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受毒素影响的三维竞争系统的最优控制问题 被引量:1
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作者 刘宇红 刘志美 《广西师范学院学报(自然科学版)》 2009年第1期43-45,共3页
将毒素输入率作为控制变量,研究了受毒素影响的由非线性剂量反应函数刻画的线性化三维竞争系统的最优控制问题,证明了在固定种群量附近该系统存在最优控制元.
关键词 毒素影响 三维竞争系统 剂量反应函数 最优控制元
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二维Volterra系统在毒素影响下的控制问题
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作者 刘志美 刘宇红 《广西师范学院学报(自然科学版)》 2006年第3期13-15,20,共4页
将毒素输入率作为控制变量,研究线性化二维Volterra系统在毒素影响下的最小范数控制问题,并证明了该系统存在最小范数控制元.
关键词 毒素影响 二维Volterra系统 最小范数控制元
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具有饱和项和毒素影响的互惠模型的周期解
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作者 吴梦君 《佳木斯大学学报(自然科学版)》 CAS 2013年第2期272-274,共3页
利用重合度拓展定理研究一类具有饱和项和毒素影响的互惠模型的周期正解问题.
关键词 互惠系统 重合度拓展定理 周期正解 饱和项 毒素影响
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具有毒素影响的二维Kolmogorov模型的持续生存和绝灭 被引量:1
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作者 刘宇红 刘志美 《生物数学学报》 CSCD 北大核心 2010年第2期308-312,共5页
研究了具有毒素影响的二维Kolmogorov模型,给出了该系统持续生存与绝灭的充分条件.
关键词 Kolmogorov模型 持续生存 绝灭 毒素影响
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两种前处理对酶联免疫法测定呕吐毒素结果影响的研究
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作者 王睿 《现代测量与实验室管理》 2012年第4期8-10,共3页
本文研究了两种前处理方法对酶联免疫法测定呕吐毒素含量结果的影响,希望能够尽量简化大批样品筛查时的检测过程。研究结果表明:简化法测定的结果与国标法测定的结果之间虽然存在差异,但是两组数据呈现较好的相关性,经过标准曲线校正后... 本文研究了两种前处理方法对酶联免疫法测定呕吐毒素含量结果的影响,希望能够尽量简化大批样品筛查时的检测过程。研究结果表明:简化法测定的结果与国标法测定的结果之间虽然存在差异,但是两组数据呈现较好的相关性,经过标准曲线校正后对检测结果的准确性影响不大。 展开更多
关键词 酶联免疫法 前处理 呕吐毒素结果影响
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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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Influencing Factors and Product Toxicity of Anthracene Oxidation by Fungal Laccase
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作者 LI Xuan-Zhen CHENG Qian +3 位作者 WU Yu-Cheng FENG You-Zhi LIU Wei-Wei LIN Xian-Gui 《Pedosphere》 SCIE CAS CSCD 2014年第3期359-366,共8页
The transformation profiles of polycyclic aromatic hydrocarbons (PAHs) by pure laccases from Trametes versicolor and Pycnoporus sanguineus, and the optimal reaction conditions (acetonitrile concentration, pH, tempe... The transformation profiles of polycyclic aromatic hydrocarbons (PAHs) by pure laccases from Trametes versicolor and Pycnoporus sanguineus, and the optimal reaction conditions (acetonitrile concentration, pH, temperature and incubation time) were determined. Anthracene was the most transformable PAH by both laccases, followed by benzo[a]pyrene, and benzo[a]anthracene. Laccase-mediator system (LMS) could not only improve the PAH oxidation but also extend the substrate types compared to laccase alone. 5e/0 or 10~ (v/v) of acetonitrile concentration, pH 4, temperature of 40 ~C, and incubation time of 24 h were most favorable for anthracene oxidation by laccase from T. versicolor or P. sanguineus. The gas chromatography-mass spectrometry analysis indicated that 9,10- anthraquinone was the main product of anthracene transformed by laccase from T. versicolor. Microtox test results showed that both anthracene and its laccase-transformation products were not acute toxic compounds, suggesting that laccase-treatment of anthracene would not increase the acute toxicity of contaminated site. 展开更多
关键词 laccase-mediator system polycyclic aromatic hydrocarbons Pycnoporus sanguineus reaction condition Trametes versicolor
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