion concentration) is a potentially efficient method for biomass harvesting in large ponds/tanks.

Journal or Publication Title: Scientific Reports
Volume: 9
Number: 1
Divisions: 13 Department of Civil and Environmental Engineering Sciences
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR > Wastewater Engineering
Date Deposited: 17 Oct 2019 07:07
Official URL: https://doi.org/10.1038/s41598-019-39619-yhttps://www.nature...
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