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61,005 resultsShowing papers similar to Physiological and genetic responses of the benthic dinoflagellate Prorocentrum lima to polystyrene microplastics
ClearUnravelling the toxicity mechanisms of polystyrene nanoplastics on physiological and transcriptomic responses of the marine dinoflagellate Alexandrium minutum
Researchers exposed the toxic marine dinoflagellate Alexandrium minutum to polystyrene nanoplastics at concentrations from 0.1 to 50 mg/L and measured physiological responses and toxin production. NP exposure inhibited growth and photosynthesis, altered gene expression, and changed the profile of paralytic shellfish toxins produced by the alga.
Physiological and metabolic toxicity of polystyrene microplastics to Dunaliella salina
Researchers studied the physiological and metabolic effects of polystyrene microplastics on the marine microalga Dunaliella salina. They found that both pristine and aged microplastics inhibited growth, increased reactive oxygen species production by up to 2.2-fold, and caused significant membrane lipid damage. Metabolomic analysis revealed that the microplastics disrupted amino acid metabolism and energy transport pathways, ultimately inhibiting cell division.
Concentration dependent toxicity of microplastics to marine microalgae
Researchers exposed the marine microalga Chlorella sp. to polystyrene microplastics at concentrations of 10 and 50 mg/L, finding that even low concentrations inhibited growth and disrupted photosynthesis, while higher concentrations caused more pronounced oxidative stress.
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.
Effects of Polystyrene Microplastics on Growth and Toxin Production of Alexandrium pacificum
Researchers exposed the paralytic shellfish toxin-producing dinoflagellate Alexandrium pacificum to polystyrene microplastics and found that MP presence stimulated growth and increased toxin production per cell at certain concentrations, raising concerns about microplastics amplifying harmful algal bloom toxicity.
Micrometer scale polystyrene plastics of varying concentrations and particle sizes inhibit growth and upregulate microcystin-related gene expression in Microcystis aeruginosa
Researchers found that polystyrene microplastics inhibited the growth of the cyanobacterium Microcystis aeruginosa in a dose- and size-dependent manner, with smaller particles and higher concentrations causing greater growth suppression. Notably, microplastic exposure also upregulated genes related to microcystin production, suggesting that microplastics could potentially increase the toxicity of harmful algal blooms.
Effects of polystyrene microplastics on growth, physiological traits of Microcystis aeruginosa and microcystin production and release
Researchers examined how polystyrene microplastics of various sizes affect the growth and toxin production of the harmful algae Microcystis aeruginosa. They found that microplastics inhibited algal growth at low densities, with the smallest particles causing the greatest inhibition, and also disrupted the algae's antioxidant defense system. Notably, microplastic exposure led to a significant increase in the production of the toxin microcystin-LR, raising concerns about how microplastic pollution could worsen harmful algal blooms.
Responses of bloom-forming Microcystis aeruginosa to polystyrene microplastics exposure: Growth and photosynthesis
Researchers exposed bloom-forming blue-green algae (Microcystis aeruginosa) to polystyrene microplastics and found a complex pattern: high concentrations (50–100 mg/L) temporarily suppressed growth and photosynthesis in the middle of the experiment, but promoted growth at the beginning and end. This suggests microplastics could worsen harmful algal blooms in the long run, which is concerning because these blooms produce toxins that contaminate drinking water.
Interactive adverse effects of low-density polyethylene microplastics on marine microalga Chaetoceros calcitrans
Researchers examined the toxicological effects of low-density polyethylene microplastics on the marine microalga Chaetoceros calcitrans. They found concentration-dependent inhibition of algal growth up to 85 percent, along with reduced photosynthetic efficiency and significant oxidative stress responses. The microplastics physically adhered to algal cell walls, causing observable structural damage, suggesting that polyethylene microplastic pollution may pose serious risks to marine phytoplankton at the base of ocean food chains.
Responses of Microcystis aeruginosa to polystyrene microplastics: Growth dynamics and implications for water treatment
Researchers studied how polystyrene microplastics affect the harmful freshwater algae Microcystis aeruginosa, which causes toxic algal blooms. They found that while microplastics initially suppressed algae growth, the algae eventually adapted and grew even more, producing higher levels of the dangerous toxin microcystin. The study suggests that microplastic pollution in freshwater could worsen harmful algal blooms and create additional water treatment challenges.
Adverse effects of microplastics on the growth, photosynthesis, and astaxanthin synthesis of Haematococcus pluvialis
Researchers exposed the microalga Haematococcus pluvialis to polystyrene microplastics and found that while short-term contact briefly stimulated growth, longer exposure inhibited photosynthesis, caused oxidative stress, and impaired the organism's ability to produce astaxanthin, a valuable natural antioxidant. The findings highlight how microplastic pollution could disrupt both aquatic ecosystems and the commercial production of beneficial compounds from algae.
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.
Effects of polystyrene nanoplastics on growth and hemolysin production of microalgae Karlodinium veneficum
Researchers exposed the harmful algal bloom species Karlodinium veneficum to polystyrene nanoplastics and found that high concentrations significantly inhibited algal growth and caused oxidative damage to cells. The nanoplastics disrupted cell morphology and weakened photosynthesis and energy metabolism in the algae. Notably, while growth was suppressed, the algae produced more hemolysin toxin, suggesting nanoplastic pollution could make harmful algal blooms more toxic.
Microplastics impacts in seven flagellate microalgae: Role of size and cell wall
Seven marine flagellate microalgae species were incubated with 1-micrometer polystyrene microplastics at 10 mg/L, revealing that cell size and the presence of a cell wall strongly influenced the degree of microplastic-induced physiological and growth effects across species.
Microplastic size-dependent biochemical and molecular effects in alga Heterosigma akashiwo
Researchers investigated the effects of polystyrene micro- and nanoplastics on the harmful algal species Heterosigma akashiwo, finding that 80-nanometer particles were more toxic than 1-micrometer particles. The study showed that smaller nanoplastics at higher concentrations inhibited algal growth and photosynthesis, disrupted antioxidant enzyme activity, and altered gene expression, suggesting size-dependent toxicity mechanisms.
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.
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.
Transcriptomic analysis of dinoflagellate Prorocentrum cordatum exposed to microplastics under different nitrogen sources
Researchers studied the transcriptomic response of the dinoflagellate Prorocentrum cordatum to microplastic exposure under different nitrogen sources (nitrate versus urea). Microplastic effects on gene expression differed depending on nitrogen source, suggesting that the chemical environment modulates how algae respond to plastic pollution.
Microplastics inhibit the growth of endosymbiotic Symbiodinium tridacnidorum by altering photosynthesis and bacterial community
Researchers exposed a type of algae that lives inside coral to polystyrene microplastics and found that the particles slowed cell growth and reduced photosynthesis. At higher concentrations, the microplastics clumped together with the algal cells and caused physical damage. The findings suggest that microplastic pollution could harm coral reef ecosystems by disrupting the essential relationship between corals and their symbiotic algae.
Heterotrophic Dinoflagellate Growth and Grazing Rates Reduced by Microplastic Ingestion
Researchers found that polystyrene microplastic ingestion significantly reduced the growth and grazing rates of heterotrophic dinoflagellates, suggesting that microplastic pollution could disrupt marine microbial food webs at the single-celled predator level.
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.
Effects 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 Growth Inhibition of Polyethylene Nanoplastics on the Bait-Microalgae Isochrysis galbana Based on the Transcriptome Analysis
Researchers found that polyethylene nanoplastics (50 nm) significantly inhibited growth and reduced chlorophyll in the bait microalga Isochrysis galbana through oxidative stress and disrupted gene expression, while larger microplastics had no significant impact.
Exploring biochemical responses and cellular adaptations of Chlorella sorokiniana to polyethylene microplastic exposure
Researchers exposed the freshwater microalgae Chlorella sorokiniana to varying concentrations of polyethylene microplastics and measured the effects on growth, pigments, and biochemical composition. They found that high concentrations inhibited growth by 50% and caused reductions in pigments, lipids, and carbohydrates, while protein content increased as a stress response. The study provides insights into how microplastic pollution may disrupt the base of freshwater food webs by affecting primary producers.