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61,005 resultsShowing papers similar to Effects of polystyrene microplastics on the extracellular and intracellular dissolved organic matter released by Skeletonema costatum using a novel in situ method
ClearThe 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.
Toxic effects of pristine and aged polystyrene and their leachate on marine microalgae Skeletonema costatum
Researchers compared the toxic effects of pristine and aged polystyrene microplastics, as well as their chemical leachates, on the marine microalga Skeletonema costatum. The study found that aged microplastics and their leachates caused greater growth inhibition, reduced chlorophyll concentration, and triggered stronger oxidative stress responses than pristine particles, suggesting that environmental weathering increases the toxicity of plastic debris.
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.
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.
Investigating the Molecular Response of Skeletonema marinoi to Polyethylene Nano/Microplastics: Insights into Stress Genes, Inflammation, and Extracellular Polymeric Substance Production
Researchers exposed the marine diatom Skeletonema marinoi to polyethylene nano- and microplastics and found that, despite no significant effect on growth, the particles triggered oxidative stress responses, inflammatory-like gene expression, and activation of programmed cell death pathways. The study suggests that even when diatoms appear resilient on the surface, microplastics may cause subtle molecular disruptions that could affect bloom dynamics and carbon cycling in the ocean.
Polystyrene microplastics increase microbial release of marine Chromophoric Dissolved Organic Matter in microcosm experiments
Researchers found that polystyrene microplastics increased microbial release of chromophoric dissolved organic matter (CDOM) in marine microcosm experiments, suggesting that microplastics can alter microbial community dynamics and influence the optical properties and carbon cycling of marine waters.
Physiological responses and altered halocarbon production in Phaeodactylum tricornutum after exposure to polystyrene microplastics
Exposure to microplastics altered physiological responses and halocarbon production in the marine diatom Phaeodactylum tricornutum, with implications for oceanic emissions of ozone-depleting brominated substances.
Impact of polystyrene nanoparticles on marine diatom Skeletonema marinoi chain assemblages and consequences on their ecological role in marine ecosystems
Researchers exposed the marine diatom Skeletonema marinoi to polystyrene nanoparticles and observed increased oxidative stress, reduced chain length, and nanoplastic aggregation at the diatom's silica pores, raising concern that nanoplastic interference with diatom chain formation could impair the biological carbon pump that sequesters atmospheric CO2 in deep ocean sediments.
Persistence and Recovery of Polystyrene and Polymethyl Methacrylate Microplastic Toxicity on Diatoms
Researchers tested whether the toxic effects of polystyrene and polymethyl methacrylate microplastics on marine diatoms persist after the plastic particles are removed. They found that both types of microplastics inhibited algal growth, increased oxidative stress, and caused structural damage, with some effects lingering even after a recovery period. The study suggests that even temporary microplastic exposure can cause lasting harm to the tiny algae that produce nearly 40% of the ocean's oxygen.
Characterization of microplastic-derived dissolved organic matter in freshwater: Effects of light irradiation and polymer types
Researchers examined how different types of microplastics release dissolved organic matter into freshwater under light and dark conditions. They found that polypropylene released the most organic compounds after UV exposure, while protein-like substances were the main material released by most plastics in the dark. The study indicates that microplastics may have ongoing, long-term effects on water chemistry and microbial activity in natural water bodies.
Polystyrene microplastics facilitate formation of refractory dissolved organic matter and reduce CO2 emissions
Researchers found that polystyrene microplastics altered the composition and function of microbial communities in aquatic environments, promoting the formation of refractory dissolved organic matter that resists further breakdown. This shift in organic matter composition also led to reduced carbon dioxide emissions from the water system. The study suggests that microplastic pollution may have unexpected effects on aquatic carbon cycling by changing how organic matter is processed by microbes.
Polystyrene microplastics at environmentally realistic concentrations exacerbate diatom blooms caused by phosphorus pollution: Rethinking coastal eutrophication
Researchers found that polystyrene microplastics at environmentally realistic concentrations exacerbate diatom blooms caused by phosphorus pollution in coastal waters, suggesting that microplastics and eutrophication act synergistically to worsen algal bloom events. The findings challenge the assumption that coastal eutrophication is driven solely by nutrient enrichment and highlight microplastics as a cofactor in bloom dynamics.
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.
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.
Impact of polystyrene microplastics on the growth and photosynthetic efficiency of diatom Chaetoceros neogracile
Researchers found that polystyrene microplastics significantly reduced the growth and photosynthetic ability of the diatom Chaetoceros neogracile, an important part of the ocean food web. Higher concentrations of microplastics caused more damage, decreasing the algae's ability to produce energy from light. Since diatoms are a foundational food source in the ocean, this disruption could ripple through the food chain and ultimately affect the quality of seafood that reaches people's plates.
Reactive oxygen species mediated extracellular polymeric substances production assisting the recovery of Thalassiosira pseudonana from polystyrene micro and nanoplastics exposure
Researchers studied how a marine diatom (a type of tiny algae) recovers from exposure to polystyrene micro- and nanoplastics by producing a protective slime layer. The algae used reactive oxygen species as a signal to ramp up production of this protective coating, which then trapped and settled the plastic particles. While this shows algae have some natural defense against microplastics, the process also causes the plastics to sink to the ocean floor, potentially concentrating them in sediments where bottom-dwelling organisms and the food chain could be affected.
Effects of polystyrene microplastic on the growth and volatile halocarbons release of microalgae Phaeodactylum tricornutum
Researchers found that polystyrene microplastics inhibit the growth of the marine diatom Phaeodactylum tricornutum and significantly alter the release of volatile halocarbons, including trihalomethanes, raising concerns about microplastic impacts on oceanic climate-active trace gas production.
Polystyrene microplastics alter plankton community and enhance greenhouse gas emissions: A case study in the China coastal sea
Researchers demonstrated through ship-based and laboratory experiments that polystyrene microplastics suppress phytoplankton growth by up to 82 percent and increase dissolved organic carbon accumulation in coastal seawater. The microplastics restructured plankton communities and enhanced the production of brominated volatile halocarbons, which are ozone-depleting substances and greenhouse gases. The study suggests that microplastic pollution in coastal waters may have cascading effects on marine carbon cycling and atmospheric chemistry.
Molecular-level insights into the heterogeneous variations and dynamic formation mechanism of leached dissolved organic matter during the photoaging of polystyrene microplastics
Researchers investigated the molecular-level changes that occur when polystyrene microplastics break down under light exposure and release dissolved organic matter into water. They found that the released molecules were highly diverse and changed dynamically over the course of aging, with different chemical classes appearing at different stages. The study provides new insight into how degrading microplastics introduce complex mixtures of organic chemicals into aquatic environments.
Impact of extracellular polymeric substances from Skeletonema costatum on the combined toxicity of microplastics and antibiotics in estuarine environment
Researchers investigated how extracellular polymeric substances from the diatom Skeletonema costatum modified the combined toxicity of polypropylene and polyethylene microplastics with the antibiotic sulfamethazine, finding that the EPS layer provided partial protection against the joint pollutant stress.
Solar radiation stimulates release of semi-labile dissolved organic matter from microplastics
Researchers found that solar radiation causes microplastics to release dissolved organic matter into seawater, with low-density polyethylene releasing about five times more carbon per gram per day than polystyrene. The released organic compounds included nitrogen- and sulfur-containing molecules, and a portion overlapped with compounds found naturally in coastal waters. Incubation experiments showed that microbes could utilize 9-19% of this plastic-derived organic matter within 30 days, suggesting it becomes part of the marine carbon cycle.
Polystyrene Microplastics Induce Photosynthetic Impairment in Navicula sp. at Physiological and Transcriptomic Levels
Researchers exposed freshwater diatom algae to polystyrene microplastics and found significant damage to their photosynthetic capacity within 24 to 48 hours. The microplastics reduced chlorophyll content, damaged cell membranes, and triggered oxidative stress responses, with gene analysis revealing disruption of key pathways related to photosynthesis and carbon fixation. The findings suggest that microplastic pollution in freshwater environments could impair the ability of algae to produce oxygen and support aquatic food webs.
The effect of microplastics pollution in microalgal biomass production: A biochemical study
Scientists exposed the marine microalga Phaeodactylum tricornutum to polystyrene microplastics and found that both short- and long-term exposure at environmentally relevant concentrations disrupted biochemical composition including proteins, carbohydrates, and lipids.
Sizeand Structure-DependentMolecular FingerprintTransformation of Microplastic-Derived Dissolved Organic Matter inSunlit Seawater: Implication for Marine Carbon Cycles
Researchers investigated how the size and structure of microplastics influence the photochemical transformation of microplastic-derived dissolved organic matter in sunlit seawater, finding that inherent polymer properties shape the molecular fingerprint changes with implications for marine carbon cycling.