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61,005 resultsShowing papers similar to The humic acid-like substances released from Microcystis aeruginosa contribute to defending against smaller-sized microplastics
ClearRoles of extracellular polymeric substances on Microcystis aeruginosa exposed to different sizes of polystyrene microplastics
Researchers examined how the cyanobacterium Microcystis aeruginosa responds to different sizes of polystyrene microplastics by producing extracellular polymeric substances. They found that the composition of these protective substances varied depending on particle size, with each size triggering distinct defense mechanisms in the algae. The study reveals that extracellular polymeric substances play a crucial role in mitigating the adverse effects of microplastics on algal growth and photosynthesis.
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.
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 Impacts on Microalgae Growth: Effects of Size and Humic Acid
Researchers investigated how different sizes of polystyrene microplastics affect the growth of freshwater microalgae, both with and without naturally occurring humic acid. They found that larger particles blocked light and disrupted photosynthesis, while smaller ones damaged cell walls by adhering to the algae surface. Adding humic acid significantly reduced the toxicity of smaller microplastics by forming a protective coating around the particles.
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.
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.
Extracellular polymers substances towards the toxicity effect of Microcystis flos-aquae under subjected to nanoplastic stress
Researchers studied how nanoplastics affect a common freshwater algae and found that the algae produce protective substances in response, but the plastic particles still significantly inhibited growth and disrupted photosynthesis. This matters because harmful algal blooms and water quality are affected by nanoplastic pollution, with downstream consequences for drinking water safety and aquatic food sources.
Responses of Microcystis aeruginosa to polystyrene microplastics: Growth dynamics and implications for water treatment
Researchers studied how polystyrene microplastics affect the harmful freshwater algae Microcystis aeruginosa, which causes toxic algal blooms. They found that while microplastics initially suppressed algae growth, the algae eventually adapted and grew even more, producing higher levels of the dangerous toxin microcystin. The study suggests that microplastic pollution in freshwater could worsen harmful algal blooms and create additional water treatment challenges.
Changes of the physicochemical properties of extracellular polymeric substances (EPS) from Microcystis aeruginosa in response to microplastics
This study examined how microplastics affect the extracellular polymeric substances produced by the common freshwater cyanobacterium Microcystis aeruginosa, which plays a role in harmful algal blooms. Researchers found that microplastic exposure altered the composition and structure of these substances over time. The findings suggest that microplastics could influence how cyanobacteria aggregate and form blooms, with potential implications for water quality management.
Nanoplastics Promote Microcystin Synthesis and Release from Cyanobacterial Microcystis aeruginosa
Researchers discovered that amino-modified polystyrene nanoplastics promote both the production and release of microcystin, a harmful toxin, from the cyanobacterium Microcystis aeruginosa. The nanoplastics inhibited photosynthesis, induced oxidative stress, and damaged cell membranes, which enhanced toxin synthesis and extracellular release. The findings suggest that nanoplastic pollution in freshwater ecosystems could worsen the threat of harmful algal blooms to aquatic ecology and human health.
Modifying luteolin’s algicidal effect on Microcystis by virgin and diversely-aged polystyrene microplastics: Unveiling novel mechanisms through microalgal adaptive strategies
Polystyrene microplastics at concentrations of 0.5-50 mg/L -- both fresh and aged -- weakened the ability of the natural algicide luteolin to suppress Microcystis cyanobacterial blooms by stimulating the algae to produce more protective exopolymers and form aggregates with the plastic particles.
Micro- and nanoplastic stress intensifies Microcystis aeruginosa physiology and toxin risks under environmentally relevant water chemistry conditions
Researchers exposed the cyanobacterium Microcystis aeruginosa to environmentally relevant concentrations of micro- and nanoplastics, finding both significantly enhanced algal biomass and microcystin toxin production, with nanoplastics additionally promoting extracellular toxin release.
Post-exposure recovery of Microcystis aeruginosa from nanoplastics stress: metabolic adaptation and damage resilience
Researchers exposed Microcystis aeruginosa cyanobacteria to polystyrene nanoplastics for 15 days, then transferred them to NP-free medium to study post-exposure recovery. Toxicity was concentration-dependent during exposure, and cells showed metabolic changes and only partial recovery after removal, suggesting persistent effects on cyanobacterial physiology.
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.
Preferential adsorption of medium molecular weight proteins in extracellular polymeric substance alleviates toxicity of small-sized microplastics to Skeletonema costatum
Scientists discovered that natural substances secreted by marine algae form a coating on microplastic surfaces that actually reduces the toxicity of the smallest particles. This coating, made of proteins and sugars, changed the surface properties of the microplastics and helped the algae grow better despite the pollution. The finding suggests that natural biological processes in the ocean may partially buffer the harmful effects of microplastics, though this protection may vary with particle size.
Responses of bloom-forming Microcystis aeruginosa to polystyrene microplastics exposure: Growth and photosynthesis
Researchers exposed bloom-forming blue-green algae (Microcystis aeruginosa) to polystyrene microplastics and found a complex pattern: high concentrations (50–100 mg/L) temporarily suppressed growth and photosynthesis in the middle of the experiment, but promoted growth at the beginning and end. This suggests microplastics could worsen harmful algal blooms in the long run, which is concerning because these blooms produce toxins that contaminate drinking water.
The effects and mechanisms of polystyrene and polymethyl methacrylate with different sizes and concentrations on Gymnodinium aeruginosum
Researchers exposed the microalga Gymnodinium aeruginosum to polystyrene and polymethyl methacrylate microplastics of different sizes and concentrations, finding that smaller particles and higher concentrations caused greater oxidative stress and growth inhibition. The study revealed that microplastics can physically adhere to and damage algal cell membranes, disrupting cellular structure and function.
Physiological responses of the microalga Isochrysis galbana exposed to polystyrene microplastics with different particle sizes
Researchers exposed the marine microalga Isochrysis galbana to polystyrene microplastics of three different sizes and found that smaller particles caused more severe damage. The smallest microplastics inhibited growth, reduced photosynthetic efficiency, and increased oxidative stress more than larger particles. The study highlights that particle size is a critical factor in determining how harmful microplastics are to the base of the marine food chain.
Polymer-specific toxicity of microplastics to Microcystis aeruginosa: Growth inhibition, physiological responses, and molecular mechanisms
Researchers exposed the cyanobacterium Microcystis aeruginosa to four polymer types over 12 days and found that all significantly inhibited growth, with PVC causing the greatest inhibition, and identified polymer-specific molecular mechanisms including oxidative stress and photosynthesis disruption.
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.
Metabolic impacts of polystyrene microplastics on the freshwater microalga Microcystis aeruginosa
Researchers used untargeted metabolomics to investigate how polystyrene microplastics of different sizes affect the freshwater cyanobacterium Microcystis aeruginosa at the metabolic level. They found that microplastic exposure disrupted lipid metabolism and amino acid biosynthesis pathways, with effects varying by particle size and concentration. The study reveals that microplastics can cause subtle but measurable biochemical changes in freshwater algae that may not be captured by standard ecotoxicology tests.
Nano-sized polystyrene plastics toxicity to microalgae Chlorella vulgaris: Toxicity mitigation using humic acid
Researchers exposed the green microalga Chlorella vulgaris to amino-functionalized polystyrene nanoplastics and found significant toxicity to biomass and chlorophyll, but adding humic acid — a natural organic matter component — substantially reduced toxicity by coating the nanoplastics' positively charged surfaces and preventing their electrostatic attraction to algal cell walls.
Growth inhibition, toxin production and oxidative stress caused by three microplastics in Microcystis aeruginosa
Researchers tested the effects of three common microplastic types, PVC, polystyrene, and polyethylene, on the growth and toxin production of the freshwater cyanobacterium Microcystis aeruginosa. They found that all three microplastics inhibited algal growth and triggered oxidative stress, with PVC causing the most severe effects. The study also revealed that microplastic exposure stimulated the production of microcystin toxins, suggesting that plastic pollution could worsen harmful algal bloom impacts in freshwater systems.
Nano- and microplastics trigger secretion of protein-rich extracellular polymeric substances from phytoplankton
Researchers exposed four marine phytoplankton species to polystyrene nano- and microplastics and found that the smallest particles (55 nm nanoplastics) caused the most stress, reducing cell survival and altering the composition of secreted extracellular substances. The stressed phytoplankton produced protein-rich exopolymeric substances that facilitated the formation of aggregates around the plastic particles. The study suggests that nanoplastic pollution can change how marine microorganisms interact with their environment, affecting both plastic fate and microbial ecology.