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Leilei Bai, Chicheng Cao, Changhui Wang, Hui Zhang, Jiancai Deng, Helong Jiang
Co-existence of cyanobacterial harmful algal blooms (CyanoHABs) and steroid estrogens (SEs) has been an increasing concern in eutrophic waters. The cellular responses and biodegradation of 17β-estradiol (E2) in cyanobacterium Microcystis aeruginosa were investigated at different nitrogen levels. During the 10-d experiment, the growth of M. aeruginosa was stimulated by 10-100 μg L-1 of E2 at the lowest nitrogen level of 0.5 mg L-1 , whereas the presence of E2 inhibited the cyanobacterial growth at 5 mg L-1 of nitrogen...
December 1, 2018: Chemosphere
Ken Omori, Tania Datta, Yoshimasa Amano, Motoi Machida
In this study, two types of extracellular polysaccharides (EPS), namely, mixed EPS (MX-EPS) and tightly bound EPS (TB-EPS), were extracted from cyanobacterial blooms using different methods. To evaluate their compositional differences, elemental composition, FTIR, and TG/DTA profile were measured for both EPS samples. Following that, unicellular Microcystis aeruginosa was cultured in a medium containing EPS, Ca2+ ion, and Mg2+ ion, and the effect of each type of EPS on the colony formation of M. aeruginosa was examined...
December 11, 2018: Environmental Science and Pollution Research International
Xinying Hou, Jing Huang, Jinghong Tang, Na Wang, Lu Zhang, Lei Gu, Yunfei Sun, Zhou Yang, Yuan Huang
The elimination of cyanobacteria blooms has become an urgent concern in aquatic environmental protection. Allelopathic control is considered a potential approach because of its exclusive and ecological safety properties. The present study evaluated the allelopathic effect of juglone, a derivative from the genus Juglans, on the toxic Microcystis aeruginosa. Juglone at 3.0-9.0 mg L-1 notably depressed the cell proliferation of M. aeruginosa. The cell abundance treated by 9.0 mg L-1 juglone decreased by 75% after an 11-day exposure...
November 26, 2018: Journal of Environmental Management
Cliff Ross, B Christopher Warhurst, Amber Brown, Chase Huff, Judith D Ochrietor
As aquatic ecosystems become increasingly affected by hydrologic alterations, drought and sea level rise a need exists to better understand the biological effects of elevated salinity on toxigenic cyanobacteria such as Microcystis aeruginosa. This study investigated the impacts of oligohaline/low mesohaline conditions and exposure time on selected physiological and biochemical responses in M. aeruginosa including cell viability, oxidative stress, antioxidant responses, in addition to microcystin synthesis and release into the surrounding environment...
November 22, 2018: Aquatic Toxicology
Yulin Wang, Elbashir Araud, Joanna L Shisler, Thanh H Nguyen, Baoling Yuan
We determined the potential interference of extracellular algal organic matter (EAOM) and intracellular algal organic matter (IAOM) extracted from Microcystis aeruginosa on MS2 bacteriophage inactivation under UV irradiation at two wavelengths (220 and 254 nm). UV irradiation at 220 nm doubled the inactivation rate of MS2 in water containing EAOM than in organic-free phosphate buffered solution. In contrast, EAOM did not change MS2 inactivation by exposure to UV 254 nm. The presence of IAOM did not significantly influence MS2 inactivation by exposure to either UV 254 or UV 220 nm...
September 17, 2018: Chemosphere
Tingru Zhou, Jie Zheng, Huansheng Cao, Xuejian Wang, Kai Lou, Xihui Zhang, Yi Tao
H2 O2 has been suggested and applied as effective algaecide for harmful cyanobacterial bloom control, however, the transport of exogenous H2 O2 into microalgal cells, the subsequent intracellular damage pathway and dose-response variations were little studied. We addressed these questions in a bloom-forming cyanobacterium Microcystis aeruginosa with H2 O2 at 0.1-1.5 mM. The results showed that H2 O2 at 0.4 mM and above significantly suppressed M. aeruginosa growth for over two weeks, and induced apoptosis-like death in terms of membrane potential dissipation, caspase-3 activation, chromatin condensation, and lysis induction...
November 2018: Chemosphere
Minsoo Maeng, Nirmal Kumar Shahi, Gwyam Shin, Heejong Son, Dongheui Kwak, Seok Dockko
Allogenic organic matter (AOM) composed of extracellular and intracellular organic matter (EOM and IOM) is a major precursor of halogenated carbonaceous and nitrogenous disinfection by-products (C-DBPs and N-DBPs) upon chlorination. The EOM and IOM extracted from Microcystis aeruginosa were analyzed based on bulk parameters and organic fractions with different molecular weight by liquid chromatography with organic carbon detection (LC-OCD). It investigated the efficiency of a conventional gravity system (CGS) and dissolved air flotation (DAF) in the removal of organic precursors, together with measurement of the formation of four major trihalomethanes (THMs) and haloacetonitriles (HANs) in treated water upon chlorination...
September 12, 2018: Environmental Science and Pollution Research International
Zhenhong Wang, Zhuanxi Luo, Changzhou Yan, Ricki R Rosenfeldt, Frank Seitz, Herong Gui
Only little information is available on combined effects of abiotic environmental factors on algal arsenate ( AsV ) metabolic biokinetics. Herein, we demonstrated the methods of using the Taguchi statistical method to investigate four environmental factors including AsV , nitrate (N), orthophosphate (P) and pH for their combined effects on algal growth and arsenic ( As ) uptake but also extracellular adsorption of Microcystis aeruginosa, as well as As release from dead algal cells. Results showed that an increase of N facilitated M...
2018: MethodsX
Xiangming Tang, Lauren E Krausfeldt, Keqiang Shao, Gary R LeCleir, Joshua M A Stough, Guang Gao, Gregory L Boyer, Yunlin Zhang, Hans W Paerl, Boqiang Qin, Steven W Wilhelm
Harmful cyanobacterial blooms represent an increasing threat to freshwater resources globally. Despite increased research, the physiological basis of how the dominant bloom-forming cyanobacteria, Microcystis spp., proliferate and then maintain high population densities through changing environmental conditions is poorly understood. In this study, we examined the transcriptional profiles of the microbial community in Lake Taihu, China at 9 stations sampled monthly from June to October in 2014. To target Microcystis populations, we collected metatranscriptomic data and mapped reads to the M...
October 2, 2018: Environmental Science & Technology
Yangyang Yang, Jun Hou, Peifang Wang, Chao Wang, Xun Wang, Guoxiang You
The presence of abundant extracellular polymeric substances (EPS) play a vital role in affecting heteroaggregation process and toxicity of nanoparticles (NPs) to Microcystis aeruginosa. Interactions between n-CeO2 and cyanobacteria with/without EPS and the toxicity of n-CeO2 to M. aeruginosa were investigated in this study. Aggregation kinetics of n-CeO2 under both soluble EPS (SEPS) and bound EPS (BEPS) indicated the presence of EPS could induced the formation of EPS-NPs aggregates. Heteroaggregation between cells and n-CeO2 was confirmed through co-settling experiment and SEM-EDS observation...
November 2018: Environmental Pollution
Xiaoxiang Cheng, Daoji Wu, Heng Liang, Xuewu Zhu, Xiaobin Tang, Zhendong Gan, Jiajian Xing, Xinsheng Luo, Guibai Li
Algal extracellular organic matter (EOM) released from Microcystis aeruginosa can cause severe membrane fouling during algae-laden water treatment. To solve this problem, three typical sulfate radical-based advanced oxidation processes (SR-AOPs), i.e., ferrous iron/peroxymonosulfate (Fe(II)/PMS), UV/PMS and UV/Fe(II)/PMS, were employed as membrane pretreatment strategies. Their performance on mitigating EOM fouling of a ceramic UF membrane was systematically investigated and compared in the present study. The results indicated that SR-AOPs pretreatments could promote the reduction of DOC and UV254 , and the removal performance showed an apparent regularity of UV/Fe(II)/PMS > Fe(II)/PMS > UV/PMS...
August 8, 2018: Water Research
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
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
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...
August 2018: Environmental Science and Pollution Research International
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
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
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
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
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
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
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