Aquatic organic matter: Classification and interaction with organic microcontaminants

Artifon, Vanda; Zanardi-Lamardo, Eliete; Fillmann, Gilberto

doi:10.1016/j.scitotenv.2018.08.385

Cited by 84 publications

(28 citation statements)

References 225 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, this was true for exposure to pollutant concentrations in the range of µg L -1 . This is because of the greater dispersion of PM 2.5 in DMSO, which increased the bioavailability of the particulate matter to the nematodes (Artifon et al, 2019). The main route of uptake of pollutants in C. elegans is through the alimentary system; the worms actively ingest particulates while feeding on bacteria.…”

Section: Effects Of Ambient Pm25 On Locomotion Behavior Of C Elegansmentioning

confidence: 99%

Fine Particulate Matter-induced Toxic Effects in an Animal Model of Caenorhabditis elegans

Chung

Tsai

Que

et al. 2019

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Research has been focused on the health hazards of ambient PM 2.5 related to humans. Many PM 2.5 toxicity assessments using in vitro studies have focused on PM 2.5 -bounded hazardous pollutants. However, PM 2.5 toxicity assessment by in vivo studies allow for better observation of the overall effects of PM 2.5 exposure on entire organisms, making in vivo PM 2.5 toxicity assessment relevant. The toxic effects of outdoor PM 2.5 , collected from

show abstract

Section: Effects Of Ambient Pm25 On Locomotion Behavior Of C Elegansmentioning

confidence: 99%

Fine Particulate Matter-induced Toxic Effects in an Animal Model of Caenorhabditis elegans

Chung

Tsai

Que

et al. 2019

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

show abstract

“…Unicellular organisms are the proper tools for studying biological responses in complex media. Microbiota of the aqueous media might be sensitive to the presence of humic substances (HS), products of natural decomposition of organic matter, which play a role of natural attenuators of environmental toxicity [ 4 , 5 , 6 , 7 , 8 ] due to their complexing and redox ability. The presence of phenolic and other redox-active functional groups in HS accounts for their capability of reducing toxic impacts of organic and inorganic oxidizers [ 9 , 10 , 11 ], similar to the redox activity of other natural phenolic compounds [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Humic Substances Mitigate the Impact of Tritium on Luminous Marine Bacteria. Involvement of Reactive Oxygen Species

Rozhko

Kolesnik

Badun

et al. 2020

IJMS

View full text Add to dashboard Cite

The paper studies the combined effects of beta-emitting radionuclide tritium and Humic Substances (HS) on the marine unicellular microorganism—luminous bacteria—under conditions of low-dose radiation exposures (<0.04 Gy). Tritium was used as a component of tritiated water. Bacterial luminescence intensity was considered as a tested physiological parameter. The bioluminescence response of the marine bacteria to tritium corresponded to the “hormesis” model: it included stages of bioluminescence inhibition and activation, as well as the absence of the effect. HS were shown to decrease the inhibition and activation effects of tritium, similar to those of americium-241, alpha-emitting radionuclide, studied earlier. Correlations between the bioluminescence intensity and the content of Reactive Oxygen Species (ROS) were found in the radioactive bacterial suspensions. The results demonstrate an important role of HS in natural processes in the regions of low radioactive contamination: HS can mitigate radiotoxic effects and adaptive response of microorganisms to low-dose radioactive exposures. The involvement of ROS in these processes was demonstrated.

show abstract

“…This is consistent with our findings; the initial DOC concentrations at Site BC1 were ~3-5 ppm higher than at Sites BBR and BC2 245 (Table 1). From a compositional viewpoint, high CDOM concentrations in aquatic environments may reduce the rate of photodegradation, as chromophoric structures can have a photo-shielding effect, thereby limiting the attenuation of light (Artifon et al, 2019;Mostofa et al, 2013a). Increased CDOM concentrations have also been found to be positively correlated with higher DOC photodegradation, however, as chromophoric structures can be broken down by solar radiation (Jones et al, 2016).…”

Section: Calculations 175mentioning

confidence: 99%

Unravelling Light and Microbial Activity as Drivers of Organic Matter Transformations in Tropical Headwater Rivers

Spray

Wagner

Bischoff

et al. 2021

Preprint

View full text Add to dashboard Cite

Abstract. Connecting tropical rainforests to larger rivers, tropical headwaters export large quantities of carbon and nutrients as dissolved organic matter (DOM), and are thus a key component of the global carbon cycle. This DOM transport is not passive, however; sunlight and microbial activity alter DOM concentrations and compositions, affecting riverine greenhouse gas emissions and downstream ecosystems. The effects of sunlight and microbial turnover/activity on DOM concentrations and compositions in tropical headwaters are currently poorly understood, but novel Size Exclusion Chromatography (SEC) techniques coupled to suitable detectors can for the first time quantify their influences. Here, we present in-situ incubation experiments from from headwaters of the Essequibo River, in the Iwokrama Rainforest, Guyana, where sunlight oxidised up to 9% of dissolved organic carbon (DOC) over 12 hours, at higher rates than in larger tropical rivers. DOM transformations occurred in both photo-sensitive and supposedly photo-resistant pools. Microbial activity had varying, less clear influences on DOC concentrations over the same time span; compositionally, this appeared to extend beyond known bio-labile components. Biopolymers were particularly reactive to both processes. We show sunlight has the greater potential to mineralise headwater DOM and thus potentially influence degassing. Our approach provides a future template to constrain DOM transformations along river networks, identify biogeochemical activity hotspots, and improve greenhouse gas emissions estimations under changing environmental conditions.

show abstract

Aquatic organic matter: Classification and interaction with organic microcontaminants

Cited by 84 publications

References 225 publications

Fine Particulate Matter-induced Toxic Effects in an Animal Model of Caenorhabditis elegans

Fine Particulate Matter-induced Toxic Effects in an Animal Model of Caenorhabditis elegans

Humic Substances Mitigate the Impact of Tritium on Luminous Marine Bacteria. Involvement of Reactive Oxygen Species

Unravelling Light and Microbial Activity as Drivers of Organic Matter Transformations in Tropical Headwater Rivers

Contact Info

Product

Resources

About