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61,005 resultsShowing papers similar to The effects of two sized polystyrene nanoplastics on the growth, physiological functions, and toxin production of Alexandrium tamarense
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.
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.
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.
Size-dependent oxidative stress effect of nano/micro-scaled polystyrene on Karenia mikimotoi
This study exposed the harmful algal bloom species Karenia mikimotoi to polystyrene of three different sizes at two concentrations, finding that smaller nanoscale particles caused greater growth inhibition and oxidative stress than the 1 µm particles, with size-dependent effects varying over short and long exposures.
Effects of Nanoplastics on the Dinoflagellate Amphidinium carterae Hulburt from the Perspectives of Algal Growth, Oxidative Stress and Hemolysin Production
Polystyrene nanoplastics at 50 nm diameter inhibited growth, reduced chlorophyll content, elevated reactive oxygen species, and enhanced hemolysin production in the marine dinoflagellate Amphidinium carterae, suggesting that nanoplastic pollution could impair harmful algal bloom dynamics and broader marine food web function.
Are the primary characteristics of polystyrene nanoplastics responsible for toxicity and ad/absorption in the marine diatom Phaeodactylum tricornutum?
Researchers exposed the marine diatom Phaeodactylum tricornutum to 50 nm and 100 nm polystyrene nanoplastics and found that smaller particles triggered faster oxidative stress and photosynthetic damage while larger ones were more stable and caused greater growth inhibition over 72 hours, illustrating how particle size shapes toxicity dynamics in marine algae.
Effects of polystyrene nanoplastics on growth and hemolysin production of microalgae Karlodinium veneficum
Researchers exposed the harmful algal bloom species Karlodinium veneficum to polystyrene nanoplastics and found that high concentrations significantly inhibited algal growth and caused oxidative damage to cells. The nanoplastics disrupted cell morphology and weakened photosynthesis and energy metabolism in the algae. Notably, while growth was suppressed, the algae produced more hemolysin toxin, suggesting nanoplastic pollution could make harmful algal blooms more toxic.
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.
Polystyrene nanoplastics cause growth inhibition, morphological damage and physiological disturbance in the marine microalga Platymonas helgolandica
Researchers exposed marine green microalgae to polystyrene nanoplastics and found significant growth inhibition, increased membrane permeability, disrupted photosynthesis, and visible morphological damage — including surface fragmentation and cellular rupture — at concentrations as low as 200 µg/L.
Size-dependent toxic effects of polystyrene microplastic exposure on Microcystis aeruginosa growth and microcystin production
Researchers exposed the freshwater cyanobacterium Microcystis aeruginosa to polystyrene microplastics of two sizes and found that particle size significantly influenced the effects. The larger 1-micrometer particles promoted algal growth while aggregating on cell surfaces and inhibiting photosynthesis, whereas 100-nanometer particles stimulated toxin production. The study suggests that microplastic pollution in freshwater may have complex, size-dependent effects on harmful algal blooms and their toxin output.
Toxic effects of polystyrene nanoplastics on microalgae Chlorella vulgaris: Changes in biomass, photosynthetic pigments and morphology
This study tested how polystyrene nanoplastics of three different sizes affect green algae and found a clear pattern: smaller particles were more toxic than larger ones. The smallest nanoplastics (90 nm) caused the greatest reductions in algal growth and photosynthetic pigments, along with visible changes in cell shape and increased clumping. The findings suggest that as plastics break down into ever-smaller particles in the environment, their potential for biological harm may increase.
Microplastic size-dependent biochemical and molecular effects in alga Heterosigma akashiwo
Researchers investigated the effects of polystyrene micro- and nanoplastics on the harmful algal species Heterosigma akashiwo, finding that 80-nanometer particles were more toxic than 1-micrometer particles. The study showed that smaller nanoplastics at higher concentrations inhibited algal growth and photosynthesis, disrupted antioxidant enzyme activity, and altered gene expression, suggesting size-dependent toxicity mechanisms.
Effects of polystyrene microplastics on growth, physiological traits of Microcystis aeruginosa and microcystin production and release
Researchers examined how polystyrene microplastics of various sizes affect the growth and toxin production of the harmful algae Microcystis aeruginosa. They found that microplastics inhibited algal growth at low densities, with the smallest particles causing the greatest inhibition, and also disrupted the algae's antioxidant defense system. Notably, microplastic exposure led to a significant increase in the production of the toxin microcystin-LR, raising concerns about how microplastic pollution could worsen harmful algal blooms.
Microplastic-induced apoptosis and metabolism responses in marine Dinoflagellate, Karenia mikimotoi
Researchers found that micro- and nanoplastics of polystyrene and polymethyl methacrylate induced apoptosis and disrupted metabolism in the harmful algal bloom dinoflagellate Karenia mikimotoi, with effects varying by plastic size and polymer type.
Investigation of the toxic effects of different polystyrene micro-and nanoplastics on microalgae Chlorella vulgaris by analysis of cell viability, pigment content, oxidative stress and ultrastructural changes
Researchers examined the toxic effects of different-sized polystyrene micro- and nanoplastics on the microalga Chlorella vulgaris in long-term exposure tests. The study found that smaller particles (20 and 50 nm) caused greater reductions in cell viability and chlorophyll concentration than larger ones, with surface functionalization also influencing toxicity and ultrastructural damage.
Toxicity Effects of Polystyrene Nanoplastics with Different Sizes on Freshwater Microalgae Chlorella vulgaris
Researchers tested how two sizes of polystyrene nanoplastics (50 nm and 70 nm) affected the common freshwater microalgae Chlorella vulgaris. Both sizes reduced algae growth, chlorophyll content, and photosynthetic activity in a dose-dependent manner, with the smaller particles causing more damage. Since microalgae form the base of aquatic food chains, their sensitivity to nanoplastics could have cascading effects on entire freshwater ecosystems.
Size-Dependent Toxicityof Polystyrene Nanoplasticsto Tetrahymena thermophila: A Toxicokinetic–ToxicodynamicAssessment
Researchers synthesized polystyrene nanoplastics of four different sizes (50–500 nm) and exposed the ciliated protist Tetrahymena thermophila to each, finding that smaller particles were more toxic and caused greater bioaccumulation, confirming a size-dependent relationship between nanoplastic properties and ecotoxicological risk.
Micrometer scale polystyrene plastics of varying concentrations and particle sizes inhibit growth and upregulate microcystin-related gene expression in Microcystis aeruginosa
Researchers found that polystyrene microplastics inhibited the growth of the cyanobacterium Microcystis aeruginosa in a dose- and size-dependent manner, with smaller particles and higher concentrations causing greater growth suppression. Notably, microplastic exposure also upregulated genes related to microcystin production, suggesting that microplastics could potentially increase the toxicity of harmful algal blooms.
Microcystis aeruginosa copes with toxic effects of micro/nano-plastics with varying particle sizes through different self-regulatory mechanisms
Researchers exposed the freshwater cyanobacterium Microcystis aeruginosa to polystyrene particles of three different sizes ranging from nanoscale to microscale. All particle sizes harmed the algae, but they triggered different cellular defense mechanisms depending on their size, with nanoparticles causing the most severe damage. The findings reveal that particle size is a key factor in determining how microplastics affect aquatic microorganisms.
Response of coral reef dinoflagellates to nanoplastics under experimental conditions
Researchers exposed symbiotic dinoflagellates from coral reefs to polystyrene nanoplastics and found that cell growth and aggregation were significantly reduced after 10 days. The findings suggest that nanoplastic pollution could harm the tiny algae that are essential to coral reef health, with potential consequences for reef ecosystems.
Is hydrodynamic diameter the decisive factor? - Comparison of the toxic mechanism of nSiO2 and mPS on marine microalgae Heterosigma akashiwo
Researchers compared the toxic mechanisms of silica nanoparticles (nSiO2) and polystyrene microplastics (mPS) on the marine microalgae Heterosigma akashiwo over 96 hours, using growth inhibition tests to assess whether hydrodynamic diameter is the key determinant of toxicity. They found that particles with similar hydrodynamic diameters produced similar toxic mechanisms, suggesting particle size in solution is a more critical toxicity driver than material composition alone.
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.
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.
Nanoplastics promote microcystin synthesis and release from cyanobacterial Microcystis aeruginosa.
Researchers showed that amino-modified polystyrene nanoplastics (PS-NH2) stimulate microcystin synthesis and release in the bloom-forming cyanobacterium Microcystis aeruginosa by inhibiting photosystem II and increasing membrane permeability. This is the first direct evidence linking nanoplastics to enhanced cyanotoxin production in freshwater blooms.