检索结果-南通市图书馆

K~+channels inhibited by hydrogen peroxide mediate abscisic acid signaling in Vicia guard cells

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Cell Research 2001年第3期11卷 195-202页

作者： ZHANG XIAO, YU CHEN MIAO, GUO YONG AN, YUN ZHOU, ZHOU PING SHANGGUAN,JUN FENG GAO, CHUN PENG SONG college of life sciences, Norihwest Sci-Tech university of Agriculture and Forestry, Yangling 712100, china Department of Biology, Henan university, Kaifeng college of life sciences Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100 China. Department of Biology Henan University Kaifeng 475001 China. National Laboratory of Soil Erosion and Dryland Farming the Institute of Soil and Water Conservation Chinese Academy of Sciences Yangling 712100 China.

A number of studies show that environmental stress conditions increase abscisic acid (ABA) and hydrogen peroxide (H2O2) levels in plant cells. Despite this central role of ABA in altering stomatal aperture by regulating guard cell ion transport, little is known concerning the relationship between ABA and H2O2 in signal transduction leading to stomatal movement. Epidermal strip bioassay illustrated that ABA- inhibited stomatal opening and ABA-induced stomatal closure were abolished partly by externally added catalase (CAT) or diphenylene iodonium (DPl), which are a H2O2 scavenger and a NADPH oxidase inhibitor respectively. In contrast, internally added CAT or DPI nearly completely or partly reversed ABA-induced closure in half-stoma. Consistent with these results, whole-cell patch-clamp analysis showed that intracellular application of CAT or DPI partly abolished ABA-inhibited inward K+ current across the plasma membrane of guard cells. H2O2 mimicked ABA to inhibit inward K+ current, an effect which was reversed by the addition of ascorbic acid (Vc) in patch clamping micropipettes. These results suggested that H2O2 mediated ABA-induced stomatal movement by targeting inward K+ channels at plasma membrane.

关键词： Hydrogen peroxide abscisic acid K+ channels patch clamp vicia guard cell.

Research progress in genomics of environmental and industrial microorganisms

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(life sciences) 2009年第1期52卷 64-73页

作者： WANG Lei1,2,LIU Bin1,2 & ZHOU ZheMin1,2 1 TEDA School of Biological sciences and Biotechnology,Nankai university,Tianjin 300457,china 2 Tianjin Research Center for Functional Genomics and Biochip,Tianjin 300457,china 1. TEDA School of Biological sciences and Biotechnology Nankai University Tianjin 300457 China 2. Tianjin Research Center for Functional Genomics and Biochip Tianjin 300457 China

Microbes contribute to geochemical cycles in the *** also play important roles in biodegradation and bioremediation of contaminated environments,and have great potential in energy conversion and *** to date,at least 150 genomes of non-pathogenic microbes have been sequenced,of which,the majority are bacteria from various environments or of industrial *** emerging field 'metagenomics' in combination with the high-throughput sequencing technology offers opportunities to discover new functions of microbes in the environment on a large scale,and has become the 'hot spot' in the field of environmental *** genomes of bacteria from various extreme environments,including high temperature,high and low pressure,and extreme acidic regions,have been sequenced by researchers in china,leading to the discovery of metabolic pathways,genetic functions and new enzymes,which are related to the niches those bacteria *** results were published in Nature,PNAS,Genome Research and other top international *** the meantime,several groups in china have started 'metagenomics' *** outcomes of these researches are expected to generate a considerable number of novel findings,taking Chinese researchers to the frontier of genomics for environmental and industrial microorganisms.

关键词： genomics microbiology and metagenomics

Proteomic screening of high-pH-stress proteins in cyanobacterium Synechocystis sp. Strain PCC 6803

在线全文

学校读者我要写书评

暂无评论

Proteomic screening of high-pH-stress proteins in cyanobacte...

Raising medium function of environmental engineering by using life rubbish to produce carpet turf

中国植物学会七十五周年年会

作者： Lifang Zhang~1 Haomeng Yang~1 Jia Hu~2 Suxia Cui~2 Fang Huang~(1*) (1.Key Laboratory of Photosynthesis and environmental Molecular Physiology,Institute of Botany,Chinese Academy of sciences,beijing 100093,china 2.college of life sciences,Capital Normal university,beijing 100037,china)

Cyanobacteria are ancient and the largest group of prokaryotes as judged by their widespread habitats,frequent abundance and morphological ***,the molecular adaptation mechanisms underlying in cyanobacterial cells is ...

关键词：

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

Journal of environmental sciences 2000年第4期12卷 498-505页

作者： DUO Li an, ZHAO Shu lan (college of Chemistry and Biology, Tianjin Normal university, Tianjin 300074, china) 天津师范大学天津 3 0 0 0 74

Abundant material with low cost was utilized to raise medium function of producing carpet turf by life rubbish. The results showed that the material used could strikingly raise water retentiveness and ventilating of medium. Through the determination of the effect of each growth index of several turfgrass, emergence density, plant height, root growth and individual plant′s net primary production were all positively related to the material′s amount mixed, showing that the mixture of material could promote turfgrass growth, further proving that the material used raised medium function of producing carpet turf by life rubbish and made most use of life rubbish resources. It provided a scientific base is for application of environmental engineering by using life rubbish to produce carpet turf. So the study had both important theoretic meaning and applied value.

关键词： life rubbish carpet turf medium function environmental engineering

Analysis of land use change and its driving force in the Longitudinal Range-Gorge Region

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2007年第S2期 10-20页

作者： LI ZhengHai~(1,4+) SONG GuoBao~(1,2) L HaiYan~3 BAO YaJing~1 GAO JiXi~4 WANG HaiMei~5 XU Tian~6 CHENG Yan~7 1 Institute of Bio-Resources and Environment,college of life Science,Dalian Nationalities university,Dalian 116600,china 2 college of Resources Science & Technology,Baijing Normal university,Baijing 100875,china 3 Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural sciences,Baijing 100081,china 4 Innovation Base of Regional Ecology,Chinese Research Academy of environmental sciences,beijing 100012,china s Inner Mongolia Municipality Observatory,Huhhot 010051,china 6 college of life sciences,Inner Mongolia university,Huhhot 010021,china 7 college of Ecological Environment,Inner Mongolia Agricultural university,Huhhot 010018,china

The research on land use degree,land use change rate as well as regional difference of various land use types in the southwest Longitudinal Range-Gorge Region(LRGR)has been carried out on the re- gional and county *** the view of social economy,we have also analyzed the driving mecha- nism of land use change and the corresponding spatial scopes of various driving forces in the research *** research result indlcetse that,on the regional scale,farmland,forest and grassland compose the main body of land use in the LRGR,and the structural change of land use shows that grassland declines sharply,farmland increases and forest keeps *** the county scale,the land use is characterized by that land use level is relatively low,and the land use degree,the comprehensive variation rate and the relative variation rate among different land use types still *** analysis,the land use changes in the LRGR are mainly driven by investment Intensity of manpower and physical resources,the social economic output level,the intensity of natural disasters disturbance and educa- tional level of ***,the regionalism exists in the influence scope of different driving force types.

关键词： land use land use degree land use change rate driving force Longitudinal Range-Gorge Region(LRGR)

The spatial and temporal distribution of microalgae in the South china Sea:evidence from GIS-based analysis of 18S rDNA sequences

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(life sciences) 2008年第12期51卷 1121-1128页

作者： LI LüYan1, HUANG QiaoJuan1, WU ShuHui1, LIN Duan2, CHEN JiaHui2 & CHEN YueQin1 1 Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory for Biocontrol, Sun Yat-Sen university, Guangzhou 510275, china 2 South china Sea environmental Monitoring Center, State Oceanic Administration, Guangzhou 510300,china 1. Key Laboratory of Gene Engineering of the Ministry of Education State Key Laboratory for Biocontrol Sun Yat-Sen University Guangzhou 510275 China 2. South china Sea environmental Monitoring Center State Oceanic Administration Guangzhou 510300 China

The purpose of this study was to estimate the spatial and temporal variation of microalgae in the South china Sea and to demonstrate the environmental factors controlling the diversity of microalgae by GIS (geographic information system)-based analysis of 18S rDNA sequences. Six 18S rDNA libraries were constructed from environmental samples collected at different sites in the study area, and more than 600 18S rDNA sequences were determined. The rDNA sequence data were then analyzed by DIVA-GIS software to display the spatial and temporal variation of phytoplankton’s composition. It was shown that the autotrophic eukaryotic plankton dominated over the heterotrophic cells in most of our clone libraries, and the dominating phytoplankton was Dinophyceae except for Bacillariophyta at the Xiamen harbor. The percentages of these two groups were controlled by water temperature and salinity. Our results also revealed that the species composition of Chlorophyta showed a close relationship with latitude, changing from Prasinophyceae at the high latitude to Trebouxiophyceae at the low latitude. Several newly classified picoplankton lineages were first uncovered in the South china Sea, including the pico-sized green alga Ostreococcus sp. and Picochlorum eukaryotum, and picobiliphytes, which was just discovered in 2007 with unknown affinities to other eukaryotes. Their spatial and temporal variation were also analyzed and discussed.

关键词： microalgae GIS-based analysis 18S rDNA South china Sea

Effects of dissolved organic matter from sewage sludge on the atrazine sorption by soils

在线全文

学校读者我要写书评

暂无评论

Science china(life sciences) 2005年第z1期48卷 57-66页

作者： LING Wanting, XU Jianming & GAO Yanzheng college of environmental and Natural Resource sciences, Zhejiang university, Hangzhou 310029, china college of Natural Resource and environmental sciences, Nanjing Agricultural university, Najing 210095, china college of environmental and Natural Resource sciences Zhejiang University Hangzhou 310029 China college of Natural Resource and environmental sciences Nanjing Agricultural University Najing 210095 China

The effects of dissolved organic matter (DOM), water soluble organic matter derived from sewage sludge, on the sorption of atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-trazine) by soils were studied using a batch equilibrium technique. Six paddy soils, chosen so as to have different organic carbon contents, were experimented in this investigation. Atrazine sorption isotherms on soils were described by the linear equation, and the distribution coefficients without DOM (Kd) or with DOM (Kd*) were obtained. Generally, the values of Kd*/Kd initially increased and decreased thereafter with increasing DOM concentrations of 0-60 mg DOC · L-1 in soil-solution system form. Critical concentrations of DOM (DOMnp) were obtained where the value of Kd* was equal to Kd. The presence of DOM with concentrations lower than DOMnp promoted atrazine sorption on soils (Kd* > Kd), whereas the presence of DOM with concentrations higher than DOMnp tended to inhibit atrazine sorption (Kd* < Kd). Interestingly, DOMnp for tested soils was negatively correlated to the soil organic carbon content* and the maximum of Kd*/Kd (i.e. Kmax) correlated positively with the maximum of DOM sorption on soil (Xmax). Further investigations showed that the presence of hydrophobic fraction of DOM evidently promoted the atrazine sorption on soils, whereas the presence of hydrophilic DOM fraction obviously tended to inhibit the atrazine sorption. Interactions of soil surfaces with DOM and its fractions were suggested to be the major processes determining atrazine sorption on soils. The results of this work provide a reference to the agricultural use of organic amendment such as sewage sludge for improving the availability of atrazine in soils.

关键词： dissolved organic matter (DOM), atrazine, sorption, soil, environment behaviour.

Identification of proteins involved in photo-hydrogen evolution

在线全文

学校读者我要写书评

暂无评论

Identification of proteins involved in photo-hydrogen evolut...

Spatial patterns in temperature sensitivity of soil respiration in china: Estimation with inverse modeling

中国植物学会七十五周年年会

作者： Mei Chen~1 Le Zhao~1 Suxia Cui~2 Jie Wang~3 Fang Huang~(1*) (1.Key Laboratory of Photosynthesis and environmental Molecular Physiology,Institute of Botany,Chinese Academy of sciences,beijing 100093,china 2.college of life sciences,Capital Normal university,beijing 100037,china 3 National Center of Biomedical Analysis,beijing,china)

The eukaryotic microalgae Chlamydomonas reinhardtii represents a model organism for biochemical and physiological studies of photosynthesis as well as photo-hydrogen *** order to explore the molecular insights underly...

关键词：

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 china(life sciences) 2009年第10期52卷 982-989页

作者： ZHOU Tao1,2, SHI PeiJun1,2, HUI DaFeng3 & LUO YiQi4 1 State Key Laboratory of Earth Surface Processes and Resource Ecology, beijing Normal university, beijing 100875, china 2 Academy of Disaster Reduction and Emergency Management, Ministry of Civil Affairs & Ministry of Education, beijing 100875, china 3 Department of Biological sciences, Tennessee State university, Nashville, TN 37209, USA 4 Department of Botany and Microbiology, university of Oklahoma, Norman, OK 73019, USA 1. State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing 100875 China 2. Academy of Disaster Reduction and Emergency Management Ministry of Civil Affairs & Ministry of Education Beijing 100875 China 3. Department of Biological sciences Tennessee State University Nashville TN 37209 USA 4. Department of Botany and Microbiology University of Oklahoma Norman OK 73019 USA

Temperature sensitivity of soil respiration (Q10) is an important parameter in modeling the effects of global warming on ecosystem carbon release. Experimental studies of soil respiration have ubiquitously indicated that Q10 has high spatial heterogeneity. However, most biogeochemical models still use a constant Q10 in projecting future climate change and no spatial pattern of Q10 values at large scales has been derived. In this study, we conducted an inverse modeling analysis to retrieve the spatial pattern of Q10 in china at 8 km spatial resolution by assimilating data of soil organic carbon into a proc-ess-based terrestrial carbon model (CASA model). The results indicate that the optimized Q10 values are spatially heterogeneous and consistent to the values derived from soil respiration observations. The mean Q10 values of different soil types range from 1.09 to 2.38, with the highest value in volcanic soil, and the lowest value in cold brown calcic soil. The spatial pattern of Q10 is related to environmental factors, especially precipitation and top soil organic carbon content. This study demonstrates that inverse modeling is a useful tool in deriving the spatial pattern of Q10 at large scales, with which being incorporated into biogeochemical models, uncertainty in the projection of future carbon dynamics could be potentially reduced.

关键词： temperature sensitivity Q10 soil respiration global warming inverse analysis