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61,005 resultsShowing papers similar to Sublethal Toxicity and Gene Expression Changes in Hydra vulgaris Exposed to Polyethylene and Polypropylene Nanoparticles
ClearSublethal Toxicity and Gene Expression Changes in Hydra vulgaris Exposed to Polyethylene and Polypropylene Nanoparticles
Researchers exposed the freshwater cnidarian Hydra vulgaris to polystyrene nanoplastics over an extended period, measuring sublethal toxicity endpoints and gene expression changes to understand the chronic effects of nanoplastic exposure on a simple but ecologically relevant aquatic animal.
Bioavailability and Effects of Polystyrene Nanoparticles in Hydra circumcincta
Lab experiments exposed the freshwater invertebrate Hydra to polystyrene nanoplastics (50 and 100 nm) at increasing concentrations for 96 hours. The hydra accumulated the particles and showed reduced regenerative capacity and body contractions at higher doses, demonstrating toxicity to a simple but important freshwater organism.
Polymethylmethacrylate nanoplastics effects on the freshwater cnidarian Hydra viridissima
Polymethylmethacrylate nanoplastics caused morphological damage and slowed regeneration in the freshwater organism Hydra viridissima, though feeding rates were not significantly affected at most concentrations. The results establish Hydra as a useful model for testing nanoplastic toxicity in freshwater ecosystems.
Sublethal impacts of fragmented polyethylene nanoplastics on Daphnia magna following chronic exposure
Researchers exposed Daphnia magna (water fleas) to fragmented polyethylene nanoplastics over a chronic period and observed adverse sublethal effects. The study suggests that even at concentrations that do not cause outright mortality, fragmented nanoplastics from real-world polyethylene degradation can impair the health and function of these important freshwater organisms.
Nanoplastics toxicity in aquatic organisms: a review of effects on selected marine and freshwater species
This review analyzed 128 studies on the effects of nanoplastics on five representative freshwater and marine species, including microalgae, bivalves, crustaceans, and fish. Researchers found that even low concentrations of nanoplastics can cause oxidative stress, membrane damage, developmental disorders, and immune and nervous system dysfunction. The study highlights that particle size, concentration, aging status, and the presence of co-contaminants all influence toxicity, and calls for more research at environmentally realistic exposure levels.
Nanoplastics toxicity in aquatic organisms: a review of effects on selected marine and freshwater species
This review synthesizes findings from 128 studies on the effects of nanoplastics on five representative freshwater and marine species, from microalgae to fish. Researchers found that even at low concentrations, nanoplastic exposure can cause oxidative stress, membrane damage, developmental disorders, and reproductive impairment across species. The study highlights significant knowledge gaps around chronic, environmentally realistic exposure levels and calls for standardized testing methods.
Effects of Nanoplastics on Aquatic Organisms
This review summarizes how nanoplastics — plastic particles smaller than 1 micrometer — affect aquatic organisms, highlighting their ability to penetrate cell membranes, accumulate inside organisms, and cause oxidative stress and reproductive harm.
Nanoplastics toxicity : microalgae and rotifers studies
This thesis investigated the toxicity of nanoplastics — plastic particles smaller than 100 nm — on microalgae and rotifers, two key components of aquatic food webs. The study found evidence of harm at concentrations that may be relevant to the environment, raising concerns about the ecological effects of nanoplastics as they accumulate in the ocean.
Toxicity of nanoplastics to aquatic organisms: Genotoxicity, cytotoxicity, individual level and beyond individual level
This review examines the toxic effects of nanoplastics on aquatic organisms across multiple levels of the food chain, from bacteria and algae to fish. Researchers found that nanoplastics can cause cell damage, genetic harm, and reproductive problems, with toxicity influenced by particle size, concentration, and surface properties. The study also highlights how nanoplastic effects on individual organisms can cascade to disrupt broader ecosystem dynamics.
The Effects of Polyethylene and Polypropylene Microplastics on Daphnia dentifera
Researchers examined the effects of polyethylene and polypropylene microplastics on the body size, swim speed, and clonal growth rate of the freshwater crustacean Daphnia dentifera, assessing sublethal physiological and behavioural impacts of two common plastic polymer types.
Effects of polymeric nanoparticles on fish : a multiparametric approach
This study assessed the effects of polymeric nanoparticles on fish using multiple endpoints including growth, reproduction, and gene expression, finding significant biological effects even at low concentrations. The results support the conclusion that plastic nanoparticles pose risks to aquatic vertebrates and provide data relevant to understanding the safety of nanoparticle-containing consumer products.
Meta-analysis for systematic review of global micro/nano-plastics contamination versus various freshwater microalgae: Toxicological effect patterns, taxon-specific response, and potential eco-risks
A meta-analysis of 1,071 observations found that nanoplastics cause more severe cell membrane damage than microplastics, while microplastics more strongly inhibit photosynthesis in freshwater microalgae. Among polymer types, polyamide caused the highest growth inhibition, polystyrene induced the most toxin release, and diatoms were the most sensitive algal group while cyanobacteria showed exceptional resilience.
Continuum of size from microplastics to nanoplastics: effects on the estuarine bivalve Scrobicularia plana at different levels of biological organization.
Researchers exposed the estuarine bivalve Scrobicularia plana to environmental microplastics and nanoplastics at low concentrations (0.008-100 ug/L), along with standard polystyrene nanoplastics, finding ecotoxicological effects on gills and digestive gland tissues at multiple levels of biological organisation.
Sub-lethal effects of nanoplastics upon chronic exposure to Daphnia magna
Researchers exposed Daphnia magna to nanoplastics for 21 days and found that 20 nm particles at 50 mg/L caused significant sublethal effects including reduced reproduction and altered growth, while 200 nm particles at the same mass concentration had less impact.
Teratogenic effects of environmental concentration of plastic particles on freshwater organisms
Researchers tested the effects of plastic particles at environmentally relevant concentrations on freshwater diatoms and hydra. They found significant developmental abnormalities in diatoms and reduced regeneration ability in hydra at concentrations as low as 0.1 micrograms per liter. The study highlights that even very low levels of plastic particle pollution can disrupt the growth and recovery of sensitive freshwater organisms.
Micro- and nanoplastic toxicity on aquatic life: Determining factors
This comprehensive review examined the key factors that determine the toxicity of micro- and nanoplastics to aquatic organisms. Researchers found that harmful effects depend on particle concentration, size, exposure time, shape, polymer type, and the species being exposed. The most commonly reported impacts included disrupted growth, oxidative stress, inflammation, immune system changes, and altered metabolism, with smaller particles generally causing more severe effects.
Toxicity of environmental and polystyrene plastic particles on the bivalve Corbicula fluminea: focus on the molecular responses
Researchers exposed freshwater bivalves to environmental microplastics and nanoplastics collected from a river, as well as to laboratory polystyrene nanoparticles, and measured molecular-level responses. Gene expression analysis revealed that plastic particle exposure activated stress response and immune defense pathways in gill and visceral tissues. The study indicates that even environmentally relevant concentrations of plastic particles can trigger measurable biological stress in filter-feeding organisms.
Continuum from microplastics to nanoplastics: effects of size and source on the estuarine bivalve Scrobicularia plana
Researchers exposed the estuarine bivalve Scrobicularia plana to environmentally realistic concentrations of both microplastics and nanoplastics to compare their toxic effects. The study found that particle size influenced toxicity profiles differently in gill and digestive gland tissues, suggesting that nanoplastics may pose distinct ecotoxicological risks compared to larger microplastic particles in estuarine organisms.
Sublethal effects induced by different plastic nano-sized particles in Daphnia magna at environmentally relevant concentrations
Researchers tested whether nanoplastics made from three different plastics — polystyrene, polyethylene, and polyvinyl chloride (PVC) — harm tiny water fleas called Daphnia magna at environmentally realistic concentrations, finding that PVC nanoplastics caused the most damage to both cellular health and swimming behavior. This suggests that studies focused only on polystyrene nanoplastics may be underestimating the true hazard of nanoplastic pollution.
Nanoplastics in Aquatic Environments: Impacts on Aquatic Species and Interactions with Environmental Factors and Pollutants
This review examines how nanoplastics affect aquatic species, focusing on their cellular and molecular toxicity as well as how environmental factors like temperature, salinity, and co-existing pollutants influence their harmful effects. Researchers found that nanoplastics can be absorbed more easily than larger plastic particles, transfer through food webs, and disrupt cellular function in aquatic organisms. The study highlights the need to consider real-world environmental conditions when assessing nanoplastic risks.
Evaluating sublethal effects of long-term exposure of Daphnia magna to nanoplastics at a low concentration
Lab experiments exposed Daphnia magna — a water flea that links primary producers to larger predators — to nanoplastics at low concentrations over multiple generations. The nanoplastics caused sublethal reproductive effects that became more pronounced over successive generations, suggesting that long-term, low-level nanoplastic exposure in the environment could gradually impair aquatic invertebrate population health.
Toxic effects of microplastic (polyethylene) exposure: Bioaccumulation, hematological parameters and antioxidant responses in crucian carp, Carassius carassius
Researchers exposed crucian carp to polyethylene microplastics at various concentrations and found that the particles accumulated in tissues including gills, gut, and liver. The microplastics altered blood cell counts and disrupted the fish's antioxidant defense system in a dose-dependent manner. The study suggests that even common polyethylene microplastics can cause measurable biological harm in freshwater fish.
Size fractionation of high-density polyethylene breakdown nanoplastics reveals different toxic response in Daphnia magna
Researchers found that mechanical breakdown of high-density polyethylene produces oxidized nanoplastics around 110 nm in diameter that are non-toxic to Daphnia magna at tested concentrations, but that an ultra-small fraction below approximately 3 nm is toxic, suggesting particle size is a critical determinant of nanoplastic toxicity.
Nanoplastic Affects Growth ofS. obliquusand Reproduction ofD. magna
Researchers tested the effects of nanoplastics on freshwater algae and tiny water fleas, two organisms at the base of aquatic food chains. They found that nano-polystyrene particles reduced algae growth through physical binding to cell surfaces and inhibited reproduction in water fleas at concentrations as low as 30 milligrams per liter. The study demonstrates that nanoplastics can harm freshwater organisms at multiple levels of the food web, even at relatively low concentrations.