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Scanning Electron Microscopy and Metabolite Measurement Revealed the Stress Mechanism of PS-COOH Microplastics on Rhodotorula mucilaginosa AN5
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This study investigated the effects of carboxylated polystyrene nanoplastics (PS-COOH) on the Antarctic marine yeast Rhodotorula mucilaginosa AN5 using electron microscopy, growth assays, and metabolite analysis. Nanoplastics at certain concentrations inhibited growth by 40% and damaged cell morphology while triggering elevated antioxidant enzyme activity. This is a companion or earlier version of a related paper (ID 56165) reporting the same experimental work.
Microplastics in the marine environment have been paid more and more attention by researchers, and the impact of these substances on marine microorganisms can not be ignored. Studies have shown that PS-COOH Microplastics are harmful to marine molluscs, algae and monads. This study explore the effect and mechanism of microplastics (80 nm PS-COOH) on Antarctic marine yeast, Rhodotorula mucilaginosa AN5 by bacterial count, Scanning Electron Microscopy (SEM) and metabolite analysis. The results illustrates that a 50 mg/L concentration of PS-COOH could inhibit 36.15% growth of yeast cells and 10 mg/L inhibit 80.20%. Microplastics stress causes changes in the content of some oxidative stress substances, including reactive oxygen species (ROS) 42.86% , malondialdehyde (MDA) 54.06% content and the activities of antioxidant enzymes such as catalase (CAT) 36.00% , peroxidase (POD) 66.67% and superoxide dismutase (SOD) 25.40%. These results revealed the possible stress effect of microplastic pollution on marine yeast and may affect bottom layer of marine ecosystem.
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Scanning Electron Microscopy and Metabolite Measurement Revealed the Stress Mechanism of PS-COOH Microplastics on Rhodotorula mucilaginosa AN5
AI summary Read the abstract
Researchers exposed Antarctic marine yeast (Rhodotorula mucilaginosa AN5) to carboxylated polystyrene nanoplastics (PS-COOH) and found that even moderate concentrations inhibited cell growth and damaged cell structure. The yeast responded by increasing antioxidant enzyme activity to manage elevated reactive oxygen species caused by the plastic particles. This study provides early evidence that nanoplastics can harm marine microorganisms through oxidative stress mechanisms.
Scanning Electron Microscopy and Metabolite Measurement Revealed the Stress Mechanism of PS-COOH Microplastics on Rhodotorula mucilaginosa AN5
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This study used scanning electron microscopy and metabolite profiling to investigate how carboxylated polystyrene microplastics (PS-COOH) stress Antarctic marine yeast Rhodotorula mucilaginosa AN5. It found that microplastic exposure caused measurable cellular and metabolic disruption in this polar marine microorganism.
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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.
Nanoplastic-Induced Nanostructural, Nanomechanical, and Antioxidant Response of Marine Diatom Cylindrotheca closterium
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Both positively and negatively charged polystyrene nanoplastics inhibited the growth of the marine diatom Cylindrotheca closterium during short-term exposure (3-4 days) and altered its nanomechanical properties and antioxidant enzyme activity. Growth inhibition diminished during longer 14-day exposures, suggesting the diatom can partially acclimate to nanoplastic stress, possibly through extracellular polymer secretion.
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