Elimination of the hormesis phenomenon by the use of synthetic sea water in a toxicity test towards Aliivibrio fischeri

Drzymała, Justyna; Kalka, Joanna

doi:10.1016/j.chemosphere.2020.126085

Cited by 16 publications

(5 citation statements)

References 52 publications

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“…The highest concentration of NaCl (20% m/v) evaluated is comparable to sea water salinity. [69] As shown on Figure 6, the tensoactive properties of surfactin kept steady for different NaCl concentrations, exhibiting surface tension under 30 mN Á m À1 . Other authors reported a similar behaviour for surfactin resistance to salt concentration.…”

Section: Salt Stability Of Surfactin Producedmentioning

confidence: 82%

Production of surfactin by Bacillus subtilis LAMI005 and evaluation of its potential as tensoactive and emulsifier

et al. 2021

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In this study, the kinetic of lipopeptide biosurfactant production by Bacillus subtilis LAMI005 and its tensoactive and emulsifier properties were evaluated. The influence of the concentrations of nitrogen ((NH4)2SO4) and carbon source (glucose and fructose) on biosurfactant production, using a mineral medium, were evaluated. A production of about 930 mg · L−1 of surfactin was observed for mineral medium supplied with total reducing sugars (16.55 g · L−1) and (NH4)2SO4 (1 g · L−1) as carbon and nitrogen sources, respectively. The crude biosurfactant exhibited its potential as tensoactive, presenting the capability to reach surface tension of about 28 mN ⋅ m−1 for water and exhibiting low CMC (~14–20 mg · L−1). The analysis of emulsifying activity showed a greater stability of emulsion formed in motor oil (3.5 U), soybean oil (2.0 U), and biodiesel (1.5 U). The emulsion formulated on motor oil remained stable for more than 200 h, which was explained by its average drop diameter (~0–10 μm). The surface‐active properties of surfactin did not seem to be affected by different NaCl concentrations, which may promote its applicability in high salt environments, such as oil spills in marine areas.

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Section: Salt Stability Of Surfactin Producedmentioning

confidence: 82%

Production of surfactin by Bacillus subtilis LAMI005 and evaluation of its potential as tensoactive and emulsifier

et al. 2021

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“…Microelements present in municipal wastewater (MgCl 2 , Na 2 SO 4 , CaCl 2 or KCl) intensify the activity of microorganisms; therefore, a stimulatory response may be observed. The use of synthetic seawater eliminated the hormetic effect and increased bacterial sensitivity to the tested substances [38]. The composition of synthetic sea water is presented in Appendix A-Table A3.…”

Section: Toxicity Tests Towards Aquatic Organismsmentioning

confidence: 99%

“…[38];2 The toxicity data representing the most sensitive model organism determined the toxicity classification; (a) statistically significant differences between the wastewater influent and effluent in A. fischeri and L. minor tests (Student's t-test, α = 0.05); (b) statistically significant differences between the wastewater influent and effluent in D. magna tests (Mann-Whitney U test, p < 0.05).…”

mentioning

confidence: 99%

Towards Sustainable Wastewater Treatment: Bioindication as a Technique for Supporting Treatment Efficiency Assessment

Drzymała

Kalka

Sochacki

et al. 2022

IJERPH

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Constructed wetlands (CWs) are a promising alternative for conventional methods of wastewater treatment. However, the biggest challenge in wastewater treatment is the improvement of the technology used so that it is possible to remove micropollutants without additional costs. The impact of wastewater treatment in CWs on toxicity towards Aliivibrio fischeri, Daphnia magna and Lemna minor was investigated. The effects of feeding regime (wastewater fed in five batches per week at a batch volume of 1 L, or twice per week at a batch volume of 2.5 L) and the presence of pharmaceuticals (diclofenac and sulfamethoxazole), as well as the presence of Miscantus giganteus plants in CW columns (twelve of the 24 columns that were planted) were analyzed. A reduction in toxicity was observed in all experimental setups. The effluents from constructed wetlands were classified as moderately toxic (average TU for A. fischeri, D. magna and L. minor was 0.9, 2.5 and 5.5, respectively). The feeding regime of 5 days of feeding/2 days of resting resulted in a positive impact on the ecotoxicological and chemical parameters of wastewater (removal of TOC, N-NH4 and pharmaceuticals). Extended exposure of Miscantus giganteus to the wastewater containing pharmaceuticals resulted in elevated activity of antioxidant enzymes (catalase and superoxide dismutase) in leaf material.

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“…Also, some groups presented a high number of offspring produced by females, which may be associated with the stress caused by exposure to herbicides, where organisms direct their energy to reproduction, increasing the number of offspring (Moreira et al, 2020). Or it may be related to the hormesis effect, which corresponds to a stimulating or bene cial response at low concentrations and inhibitory or toxic at high concentrations, when organisms are exposed to toxic molecules (Drzymała, Kalka, 2020). This effect can be directly induced or occur due to homeostasis imbalance as a result of compensatory actions (Moreira et al, 2020).…”

Section: Effects On Reproduction On Daphnia Magnamentioning

confidence: 99%

Transgenerational Effects of Environmentally Relevant Concentrations of Atrazine and Glyphosate Herbicides, Isolated and in Mixture, to Freshwater Microcrustacean Daphnia Magna

Ramsdorf

Bordin

Munhoz

et al. 2021

Preprint

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Herbicide mixture is used as an alternative to obtain different mechanisms of action acting on weeds, resulting in the frequent presence of pesticides in environmental compartments. As they are products used worldwide, this study evaluated effects of environmentally relevant concentrations of the analytical standards and commercial formulations of the herbicides atrazine (2 µg L− 1) and glyphosate (65 µg L− 1), in isolation and also in mixture (2 + 65 µg L− 1) on the microcrustacean Daphnia magna. Through chronic exposure (21 days) of two generations of organisms, effects on survival and reproductive capacity were observed, as well as responses regarding oxidative stress, determined through the analysis of biochemical biomarkers such as catalase and glutathione S-transferase. In the evaluation of the first generation of test organisms, no significant results related to biochemical biomarkers were observed, only effects over sexual maturation of organisms. However, in the second generation of exposed organisms, changes were observed in all parameters evaluated, with the mixture of herbicide active principles being the treatment responsible for more significant responses (p < 0.05). A statistical difference (p < 0.05) was also observed between analytical standards and commercial formulations, indicating that other components present in the formulations can change the toxicity of the products. Given the difficulty of estimating the effects of mixtures and considering that various stressors are found in the environment, our results support the need to carry out studies that address long-term effects and, above all, that verify what the impacts are across generations, so that the toxicity of products is not underestimated.

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Elimination of the hormesis phenomenon by the use of synthetic sea water in a toxicity test towards Aliivibrio fischeri

Cited by 16 publications

References 52 publications

Production of surfactin by Bacillus subtilis LAMI005 and evaluation of its potential as tensoactive and emulsifier

Production of surfactin by Bacillus subtilis LAMI005 and evaluation of its potential as tensoactive and emulsifier

Towards Sustainable Wastewater Treatment: Bioindication as a Technique for Supporting Treatment Efficiency Assessment

Transgenerational Effects of Environmentally Relevant Concentrations of Atrazine and Glyphosate Herbicides, Isolated and in Mixture, to Freshwater Microcrustacean Daphnia Magna

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