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Preparation of TiO_2/Ti mesh photoelectrode and properties

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Journal of environmental Sciences 2003年第3期15卷 311-314页

作者： LIUHui-ling LIXuan-dong ZHOUDing LIXiang-zhong YUePing-tao Departmentofenvironmentalengineering HarbinInstituteofTechnologyHarbin15001China.E-mail:huilingliu2000@*** DepartmentofCivilandStructuralengineering TheHongKongPolytechnicUniversity.HungHomKomloonHongKong

An innovative photoelectrode, TiO_2/Ti mesh electrode, was prepared by anodisation. In anodisation, 0.5 mol/L H_2SO_4 was used as electrolytic solution, the current had been constantly 1A from the beginning of the oxidation until reaching a designed voltage. Results showed that the photocatalytic activity of electrode was better when the designed voltage was 160 V. The morphology and the crystalline texture of the TiO_2 film on mesh electrode were examined by scanning electronic microscopy and Raman spectroscopy respectively. The examination results indicated that the structure and properties of the film depended on anodisation rate, and the anatase was the dominant component under the controlled experimental conditions. Degradation of Rhodamine B in photocatalytic (PC) and photoelectrocatalytic (PeC) reaction was investigated.

关键词： mesh photoelectrode anodisation TiO_2 photoelectrocatalytic oxidation rhodamine B

Water Budget Analysis of Red Soils in Central Jiangxi Province, China

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Pedosphere 2004年第2期14卷 241-246页

作者： CHeNJia-Zhou HeYuan-Qiu CHeNMing-Liangt CollegeofResourcesandenvironment HuazhongAgriculturalUniversityWuhan430070（China）.E-mail：whcjz@263net InstituteofSoilScience ChineseAcademyofSciencesNanjing210008（China）

The daily soil water budgets in the red soil areas of central Jiangxi Province,southern China,were investigated with a large-scale weighing lysimeter and runoff plots. From 1998 to 2000,peanuts (Arachis hypogaea L.) and rape (Brassica napus L.) were planted in the lysimeter and in 1999,peanuts were planted in the runoff plots. The soil water budget components including rainfall,runoff,percolation and evapotranspiration were measured directly or calculated by Richards' equation and water balance equation. The results showed that most rainfall,including rainstorms,occurred from March to July,and induced the greatest soil water percolation during the year. The evapotranspiration was still large from July to September when rainfall was minimal. Thus,the lack of synchronization in soil water inputs and losses was disadvantageous to crops growing in this region. Among the soil water losses,percolation was the largest,followed by evapotranspiration,and then soil runoff. Runoff was very small on farmland with crops. It was significantly different from the uncultivated uplands where large-scale runoff was usually reported. The soil water storage fluctuated sinusoidally,with a large amplitude in the rainy season and a small amplitude in the dry season.

关键词： red soil runoff plot water budget weighing lysimeter

effects of MeK inhibitor U0126 on meiotic progression in mouse oocytes: microtuble organization, asymmetric division and metaphase Ⅱ arrest

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Cell Research 2003年第5期13卷 375-383页

作者： CHAO TONG, HeNG YU FAN, DA YUAN CHeN, XIANG FeN SONG, HeIDe SCHATTeN, QING YUAN SUNI 1 State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China. 2 Department of Veterinary Pathobiology, University of Missouri-Columbia, MO 65211, USA 1State Key Laboratory of Reproductive Biology Institute of Zoology Chinese Academy of Sciences Beijing 100080 China. E-mail: sunqy@*** 1State Key Laboratory of Reproductive Biology Institute of Zoology Chinese Academy of Sciences Beijing 100080 China. E-mail: sunqy@*** 1State Key Laboratory of Reproductive Biology Institute of Zoology Chinese Academy of Sciences Beijing 100080 China. E-mail: sunqy@*** 1State Key Laboratory of Reproductive Biology Institute of Zoology Chinese Academy of Sciences Beijing 100080 China. E-mail: sunqy@*** 2Department of Veterinary Pathobiology University of Missouri-Columbia MO 65211 USA. 1State Key Laboratory of Reproductive Biology Institute of Zoology Chinese Academy of Sciences Beijing 100080 China. E-mail: sunqy@***

In this study we used U0126, a potent and specific inhibitor of MeK, to study the roles of MeK/eRK/p90rsk signaling pathway in the meiotic cell cycle of mouse oocytes. The phosphorylation of MAP kinase and p90rsk in the oocytes treated with 1.5 μM U0126 was the same as that in oocytes cultured in drug-free medium. With 1.5 μM U0126 treatment, the spindles appeared normal as they formed in oocytes, but failed to maintain its structure. Instead, the spindle lost one pole or elongated extraordinarily. After further culture, some oocytes extruded gigantic polar bodies （>30 μm） that later divided into two small ones. Some oocytes underwent symmetric division and produced two equal-size daughter cells in which normal spindles formed. In oocytes with different division patterns, MAP kinase was normally phosphorylated. When the concentration of U0126 was increased to 15 mM, the phosphorylation of both MAPK and p90rsk were inhibited, while symmetric division was decreased. When incubating in medium c

关键词： kinases signal transduction oocyte development fertilization meiosis.

effects of red-yellow soil acidification on seed germination of Chinese pine

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Journal of environmental Sciences 2002年第1期14卷 115-119页

作者： TangHS WangRS ResearchCenterforeco－environmentalsciences ChineseAcademyofSciencesBeijing100085China.E－mail：tanghs@*** ResearchCenterforeco－environmentalsciences ChineseAcademyofSciencesBeijing100085

Acid treatments significantly change the physical and chemical properties of red yellow soil by lowering its pH value and leaching out aluminum(Al) ions that are harmful to the growth of plants. The structure of soil will be damaged, resulting in higher viscosity, higher water retention rate and lower air permeability of the soil. The germination rate of Chinese pine( Pinus tabulacformic Carr. ) seeds sowed in soil treated with sulphuric acid(H 2SO 4) decreased compared to that for untreated soil. The direct cause was the large amount of Al ions leached out because of low pH values(≥3.5). The added acid decreased the soil aggregation and increased the number of micro aggregates(under 250 μm in diameter). Such changes increased the soil's viscosity, which tied the pine needles to the soil after the seeds had germinated and prevented the seedlings from fully developing.

关键词： aluminum ion germination of Chinese pine red yellow soil soil aggregates soil viscosity

effects of butachlor on microbial enzyme activities in paddy soil

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Journal of environmental Sciences 2002年第3期14卷 413-417页

作者： MinH YeYF DepartmentofBiologyscience CollegeofLifeScienceZhejiangUniversityHangzhou310029China.E－mail：minhang@*** DepartmentofBiologyscience CollegeofLifeScienceZhejiangUniversityHangzhou310029China.

This paper reports the influences of the herbicide butachlor( n butoxymethl chloro 2', 6' diethylacetnilide) on microbial respiration, nitrogen fixation and nitrification, and on the activities of dehydrogenase and hydrogen peroxidase in paddy soil. The results showed that after application of butachlor with concentrations of 5.5 μg/g dried soil, 11.0 μg/g dried soil and 22.0 μg/g dried soil, the application of butachlor enhanced the activity of dehydrogenase at increasing concentrations. The soil dehydrogenase showed the highest activity on the 16th day after application of 22.0 μg/g dried soil of butachlor. The hydrogen peroxidase could be stimulated by butachlor. The soil respiration was depressed within a period from several days to more than 20 days, depending on concentrations of butachlor applied. Both the nitrogen fixation and nitrification were stimulated in the beginning but reduced greatly afterwards in paddy soil.

关键词： herbicide butachlor microbial enzyme activity paddy rice soil

An armed oncolytic adenovirus system, ZD55-gene, demonstrating potent antitumoral efficacy

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Cell Research 2003年第6期13卷 481-489页

作者： ZI LAI ZHANG, WeI Guo ZOU, CHUN XIA LUO, BING HUA LI, JIN HUI WANG, LAN YING SUN, QI JUN QIAN, XIN YUAN LIULaboratory of Biotechnology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China. e-mail: xyliu@*** eastern Heptobiliary Hospital, Second Military Medical University, Shanghai 200438, China 1Laboratory of Biotechnology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China. E-mail: xyliu@*** 1Laboratory of Biotechnology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China. E-mail: xyliu@*** 1Laboratory of Biotechnology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China. E-mail: xyliu@*** 1Laboratory of Biotechnology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China. E-mail: xyliu@*** 1Laboratory of Biotechnology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China. E-mail: xyliu@*** 1Laboratory of Biotechnology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China. E-mail: xyliu@*** 2eastern Heptobiliary Hospital Second Military Medical University Shanghai 200438 China 1Laboratory of Biotechnology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China. E-mail: xyliu@***

ONYX-015 is an attractive therapeutic adenovirus for cancer because it can selectively replicate in tumor cells and kill them. To date, clinical trials of this adenovirus have demonstrated marked safety but not potent enough when it was used alone. In this paper, we put forward a novel concept of Gene-ViroTherapy strategy and in this way, we constructed an armed therapeutic oncolytic adenovirus system, ZD55-gene, which is not only deleted of elB 55-kD gene similar to ONYX-015, but also armed with foreign antitumor gene. ZD55-gene exhibited similar cytopathic effects and replication kinetics to that of ONYX-015 in vitro. Importantly, the carried gene is expressed and the expression level can increase with the replication of virus. Consequently, a significant antitumoral efficacy was observed when ZD55-CD/5-FU was used as an example in nude mice with subcutaneous human SW620 colon cancer. Our data demonstrated that ZD55-gene, which utilizing the Gene-ViroTherapy strategy, is more efficacious than each ind

关键词： ZD55-gene oncolytic adenovirus elB 55-kD gene cancer Gene-ViroTherapy.

Comparison of Two Procedures for extraction and Clean-up of Organophosphorus and Pyrethroid Pesticides in Sediment

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Pedosphere 2004年第2期14卷 229-234页

作者： WANGLi-Gang JIANGXint YANDong-Yun S.FORSTeR D.MARTeNS InstituteofSoilScience ChineseAcademyofSciencesNanjing210008（China）.E-mail：lgwangO827@*** InstituteofecologicalChemistry NationalResearchG＇enterforEnvironmentandHealth.NeuherOerg85764（Germany）

Two procedures were compared for extraction and clean-up of 20organophosphorus and 19 pyrethroid pesticides in sediment to identify the more effective procedurefor groups of pesticides or individual compounds. In Procedure I, methanol/water and n-hexane wereused for extraction, and 1:10 (v/v) dichloromethane in n-hexane and acetone were used as eluents foreluting the analyte through the cartridge, with one evaporating steps on a rotary evaporator andtwo eluting steps on the cartridge. n-hexane/acetone (2:1, v/v) was used for extraction and elutionin Procedure II with one evaporating step on a rotary evaporator and one eluting step on thecartridge. All extractions were performed under an ultrasonic bath and gas chromatography and massspectrometry were utilized for measurements. Procedure II was developed as a rapid, timesaving, lesscostly and safer substitute for Procedure I which was an old method. Procedure II was moreeffective for almost all the organophosphorus pesticides tested and 11of the 19 pyrethroidpesticides, while Procedure I was more appropriate for analysis of 5 pyrethroid pesticides. However,recoveries of most pyrethroid pesticides were fairly low. Thus, further studies should focus onadjustment and formulation of solvents for more efficient extraction and clean-up of pyrethroidpesticides from sediment samples.

关键词： extraction procedure organophosphorus pesticides pyrethroid pesticides sediments

eco-toxicity of petroleum hydrocarbon contaminated soil

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Journal of environmental Sciences 2011年第5期23卷 845-851页

作者： Jingchun Tang Min Wang Fei Wang Qing Sun Qixing Zhou College of environmental Science and engineering Nankai University/Key Laboratory of Pollution Processes and Environmental Criteria Ministry of Education Tianjin 300071 China. E-mail: tangjch@***

Total petroleum hydrocarbons （TPH） contaminated soil samples were collected from Shengli Oilfield of China. Toxicity analysis was carried out based on earthworm acute toxicity, plant growth experiment and luminescent bacteria test. The soil was contaminated by- petroleum hydrogcarbons with TPH concentration of 10.57%. With lethal and sub-lethal rate as endpoint, earthworm test showed that the LD50 （lethal dose 50%） values in 4 and 7 days were 1.45% and 1.37% respectively, and the inhibition rate of earthworm body weight increased with higher oil concentration. TPH pollution in the soil inhibited seed germination in both wheat and maize experiment when the concentration of petroleum was higher than 0.1%. The eC50 （effective concentration 50%） for germination is 3.04% and 2.86% in maize and wheat, respectively. While lower value of eC50 for root elongation was to be 1.11% and 1.64% in maize and wheat, respectively, suggesting higher sensitivity of root elongation on petroleum contamination in the soil. The eC50 value in luminescent bacteria test was 0.47% for petroleum in the contaminated soil. From the experiment result, it was concluded that TPH content of 1.5% is considered to be a critical value for plant growth and living of earthworm and 0.5% will affect the activity of luminescent bacteria.

关键词： toxicity total petroleum hydrocarbon soil earthworm contamination

experimental evidence of magnetic training effect of electronic phase in Nd-Ca half-doped manganite

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Journal of Rare earths 2020年第10期38卷 1076-1085,I0002页

作者： Hamdi Trabelsi Corresponding author.e-mail address:hamdi.trabelsi@outlook.fr.Department of Physics Faculty of SciencesSfax UniversitySfax3000Tunisia

Cooling and heating modes are shown to be able to significantly modify the magnetic and electrical properties of the half-doped perovskite *** present paper reports on a precise investigation of this phenomenon(the so-called training effect) carried out on Nd0.5Ca0.5MnO3 manganite,which allow a fine tuning of the magnetic ground *** of the X-ray diffraction pattern shows that the synthesized sample is single phase and crystallizes in the orthorhombic structure with Pnma space *** magnetometry measurements,we have found that the sample is the seat of interesting phenomena like charge ordering,magnetic phase separation,spin-glass and inverse magnetocaloric ***-field-driven magnetization(M(μ0 H)) measurements evidence the metamagnetic transition which not only depends on field value,but also on the thermal process(cooling or heating).Metamagnetic irreversibility in the magnetic field range(±5 T) and memory effect are observed at low temperatures due to the kinetic arrest *** is worthwhile to mention that the coercive field increases with decreasing temperature and reaches 955 Oe at 20 K,which is sufficiently large compared with that one in the soft magnetic and makes the material quite interesting for spintronic *** electrical resistivity in a zero field was measured on both cooling and warming modes,and the data obtained were fitted by using different theoretical *** low temperatures,the resistivity shows the presence of insulator-metal transition and is found to be in conformity with the magnetization data.A magnetic training effect due to the thermo-magnetic history dependent behavior is observed,where the resistivity is consistently irreversible.

关键词： Pechini method Charge-ordering Inverse magnetocaloric effect Kinetic arrest Training effect electrical resistivity