检索结果-南通市图书馆

Improving photosynthesis of microalgae by changing the ratio of light-harvesting pigments

2011 IEEE International Conference on Waste Recycling,Ecology and environment(ICWREE 2011)

作者： Shiyong SUN1 2* Faqin DONG1 Jia LUO3 Tingting HUO1 Lizhu LIU1 1Key Laboratory of Waste Solid Treatment and resource Recycle of Ministry of Education Mianyang Sichuan china 2school of environment and resource Southwest University of Science and Technology Mianyang Sichuan china 3 Department of Chemistry Monmouth University 400 Cedar Avenue West Long Branch NJ USA

the objective of this study is preparing a novel environmental friendly light weight magnetic sorbent consisting of bacteria and cobalt by chemical process to further cleaning crude oil spills in sea. The observations by ESEM indicated that a thin granular layer covered on the surface of model microorganism of Staphylococcus epidermildis which provided host for absorbing cobalt ions and depositing cobalt particulates. The results showed that composite present flower-like microspheres with large-scale yields. The high temperature treatment of amorphous bacteria composited cobalt microspheres showed that it well crystallized corresponding to Co3O4 at 800 °C. The microorganism composited magnetic sorbent opens an important alternation absorbent for timely oil spill cleanup.

关键词： Mircoorganism Magnetic sorbent Crude oil spill Cleanup Biomorphic mineralization

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science Bulletin 2005年第15期 88-92页

作者： WANG Gaohong1, CHEN Lanzhou2, LI Genbao1, LI Dunhai1, HU Chunxiang1, CHEN Haofeng1, LIU Yongding1 & SONG Lirong1 1. State Key Laboratory of Fresh Water Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, china 2. school of resource and environment Sciences, Wuhan University, Wuhan 430072, china

Changing the ratio of light-harvesting pigments was regarded as an efficient way to improve the photosyn-thesis rate in microalgae, but the underlying mechanism is still unclear. In the present study, a mutant of Anabeana simensis (called SP) was selected from retrieved satellite cul-tures. Several parameters related with photosynthesis, such as the growth, photosynthesis rate, the content of photosyn-thetic pigment, low temperature fluorescence spectrum (77K) and electron transport rate, were compared with those of the wild type. It was found that the change in the ratio of light-harvesting pigments in the mutant led to more efficient light energy transfer and usage in mutant than in the wild type. This may be the reason why the mutant had higher photosynthesis and growth rates.

关键词： photosynthesis microalgae light-harvesting pigments fluorescence emission electron transport rate.

Indeterminate direction relation model based on fuzzy description framework

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2008年第S1期51卷 72-80页

作者： LIU YaoLin1,HE JianHua1,YU Yan2 & TANG XinMing3 1 school of resource and environment Science,Wuhan University,Wuhan 430079,china 2 school of resource and environment Engineer,Wuhan University of Technology,Wuhan 430070,china 3 Chinese Academy of Surveying and Mapping,Beijing 10083,china school of resource and environment Science Wuhan University Wuhan China school of resource and environment Engineer Wuhan University of Technology Wuhan China Chinese Academy of Surveying and Mapping Beijing China

The indetermination of direction relation is a hot topic for fuzzy GIS researchers. The existing models only study the effects of indetermination of spatial objects,but ignore the uncertainty of direction reference framework. In this paper,first a for-malized representation model of indeterminate spatial objects is designed based on quadruple (x,y,A,μ),then a fuzzy direction reference framework is constructed by revising the cone method,in which the partitions of direction tiles are smooth and continuous,and two neighboring sections are overlapped in the transitional zones with fuzzy method. Grounded on these,a fuzzy description model for indeterminate direction relation is proposed in which the uncertainty of all three parts (source object,reference object and reference frame) is taken into account simultaneously. In the end,case studies are implemented to test the rationality and validity of the model.

关键词： direction relation fuzzy description framework fuzzy representation model uncertainty

Variation of peroxidase isoenzyme and biofilm of Phanerochaete chrysosporium in continuous membrane bioreactor for Reactive Brilliant Red X3-B treatment

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2009年第7期21卷 940-947页

作者： GAO Shang, CHEN Cheng, TAO Fang, HUANG Minsheng, MA Lihua, WANG Zhonghua, WU Linhui school of resource and environment Science, East china Normal University, Shanghai 200062, china. school of resource and environment Science East China Normal University Shanghai 200062 China

The influence of a Reactive Brilliant Red X-3B （RBR X-3B） dye on the peroxidase isoenzyme ofPhanerochaete chrysosporium was determined, and the biofilm structure in a white rot fungal continuous membrane bioreactor （MBR） was also investigated by scanning electron microscope （SEM）. The variation of peroxidase isoenzyme and the decolorization rate in the continuous MBR were evaluated. The results showed that the 100 mg/L RBR X-3B could stimulate the production of the peroxidase isoenzyme in the shaking-flask culture. In addition, two new peroxidase isoenzyme bands with relative mobility （Rf） value of 0.27 and 0.28 appeared, but the activity was lower than the blank control of 11 d. In the continuous MBR, the system worked stably during the first 60 d, the main peroxidase isoenzyme bands existed and three new bands with Rf value of 0.10, 0.27, and 0.28 appeared. Meanwhile, the biofilm grew well and the average decolorization rate could reach 90.6%. But the bands of peroxidase isoenzyme decreased rapidly at day 65, only two bands with Rf value 0.24 and 0.26 existed, and the decolorization rate decreased to 78.3%. Therefore, 5 bottles of P. chrysosporium mycelial pellet were added into the MBR, and then the activity of the peroxidase isoenzyme and the decolorization rate had a slight recovery. Finally, the decolorization rate finally decreased to 75.2%. These results contribute to a comprehensive understanding of the variation of peroxidase isoenzyme and biofilm in continuous MBR by white rot fungi.

关键词： Phanerochaete chrysosporium continuous membrane bioreactor Reactive Brilliant Red X3-B peroxidase isoenzyme pattern

A new method for mining deformation monitoring with GPS-RTK

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 659-664页

作者： GAO Jing-xiang1, 2, LIU Chao2, WANG Jian1, 2, LI Zeng-ke2, MENG Xiang-chao2 1. Key Laboratory for Land environment and Disaster Monitoring of State Bureau of Surveying and Mapping, china University of Mining and Technology, Xuzhou 221116, china 2. school of environment and Spatial Informatics, china University of Mining and Technology, Xuzhou 221116, china Key Laboratory for Land environment and Disaster Monitoring of State Bureau of Surveying and Mapping China University of Mining and Technology Xuzhou 221116 China school of environment and Spatial Informatics China University of Mining and Technology Xuzhou 221116 China

Based on ranging intersection theory, a new method which is simple and easy to operate was proposed for data collection in the mine surface deformation monitoring with GPS-RTK centering rod measurements. It can fully eliminate the inevitable shaking error and the vertical deflection, and to some extent weaken the multipath effect on the estimates of coordinates in a relatively short period of time, using high-frequency observations. The results show that three-dimensional coordinates with a height accuracy better than 1 cm, horizontal accuracy better than 2-4 cm can be achieved through only 15-30 s continuous observation by 20 Hz high-frequency and effectively improve the measurement accuracy and efficiency of RTK, fully satisfying the high-speed and high-precision data acquisition in mine surface subsidence deformation monitoring.

关键词： GPS rover pole multipath delay deformation monitoring

Phytotoxicity of four herbicides on Ceratophyllum demersum,Vallisneria natans and Elodea nuttallii

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2009年第3期21卷 307-312页

作者： PAN Huiyun,LI Xiaolu,XU Xiaohua,GAO Shixiang State Key Laboratory of Pollution Control and resource Reuse,school of the environment,Nanjing University,Nanjing 210093,china. State Key Laboratory of Pollution Control and resource Reuse School of the Environment Nanjing University Nanjing 210093 China

The physiological effects of 4 herbicides （butachlor, quinclorac, bensulfuron-methyl and atrazine） on 3 submerged macrophytes （Ceratophyllum demersum, Vallisneria natans and Elodea nuttallii） were tested in laboratory. The variables of the relative growth rate and the photosynthetic pigment content showed that all of the tested herbicides affected the growth of the plants obviously, even at the lowest concentration （0.0001 mg/L）. Except for the C. demersum treated with quinclorac at 0.005 and 0.01 mg/L, the relative growth rates of the plants were inhibited significantly （p 〈 0.01）. Statistical analysis of chlorophyll a （Chl-a） contents was carded out with both the t-test and one-way ANOVA to determine the difference between the treatment and control. The results showed that Chl-a contents of the plants in all treatment groups were affected by herbicides significantly, except for the C. demersum treated with bensulfuron-methyl at 0.0005 mg/L. The decrease in Chl-a content was positively correlated to the dosage of the herbicides in most treatment groups. It was suggested that herbicides in water bodies might potentially affect the growth of aquatic macrophytes. Since the Chl-a content of submerged macrophytes responded to the stress of herbicides sensitively and directly, it could be used as a biomaker in environmental monitoring or in the ecological risk assessment of herbicide contamination.

关键词： phytotoxicity herbicides submerged macrophyte ecological risk assessment

Resonance scattering spectral detection of ultratrace IgG using immunonanogold-HAuCl_4-NH_2OH catalytic reaction

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2008年第5期51卷 440-446页

作者： JIANG ZhiLiang1,2,ZHANG ShengSen1,LIANG AiHui2 & HUANG SiYu1 1 school of environment and resource,Guangxi Normal University,Guilin 541001,china 2 Department of Material and Chemical Engineering,Guilin University of Technology,Guilin 541001,china school of environment and resource Guangxi Normal University Guilin China Department of Material and Chemical Engineering Guilin University of Technology Guilin China

Nanogold particles of 10 nm were used to label goat anti-human IgG (GIgG) to obtain nanogold-labeled GIgG (AuGIgG). In a citrate-HCl buffer solution of pH 2.27,AuGIgG showed a strong catalytic effect on the reaction between HAuCl4 and NH2OH to form big gold particles that exhibited a resonance scatter-ing (RS) peak at 796 nm. Under the chosen conditions,AuGIgG combined with IgG to form immuno-complex AuGIgG-IgG that can be removed by centrifuging at 16000 r/min. AuGIgG in the centrifuging solution also showed catalytic effect on the reaction. On those grounds,an immunonanogold catalytic RS assay for IgG was designed. With addition of IgG,the amount of AuGIgG in the centrifuging solution decreased; the RS intensity at 796 nm (I796 nm) decreased linearly. The decreased intensity ΔI796 nm was linear with respect to the IgG concentration in the range of 0.08-16.0 ng·mL-1 with a detection limit of 0.02 ng·mL-1. This assay was applied to analysis of IgG in sera with satisfactory sensitivity,selectivity and rapidity.

关键词： immunonanogold nanocatalysis gold-enhancement resonance scattering assay IgG

Microwave photocatalytic degradation of Rhodamine B using TiO_2 supported on activated carbon:Mechanism implication

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2009年第2期21卷 268-272页

作者： HE Zhong,YANG Shaogui,JU Yongming,SUN Cheng State Key Laboratory of Pollution Control and resource Reuse,school of the environment,Nanjing University,Nanjing 210093,china. State Key Laboratory of Pollution Control and resource Reuse School of the Environment Nanjing University Nanjing 210093 China

The photocatalytic degradation of Rhodamine B （RhB） was carried out using TiO2 supported on activated carbon （TiO2-AC） under microwave irradiation. Composite catalyst TiO2-AC was prepared and characterized using X-ray diffraction （XRD）, transmission electron microscopy （TEM） and Brunauer-Emmett-Teller （BET）. In the process of microwave-enhanced photocatalysis （MPC）, RhB （30 mg/L） was almost completely decoloured in 10 min, and the mineralization efficiency was 96.0% in 20 min. The reaction rate constant of RhB in MPC using TiO2-AC by pseudo first-order reaction kinetics was 4.16 times of that using Degussa P25. Additionally, according to gas chromatography/mass spectrometry （GC/MS） and liquid chromatography/mass spectrometry （LC/MS） identification, the major intermediates of RhB in MPC included two kinds of N-de-ethylation intermediates （N,N-diethyl-N＇-ethyl-rhodamine （DER））, oxalic acid, malonic acid, snccinic acid, and phthalic acid, maleic acid, 3-nitrobenzoic acid, and so on. The degradation of RhB in MPC was mainly attributed to the destruction of the conjugated structure, and then the intermediates transformed to acid molecules which were mineralized to water and carbon dioxide.

关键词： microwave photocatalytic WiO2, activated carbon Rhodamine B degradation mechanism

RESEARCH ON HYDRODYNAMIC AND WATER QUALITY MODEL FOR TIDAL RIVER NETWORKS

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2003年第2期15卷 64-70页

作者： Xu Zu xin, Lu Shi qiang school of environment Science and Engineering, State Key Laboratory of Pollution Control and resource Reuse, Tongji University, Shanghai 200092, china Lab. of Pollution Control Sch. of Environ. Sci. and Eng. Tongji Univ. Shanghai 200092 China

Hydrodynamic and water quality model for tidal river network is set up withMIKE11 modeling system, according to the features of tidal river networks in plain area. The modelwas calibrated using the hydrological and water quality data of 1999, and the results show that thesimulated values agree with the measured data very well. This model is used to numerically analyzethe effects of low flow augmentation on hydrodynamic and water quality conditions of Suzhou *** simulation results show that the flow augmentation can increase net discharge of Suzhou Creekand improve its ability of re-aeration; and its concentration of dissolved oxygen in the rivernetworks can also increase correspondingly.

关键词： tidal river network water quality model suzhou creek low flow augmentation