Project/scholarship details
- Project/scholarship ID
121650
- Reference
PTDC/AAC-AMB/121650/2010
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
5876-PPCDTI
- Funding amount
184,296.00 €
- Start date
2012-03-15
- End date
2015-09-14
Documents
Humic acids and nanoparticle size change the toxicity of nano CuO to freshwater...
Pradhan, Arunava; Geraldes, Paulo; Seena, Sahadevan; Pascoal, Cláudia; Cássio, FernandaIncreased commercial application of metal oxide nanoparticles increases the chance of their exposure to surface waters, generating a potential risk to biota and associated ecological processes. The probable threat however may depend on nanoparticle size and also the interactions with natural organic matter present in water, such as humic substances. In streams, microbes and invertebrate shredders are key player...
Effects of nano CuO on aquatic decomposers: from community to cellular responses
Pradhan, Arunava; Seena, Sahadevan; Helm, Stefan; Gerth, Katharina; Krauss, Gerd-Joachim; Wesenberg, Dirk; Schlosser, Dietmar; Pascoal, Cláudiantensive use of metal nanoparticles increases the chance of their release into freshwaters that may pose risk to biota and associated ecological processes. In streams, microbes play a key role in detritus foodwebs transferring carbon and energy from plant litter to invertebrate shredders. Here, we investigated the effects of nano CuO (<50 nm, nanopowder, Sigma) on aquatic detritus foodwebs by examining i) leaf-...
Responses of freshwater microbial decomposers to copper oxide nanoparticles
Pradhan, Arunava; Sahadevan, Seena; Helm, Stefan; Gerth, katharina; Schlosser, Dietmar; Krauss, Gerd-Joachim; Wesenberg, Dirk; Pascoal, CláudiaIntensive use of nano metals increases the chance of their release into natural watercourses and may pose at risk aquatic biota and their ecological functions. In streams, microbial decomposers, predominantly aquatic fungi, play a crucial role in organic matter turnover. We investigated the impact of nano CuO on stream-dwelling microbial decomposers of leaf litter by examining i) structure and functions of fung...
Polyhydroxyl fullerene can mitigate toxicity effects of cadmium on yeasts
Pradhan, Arunava; Sahadevan, Seena; Pascoal, Cláudia; Cássio, FernandaWith inception of nanotechnology, nanomaterials are currently in the prime-line of research. Polyhydroxyl fullerene is one of the widely commercialized nanomaterials and applied in electronics and biomedical fields. Unlike fullerene, polyhydroxyl fullerene is known to be biocompatible, and recent studies reported its antioxidant properties. On the other hand, cadmium toxicity has been often attributed to the ab...
Fungi from metal-polluted streams may have high ability to cope with the oxidat...
Pradhan, Arunava; Mundiyath, Seena Sahadevan; Schlosser, Dietmar; Gerth, Katharina; Helm, Stefan; Dobritzsch, Melanie; Krauss, Gerd-JoachimIncreased commercialization of products based on metal oxide nanoparticles increases the likelihood that these nanoparticles will be released into aquatic environments, thus making relevant the assessment of their potential impacts on aquatic biota. Aquatic fungi are distributed worldwide and play a key role in organic matter turnover in freshwater ecosystems. The present study investigated the impacts of coppe...
Natural organic matter alters size-dependent effects of nanoCuO on the feeding ...
Pradhan, Arunava; Geraldes, Paulo; Mundiyath, Seena Sahadevan; Pascoal, Cláudia; Cássio, FernandaNanoparticle size and the presence of natural organic matter (NOM) may influence the toxicity of nanoCuO to aquatic biota, but their interactive effects have been poorly investigated. We examined the feeding behaviour of the invertebrate shredder Allogamus ligonifer when exposed to sublethal concentrations of nanoCuO (50 and 100 mg L-1) with three particle sizes (12, 50 and 80 nm) in the absence or presence of ...
Humic acid can mitigate the toxicity of small copper oxide nanoparticles to mic...
Pradhan, Arunava; Geraldes, Paulo; Mundiyath, Seena Sahadevan; Pascoal, Cláudia; Cássio, FernandaAs the use of copper oxide nanoparticles (nanoCuO) in consumer products grows, aquatic ecosystems are likely to receive increasing amounts of these nanomaterials. Dissolved organic matter (DOM) may interact with nanoparticles and reduce their reactive surface area, which, in turn, can influence the impact of nanoCuO on organisms and ecological processes. We conducted a microcosm experiment to investigate the im...
Enzymatic biomarkers can portray nanoCuO-induced oxidative and neuronal stress ...
Pradhan, Arunava; Silva, Carla O.; Silva, Carlos J. R.; Pascoal, Cláudia; Cássio, FernandaSupplementary data associated with this article can be found, in the online version, at: http://dx.doi.org/10.1016/j.aquatox.2016.09.017; Commercial applications of nanometal oxides have increased concern about their release into natural waters and consequent risks to aquatic biota and the processes they drive. In forest streams, the invertebrate shredder Allogamus ligonifer plays a key role in detritus food we...
How do physicochemical properties influence the toxicity of silver nanoparticle...
Batista, Daniela; Pascoal, Cláudia; Cássio, FernandaAgNP physicochemical properties may affect AgNP toxicity, but their effects on plant litter decomposition and the species driving this key ecosystem process in freshwaters have been poorly investigated. We assessed the impacts of AgNPs with different size and surface coating (100 nm PVP (polyvinylpyrrolidone)-dispersant, 5060 nm and 35 nm uncoated) on freshwater decomposers of leaf litter by exposing leaf assoc...
Temperature modulates AgNP impacts on microbial decomposer activity
Batista, Daniela; Pascoal, Cláudia; Cássio, FernandaSilver nanoparticles (AgNP) scan have toxic effects on aquatic species and compromise important ecosystem processes. AgNP impacts have been the focus of much research, but their effects under different environmental contexts, such as the increase in global temperature are difficult to predict. The aim of this study was to evaluate the interactive effects of AgNPs and temperature on the activity and diversity of...
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