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61,005 resultsShowing papers similar to Toxic effects of pristine and aged polystyrene and their leachate on marine microalgae Skeletonema costatum
ClearAccelerated Weathering Increases the Release of Toxic Leachates from Microplastic Particles as Demonstrated through Altered Toxicity to the Green Algae Raphidocelis subcapitata
Researchers subjected polystyrene microplastics to accelerated weathering and tested the resulting leachates against green algae, finding that weathered particles released significantly more toxic compounds and caused greater inhibition of algal growth than pristine particles.
Oxidative stress and energy metabolic response of Isochrysis galbana induced by different types of pristine and aging microplastics and their leachates
Researchers compared how different types of pristine and aged microplastics affect a marine microalga used in aquaculture. Aged microplastics were more toxic than fresh ones, and the chemical compounds they released into the water caused greater oxidative stress and energy disruption in algal cells. The study suggests that as microplastics weather in the environment, they may become more harmful to the base of the marine food chain.
A new concept for the ecotoxicological assessment of plastics under consideration of aging processes
A new ecotoxicological assessment approach for plastic leachates derived from alternating UV and hydrolysis weathering found that polystyrene leachates produced measurable algae growth inhibition and that oxidized polymer degradation products may be more bioavailable and toxic than pristine particles.
The Impact of Microplastics on the Growth of Skeletonema Costatum
Researchers exposed the marine diatom Skeletonema costatum to polystyrene microplastics at 0.1 and 10 mg/L, finding that both concentrations initially stimulated cell growth and chlorophyll content but also elevated antioxidant enzyme activity, indicating a stress response even when growth appeared enhanced.
Ecotoxicological impact of virgin and environmental microplastics leachate on Chlorella vulgaris: Synergistic microbial-pollutant drivers cripple photosynthesis
Researchers compared the toxic effects of leachate from new versus environmentally weathered microplastics on a common green algae species. They found that weathered microplastics were up to 3.4 times more toxic, severely disrupting photosynthesis and introducing hundreds of bacterial species and pollutants that compounded the damage. The findings highlight that microplastics become significantly more dangerous as they age in the environment.
Seawater Accelerated the Aging of Polystyrene and Enhanced Its Toxic Effects on Caenorhabditis elegans
Researchers simulated the aging of polystyrene microplastics in seawater and found that the marine environment accelerated surface erosion, releasing smaller aged particles. When tested on the nematode C. elegans, the aged polystyrene caused greater reductions in movement, vitality, and reproduction compared to virgin particles, driven by increased oxidative stress. The findings suggest that microplastics become more toxic as they weather in ocean conditions.
Influences of different functional groups on the toxicity of pyrene derivatives to Skeletonema costatum: Interactive effects with polystyrene microplastics
Researchers examined how polystyrene microplastics modify the toxicity of pyrene and four pyrene derivatives to the marine diatom Skeletonema costatum, finding that functional groups on the pyrene molecule determined whether microplastics enhanced or reduced algal toxicity.
The aging of microplastics exacerbates the damage to photosynthetic performance and bioenergy production in microalgae (Chlorella pyrenoidosa)
Researchers found that aged microplastics are significantly more toxic to freshwater algae than new microplastics, inhibiting growth by up to 45% and causing greater damage to photosynthesis and energy production. Since algae form the base of aquatic food chains, this heightened toxicity from weathered microplastics could cascade through ecosystems and ultimately affect the safety of freshwater resources that humans depend on.
Toxic effects of microplastic on marine microalgae Skeletonema costatum: Interactions between microplastic and algae
Researchers found that micrometer-sized PVC microplastics significantly inhibit the growth and photosynthesis of the marine microalga Skeletonema costatum — reaching up to 39.7% growth inhibition — primarily through direct physical adsorption and aggregation between particles and algal cells rather than by shading effects alone.
Concentration dependent toxicity of microplastics to marine microalgae
Researchers exposed the marine microalga Chlorella sp. to polystyrene microplastics at concentrations of 10 and 50 mg/L, finding that even low concentrations inhibited growth and disrupted photosynthesis, while higher concentrations caused more pronounced oxidative stress.
Effects of polystyrene microplastics on the extracellular and intracellular dissolved organic matter released by Skeletonema costatum using a novel in situ method
Researchers studied how polystyrene microplastics affect the dissolved organic matter released by the marine diatom Skeletonema costatum. They found that microplastic exposure altered both the quantity and chemical composition of organic compounds released by the algae, which could in turn influence how other contaminants behave in seawater. The study reveals an indirect pathway through which microplastics may affect marine chemistry and pollutant cycling.
The effect of polystyrene plastics on the toxicity of triphenyltin to the marine diatom Skeletonema costatum—influence of plastic particle size
The presence of polystyrene particles of different sizes was found to modify the toxicity of triphenyltin (a toxic organotin compound) to the marine diatom Skeletonema costatum, with effects depending on whether the plastic particles increased or decreased the bioavailability of the chemical. The study illustrates how microplastics can alter the toxicity of co-occurring chemical pollutants to sensitive marine microalgae.
Understanding microplastic aging driven by photosensitization of algal extracellular polymeric substances
Researchers found that substances released by algae significantly speed up the breakdown of polystyrene microplastics under sunlight. The algal compounds generate reactive molecules that attack the plastic surface, creating smaller fragments and releasing dissolved organic matter. The findings are particularly relevant for understanding how microplastics degrade in waterways affected by algal blooms.
Microplastics leachate may play a more important role than microplastics in inhibiting microalga Chlorella vulgaris growth at cellular and molecular levels
Researchers found that chemical compounds leaching from aged microplastics may be more harmful to algae than the microplastic particles themselves. UV-weathered polyethylene and PVC released substances that inhibited algae growth, caused oxidative stress, and altered gene expression more severely than direct particle exposure. The study suggests that the chemicals released by degrading microplastics deserve more attention as a source of aquatic toxicity.
Effects of Polystyrene Microparticles on Growth and Physiological Metabolism of Microalgae Scendesmus obliquus
Researchers examined the toxic effects of polystyrene microparticles on the microalga Scenedesmus obliquus, finding that exposure inhibited growth and disrupted photosynthesis and antioxidant defense systems in a concentration-dependent manner.
Aging process does not necessarily enhance the toxicity of polystyrene microplastics to Microcystis aeruginosa
Researchers compared the properties and toxicity of pristine versus aged polystyrene microplastics of different sizes on the freshwater cyanobacterium Microcystis aeruginosa. The study found that the aging process does not necessarily increase microplastic toxicity, as aging induced changes in surface properties, functional groups, and zeta potential that could either enhance or reduce toxic effects depending on particle size.
Evaluating physiological responses of microalgae towards environmentally coexisting microplastics: A meta-analysis
A meta-analysis of 52 studies found that microplastics inhibit microalgal growth and photosynthesis and induce oxidative damage, though microalgae can recover over time. Cyanobacteria are more vulnerable than green algae, and the relative size of microplastics to algal cells governs the mechanism of impact, while aged versus pristine microplastics have opposite effects on extracellular polymeric substance and microcystin production.
Microplastics decrease the toxicity of sulfamethoxazole to marine algae (Skeletonema costatum) at the cellular and molecular levels
Researchers investigated the combined toxicity of the antibiotic sulfamethoxazole and five types of microplastics on the marine alga Skeletonema costatum. They found that certain microplastics actually decreased the toxicity of the antibiotic by adsorbing it, creating a protective "shelter" effect, though polystyrene combined with the antibiotic caused higher oxidative stress. The study suggests that microplastics can alter the bioavailability and toxicity of co-occurring pollutants in marine environments through adsorption interactions.
Toxicity of polystyrene microplastics in freshwater algae Scenedesmus obliquus: Effects of particle size and surface charge
Researchers investigated how polystyrene microplastics of different sizes and surface charges affect the freshwater algae Scenedesmus obliquus. The study found that smaller 1-micrometer particles caused greater oxidative stress, reduced photosynthetic effectiveness, and decreased membrane integrity compared to larger 12-micrometer particles, with effects being dose-dependent.
Inhibitory Effect of Combined Exposure to Copper Ions and Polystyrene Microplastics on the Growth of Skeletonema costatum
Researchers examined how copper ions and polystyrene microplastics individually and together affect the growth of the marine diatom Skeletonema costatum. The study found that microplastics can adsorb copper ions, temporarily reducing copper toxicity to algal cells, but over longer exposure periods the inhibitory effects of microplastics themselves counteracted that benefit.
Physiological and metabolic toxicity of polystyrene microplastics to Dunaliella salina
Researchers studied the physiological and metabolic effects of polystyrene microplastics on the marine microalga Dunaliella salina. They found that both pristine and aged microplastics inhibited growth, increased reactive oxygen species production by up to 2.2-fold, and caused significant membrane lipid damage. Metabolomic analysis revealed that the microplastics disrupted amino acid metabolism and energy transport pathways, ultimately inhibiting cell division.
Different effecting mechanisms of two sized polystyrene microplastics on microalgal oxidative stress and photosynthetic responses
Researchers found that 1 micrometer polystyrene microplastics caused more oxidative stress and cell death in marine diatoms, while 0.1 micrometer particles caused greater light shading and pigment decline, revealing distinct size-dependent toxicity mechanisms.
Effects of the Exposure of Aged Micro-Polyethylene Terephthalate on the Growth Status and Photosynthesis of Chlorella sp. UTEX1602
This study found that microplastics aged through UV exposure, strong acids, or strong alkalis were significantly more toxic to the freshwater microalga Chlorella than unaged microplastics, inhibiting growth and disrupting photosynthetic pigments. The results highlight that weathered microplastics in the environment — rather than pristine particles — pose the greater ecological risk to aquatic primary producers.
Differential physiological response of marine and freshwater microalgae to polystyrene microplastics
Researchers compared how polystyrene microplastics affect marine versus freshwater algae species and found that freshwater algae were more severely harmed. While both types showed reduced photosynthesis and increased stress responses, marine algae recovered better over time, possibly due to differences in their cell membranes and ability to handle oxidative damage. Since algae form the base of aquatic food chains, greater damage to freshwater species could have cascading effects on the ecosystems that supply human drinking water and freshwater fish.