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软脂酸和硬脂酸对铜绿微囊藻生长的抑制作用 被引量:5
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作者 姜闻新 贾永 +2 位作者 王从彦 王倩 田兴军 《生态环境学报》 CSCD 北大核心 2010年第2期291-295,共5页
研究了软脂酸和硬脂酸对产毒铜绿微囊藻Microcystis aeruginosa生长的抑制效应,比较了长链饱和脂肪酸抑藻的构效关系。选用的藻种是购于中国科学院水生生物研究所的产毒铜绿微囊藻Microcystis aeruginosa FACHB-912,且实验藻种处于对数... 研究了软脂酸和硬脂酸对产毒铜绿微囊藻Microcystis aeruginosa生长的抑制效应,比较了长链饱和脂肪酸抑藻的构效关系。选用的藻种是购于中国科学院水生生物研究所的产毒铜绿微囊藻Microcystis aeruginosa FACHB-912,且实验藻种处于对数生长期。软脂酸和硬脂酸在藻液中的4种最终质量浓度为:30、60、90和120mg·L-1。实验周期为6d,每天定时定量取藻液,测量A(650nm),叶绿素a含量,藻蓝蛋白含量。实验结束后,采用SPSS(13.0版本)软件和DPS(7.05版本)分析加入这2种脂肪酸的藻液的3个指标与空白对照之间的差异显著性。结果表明,2种饱和脂肪酸的4种质量浓度对产毒铜绿微囊藻均有显著的抑制作用,浓度越大,抑藻效果越明显。其中,2种饱和脂肪酸在相同浓度的条件下,软脂酸比硬脂酸的抑制作用要明显。实验技术方面有2个创新点:①因为长链饱和脂肪酸无法溶于蒸馏水,实验采用乙醇来溶解脂肪酸。②因为溶于乙醇的长链饱和脂肪酸溶液无法用高压灭菌锅灭菌,实验采用微孔滤膜对脂肪酸溶液进行灭菌。 展开更多
关键词 毒铜绿微囊藻 脂肪酸 效应
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重金属镉对铜绿微囊藻的分层胞外聚合物淬灭机制研究 被引量:1
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作者 王奇 葛姝洁 +3 位作者 于恒国 赵敏 汪德进 王传花 《安庆师范大学学报(自然科学版)》 2020年第3期76-83,共8页
通过三维荧光光谱法研究铜绿微囊藻(Microcystic aeruginosa)产毒株FACHB-905和不产毒株FACHB-469分层胞外聚合物(EPS)的差异性以及Cd(Ⅱ)对EPS的淬灭机制。结果表明:FACHB-905分层EPS中主要含有4种荧光基团(色氨酸、芳香蛋白Ⅰ和2种类... 通过三维荧光光谱法研究铜绿微囊藻(Microcystic aeruginosa)产毒株FACHB-905和不产毒株FACHB-469分层胞外聚合物(EPS)的差异性以及Cd(Ⅱ)对EPS的淬灭机制。结果表明:FACHB-905分层EPS中主要含有4种荧光基团(色氨酸、芳香蛋白Ⅰ和2种类腐殖酸),FACHB-469分层EPS中主要含有6种荧光基团(色氨酸、芳香蛋白Ⅰ和4种类腐殖酸)。两者的分层EPS中芳香类蛋白比色氨酸、类腐殖酸有更大的Cd(Ⅱ)结合能力,FACHB-469比FACHB-905更易与Cd(Ⅱ)结合,附着型LB/TB-EPS中芳香蛋白Ⅰ均能被Cd(Ⅱ)有效淬灭,且以动态淬灭为主导,类腐殖酸能被静态淬灭。Cd(Ⅱ)致使FACHB-469的TB-EPS中出现了类富里酸物质。两种铜绿微囊藻与Cd(Ⅱ)的反应都是自发的放热反应,氢键和范德华力在反应中起主要作用。 展开更多
关键词 毒铜绿微囊藻 胞外聚合物 荧光淬灭
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Effects of single-walled carbon nanotubes on growth and physiological characteristics of Microcystis aeruginosa 被引量:2
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作者 WU Yang WANG Ying-jun +3 位作者 LI Yuan-wei DU Jin-ge WANG Zhang-hong DENG Shi-huai 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第7期1628-1641,共14页
In order to explore a novel and potential method using carbon nanotubes (CNTs) for controlling blue-green algal blooms efficiently in future, effects of single-walled carbon nanotubes (SWCNTs) on Microcystis aerug... In order to explore a novel and potential method using carbon nanotubes (CNTs) for controlling blue-green algal blooms efficiently in future, effects of single-walled carbon nanotubes (SWCNTs) on Microcystis aeruginosa growth control were investigated under lab cultured conditions. Related physiological changes were tested involving several important enzyme of antioxidant defense system (superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), malondiadehyde (MDA), photosynthetic pigments, protein, soluble sugar and extracellular microcystin toxins (MC-LR)). Algal cell density was significantly inhibited by SWCNTs at high concentration (〉5.00 mg/L), and the inhibition rate was dose-dependent. For treatment with 100 mg/L SWCNTs, the inhibitory rates even reached above 90%. 96 h IC50 was determined as 22 mg/L. Antioxidant enzyme activities were dramatically dropped with increasing lipid peroxidation at higher SWCNTs concentration, indicating intracellular generation of reactive oxygen species (ROS) and oxidative stress damage in algae. Reduction of photosynthetic pigments, soluble sugar and protein contents suggested that SWCNTs may severely ruin algal photosynthesis system, destroy the metabolism-related structure of cell, and thus lead to negative physiological status in M. aeruginosa. Besides, SWCNTs can effectively decrease the amount of extracellular microcystins in culture medium. 展开更多
关键词 single-walled carbon nanotubes Microcystis aeruginosa microcystin toxin GROWTH
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Survival,recovery and microcystin release of Microcystis aeruginosa in cold or dark condition 被引量:4
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作者 丁奕 甘南琴 +3 位作者 刘津 郑凌凌 李林 宋立荣 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2017年第2期313-323,共11页
Microcystis often dominates phytoplankton in eutrophic lakes and must survive a long period of cold or dark conditions. However, the survival strategies of Microcystis to withstand cold or dark stress are less well kn... Microcystis often dominates phytoplankton in eutrophic lakes and must survive a long period of cold or dark conditions. However, the survival strategies of Microcystis to withstand cold or dark stress are less well known. In this study, we conducted experiments on the responses of two toxic Microcystis aeruginosa strains (FACHB-905 and FACHB-915) and their microcystin release in conditions of low temperature (15℃ or 4℃, with illumination) or darkness, and subsequent recovery in standard conditions (25℃ with illumination). On exposure to 15℃, a small decrease in cell viability was observed, but the cell number increased gradually, suggesting that M. aeruginosa FACHB-905 and FACHB-915 cells seem in general tolerant in 15℃. Interestingly, our results show that a higher carotenoid content and microcystin release potentially enhance the fitness of surviving cells at 15℃. M. aeruginosa cells exposed to lower temperature light stress (4℃) did not completely lose viability and retained the ability to reinitiate growth. In darkness, the maximum quantum yield (Fv/Fm) and the maximum electron transport rate (ETRmax) values and cell viability of M. aeruginosa cells gradually decreased with time. During the recovery period, the photosynthetic efficiency of M. aeruginosa reverted to the normal level. Additionally, M. aeruginosa FACHB-905 and FACHB-915 exposed to low temperature had increased caspase-3-1ike activity and DNA fragmentation, which suggests the occurrence of a type of cell death in M. aeruginosa cells under cold stress similar to programmed cell death. Overall, our findings could confer certain advantages on the Microcystis for surviving cold or dark conditions encountered in the annual cycle, and help explain its repeated occurrence in water blooms in large and shallow lakes. 展开更多
关键词 Microcystis aeruginosa MICROCYSTIN low temperature DARKNESS Caspase-3-1ike activity DNA fragmentation
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Factors Affecting the Occurrence and Growth of Toxic Cyanobacteria Microcystis Aeruginosa in Laguna De Bay, Philippines
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作者 C.A.M. Rosales A.P. Rollon 《Journal of Environmental Science and Engineering》 2011年第9期1109-1116,共8页
Cyanobacteria is one of the major sources of toxins in freshwater. These microorganisms are highly adaptive to changing environmental conditions. In this study, the occurrence of toxin producing cyanobacteria in Lagun... Cyanobacteria is one of the major sources of toxins in freshwater. These microorganisms are highly adaptive to changing environmental conditions. In this study, the occurrence of toxin producing cyanobacteria in Laguna de Bay and factors affecting its occurrence and growth were determined. The presence ofMicrocystis aeruginosa was positively correlated with nitrate (NO3) and iron (Fe^2+) with correlation coefficient of +0.72972 and +0.91063, respectively. It is negatively correlated with occurrence of sunshine (in days) and turbidity with correlation -0.79055 and -0.93531, respectively. 展开更多
关键词 Microcystis aeruginosa CYANOBACTERIA growth factors Laguna de Bay
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Aquatic Toxicities of Three Aryloxyphenoxypropanoic Acid Herbicides on Cyanobacterium Microcystis aeruginosa
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作者 Jing Ye Zhihao Qiu Yuping Du Aihua Shang 《Journal of Environmental Science and Engineering(B)》 2014年第2期79-86,共8页
Pesticides will be released into aquatic systems after application in agriculture or industry. AOPPs (aryloxyphenoxypropanoic acids) herbicides, including fenoxaprop, quizalofop-P-ethyl and haloxyfop-methyl, can pos... Pesticides will be released into aquatic systems after application in agriculture or industry. AOPPs (aryloxyphenoxypropanoic acids) herbicides, including fenoxaprop, quizalofop-P-ethyl and haloxyfop-methyl, can pose aquatic toxicity on cyanobacterium M. aeruginosa (Microcystis aeruginosa). The inhibition percentages of the biomass of M. aeruginosa exposure to 10 mg'L-I fenoxaprop, quizalofop-P-ethyl and haloxyfop-methyl on day 7 were 23.13%, 7.55%, and 7.56%, respectively. Protein content was also inhibited by the three AOPPs to fenoxaprop is the most toxic, followed by quizalofop-P-ethyl varying degrees. The growth and protein content results showed that and haloxyfop-methyl. It indicates that both the biomass and the protein content can be served as an indicator for evaluating the toxicity of the three chemicals. Growth rates of M. aeruginosa exposure to fenoxaprop are also the most significantly different compared to the control, which means that fenoxaprop is the most toxic among the three compounds. Results from this study may provide insights for evaluation of environmental risks of AOPPs. In addition, such insights will be helpful for guiding the application of AOPPs in agriculture. 展开更多
关键词 Herbicide AOPPs blue-green algae toxicology.
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