keyword
https://read.qxmd.com/read/38504890/effect-of-extracellular-polymeric-substances-on-the-colony-size-and-morphological-changes-of-microcystis
#1
JOURNAL ARTICLE
Jiaxin Pan, Zhongyong Yang, Nan Hu, Bangding Xiao, Chunbo Wang, Xingqiang Wu, Tiantian Yang
Surface blooms of colony-forming Microcystis are increasingly occurring in aquatic ecosystems on a global scale. Recent studies have found that the Microcystis colonial morphology is a crucial factor in the occurrence, persistence, and dominance of Microcystis blooms, yet the mechanism driving its morphological dynamics has remained unknown. This study conducted a laboratory experiment to test the effect of extracellular polymeric substances on the morphological dynamics of Microcystis . Ultrasound was used to disaggregate colonies, isolating the cells and of the Microcysti s suspension...
2024: Frontiers in Plant Science
https://read.qxmd.com/read/38460263/phthalocyanine-blue-leaching-and-exposure-effects-on-microcystis-aeruginosa-cyanobacteria-of-photoaged-microplastics
#2
JOURNAL ARTICLE
Ganning Zeng, Mengzheng Dai, Peirui Liu, Tiansheng Chen, Lingling Hu, Hongwei Luo, Qian Zhou, Mingming Du, Xiangliang Pan
Light-stabilizing additives may contribute to the overall pollution load of microplastics (MPs) and potentially enter the food chain, severely threatening aquatic life and human health. This study investigated the variation between polystyrene (PS) MPs and phthalocyanine blue (CuPC)-containing MPs before and after photoaging, as well as their effects on Microcystis aeruginosa. The presence of PS-MPs increased cell mortality, antioxidant enzyme activity, and the variation in extracellular components, while the presence of CuPC exacerbated these variations...
March 7, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38390827/repeated-exposure-enhanced-toxicity-of-clarithromycin-on-microcystis-aeruginosa-versus-single-exposure-through-photosynthesis-oxidative-stress-and-energy-metabolism-shift
#3
JOURNAL ARTICLE
Yufeng Mao, Kailai Ye, Shengfa Yang, Muhammad Salam, Weiwei Yu, Qiang He, Ruixu He, Hong Li
Antibiotics are being increasingly detected in aquatic environments, and their potential ecological risk is of great concern. However, most antibiotic toxicity studies involve single-exposure experiments. Herein, we studied the effects and mechanisms of repeated versus single clarithromycin (CLA) exposure on Microcystis aeruginosa . The 96 h effective concentration of CLA was 13.37 μg/L upon single exposure but it reduced to 6.90 μg/L upon repeated exposure. Single-exposure CLA inhibited algal photosynthesis by disrupting energy absorption, dissipation and trapping, reaction center activation, and electron transport, thereby inducing oxidative stress and ultrastructural damage...
February 23, 2024: Environmental Science & Technology
https://read.qxmd.com/read/38382604/field-and-laboratory-studies-of-fluorescence-based-technologies-for-real-time-tracking-of-cyanobacterial-cell-lysis-and-potential-microcystins-release
#4
JOURNAL ARTICLE
Kuo-Pei Tsai, Zachary A Kirschman, Christian Moldaenke, Justin D Chaffin, Andrew McClure, Youngwoo Seo, Thomas B Bridgeman
Elevated levels of dissolved microcystins (MCs) in source water due to rapid cell lysis of harmful cyanobacterial blooms may pose serious challenges for drinking water treatment. Catastrophic cell lysis can result from outbreaks of naturally-occurring cyanophages - as documented in Lake Erie during the Toledo water crisis of 2014 and in 2019, or through the application of algaecides or water treatment chemicals. Real-time detection of cyanobacterial cell lysis in source water would provide a valuable tool for drinking water plant and reservoir managers...
February 20, 2024: Science of the Total Environment
https://read.qxmd.com/read/38369089/toxic-effects-and-action-mechanism-of-metal-organic-framework-uio-66-nh-2-in-microcystisaeruginosa
#5
JOURNAL ARTICLE
Yiling Li, Wen-Xiong Wang
The zirconium metal-organic framework UiO-66-NH2 has garnered considerable attention for their potentials of removing environmental contaminants from water. The production and application of UiO-66-NH2 make their releases into the aquatic environment inevitable. Nevertheless, little information is available regarding its potential risk to the environment and aquatic organisms, thus limiting the evaluation of its safe and sustainable use. In this study, the ecotoxicity of UiO-66-NH2 was evaluated, specifically its impacts on growth, extracellular organic matter release, and metabolomic changes of the model phytoplankton Microcystis aeruginosa (M...
February 16, 2024: Environmental Pollution
https://read.qxmd.com/read/38360412/feasibility-and-mechanism-of-removing-microcystis-aeruginosa-and-degrading-microcystin-lr-by-dielectric-barrier-discharge-plasma
#6
JOURNAL ARTICLE
Jie Wang, Jiahua Zhang, Guofeng Cheng, Yuyi Shangguan, Guanyi Yang, Xingguo Liu
Harmful cyanobacterial bloom is one of the serious environmental problems worldwide. Microcystis aeruginosa is a representative harmful alga in cyanobacteria bloom. It is of great significance to develop new technologies for the removal of Microcystis aeruginosa and microcystins. The feasibility and mechanism of removing microcystis aeruginosa and degrading microcystins by dielectric barrier discharge (DBD) plasma were studied. The suitable DBD parameters obtained in this study are DBD (41.5 W, 40 min) and DBD (41...
February 13, 2024: Chemosphere
https://read.qxmd.com/read/38341000/compensatory-growth-of-microcystis-aeruginosa-after-copper-stress-and-the-characteristics-of-algal-extracellular-organic-matter-eom
#7
JOURNAL ARTICLE
Xiaopeng Qiu, Jiaqi Wang, Fengdan Xin, Yangtao Wang, Zijun Liu, Jinli Wei, Xin Sun, Pengfei Li, Xin Cao, Xing Zheng
Cyanobacterial blooms can impair drinking water quality due to the concomitant extracellular organic matter (EOM). As copper is often applied as an algicide, cyanobacteria may experience copper stress. However, it remains uncertain whether algal growth compensation occurs and how EOM characteristics change in response to copper stress. This study investigated the changes in growth conditions, photosynthetic capacity, and EOM characteristics of M. aeruginosa under copper stress. In all copper treatments, M. aeruginosa experienced a growth inhibition stage followed by a growth compensation stage...
February 8, 2024: Chemosphere
https://read.qxmd.com/read/38340819/non-microcystin-extracellular-metabolites-of-microcystis-aeruginosa-impair-viability-and-reproductive-gene-expression-in-rainbow-trout-cell-lines
#8
JOURNAL ARTICLE
Keira Harshaw, Ambreen Fahim, Jinmei Zi, P Charukeshi Chandrasekera, Xuexiu Chang, Brian Dixon, Hugh J MacIsaac
Microcystis aeruginosa is a ubiquitous freshwater cyanobacterium best known for producing hepatotoxic microcystins; however, this common bloom-forming species also produces myriad biologically active and potentially deleterious other metabolites. Our understanding of the effects of these non-microcystin metabolites on fish is limited. In this study, we evaluated cytotoxicity of extracellular metabolites harvested from both microcystin-producing (MC+) and non-producing (MC-) strains of M. aeruginosa on rainbow trout (Oncorhynchus mykiss) cell lines derived from tissues of the brain, pituitary, heart, gonads, gills, skin, liver, and milt...
February 8, 2024: Science of the Total Environment
https://read.qxmd.com/read/38217816/metal-sequestration-by-microcystis-extracellular-polymers-a-promising-path-to-greener-water-treatment
#9
JOURNAL ARTICLE
Sengjrang Ch Momin, Ran Bahadur Pradhan, Jyotishma Nath, Ruthi Lalmuanzeli, Agniv Kar, Surya Kant Mehta
The problem of heavy metal pollution in water bodies poses a significant threat to both the environment and human health, as these toxic substances can persist in aquatic ecosystems and accumulate in the food chain. This study investigates the promising potential of using Microcystis aeruginosa extracellular polymeric substances (EPS) as an environmentally friendly, highly efficient solution for capturing copper (Cu2+ ) and nickel (Ni2+ ) ions in water treatment, emphasizing their exceptional ability to promote green technology in heavy metal sequestration...
January 13, 2024: Environmental Science and Pollution Research International
https://read.qxmd.com/read/38181954/physiology-microcystin-production-and-transcriptomic-responses-of-microcystis-aeruginosa-exposed-to-calcium-and-magnesium
#10
JOURNAL ARTICLE
Li Yin, Lin Xu, Kaipian Shi, Weiyu Chen, Yong Zhang, Juan Wang, Junfeng An, Huan He, Shaogui Yang, Lixiao Ni, Shiyin Li
Calcium ions (Ca2+ ) and magnesium ions (Mg2+ ) are pivotal in the community composition and stability of harmful cyanobacteria, yet the physiological and molecular responses remains poorly understood. This study aims to explore these responses in the high microcystin producer Microcystis aeruginosa (M. aeruginosa). Results indicate that the growth of M. aeruginosa is inhibited by Ca2+ /Mg2+ exposure (0.5-10 mM), while Fv/Fm photosynthetic parameters and extracellular microcystin-leucine-arginine (MC-LR) concentrations increase...
January 3, 2024: Science of the Total Environment
https://read.qxmd.com/read/38125563/the-extracellular-polysaccharide-determine-the-physico-chemical-surface-properties-of-microcystis
#11
JOURNAL ARTICLE
Haijian Yang, Denghua Wu, Hua Li, Chunxiang Hu
Microcystis possesses the capacity to form colonies and blooms in lakes and reservoirs worldwide, causing significant ecological challenges in aquatic ecosystems. However, little is known about the determining factors of physico-chemical surface properties that govern the competitive advantage of Microcystis . Here, The physico-chemical surface properties of Microcystis wesenbergii and Microcystis aeruginosa , including specific surface area (SSA), hydrophobicity, zeta potential, and functional groups were investigated...
2023: Frontiers in Microbiology
https://read.qxmd.com/read/38081424/microcystis-genotypes-in-a-tropical-freshwater-lake-discovery-of-novel-mib-producing-microcystis-with-potentially-unique-synthesis-pathway
#12
JOURNAL ARTICLE
Kwan Chien Goh, Zhi Yang Sim, Shu Harn Te, Yiliang He, Karina Yew-Hoong Gin
Harmful algal blooms (HABs) are a threat to freshwater systems over the world due to the production of hepatotoxins like microcystin (MC), and nuisance taste and odour (T&O) compounds like 2-methylisoborneol (MIB). While MCs are known to cause detrimental effects to both water quality and human health, MIB is only reported to cause aesthetical problems. In this study, we investigated a tropical, urban lake that was experiencing persistent MC and MIB events. Although it was dominated by Microcystis blooms, analysis revealed that the toxigenic Microcystis were not the only species driving the MC concentrations...
December 9, 2023: Science of the Total Environment
https://read.qxmd.com/read/38070753/extraction-and-analysis-by-liquid-chromatography-tandem-mass-spectrometry-of-intra-and-extracellular-microcystins-and-nodularin-to-study-the-fate-of-cyanobacteria-and-cyanotoxins-across-the-freshwater-marine-continuum
#13
JOURNAL ARTICLE
Damien Réveillon, Maxime Georges des Aulnois, Véronique Savar, Elise Robert, Amandine M N Caruana, Enora Briand, Myriam Bormans
The presence of microcystins (MCs) is increasingly being reported in coastal areas worldwide. To provide reliable data regarding this emerging concern, reproducible and accurate methods are required to quantify MCs in salt-containing samples. Herein, we characterized methods of extraction and analysis by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) for nine MCs and one nodularin (NOD) variants in both cyanobacteria (intracellular) and dissolved forms (extracellular). Different approaches have been used to cope with salinity for the extraction of dissolved MCs but none assessed solid phase extraction (SPE) so far...
December 7, 2023: Toxicon: Official Journal of the International Society on Toxinology
https://read.qxmd.com/read/38061645/effects-of-micro-sized-biodegradable-plastics-on-microcystis-aeruginosa
#14
JOURNAL ARTICLE
Jee Young Kim, Ka Young Kim, Woo Shik Jung, Hyun Soo Kim, Byeolnim Oh, Jaewon Park, Yoon-E Choi
Plethora of plastics are being used in current society, generating huge amounts of plastic waste. Non-biodegradability of conventional plastics is one of the main challenges to treat plastic waste. In an effort to increase the efficiency of plastic waste treatment, biodegradable plastics have gained attention. Although the use of biodegradable plastics has been increased, their potential effects on the environments are not fully elucidated yet. In this study, the impacts of micro-sized non-biodegradable plastic (i...
December 5, 2023: Science of the Total Environment
https://read.qxmd.com/read/38017598/effects-of-the-nutrient-inhibition-on-the-yield-of-dbpfps-by-microcystis-aeruginosa
#15
JOURNAL ARTICLE
Liu Zhiquan, Huang Rui, Wang Zhu, Cui Fuyi, Hu Chun
The yield of three disinfection byproduct formation potentials (DBPFPs), including trichloromethane, dichloroacetic acid and trichloroacetic acid formation potential (TCMFP, DCAAFP and TCAAFP), by Microcystis aeruginosa under the nitrate and phosphate inhibition conditions was investigated. The results showed that excessive nitrate could inhibit the growth of M. aeruginosa, but the concentration of DBPFPs in the five fractions of algal metabolites, including hydrophilic extracellular organic matter (EOM), hydrophobic EOM, hydrophilic intracellular organic matter, hydrophobic intracellular organic matter and cell debris, only decreased slightly...
November 2023: Journal of Water and Health
https://read.qxmd.com/read/37939808/changes-in-microcystin-concentration-in-lake-taihu-13-years-2007-2020-after-the-2007-drinking-water-crisis
#16
JOURNAL ARTICLE
Kaiye Zhang, Yurong Gu, Chen Cheng, Qingju Xue, Liqiang Xie
Since the 2007 water crisis occurred in Lake Taihu, substantial measures have been taken to restore the lake. This study evaluates the effectiveness of these restoration activities. We examined the physicochemical parameters and the distribution of microcystin and Microcystis in both the water column and sediment during the bloom period of May 2020 to October 2020. The mean value of extracellular and intracellular microcystin content was 0.12 μg L-1 and 16.26 μg L-1 , respectively...
November 6, 2023: Environmental Research
https://read.qxmd.com/read/37884453/novel-ecological-implications-of-non-toxic-microcystis-towards-toxic-ecotype-in-population-promoting-toxic-ecotype-dominance-at-various-n-levels-and-cooperative-defense-against-luteolin-stress
#17
JOURNAL ARTICLE
Zhonghui Guo, Jieming Li, Di Luo, Mingxia Zhang
Microcystin (MC)-producing (MC+) and MC-free (MC-) Microcystis always co-exist and interact during Microcystis-dominated cyanobacterial blooms (MCBs), where MC+  Microcystis abundance and extracellular MCs content (EMC) determine the hazard extent of MCBs. The study elucidated intraspecific interaction between MC+ and MC-  Microcystis at various nitrogen (N) levels (0.5-50 mg/L) and how such N-mediated interaction impacted algicidal and EMC-inhibiting effect of luteolin, a natural bioalgicide...
October 26, 2023: FEMS Microbiology Ecology
https://read.qxmd.com/read/37866108/the-competitive-advantage-of-microcystis-aeruginosa-over-scenedesmus-obliquus-weakened-by-exposure-to-polylactic-acid-microplastics
#18
JOURNAL ARTICLE
Zhipeng Zhen, Ran Cai, Muhammad Salam, Jianmei Hu, Bing Yang, Mengzi Liu, Hong Li, Bingran Tang
Aquatic ecosystems are heavily affected by microplastics (MPs), and its impacts on aquatic life have received extensive attention. However, it is still unclear how biodegradable MPs influence the growth and competition of phytoplankton. In this study, the response of growth dynamics, alternation in algal cell morphology and toxin-producing capability, and changes in the extracellular process of Microcystis aeruginosa (M. aeruginosa) and Scenedesmus obliquus (S. obliquus) were systematically studied in monoculture and co-culture conditions with and without the presence of polylactic acid MPs (PLA-MPs)...
October 20, 2023: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/37844340/phytoplankton-interspecific-interactions-modified-by-symbiotic-fungi-and-bacterial-metabolites-under-environmentally-relevant-hydrogen-peroxide-concentrations-stress
#19
JOURNAL ARTICLE
Zhe Li, Hua Ma, Zhicheng Hong, Ting Zhang, Mingxing Cao, Fuyi Cui, Hans-Peter Grossart
Hydrogen peroxide (H2 O2 ), which accumulates in water and triggers oxidative stress for aquatic microbes, has been shown to have profound impacts on planktonic microbial community dynamics including cyanobacterial bloom formation. Yet, potential effects of H2 O2 on interspecific relationships of phytoplankton-microbe symbiotic interactions remain unclear. Here, we investigated effects of environmentally relevant H2 O2 concentrations on interspecific microbial relationships in algae-microbe symbiosis. Microbes play a crucial role in the competition between M...
October 12, 2023: Water Research
https://read.qxmd.com/read/37778795/toxicity-of-the-disinfectant-benzalkonium-chloride-c-14-towards-cyanobacterium-microcystis-results-from-its-impact-on-the-photosynthetic-apparatus-and-cell-metabolism
#20
JOURNAL ARTICLE
Yunlu Jia, Yi Huang, Jin Ma, Shangwei Zhang, Jin Liu, Tianli Li, Lirong Song
Quaternary ammonium compounds (QACs) are commonly used in a variety of consumer and commercial products, typically as a component of disinfectants. During the COVID-19 pandemic, QACs became one of the primary agents utilized to inactivate the SARS-CoV-2 virus on surfaces. However, the ecotoxicological effects of QACs upon aquatic organisms have not been fully assessed. In this study, we examined the effects of a widely used QAC (benzalkonium chloride-C14 , BAC-14) on two toxigenic Microcystis strains and one non-toxigenic freshwater Microcystis strain and carried out an analysis focused on primary, adaptive and compensatory stress responses at apical (growth and photosynthesis) and metabolic levels...
January 2024: Journal of Environmental Sciences (China)
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