Biotic and abiotic factors affect microcystin-LR concentrations in water/sediment interface

Santos, Allan Amorim; Rachid, Caio Tavora Coelho da Costa; Magalhães, Valéria Freitas de

doi:10.1016/j.micres.2020.126452

Cited by 29 publications

(10 citation statements)

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“…According to Tsuji et al (Tsuji et al, 1994), photocatalytic degradation of pigments is the main natural degradation pathway of MC-LR in water. The water temperature at 39°C contributed to the removal of dissolved MC-LR in the presence of sediment, thereby affecting adsorption and biodegradation (Santos et al, 2020). However, the MC-LR content in Huangpu River was found increasing with high temperature and strong light intensity in summer according to our study.…”

Section: Spatial and Temporal Distribution Of Mc-lr In The Huangpu Ri...contrasting

confidence: 55%

The monthly variation tendency of microcystin-LR levels in the Huangpu River (China) by applications of ELISA and HPLC

Hua

Chen

et al. 2022

Environ Sci Pollut Res

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In this study, the contents of microcystin-LR (MC-LR) of Microcystis aeruginosa cultures in the laboratory and natural water samples from the Huangpu River in different seasons were detected through enzymelinked immunosorbent assay (ELISA) and high-performance liquid chromatography (HPLC), respectively.Excellent correlation between the two methods was obtained (R 2 > 0.99). ELISA was a reliable and simple method with high reproducibility (coe cient of variation < 25%) and satisfactory recovery for the monitoring of low levels of MC-LR. MC-LR concentrations in Huangpu River varied with the seasonal variation,which peaked in August with the temperature over 30°C and then gradually declined with the decreasing temperature after August. The highest MC-LR concentration in the Huangpu River was below the WHO drinking water quality standard (1 ug/L). These results indicated that warm temperature accelerated the MC-LR synthesis and release, and it is necessary to regularly monitor the MC-LR levels, especially during the high algae period in summer. ELISA can be applied to detect the low levels of MC-LR in the eld without complex treatment, avoiding the samples from denaturation and degradation during the transportation. Hence, ELISA is a better alternative of HPLC when HPLC is unavailable, especially when rapid testing is required in routine MC-LR analysis.

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Section: Spatial and Temporal Distribution Of Mc-lr In The Huangpu Ri...contrasting

confidence: 55%

The monthly variation tendency of microcystin-LR levels in the Huangpu River (China) by applications of ELISA and HPLC

Hua

Chen

et al. 2022

Environ Sci Pollut Res

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“…Phylum Omnitrophota [originally candidate division OP3 (Obsidian Pool 3)] was first discovered in 16S rRNA gene libraries generated from a hot spring sediment at the Yellowstone National Park ( Hugenholtz et al, 1998 ). Further Omnitrophota sequences were detected in anoxic environments such as terrestrial subsurface fluids, flooded paddy soils, marine sediments, lagoon sediments, hypersaline deep sea waters, freshwater lakes, aquifers, methanogenic bioreactors, and acidic peatland soils ( Derakshani et al, 2001 ; Glöckner et al, 2010 ; Rinke et al, 2013 ; Dombrowski et al, 2017 ; Momper et al, 2017 ; Lin et al, 2020 ; Santos et al, 2020 ). Phylogenetically, Omnitrophota has been assigned to the “Planctomycetes-Verrucomicrobia-Chlamydiae” superphylum based on 16S rRNA analysis ( Wagner and Horn, 2006 ; Pilhofer et al, 2008 ; Glöckner et al, 2010 ), which was confirmed using metagenome-based analysis ( Rinke et al, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Shedding Light on Microbial “Dark Matter”: Insights Into Novel Cloacimonadota and Omnitrophota From an Antarctic Lake

et al. 2021

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The potential metabolism and ecological roles of many microbial taxa remain unknown because insufficient genomic data are available to assess their functional potential. Two such microbial “dark matter” taxa are the Candidatus bacterial phyla Cloacimonadota and Omnitrophota, both of which have been identified in global anoxic environments, including (but not limited to) organic-carbon-rich lakes. Using 24 metagenome-assembled genomes (MAGs) obtained from an Antarctic lake (Ace Lake, Vestfold Hills), novel lineages and novel metabolic traits were identified for both phyla. The Cloacimonadota MAGs exhibited a capacity for carbon fixation using the reverse tricarboxylic acid cycle driven by oxidation of hydrogen and sulfur. Certain Cloacimonadota MAGs encoded proteins that possess dockerin and cohesin domains, which is consistent with the assembly of extracellular cellulosome-like structures that are used for degradation of polypeptides and polysaccharides. The Omnitrophota MAGs represented phylogenetically diverse taxa that were predicted to possess a strong biosynthetic capacity for amino acids, nucleosides, fatty acids, and essential cofactors. All of the Omnitrophota were inferred to be obligate fermentative heterotrophs that utilize a relatively narrow range of organic compounds, have an incomplete tricarboxylic acid cycle, and possess a single hydrogenase gene important for achieving redox balance in the cell. We reason that both Cloacimonadota and Omnitrophota form metabolic interactions with hydrogen-consuming partners (methanogens and Desulfobacterota, respectively) and, therefore, occupy specific niches in Ace Lake.

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“…Overall, Wu et al [101], Thirumavalavan et al [139], and Munusamy et al [140] showed that silty and clay textures of the samples containing a significant amount of organic matter potentiated MCs' adsorption. Moreover, the sorption of MCs onto the complex clay-organic matter may facilitate the anoxic and aerobic biodegradation of MCs [141].…”

Section: Microcystin Immobilization Onto Soil Particlesmentioning

confidence: 99%

“…Figure 2 shows a basic diagram of a horizontal flow MSL system with a single secondary treatment tank, based on a specific combination of material capable of performing the treatment to remove cyanobacterial toxicity. Studies have shown that due to their chemical constitution, clays such as montmorillonite [121,135,140,141], kaolinite, smectite, and illite [126,137] interact electrostatically with MCs, allowing the adsorption and trapping of these molecules on the surface of the clay particles. In the laboratory, different components, such as charcoal [96], pumice [17,160], and clay soil [127,129,140] have been used individually to remove cyanotoxins from water and have shown promising results.…”

Section: Multi-soil-layering (Msl) Technologymentioning

confidence: 99%

Multi-Soil-Layering Technology: A New Approach to Remove Microcystis aeruginosa and Microcystins from Water

Mugani

Prisca

Hejjaj

et al. 2022

Water

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Eutrophication of surface waters caused by toxic cyanobacteria such as Microcystis aeruginosa leads to the release of secondary metabolites called Microcystins (MCs), which are heptapeptides with adverse effects on soil microbiota, plants, animals, and human health. Therefore, to avoid succumbing to the negative effects of these cyanotoxins, various remediation approaches have been considered. These techniques involve expensive physico-chemical processes because of the specialized equipment and facilities required. Thus, implementing eco-technologies capable of handling this problem has become necessary. Indeed, multi-soil-layering (MSL) technology can essentially meet this requirement. This system requires little space, needs simple maintenance, and has energy-free operation and high durability (20 years). The performance of the system is such that it can remove 1.16 to 4.47 log10 units of fecal contamination from the water, 98% of suspended solids (SS), 92% of biological oxygen demand (BOD), 98% of chemical oxygen demand (COD), 92% of total nitrogen (TN), and 100% of total phosphorus (TP). The only reported use of the system to remove cyanotoxins has shown a 99% removal rate of MC-LR. However, the mechanisms involved in removing this toxin from the water are not fully understood. This paper proposes reviewing the principal methods employed in conventional water treatment and other technologies to eliminate MCs from the water. We also describe the principles of operation of MSL systems and compare the performance of this technology with others, highlighting some advantages of this technology in removing MCs. Overall, the combination of multiple processes (physico-chemical and biological) makes MSL technology a good choice of cyanobacterial contamination treatment system that is applicable in real-life conditions, especially in rural areas.

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Biotic and abiotic factors affect microcystin-LR concentrations in water/sediment interface

Cited by 29 publications

References 50 publications

The monthly variation tendency of microcystin-LR levels in the Huangpu River (China) by applications of ELISA and HPLC

The monthly variation tendency of microcystin-LR levels in the Huangpu River (China) by applications of ELISA and HPLC

Shedding Light on Microbial “Dark Matter”: Insights Into Novel Cloacimonadota and Omnitrophota From an Antarctic Lake

Multi-Soil-Layering Technology: A New Approach to Remove Microcystis aeruginosa and Microcystins from Water

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