检索结果-南通市图书馆

Genomics,metagenomics,and microbial oceanography—A sea of opportunities

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2011年第4期54卷 473-480页

作者： FANG JiaSong 1,2 &ZHANG Li 3 1 state Key laboratory of Marine Geology,Tongji university,Shanghai 200092,China 2 College of Natural and Computational Sciences,Hawaii Pacific university,Kaneohe,HI 96744,USA 3state Key laboratory of Geological Processes and Mineral Resources,Faculty of Earth Sciences,China university of Geosciences,Wuhan 430074,China state Key laboratory of Marine Geology Tongji University Shanghai China College of Natural and Computational Sciences Hawaii Pacific University Kaneohe USA state Key laboratory of Geological Processes and Mineral Resources Faculty of Earth Sciences China University of Geosciences Wuhan China

Microbial oceanography is an emerging discipline resulted from the interaction,cross-fertilization and integration of life science and ocean *** oceanography integrates the principles of marine microbiology,microbial ecology and oceanography to study the role of microorganisms in the biogeochemical dynamics of natural marine *** application of genomics tools to study marine microbes is resulting in rapid advancements in microbial oceanography that has important implications in global carbon cycle,climate change,and ecosystem *** we review the application of genomics and metagenomics in microbial oceanography and suggest future directions in microbial oceanography research.

关键词： microbial oceanography genomics metagenomics genes biomass bacteria archaea eukarya phylogeny physiology metabolism ecology biogeochemistry microbiology ecosystem function

Study on attribute characterization for reservoir dynamic monitoring by seismic

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2008年第S2期51卷 218-225页

作者： CHEN XiaoHong1,3,LI JingYe2,3 & ZHAO Wei4 1 Key Lab of Geophysical Exploration of CNPC,China Petroleum university,Beijing 102249,China 2 Basin & Reservoir research Center,China Petroleum university,Beijing 102249,China 3 state Key laboratory of Petroleum Resource and Prospecting,China university of Petroleum,Beijing 102249,China 4 research Center of CNOOC,Beijing 100027,China Key Lab of Geophysical Exploration of CNPC China Petroleum University Beijing China state Key laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China Basin & Reservoir research Center China Petroleum University Beijing China research Center of CNOOC Beijing China

Study on characterizing reservoir parameters dynamic variations by time-lapse seismic attributes is the theoretical basis for effectively distinguishing reservoir parameters variations and conducting time-lapse seismic interpretation,and it is also a key step for time-lapse seismic application in real oil fields. Based on the rock physical model of unconsolidated sandstone,the different effects of oil saturation and effective pressure variations on seismic P-wave and S-wave velocities are calculated and analyzed. Using numerical simulation on decoupled wave equations,the responses of seismic amplitude with different offsets to reservoir oil saturation variations are analyzed,pre-stack time-lapse seismic attributes differences for oil saturation and effective pressure variations of P-P wave and P-S converted wave are calculated,and time-lapse seismic AVO (Amplitude Versus Offset) response rules of P-P wave and P-S converted wave to effective pressure and oil saturation variations are compared. The theoretical modeling study shows that it is feasible to distinguish different reservoir parameters dynamic variations by pre-stack time-lapse seismic information,including pre-stack time-lapse seismic attributes and AVO information,which has great potential in improving time-lapse seismic interpreta-tion precision. It also shows that the time-lapse seismic response mechanism study on objective oil fields is especially important in establishing effective time-lapse seismic data process and interpreta-tion scheme.

关键词： time-lapse seismic dynamic monitoring rock physical model pre-stack attribute Amplitude Versus Offset (AVO)

Evidences for involvement of endogenous cAMP in Arabidopsis defens responses to Verticillium toxins

在线全文

学校读者我要写书评

暂无评论

Cell research 2005年第8期15卷 585-592页

作者： Jing JIANG, Ling Wen FAN, Wei Hua WU* The state Key laboratory of plant Physiology & Biochemistry, College of Biological Sciences, China Agricultural university, Beijing 100094, China The state Key laboratory of plant Physiology & Biochemistry College of Biological Sciences China Agricultural University Beijing China

Although there were reports suggesting the involvement of endogenous cAMP in plant defense signaling cascades, there is no direct evidence supporting this notion yet and the detailed mechanism is unclear. In the present study, we have used pathogenic fungi Verticillium dahliae and Arabidopsis plants as a model system of plant-microb interaction to demonstrate the function of endogenous cAMP in Arabidopsis defense responses. Both V. dahliae inoculation and Verticillium toxins injection induced typical “wilt” symptoms in Arabidopsis seedlings. When either 8-Br-AMP (a membrane permeable cAMP analogue) or salicylic acid (SA) was applied to Arabidopsis, the plants became resistant to V. dahliae toxins. However, addition of 8-Br-AMP did not increase the resistance of Arabidopsis transgenic plants deficient in SA to the toxins, suggesting that cAMP might act upstream of SA in plant defense signaling pathway. Indeed, 8-Br-cAMP and forskolin, an activator of adenylyl cyclase, significantly stimulated the endogenous SA level in plants, whereas DDA, an inhibitor of adenylyl cyclase dramatically reduced toxin-induced SA increase. Both the endog- enous cAMP and SA increased significantly in Arabidopsis seedlings treated with toxins. Furthermore, transcription level of pathogenesis-related protein 1 gene (PR1) was strongly induced by both 8-Br-cAMP and the toxin treatment. Taken together, our data demonstrate that endogenous cAMP is involved in plant defense responses against Verticillium- secreted toxins by regulating the production of the known signal SA in plant defense pathway.

关键词： Arabidopsis thaliana Verticillium dahliae cyclic AMP alicylic acid signal transduction defense response.

PRINCIPLES OF RIVER TRAINING AND MANAGEMENT

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Sediment research 2007年第4期22卷 247-262页

作者： Zhaoyin WANG1, Shimin TIAN2, Yujun YI3, and Guoan YU4 1 Prof., state Key laboratory of Hydroscience and Engineering, Tsinghua university, Beijing, 100084, China 2 Ph. D., China Institute of Water Resources and Hydro-Power research, Beijing 100044, China. 3 Ph. D., state Key laboratory of Hydroscience and Engineering, Tsinghua university, Beijing, 100084, China 4 Ph. D., state Key laboratory of Hydroscience and Engineering, Tsinghua university, Beijing, 100084, China state Key laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China China Institute of Water Resources and Hydro-Power research Beijing 100044 China

River regulation and river training have been performed for various purposes and negative effects have been shown in numerous cases. In some cases the negative effects are so serious that humans have to consider to "renaturalize" the regulated rivers. Only by using the strategy of integrated river management the diverse river uses and natural fluvial processes and ecological systems may be harmonized. Based on analysis of case studies and data collected from literatures this paper presents the concept of integrated river management and four principles of river training. The integrated river management comprises: 1) taking the watershed, upper stream basin including the tributaries, middle and lower reaches and the estuary as an integrated entity in the planning, design and management; and 2) mitigating or controlling the negative impacts on hydrology, erosion and sedimentation, fluvial processes, land use and river use, environment and ecology while in achieving economic benefit from water resources development, flood safety management and hydropower exploitation. River training and management should be in accordance with the four principles: 1) extending the duration of river water flowing on the continent, which may be achieved by extending the river course or reducing the flow velocity; 2) controlling various patterns of erosions and reducing the sediment transportation in the rivers; 3) increasing the diversity of habitat and enhancing the connectivity between the river and riparian waters; and 4) restoring natural landscapes.

关键词： River training Integrated river management Sediment Erosion control Ecological and landscape restoration

Large-eddy simulation of formation of three-dimensional aeolian sand ripples in a turbulent field

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(Physics,Mechanics & Astronomy) 2008年第8期51卷 945-960页

作者： WU ChuiJie1,WANG Ming2 & WANG Liang3 1 state Key laboratory of Structural Analysis for Industrial Equipment,Dalian university of Technology,Dalian 116024,China 2 Yellow River Institute of Hydraulic research,Zhengzhou 450003,China 3 research Center for Fluid Dynamics,Science School,PLA university of Science and Technology,Nanjing 211101,China state Key laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian China Yellow River Institute of Hydraulic research Zhengzhou China research Center for Fluid Dynamics Science School PLA University of Science and Technology Nanjing China

With the method of large-eddy simulation,the equation of spherule motion and the method of immersed boundary condition,numerical simulations of three-dimen-sional turbulent aeolian motion and the formation of sand ripples under three-di-mensional turbulent wind and the mutual actions of saltation and creeping motion were carried out. The resulting sand ripples have the form that is flat on the upwind side and steep on the leeward,which is identical to the sand ripples in nature. We also realized the self-restoration process of three-dimensional sand ripples,which shows the correctness of the method of numerical simulation and the models of saltation and creeping. Finally,We analyzed the influence of sand ripples on the three-dimensional turbulent wind field,and found that due to the appearance and development of sand ripples,in the normal direction of ground there exists stronger energy exchange,and moreover,there is close correspondence between the forms of sand ripples and the vorticity close to the ground surface.

关键词： large-eddy simulation equation of spherule motion sand ripples saltation creep

Design of a 400 N and 12 mm Mechanical Air Gap High Temperature Superconducting Linear Synchronous Motor

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2011年第S3期40卷 319-321页

作者： Yen Fei1,2,3, Li Jing1,2,3, Zheng Shijun1,2,3, Jiang Donghui1,2,3, Liu Lu1,2,3, Liu Wei1,2,3, Ma Guangtong1,2,3, Wang Jiasu1,3, Wang Suyu1,3 1 Applied Superconductivity laboratory, Southwest Jiaotong university, Chengdu 610031, China 2 state Key laboratory of Traction Power, Southwest Jiaotong university, Chengdu 610031, China 3 National laboratory for Rail Transit, Chengdu 610031, China SW Jiaotong Univ Appl Superconduct Lab Chengdu 610031 Peoples R China SW Jiaotong Univ State Key Lab Tract Power Chengdu 610031 Peoples R China Natl Lab Rail Transit Chengdu 610031 Peoples R China

The static thrust output on a superconducting coated conductor coil at different excitation and alternating current suspended above a three phase alternating current long-stator comprised of copper coils is presented. Excitation current up to 45 A was applied through the superconducting coil acting as the excitation system of the superconducting linear synchronous motor (SLSM), alternating current up to 9 A was applied to the armature and magnetic air gaps of 10 and 15 mm were investigated for four different cases; coreless, with an iron core or yoke and both a core and yoke. By scaling up and converting the studied superconducting single pancake racetrack coil into a double pancake coil and connecting four of such coils in series, an SLSM prototype capable of generating 400 N of thrust output and 1 kW of power output with a 12 mm mechanical air gap operating at 77 K is proposed.

关键词： high temperature superconductivity linear synchronous motor long stator motor superconducting coil force measurements

On the number of rotation symmetric Boolean functions

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2010年第3期53卷 537-545页

作者： FU ShaoJing1, LI Chao1,2 & QU LongJiang1,3 1Science College of National university of Defense Technology, Changsha 410073, China 2state Key laboratory of Information Security, Beijing 100039, China 3National Mobile Communications research laboratory, Southeast university, Nanjing 210096, China Science College of National university of Defense Technology Changsha China state Key laboratory of Information Security Beijing China National Mobile Communications research laboratory Southeast University Nanjing China

Rotation symmetric Boolean functions (RSBFs) have been used as components of different cryptosystems. This class of functions are invariant under circular translation of indices. In this paper, we investigated balanced RSBFs and 1st order correlation immune RSBFs. Based on constructive techniques, we give an accurate enumeration formula for n-variable balanced RSBFs when n is a power of a prime. Furthermore, an original and efficient method to enumerate all n-variable (n prime) 1st order correlationimmune functions is presented. The exact number of 1st order correlation immune RSBFs with 11 variables is 6925047156550478825225250374129764511077684773805520800 and the number of 13 variables has 189 digits. Then for more variables, we also provide a significant lower bound on the number of 1st order correlation immune RSBFs.

关键词： cryptography rotation symmetry correlation immunity balancedness

Anti-inflammatory effects of a novel peptide designed to bind with NF-κB p50 subunit

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2006年第11期27卷 1474-1478页

作者： Zhen-ping WANG~2 Shao-xi CAI~(2,4)Dong-bo LIU~3 Xiang XU~3 Hua-ping LIANG~3 2 Bioengineering College,Chongqing university,Chongqing 400044,China 3 state Key laboratory of Trauma,Burns and Combined Injury,Department 1,research Institute of Surgery,Daping Hospital,Third Military Medical university,Chongqing 400042,China Bioengineering College Chongqing University Chongqing China Department 1 State Key Laboratory of Trauma Burns and Combined Injury Research Institute of Surgery Daping Hospital Third Military Medical University Chongqing China

Aim:To explore the anti-inflammatory effects of a novel peptide designed to bindwith the NF-κB p50 ***:The affinity of the peptide binding withp50 was measured with a *** of tumor necrosis factor-α(TNF-α)and interleukin 6(IL-6)from a human acute monocytic leukemia cell line(THP-1)treated with lipopolysaccharide(LPS)were measured using the ELISA method,Invivo anti-inflammatory effects of the peptide were tested with phorbol myristateacetate(PMA)-induced ear edema and zymosan A-induced peritonitis in ***:The peptide has the ability to interact with the NF-κB p50 subunit andcan effectively inhibit TNF-α and IL-6 production in the THP-1 cell line,PMA-induced ear edema and zymosan A-induced peritonitis in ***:Thepeptide may have therapeutic potential for the treatment of local acute inflammation.

关键词： NF-kB anti-inflammatory agents cytokines

Scale correlation between vegetation and soil in larch forest, NE China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2001年第1期13卷 51-57页

作者： MA Ke ming 1, ZU Yuan gang 2, Michel Godron 3 (1. Reserch Center for Eco Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. E mail: mkm@*** 2. Open research laboratory of Forest plant Ecology, Northeast Fo research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China. E-mail:[email protected] Open research laboratory of Forest plant Ecology Northeast Forest University Harbin 150040 China CCAS La Graineterie 18410 Brinon France

After the analysis on the linages of species, the fractal dimensions of vegetation and soil in a managed larch(Larix gmelini) forest in Daxingan Mountains, NE China were estimated separately, and their scale correlation was discussed. (1) The dominant species of the larch forest, larch and the important accompany species, birch (Betula platyphylla) were homogeneously distributed along the transect. The other species were heterogeneous, and can be divided into three groups located on the right, left and central parts of the transect respectively. The transect can be separated into two parts at the position for the 29th quadrat(580m). (2) The fractal dimension in the large scale range from 200 to 400m was lower than that in the small scale range from 0 to 200m in the forest, indicating the different variation regularities of spatial heterogeneity in different scale ranges. The inflection point at 200m was one of the key scales of spatial hierarchy of the larch forest. (3) The scale variation of the forest was correlated with that of soil pH on large scales, which reflected the indirect control of the dominant species to the spatial pattern and species distribution of understorey by changing soil acidity in the forest and the indirect effects of forest management.

关键词： fractal dimension larch forest scale variation soil spatial heterogeneity species linkX