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61,005 resultsShowing papers similar to Effects of polystyrene nanoplastics on the physiological and biochemical characteristics of microalga Scenedesmus quadricauda
ClearEffects 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.
The impact of polystyrene nanoplastics (PSNPs) on physiological and biochemical parameters of the microalgae Spirulina platensis
Researchers exposed the microalgae Spirulina platensis to polystyrene nanoplastics at three concentrations over 20 days and found dose-dependent reductions in growth rate, dry weight, and photosynthetic pigments alongside increased oxidative stress markers, indicating nanoplastics impair algal physiology even at relatively low exposure levels.
Toxic Effects of Microplastics on Culture Scenedesmus quadricauda: Interactions between Microplastics and Algae
Researchers found that microplastics from multiple polymer types inhibit growth of the freshwater alga Scenedesmus quadricauda and induce oxidative stress, with toxicity varying by polymer type, particle size, and concentration.
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.
Determination of polyethylene microplastics toxicity by microalgae Scenedesmus sp.
This study investigated the toxicity of polyethylene microplastics on the freshwater microalgae Scenedesmus sp. Results showed that microplastics inhibited algal growth and photosynthesis, indicating potential harm to aquatic ecosystems.
Application of freshwater microalgae Scenedesmus sp. for determining the toxicity of polypropylene microplastic particles
Polypropylene microplastics were found to be toxic to the freshwater microalgae Scenedesmus sp. in a dose-dependent manner. Since microalgae form the base of aquatic food chains, their sensitivity to microplastic exposure has cascading implications for freshwater ecosystems.
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.
Effects of polyethylene terephthalate microplastics on cell growth, intracellular products and oxidative stress of Scenedesmus sp.
Researchers exposed freshwater microalgae to PET microplastics, a common plastic found in beverage bottles and textiles. Higher concentrations of PET particles significantly reduced algal growth and disrupted the cells' internal production of lipids, carbohydrates, and proteins. The study suggests that PET microplastic pollution in wastewater could harm the tiny organisms that form the foundation of aquatic food webs.
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.
Acute effects of nanoplastics and microplastics on periphytic biofilms depending on particle size, concentration and surface modification
Researchers tested the acute effects of polystyrene particles ranging from 100 nanometers to 9 micrometers on freshwater biofilms that are essential for nutrient cycling. They found that larger particles had negligible effects, but high concentrations of 100-nanometer particles significantly reduced chlorophyll content and enzyme activities related to carbon and nitrogen cycling. Positively charged nanoparticles were the most toxic, with the damage linked to oxidative stress from excess reactive oxygen species generation.
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.
Impact of Microplastics on Growth and Lipid Accumulation in Scenedesmus quadricauda
Researchers exposed the microalga Scenedesmus quadricauda to polyethylene, polystyrene, and polypropylene microplastics at 250 mg/L in four size fractions (50–500 µm) and found all MPs suppressed algal growth while increasing lipid accumulation. Polypropylene caused the strongest inhibitory effects and the highest lipid yield—especially at the smallest 50 µm size—suggesting MPs stress-drive lipid overproduction in microalgae.
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.
Polystyrene nanoplastics alter the ecotoxicological effects of diclofenac on freshwater microalgae Scenedesmus obliquus
Polystyrene nanoplastics were found to modify the ecotoxicological effects of the pharmaceutical diclofenac on freshwater microalgae Chlamydomonas reinhardtii, with the combined exposure producing effects different from either pollutant alone.
Ecotoxic Effects of Nano Plastic on Freshwater plankton (Scenedesmus obliquus and Daphnia magna)
Researchers tested whether nanoplastic polystyrene particles affect the growth of green algae and the reproduction of water fleas in the lab. They found growth inhibition in algae at high doses and reproductive effects in water fleas, with the route of exposure (dissolved in water versus eaten with food) significantly influencing the severity of effects.
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.
Micro/nanoplastic-induced stress in microalgae: Latest laboratory evidence and knowledge gaps
This review compiled laboratory evidence on how micro- and nanoplastics stress microalgae — the base of aquatic food webs — covering effects on photosynthesis, growth, oxidative stress, and toxin production. The authors identify key knowledge gaps including environmentally realistic concentrations and combined contaminant effects.
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.
Effects of different concentrations and particle sizes of microplastics on the full life history of freshwater Chlorella
Researchers investigated how polystyrene microplastics of different concentrations and particle sizes affect the complete life cycle of freshwater Chlorella algae. The study found that microplastics can inhibit algal growth by up to 68%, while also altering chlorophyll content and photosynthetic activity, indicating that microplastic pollution may pose significant risks to the base of aquatic food webs.
The Effect of Polyethylene Microplastics on Growth and Antioxydant Response of Oscillatoria Princeps and Chlorella Pyrenoidosa
Researchers exposed two freshwater algae species to polyethylene microplastics of different sizes and found that the particles disrupted photosynthesis and altered antioxidant enzyme activity. Smaller microplastics generally caused more pronounced effects, and the two species responded differently to the stress. The findings suggest that microplastic pollution in freshwater environments could impair the growth of organisms at the base of aquatic food webs.
Microplastics in wastewater treatment plants: Detection, occurrence and removal
Researchers investigated how polystyrene nanoplastics affect the marine microalga Chaetoceros neogracile and found that exposure reduced growth and photosynthetic activity. The nanoplastics physically attached to the algal cells and triggered oxidative stress, suggesting they can interfere with the base of the marine food web. The study raises concerns that nanoplastic pollution could have cascading effects on ocean ecosystems by harming the tiny organisms that produce much of the world's oxygen.
Mechanism of transport and toxicity response of Chlorella sorokiniana to polystyrene nanoplastics
Researchers studied how polystyrene nanoplastics are transported into freshwater algae cells and what toxic effects they cause. They found that the tiny plastic particles entered the cells through specific pathways and triggered oxidative stress, inhibiting algae growth. The study provides new insights into how nanoplastics disrupt the base of aquatic food chains by damaging microscopic organisms.
Influence of microplastics particle size on the toxicity of the microalgae Scenedesmus sp.
This study tested how particle size affects the toxicity of microplastics to freshwater microalgae (Scenedesmus sp.), finding that smaller particles were more toxic. The size-dependent toxicity of microplastics is important for risk assessment, as environmental samples contain particles of widely varying sizes.
Nanoplastics reshape lipid metabolism in marine microalgae with potential ecological consequence
Researchers exposed a marine microalga important to ocean ecosystems to nanoplastics and found significant disruptions to its lipid metabolism, reducing both biomass and lipid production. The nanoplastics altered the types of fats the algae produced, potentially affecting the nutritional value of these organisms for the marine food web. The findings suggest that nanoplastic pollution could have cascading ecological consequences by disrupting carbon cycling at the base of the food chain.