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https://www.readbyqxmd.com/read/29965713/-seasonal-and-spatial-variations-of-microcystins-and-their-relationships-with-physiochemical-and-biological-factors-in-poyang-lake
#1
Li-Juan Yuan, Qie-Gen Liao, Li Zhang, Da-Wen Zhang, Lin-Guang Luo, Ju-Tao Liu
Poyang Lake is the largest freshwater lake in China and an important drinking water source for Jiangxi Province. Since the year 2000, toxic cyanobacteria have been observed frequently in Poyang Lake. In this study, water samples were collected in the lake quarterly (April 2012, August 2012, October 2012, and January 2013) to examine the spatial and seasonal variations in the concentrations of microcystins (MCs; MC-RR, -YR, and -LR) and their relationships with physiochemical and biological factors. MCs were determined by ultra-high-performance liquid chromatography-electrospray ionization tandem triple quadrupole/mass spectrometry (UPLC-MS/MS)...
January 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
https://www.readbyqxmd.com/read/29909220/worse-than-cell-lysis-the-resilience-of-oscillatoria-sp-during-sludge-storage-in-drinking-water-treatment
#2
Jiongming Sun, Hangzhou Xu, Haiyan Pei, Yan Jin, Hongmin Li, Chunxia Ma
Benthic Oscillatoria sp. may form dense surface blooms especially under eutrophic and calm conditions, which poses a threat to drinking water safety because it can produce toxic and odorous metabolites. This is the first study to investigate the effect of the conventional coagulant polyaluminium ferric chloride (PAFC) on removal of Oscillatoria sp., and the behavior of Oscillatoria sp. cells in sludges formed from different dosages of PAFC (control, optimum, and overdose system) during storage was also studied...
October 1, 2018: Water Research
https://www.readbyqxmd.com/read/29869212/effects-of-multiple-environmental-factors-on-the-growth-and-extracellular-organic-matter-production-of-microcystis-aeruginosa-a-central-composite-design-response-surface-model
#3
Mengqi Jiang, Zheng Zheng
In this study, statistically designed experiments using response surface methodology were conducted on Microcystis aeruginosa. A central composite design response surface model was established to investigate the multiple effects of various physical and chemical factors (total nitrogen, total phosphorus, temperature, and light intensity) on algal density and extracellular organic matter. The results of the experiments reveal that nitrate and phosphate had significant interactive effects on algal density, both iron and light intensity had synergic effects on the production of microcystins (MC-LR) and extracellular polysaccharides (EPS), and light intensity and nitrite had clear interactive effects on EPS release...
June 4, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29774437/lexa-binds-to-transcription-regulatory-site-of-cell-division-gene-ftsz-in-toxic-cyanobacterium-microcystis-aeruginosa
#4
Takashi Honda, Daichi Morimoto, Yoshihiko Sako, Takashi Yoshida
Previously, we showed that DNA replication and cell division in toxic cyanobacterium Microcystis aeruginosa are coordinated by transcriptional regulation of cell division gene ftsZ and that an unknown protein specifically bound upstream of ftsZ (BpFz; DNA-binding protein to an upstream site of ftsZ) during successful DNA replication and cell division. Here, we purified BpFz from M. aeruginosa strain NIES-298 using DNA-affinity chromatography and gel-slicing combined with gel electrophoresis mobility shift assay (EMSA)...
August 2018: Marine Biotechnology
https://www.readbyqxmd.com/read/29728971/arsenic-uptake-transformation-and-release-by-three-freshwater-algae-under-conditions-with-and-without-growth-stress
#5
Shaowen Xie, Jinxin Liu, Fen Yang, Hanxiao Feng, Chaoyang Wei, Fengchang Wu
This study was carried out using indoor controlled experiments to study the arsenic (As) uptake, biotransformation, and release behaviors of freshwater algae under growth stress. Three freshwater algae, Microcystis aeruginosa, Anabaena flosaquae, and Chlorella sp., were chosen. Two types of inhibitors, e.g., Cu2+ and isothiazolinone, were employed to inhibit the growth of the algae. The algae were cultivated to a logarithmic stage in growth media containing 0.1 mg/L P; then, 0.8 mg/L As in the form of arsenate (iAsV ) was added, while both inhibitors were simultaneously added at dosages of 0...
July 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29675015/cell-lysis-and-detoxification-of-cyanotoxins-using-a-novel-combination-of-microbubble-generation-and-plasma-microreactor-technology-for-ozonation
#6
Jagroop Pandhal, Anggun Siswanto, Dmitriy Kuvshinov, William B Zimmerman, Linda Lawton, Christine Edwards
There has been a steady rise in the incidences of algal blooms globally, and worryingly, there is increasing evidence that changes in the global climate are leading to a shift toward cyanobacterial blooms. Many cyanobacterial genera are harmful, producing several potent toxins, including microcystins, for which there are over 90 described analogues. There are a wide range of negative effects associated with these toxins including gastroenteritis, cytotoxicity, hepatotoxicity and neurotoxicity. Although a variety of oxidation based treatment methods have been described, ozonation and advanced oxidation are acknowledged as most effective as they readily oxidise microcystins to non-toxic degradation products...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29644613/low-level-concentrations-of-aminoglycoside-antibiotics-induce-the-aggregation-of-cyanobacteria
#7
Lin-Rui Tan, Peng-Fei Xia, Raymond J Zeng, Qian Li, Xue-Fei Sun, Shu-Guang Wang
The interactions between antibiotics and microorganisms have attracted enormous research attentions. In this study, we investigated the effects of two typical aminoglycoside antibiotics on the aggregation of the model cyanobacterium, Synechococcus elongatus, and the dominating strain in algal blooms, Microcystis aeruginosa, via the analysis of zeta potentials, hydrophobicity, and extracellular polymeric substances (EPS) secretion. The results showed that low-level antibiotics promoted the aggregation of S. elongatus and M...
June 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29515552/the-cyanobacterium-cylindrospermopsis-raciborskii-cyrf-01-responds-to-environmental-stresses-with-increased-vesiculation-detected-at-single-cell-resolution
#8
Victor Zarantonello, Thiago P Silva, Natália P Noyma, Juliana P Gamalier, Mariana M Mello, Marcelo M Marinho, Rossana C N Melo
Secretion of membrane-limited vesicles, collectively termed extracellular vesicles (EVs), is an important biological process of both eukaryotic and prokaryotic cells. This process has been observed in bacteria, but remains to be better characterized at high resolution in cyanobacteria. In the present work, we address the release of EVs by Cylindrospermopsis raciborskii (CYRF-01), a filamentous bloom-forming cyanobacterium, exposed to environmental stressors. First, non-axenic cultures of C. raciborskii (CYRF-01) were exposed to ultraviolet radiation (UVA + UVB) over a 6 h period, which is known to induce structural damage to this species...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29486445/effect-of-propionamide-on-the-growth-of-microcystis-flos-aquae-colonies-and-the-underlying-physiological-mechanisms
#9
Xiang Wu, Hao Wu, Saijun Wang, Yimian Wang, Rongfei Zhang, Xiaobin Hu, Jinyun Ye
Reducing the formation and growth of Microcystis colonies is an important prerequisite for the effective prevention and treatment of cyanobacterial blooms. Microcystis flos-aquae colonies was selected to investigate the potential of propionamide for use in controlling cyanobacterial blooms. Propionamide, one of the major allelochemicals in the root exudates of E. crassipes, was tested using different concentrations (0, 0.2, 1, and 2mgL-1 ) and dosing methods (one-time addition, semi-continuous addition, and continuous addition) to assess its effect on the growth of M...
July 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29413381/colony-formation-in-two-microcystis-morphotypes-effects-of-temperature-and-nutrient-availability
#10
Zhipeng Duan, Xiao Tan, Keshab Parajuli, Sanjina Upadhyay, Danfeng Zhang, Xiaoqian Shu, Qianqian Liu
The ability of Microcystis to form large colonies is a key trait that contributes to competition ability over other phytoplankton and facilitates the formation of surface scums in many freshwater systems. The effect of temperature and nutrients on this trait, however, is far from clear and needs further investigation, especially under a warmer climate and nutrient overloading in aquatic systems globally. In this study, two colonial strains of Microcystis (M. wesenbergii and M. ichthyoblabe) originally isolated from Lake Taihu in China, were used to investigate cyanobacterial aggregation under a range of temperatures (15-30 °C), phosphorus availability (0...
February 2018: Harmful Algae
https://www.readbyqxmd.com/read/29353776/changes-in-microcystis-aeruginosa-cell-integrity-and-variation-in-microcystin-lr-and-proteins-during-tanfloc-flocculation-and-floc-storage
#11
Jun Hou, Zijun Yang, Peifang Wang, Chao Wang, Yangyang Yang, Xun Wang
The objective of this study was to determine the influence of Tanfloc on Microcystis aeruginosa cell integrity, microcystin-LR (MC-LR), and proteins during flocculation and floc storage. The effects of Tanfloc addition, stirring, and floc storage time were considered to minimize cell damage and the release of MC-LR and proteins. Optimal flocculation conditions (Tanfloc dosage 10.42 mg L-1 , rapid agitation for 0.36 min at 568.88 rpm and slow agitation for 14.14 min at 12.1 rpm) were obtained using the response surface methodology...
June 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29335171/effect-of-hydrogen-peroxide-on-microcystic-aeruginosa-role-of-cytochromes-p450
#12
Jia Wang, Zunwei Chen, Hui Chen, Yuezhong Wen
Cyanobacterial bloom has been rising as a worldwide issue owing to its adverse effects to water quality and ecological health. To solve this problem, hydrogen peroxide (H2 O2 ) has been considered as a potential algaecide because no by-products are generated after treatment and because it kills cyanobacteria selectively. In addition, cytochromes P450 (CYPs) was reported to be related with H2 O2 , but the roles of CYPs in the regulation of H2 O2 in cyanobacteria have yet to be investigated. In this study, the CYPs suicide inhibitor 1-aminobenzotriazole (ABT) was added to the representative cyanobacteria Microcystis aeruginosa (M...
June 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29324383/the-influence-of-algal-organic-matter-produced-by-microcystis-aeruginosa-on-coagulation-ultrafiltration-treatment-of-natural-organic-matter
#13
Jie Xu, Yanxia Zhao, Baoyu Gao, Songlin Han, Qian Zhao, Xiaoli Liu
Cyanobacterial bloom causes the release of algal organic matter (AOM), which inevitably affects the treatment processes of natural organic matter (NOM). This study works on treating micro-polluted surface water (SW) by emerging coagulant, namely titanium sulfate (Ti(SO4 )2 ), followed by Low Pressure Ultrafiltration (LPUF) technology. In particular, we explored the respective influence of extracellular organic matter (EOM) and intracellular organic matter (IOM) on synergetic EOM-NOM/IOM-NOM removal, functional mechanisms and subsequent filtration performance...
April 2018: Chemosphere
https://www.readbyqxmd.com/read/29291583/intracellular-and-extracellular-retinoid-like-activity-of-widespread-cyanobacterial-species
#14
Jana Priebojová, Klára Hilscherová, Tereza Procházková, Eliška Sychrová, Marie Smutná
Cyanobacterial species produce wide range of bioactive compounds. This study characterized production of retinoid-like compounds with embryotoxic and teratogenic potential by commonly occurring cyanobacterial species with tendency to form massive water blooms. The major goal was to simultaneously assess the intracellular and extracellular retinoid-like activity from several independent cultivations of one coccal (Microcystis aeruginosa) and four filamentous cyanobacteria (Aphanizomenon gracile, Cylindrospermopsis raciborskii, Limnothrix redekeii, and Planktothrix agardhii) and characterize the variability in its production among cultivations...
April 15, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29275484/growth-extracellular-alkaline-phosphatase-activity-and-kinetic-characteristic-responses-of-the-bloom-forming-toxic-cyanobacterium-microcystis-aeruginosa-to-atmospheric-particulate-matter-pm-2-5-pm-2-5-10-and-pm-10
#15
Ziran Xu, Shoubing Wang, Yuanan Wang, Jie Zhang
Atmospheric particulate matter (APM), commonly seen and widely excited in environment, appears great enough to influence the biochemical processes in aquatic microorganisms and phytoplankton. Understanding the response of cyanobacteria to various factors is fundamental for eutrophication control. To clarify the response of cyanobacteria to APM, the effects of PM2.5 , PM2.5-10 , and PM>10 on Microcystis aeruginosa were researched. Variabilities in cell density, chlorophyll a, soluble protein, malondialdehyde, extracellular activity, and kinetic parameters of alkaline phosphatase were evaluated by lab-cultured experiments...
March 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29247956/electrochemical-inactivation-of-microcystis-aeruginosa-using-bdd-electrodes-kinetic-modeling-of-microcystins-release-and-degradation
#16
Shiqing Zhou, Lingjun Bu, Zhou Shi, Lin Deng, Shumin Zhu, Naiyun Gao
Electrochemical inactivation of cyanobacteria using boron-doped diamond (BDD) electrode were comprehensively investigated in this study. The pulse amplitude modulated (PAM) fluorometry, flow cytometry, and confocal laser scanning microscopy (CLSM) were used to characterize the photosynthetic capacity and cell integrity of Microcystis aeruginosa. Persulfate is in-situ generated and activated during the process and responsible for the inactivation of M. aeruginosa. The inactivation efficiency increases along with the increase of applied currents...
March 15, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29236244/evaluation-of-disinfection-by-product-formation-during-chlor-am-ination-from-algal-organic-matter-after-uv-irradiation
#17
Shi Chen, Jing Deng, Lei Li, Naiyun Gao
This study evaluated the effect of low-pressure ultraviolet (UV) irradiation on the formation of disinfection by-products (DBPs) from algal organic matter of Microcystis aeruginosa during subsequent chlorination and chloramination. The algal organic matter includes extracellular organic matter (EOM) and intracellular organic matter (IOM). The fluorescence excitation-emission matrix spectra indicated that the humic/fulvic acid-like organics of EOM and the protein-like organics of IOM may be preferentially degraded by UV treatment...
February 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29190469/effects-of-solution-chemistry-on-the-sunlight-inactivation-of-particles-associated-viruses-ms2
#18
Xueyin Wu, Zhe Feng, Baoling Yuan, Zhenming Zhou, Fei Li, Wenjie Sun
The inactivation efficacy of bacteriophage MS2 by simulated sunlight irradiation was investigated to understand the effects of MS2 aggregation and adsorption to particles in solutions with different components. Kaolinite and Microcystis aeruginosa were used as model inorganic and organic particles, respectively. Lower pH and di-valent ions (Ca2+ ) were main factors on the aggregation and inactivation of MS2. In the presence of both particles, there was no significant impact on the MS2 inactivation efficacy by kaolinite (10-200mM) or Microcystis aeruginosa (102 -105 Cells/mL) in 1mM NaCl at pH 7...
February 1, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29063395/combined-effects-of-binary-antibiotic-mixture-on-growth-microcystin-production-and-extracellular-release-of-microcystis-aeruginosa-application-of-response-surface-methodology
#19
Zhiyuan Wang, Qiuwen Chen, Liuming Hu, Min Wang
The interactive effects of binary antibiotic mixtures of spiramycin (SP) and ampicillin (AMP) on Microcystis aeruginosa (MA) in terms of growth as well as microcystin production and extracellular release were investigated through the response surface methodology (RSM). SP with higher 50 and 5% effective concentrations in MA growth was more toxic to MA than AMP. RSM model for toxic unit approach suggested that the combined toxicity of SP and AMP varied from synergism to antagonism with SP/AMP mixture ratio decreasing from reversed equitoxic ratio (5:1) to equitoxic ratio (1:5)...
January 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29051599/using-quartz-sand-to-enhance-the-removal-efficiency-of-m-aeruginosa-by-inorganic-coagulant-and-achieve-satisfactory-settling-efficiency
#20
Haiyan Pei, Yan Jin, Hangzhou Xu, Chunxia Ma, Jiongming Sun, Hongmin Li
In this study, low-cost and non-polluting quartz sand was respectively mixed with AlCl3 , FeCl3 and PAFC to synergistically remove Microcystis aeruginosa. Results showed that quartz sand could markedly increase the algae removal efficiency and decrease the coagulant doses. The increase of removal efficiency with AlCl3 and FeCl3 was only due to the enhancement of floc density by the quartz sand. However, the removal efficiency with PAFC was increased not only by the enhanced floc density, but also by the enlarged floc size...
October 19, 2017: Scientific Reports
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