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61,005 resultsShowing papers similar to Functionalized nanoplastics alter physiology and toxin production in Alexandrium pacificum through surface charge effects
ClearThe Effecting Mechanisms of 100 nm Sized Polystyrene Nanoplastics on the Typical Coastal Alexandrium tamarense
Researchers examined the effects of 100-nanometer polystyrene nanoplastics on the harmful algal bloom species Alexandrium tamarense. They found that nanoplastic exposure inhibited algal growth and photosynthesis while increasing production of paralytic shellfish toxins and reactive oxygen species. The study suggests that nanoplastic pollution in coastal waters could worsen harmful algal bloom impacts by stressing toxin-producing algal species.
Unraveling the toxicity mechanisms of nanoplastics with various surface modifications on Skeletonema costatum: Cellular and molecular perspectives
Researchers examined how nanoplastics with different surface coatings affect a common marine microalga at both the cellular and molecular level. They found that surface modifications significantly influenced the toxicity of the particles, with some coatings causing greater damage to cell membranes and photosynthesis. The study highlights that the chemical surface properties of nanoplastics, not just their size, play a key role in determining their environmental impact.
Effects of nanoplastics on microalgae and their trophic transfer along the food chain: recent advances and perspectives
This review summarized evidence on how nanoplastics affect microalgae — including growth inhibition, oxidative stress, and altered photosynthesis — and examined trophic transfer of nanoplastics up the food chain, finding that toxicity depended on NP concentration, size, and surface charge.
Unravelling the toxicity mechanisms of polystyrene nanoplastics on physiological and transcriptomic responses of the marine dinoflagellate Alexandrium minutum
Researchers exposed the toxic marine dinoflagellate Alexandrium minutum to polystyrene nanoplastics at concentrations from 0.1 to 50 mg/L and measured physiological responses and toxin production. NP exposure inhibited growth and photosynthesis, altered gene expression, and changed the profile of paralytic shellfish toxins produced by the alga.
Uncovering the potential effect of microplastics on Alexandrium pacificum: From the perspective of cyst formation and toxin production
Microplastics were found to influence the growth and toxin production of Alexandrium (a harmful algal bloom species), with effects depending on plastic type and concentration. This raises concerns that microplastic pollution could alter the frequency or severity of harmful algal blooms in coastal waters.
Effects of Polystyrene Microplastics on Growth and Toxin Production of Alexandrium pacificum
Researchers exposed the paralytic shellfish toxin-producing dinoflagellate Alexandrium pacificum to polystyrene microplastics and found that MP presence stimulated growth and increased toxin production per cell at certain concentrations, raising concerns about microplastics amplifying harmful algal bloom toxicity.
Integrated multilevel investigation of photosynthesis revealed the algal response distinction to differentially charged nanoplastics
This study investigated how nanoplastics with different electrical charges affect algae, which form the base of aquatic food chains. Positively charged nanoplastics caused the most severe damage, disrupting photosynthesis and damaging cell structures, while neutral and negatively charged particles had milder or even stimulating effects at low levels. Since algae health directly affects the entire aquatic food web, this research helps explain how nanoplastic pollution could ripple through ecosystems and ultimately impact seafood safety.
Effects of functionalized nanoplastics on oxidative stress in the mussel Mytilus coruscus
Researchers exposed mussels to three types of nanoplastics with different surface modifications and found that amino-modified particles were the most toxic, strongly inhibiting key antioxidant enzymes in gill and mantle tissues. Different surface chemistries triggered distinct patterns of oxidative stress across tissues, with gills being the most sensitive organ. The study highlights that how nanoplastics are modified by environmental weathering can significantly change their toxicity to marine organisms.
Influence of Functional Group Modification on the Toxicity of Nanoplastics
This review examines how different functional group modifications on the surface of nanoplastics influence their toxicity to microorganisms, plants, animals, and human cells. Researchers found that surface charge and specific functional groups significantly alter how nanoplastics interact with biological systems, with positively charged particles generally showing greater toxicity. The study underscores that the surface chemistry of nanoplastics is a critical factor in determining their environmental and health risks.
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.
Toxicity effects of polystyrene nanoplastics and arsenite on Microcystis aeruginosa
Researchers studied how two types of polystyrene nanoplastics with different surface properties interact with arsenic to affect freshwater algae. They found that nanoplastics with a sulfonic acid surface modification caused more severe growth inhibition and metabolic disruption in the algae, while both types reduced arsenic uptake by the organisms. The study highlights that the specific surface chemistry of nanoplastics significantly influences their environmental toxicity.
Influence of differently functionalized polystyrene microplastics on the toxic effects of P25 TiO2 NPs towards marine algae Chlorella sp.
Differently functionalized polystyrene microplastics (plain, amino, carboxyl) were tested for their influence on the toxicity of TiO₂ nanoparticles to marine algae Chlorella sp., finding that microplastics altered TiO₂ aggregation behavior and modified its effective toxicity in a surface-chemistry-dependent manner. The study demonstrates that microplastic-nanoparticle interactions in marine environments can change the ecotoxicological outcome of either contaminant alone.
The effects of two sized polystyrene nanoplastics on the growth, physiological functions, and toxin production of Alexandrium tamarense
Polystyrene nanoplastics at two size ranges were found to inhibit growth and alter physiological functions of the harmful algal bloom dinoflagellate Alexandrium tamarense, with larger particles having stronger effects on toxin production and smaller particles causing more pronounced growth inhibition.
ROS meditated paralytic shellfish toxins production changes of Alexandrium tamarense caused by microplastic particles
Researchers investigated how polystyrene microplastics affect toxin production in Alexandrium tamarense, a harmful algal bloom-causing dinoflagellate. The study found that microplastic exposure triggered elevated reactive oxygen species levels, which in turn stimulated overproduction of paralytic shellfish toxins through enhanced biosynthesis pathways, providing the first evidence that microplastics can indirectly increase harmful algal toxin levels through oxidative stress mechanisms.
Role of heteroaggregation and internalization in the toxicity of differently sized and charged plastic nanoparticles to freshwater microalgae
Researchers investigated how the size and surface charge of polystyrene nanoparticles affect their toxicity to freshwater microalgae. The study found that smaller and positively charged nanoparticles showed greater heteroaggregation with algal cells and higher internalization rates, leading to more pronounced toxic effects including reduced photosynthetic activity.
Micro/nano-plastics and microalgae in aquatic environment: Influence factor, interaction, and molecular mechanisms.
This review examined the interactions between micro/nanoplastics and microalgae in aquatic environments, summarizing how plastic particle size, surface chemistry, and co-pollutants influence algal toxicity through oxidative stress, photosynthesis inhibition, and gene expression changes.
Do plastic particles affect microalgal photosynthesis and growth?
This study investigated whether polystyrene particles of different sizes and charges affect growth and photosynthesis in three marine microalgae species. The results showed that charged particles caused greater inhibition of algal growth at the lowest concentrations tested, suggesting that plastic particle charge and size influence their toxicity to primary producers at the base of marine food chains.
Long-term toxicity of surface-charged polystyrene nanoplastics to marine planktonic species Dunaliella tertiolecta and Artemia franciscana
Researchers conducted long-term toxicity tests of positively and negatively charged polystyrene nanoparticles on marine microalgae and brine shrimp, finding that surface chemistry was the decisive factor: cationic (amino-modified) nanoparticles caused algal growth inhibition and shrimp mortality at microgram-per-liter concentrations, while anionic (carboxylated) particles accumulated and transferred trophically without acute lethality.
Ecotoxicity of micro- and nanoplastics on aquatic algae: Facts, challenges, and future opportunities
This review provides a comprehensive assessment of how micro- and nanoplastics harm aquatic algae, which form the base of ocean and freshwater food chains. The toxic effects include reduced growth, oxidative stress, and disrupted photosynthesis, with nanoplastics generally causing more damage than larger particles. Since algae support the entire aquatic food web, their decline from plastic pollution could reduce the quality and safety of fish and shellfish consumed by people.
Influence of microplastics on the toxicity of chlorpyrifos and mercury on the marine microalgae Rhodomonas lens
Researchers examined how polyethylene microplastics influence the toxicity of chlorpyrifos and mercury to the marine microalga Rhodomonas lens, finding that microplastics can modify pollutant bioavailability and alter toxic effects depending on particle surface oxidation state.
Charge-dependent negative effects of polystyrene nanoplastics on Oryzias melastigma under ocean acidification conditions
This study tested the combined effects of differentially charged polystyrene nanoplastics and ocean acidification on the marine fish Oryzias melastigma, finding that surface charge significantly influenced both independent and interactive toxicity. Negatively charged particles were generally more harmful, with effects exacerbated under acidified conditions.
Effect of salinity and humic acid on the aggregation and toxicity of polystyrene nanoplastics with different functional groups and charges
Researchers showed that surface charge governs nanoplastic behavior in water — higher salinity caused negatively charged nanoplastics to aggregate while positively charged particles remained stable — and that humic acid (dissolved organic matter) alleviated toxicity to Daphnia, increasing survival from 15% to nearly 100% in some cases.
Quantitative structure-activity relationships for green algae growth inhibition by polymer particles
Researchers built mathematical models to predict how toxic different polymer particles are to green algae, finding that the electric charge and structural properties of a polymer determine how much it inhibits algal growth. The models revealed that positively charged polymers harm algae by disrupting their cell walls, while negatively charged ones act mainly by depleting nutrients — a distinction important for assessing the environmental risks of microplastics and polymer-based products.
Toxicity evaluation of nano-TiO2 in the presence of functionalized microplastics at two trophic levels: Algae and crustaceans
Researchers examined how different surface-functionalized polystyrene microplastics affect the toxicity of titanium dioxide nanoparticles across two trophic levels, using algae and brine shrimp. They found that aminated and plain microplastics enhanced nano-TiO2 toxicity to algae, while carboxylated microplastics reduced it. Direct aqueous exposure caused greater toxicity in brine shrimp than dietary exposure, suggesting that the route of exposure significantly influences combined contaminant effects.