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Combined Effects of Polystyrene Nanoplastics and Lead on Chlorella Vulgaris Growth, Oxidative Stress, Antioxidant Capacity and Morphological Alterations

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Polymers

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Researchers found that amino-functionalized polystyrene nanoplastics and lead act synergistically to inhibit the growth of the microalga Chlorella vulgaris, with combined exposure producing greater reductions in chlorophyll, biomass, and cell size than either pollutant alone.

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Researchers exposed the freshwater alga Chlorella pyrenoidosa to polystyrene and PVC microplastics across three size ranges for 14 days, finding that smaller particles caused greater growth inhibition — up to 43% — and that algae responded by secreting extracellular polymers and forming aggregates to resist the particles.

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Nanoplastic exposure inhibits growth, photosynthetic pigment synthesis and oxidative enzymes in microalgae: A new threat to primary producers in aquatic environment

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Scientists found that tiny plastic particles (nanoplastics) can seriously harm microalgae, the tiny plants that form the base of the ocean's food chain, by slowing their growth by up to 42%, reducing their ability to photosynthesize, and triggering stress damage inside their cells. Since these algae are eaten by small creatures that are eaten by bigger fish (eventually including the seafood we eat), this damage could ripple up the food chain and disrupt entire aquatic ecosystems. While this study looked at algae rather than humans directly, it adds to growing evidence that nanoplastic pollution, now found

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