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61,005 resultsShowing papers similar to Data acquired in laboratory experiments conducted to characterize Ag bioaccumulation kinetics in Daphnia magna after exposures to polystyrene microplastics and Ag nanoparticles
ClearA preliminary study of the interactions between microplastics and citrate-coated silver nanoparticles in aquatic environments
Researchers investigated interactions between citrate-coated silver nanoparticles and three types of microplastics, finding that polystyrene efficiently removed silver nanoparticles from solution via π-π interactions, while polyethylene and polypropylene showed no significant interaction. The study provides first evidence that plastic type governs the co-transport of nanoparticles with microplastics in aquatic environments.
Mechanistic Roles of Microplastics in the Phototransformation of Silver Ions in Aquatic Environments
This study found that polystyrene microplastics mediate the transformation of silver ions into silver nanoparticles (Ag0, Ag2O, Ag2S) under natural and UV light irradiation, acting as reactive surfaces that alter silver speciation and potentially increase its bioavailability in aquatic systems.
Accumulation kinetics of polystyrene nano- and microplastics in the waterflea Daphnia magna and trophic transfer to the mysid Limnomysis benedeni
Researchers investigated the accumulation kinetics of polystyrene particles ranging from 26 nm to 4800 nm in Daphnia magna and their subsequent transfer to the mysid Limnomysis benedeni. Smaller particles accumulated more efficiently in Daphnia, and trophic transfer to mysids was demonstrated, confirming that nano- and microplastics move through aquatic food chains with size-dependent efficiency.
Polystyrene microplastics sunlight-induce oxidative dissolution, chemical transformation and toxicity enhancement of silver nanoparticles
Researchers discovered that polystyrene microplastics can induce sunlight-driven oxidative dissolution and chemical transformation of silver nanoparticles, enhancing their toxicity and revealing important implications for how co-occurring pollutants interact in the environment.
Impacts of polystyrene microplastics on Daphnia magna: A laboratory and a mesocosm study
Laboratory tests and mesocosm experiments with Daphnia magna and polystyrene microplastics found that effects at high concentrations were more related to food dilution than direct toxicity, and population-level effects in mesocosms were minimal. The study emphasizes the importance of using realistic concentrations and multi-species systems to assess microplastic risks.
Mechanism of low concentrations of polystyrene microplastics influence the cytotoxicity of Ag ions to Escherichia coli
Low concentrations of polystyrene microplastics had minimal direct toxicity to E. coli but dynamically modulated the toxicity of silver ions, initially protecting bacteria by shielding cell membranes and later intensifying toxicity by promoting reactive oxygen species generation depending on the plastic's surface charge. The study highlights the complexity of predicting combined microplastic and metal toxicity in aquatic ecosystems.
Role of polystyrene microplastics in sunlight-mediated transformation of silver in aquatic environments: Mechanisms, kinetics and toxicity
Researchers investigated how UV-aged polystyrene microplastics mediate the transformation of silver in sunlit aquatic environments, finding that reactive oxygen species generated during MP photo-oxidation both reduced and re-oxidized silver, altering its speciation and toxicity to aquatic organisms.
Polystyrene Nanoplastic Behavior and Toxicity on Crustacean Daphnia magna: Media Composition, Size, and Surface Charge Effects
Researchers examined how size and surface charge of polystyrene nanoplastics (20-100 nm) affected their behavior and toxicity to Daphnia magna in different water media, finding that smaller particles and certain media compositions significantly increased toxicity and aggregation patterns.
Toxicological effects of microplastics and heavy metals on the Daphnia magna
Researchers studied how polystyrene microplastics of two sizes adsorb heavy metals and how their combined presence affects the water flea Daphnia magna. They found that smaller microplastics had higher adsorption capacity for metals, and the combined toxicity shifted from antagonistic to additive effects as microplastic concentrations increased. The study reveals that smaller microplastics pose a greater toxicological risk when combined with heavy metals in aquatic environments.
Assessment of intake and effect of microplastics and its combination with metals in experimental (Daphnia magna) and environmental conditions (freshwater fish)
Researchers assessed the intake and effects of microplastics and their combination with metals using Daphnia magna as an experimental model and freshwater fish under environmental conditions, investigating how microplastics adsorb and transport harmful metals in freshwater systems.
Polystyrene Nanoplastics as Carriers of Metals. Interactions of Polystyrene Nanoparticles with Silver Nanoparticles and Silver Nitrate, and Their Effects on Human Intestinal Caco-2 Cells
Researchers investigated whether polystyrene nanoplastics can act as carriers of silver contaminants, testing their interactions with silver nanoparticles and silver nitrate and their combined effects on human intestinal Caco-2 cells. The study found that nanoplastics can adsorb silver compounds and that the combined exposure increased toxicity compared to either contaminant alone, suggesting nanoplastics may enhance metal uptake in the human gut.
Antagonistic effect of polystyrene nanoplastics and sliver nanoparticles on Chlorella pyrenoidosa
Researchers tested antagonistic interactions between polystyrene nanoplastics and silver nanoparticles on the freshwater green alga Chlorella, finding that combined exposure produced less toxicity than either agent alone, suggesting that plastic particles can sequester silver nanoparticles and reduce their bioavailability.
Mechanistic Rolesof Microplastics in the Phototransformationof Silver Ions in Aquatic Environments
Researchers investigated the mechanistic role of polystyrene microplastics in the phototransformation of silver ions (Ag+) in aquatic environments, finding that Ag-based nanoparticles ranging from 21.0-177.0 nm formed from Ag+ in the presence of PS microplastics after both natural light and UV irradiation. Using single-particle ICP-MS (sp-ICP-MS), they revealed that microplastics act as a photoreductive substrate that accelerates silver ion conversion to nanoparticles, potentially altering silver toxicity and bioavailability in aquatic systems.
Polystyrene microplastics facilitate the biotoxicity and biomagnification of ZnO nanoparticles in the food chain from algae to daphnia
Researchers found that polystyrene microplastics enhanced the toxicity and biological accumulation of zinc oxide nanoparticles in an aquatic food chain from algae to water fleas. When both pollutants were present together, water fleas showed increased oxidative stress, higher heart rates, and greater zinc accumulation compared to exposure to either pollutant alone. The study demonstrates that microplastics can amplify the harmful effects of other nanoparticle contaminants as they move through the food chain.
Microplastic Fibers Increase Sublethal Effects of AgNP and AgNO3 in Daphnia magna by Changing Cellular Energy Allocation
PET microplastic fibers combined with silver nanoparticles or silver nitrate increased sublethal toxicity in Daphnia magna compared to each stressor alone, with combined exposure altering cellular energy allocation and suggesting synergistic effects.
Interactions of Ingested Polystyrene Microplastics with Heavy Metals (Cadmium or Silver) as Environmental Pollutants: A Comprehensive In Vivo Study Using Drosophila melanogaster
Researchers used Drosophila larvae to study polystyrene microplastic interactions with cadmium and silver, visualizing plastic passage through the intestinal barrier into hemolymph and finding that co-exposure to metals and microplastics produced synergistic toxic effects.
Organic matter reduces acute toxicity for Daphnia magna exposed to polystyrene nanoparticles
This study found that dissolved organic matter in water significantly reduced the acute toxicity of polystyrene nanoplastics to Daphnia magna water fleas. The research suggests that the real-world toxicity of nanoplastics in natural waters, where organic matter is abundant, may be lower than what controlled laboratory studies alone would predict.
Microplastics alleviate phytotoxicity of silver nanoparticles in Ottelia cordata submerged leaves
Researchers investigated the combined effects of silver nanoparticles and polystyrene microplastics on the aquatic plant Ottelia cordata, finding that microplastics actually alleviated the phytotoxicity of silver nanoparticles by reducing their bioavailability. The results highlight complex antagonistic interactions between co-occurring aquatic contaminants.
An environmental concentration of aged microplastics with adsorbed silver significantly affects aquatic organisms
Researchers studied how natural biofouling and aging in stream water changes the properties and toxicity of microplastic beads over four weeks. They found that aged microplastics absorbed significantly more silver than pristine ones and released it more intensely, especially in acidic conditions. The study suggests that as microplastics age in the environment, they become more effective at carrying and releasing pollutants, increasing their potential harm to aquatic organisms.
Weathered Microplastics Induce Silver Nanoparticle Formation
Researchers found that weathered polystyrene microplastics can photochemically reduce dissolved silver ions to metallic silver nanoparticles in both freshwater and sand matrices under solar irradiation, revealing a previously unknown mechanism by which microplastics alter the chemical speciation of co-occurring metal contaminants.
Acute toxicity of organic pesticides to Daphnia magna is unchanged by co-exposure to polystyrene microplastics
Daphnia magna were exposed to dimethoate (low log Kow) and deltamethrin (high log Kow) pesticides in the presence or absence of 1 μm polystyrene microplastics, and microplastics were found to have no effect on the acute toxicity of either pesticide. The study challenges the assumption that polystyrene MPs function as significant vectors altering pesticide bioavailability and toxicity to freshwater zooplankton.
Impact of polystyrene microplastics on Daphnia magna mortality and reproduction in relation to food availability
Researchers exposed the freshwater crustacean Daphnia magna to polystyrene microplastics under varying food availability conditions and found that microplastic impacts on mortality and reproduction were most severe when food was limited. The study suggests that the ecological effects of microplastics on zooplankton are strongly influenced by nutritional status, with food-stressed organisms being more vulnerable to particle ingestion.
Changes of the acute and chronic toxicity of three antimicrobial agents to Daphnia magna in the presence/absence of micro-polystyrene
Polystyrene microplastics alone caused chronic reproductive toxicity to Daphnia magna at low milligram-per-liter concentrations and worsened the reproductive harm caused by three antimicrobial compounds (triclosan, triclocarban, and methyl-triclosan) in a concentration-dependent manner. The findings suggest microplastics can amplify the chronic toxicity of co-occurring pollutants to aquatic invertebrates.
The effects of polystyrene microparticles on the environmental availability and bioavailability of As, Cd and Hg in soil for the land snail Cantareus aspersus
Researchers exposed land snails to soil contaminated with both polystyrene microplastics and toxic metals including arsenic, cadmium, and mercury. They found that while microplastics had limited effects on overall metal availability in soil, they did alter the speed and pattern of metal uptake into snail tissues. The study suggests that microplastics may subtly change how organisms absorb environmental contaminants, even when they do not dramatically change the total amount available.