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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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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.
Abstract 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. This study aims to pay attention to the effect and mechanism of microplastics (80 nm PS-COOH) on Antarctic marine yeast, Rhodotorula mucilaginosa AN5. In our work, Scanning Electron Microscopy (SEM) was used to observe the morphology of yeast cells under microplastic stress, and metabolite analysis was used to explore the possible mechanism of yeast cell damage. The results showed that: (1) a certain concentration of PS-COOH could inhibit 40% growth of yeast cells and destroy the cell morphology. (2) Physiological and biochemical changes showed that under PS-COOH stress, the level of reactive oxygen species (ROS), malondialdehyde (MDA) content and the activities of antioxidant enzymes such as catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD) of R. mucilaginosa AN5 increased from 34–66%. It can be guessed that yeast can eliminate excess ROS in cells by the activity of oxidative kinases increased and maintain the balance of reactive oxygen species in cells.
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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
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.
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.
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