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1The anti-photooxidation of anthocyanins-rich leaves of a purple rice cultivar显示文摘In the leaf of rice (Oryza sativa L.) cultivar Yunnan purple rice,the anthocyanins with an obvious absorption peak at 530nm were distributed in the cells of upper and lower epidermis,bulliform tissue and bristle. The maximal photosynthetic oxygen evolution rate and chlorophyll content in flag leaves were 28% and 23%,respectively,more than the common green leaf rice cultivar Chijiaoru-anzhan. Higher chlorophyll content is probably one of the physiological adaptations for enhancing light harvesting capacity of the antenna in photosystems in this cyanic leaves species. Upon the photooxidation of leaf segments mediated by methyl viologen in weak light for 3 days,the distinct bleaching of anthocyanins in purple rice was associated with the reduction of scavenging ability to DPPH· free radical ability and the increase in membrane leakage rate. But almost no changes in contents of flavonoids and total phenolics were observed. Chlorophyll fluorescence parameters Fv/Fo,qP and φPSⅡ decreased with the increase in NPQ and DES of xanthophylls cycle after photooxidation treatment. Green rice leaves showed more decrease in DPPH· scavenging rate and more increase in cell membrane leakage rate but showed a trace of anthocyanins during photooxidation. It is sug-gested that anthocyanin may be a beneficial and primary antioxidant in sun cyanic rice leaves against oxidative stress induced by environmental adversity. And photooxidation could induce different changing patterns of anthocyanins between the tested purple and green rice leaves.PENG Changlian1,2,LIN Zhifang2,LIN Guizhu2 & CHEN Shaowei2 1. College of Life Science,South China Normal University,Guangzhou 510631,China 2. South China Botanical Garden,Chinese Academy of Sciences,Guangdong Key Laboratory of Digital Botanical Garden,Guangzhou 510650,China 2006Science China(Life Sciences)2006,49,6:14
2Soil respiration in tropical seasonal rain forest in Xishuangbanna, SW China显示文摘With the static opaque chamber and gas chromatography technique, from January 2003 to January 2004 soil respiration was investigated in a tropical seasonal rain forest in Xishuangbanna, SW China. In this study three treatments were applied, each with three replicates: A (bare soil), B (soil+litter), and C (soil+litter+seedling). The results showed that soil respiration varied seasonally, low from December 2003 to February 2004, and high from June to July 2004. The annual average values of CO2 efflux from soil respiration differed among the treatments at 1% level, with the rank of C (14642 mgCO2· m-2. h-1)>B (12807 mgCO2· m-2. h-1)>A (9532 mgCO2· m-2. h-1). Diurnal variation in soil respiration was not apparent due to little diurnal temperate change in Xishuangbanna. There was a parabola relationship between soil respiration and soil moisture at 1% level. Soil respiration rates were higher when soil moisture ranged from 35% to 45%. There was an exponential relationship between soil respiration and soil temperature (at a depth of 5cm in mineral soil) at 1% level. The calculated Q1o values in this study,ranging from 2.03 to 2.36, were very near to those of tropical soil reported. The CO2 efflux in 2003was 5.34 kgCO2· m-2. a-1 from soil plus litter plus seedling, of them 3.48 kgCO2· m-2. a-1 from soil (accounting for 62.5%), 1.19 kgCO2· m-2. a-1 from litter (22.3%) and 0.67 kgCO2·m-2. a-1 from seedling (12.5%).SHA Liqing, ZHENG Zheng, TANG Jianwei, WANG Yinghong, ZHANG Yiping, CAO Min, WANG Rui, LIU Guangren, WANG Yuesi & SUN Yang Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China Graduate School of Chinese Academy of Sciences, Beijing 100039, China 2005Science China Earth Sciences2005,48,z1:12
3Whole fossil plants of Ephedra and their implications on the morphology,ecology and evolution of Ephedraceae (Gnetales)显示文摘Although there are many reports of fossil Ephedraceae,whole plant fossil record remains rare.Due to a lack of trust on partially preserved fossil materials,scholars working on molecular clock proposed a recent origin of Ephedra and cast doubt on the earlier origin time of Ephedraceae.To better the understanding on this interesting group,here we report whole plants of Ephedra hongtaoi sp.nov.(Ephedraceae,Gnetales) from the Yixian Formation (Early Cretaceous) in western Liaoning,China.These whole plants of Ephedra demonstrate clearly the characters of Ephedra,including shrubby growth habit,decussate branching pattern,and terminal ovuliferous unit with micropylar tube.The whole-plant preservation of the fossils provides more convincing fossil evidence of Early Cretaceous Ephedra,helps to resolve the controversy over the origin time of Ephedra,and sheds light on the whole plant morphology,growth habit,ecology and evolution of Ephedraceae.WANG Xin 1,2 & ZHENG ShaoLin 3 1 Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China 2 Fairy Lake Botanical Garden,Shenzhen 518004,China 3 Shenyang Institute of Geology and Mineral Resources,Shenyang 110034,China 2010Chinese Science Bulletin2010,55,15:12
4Changes in biodiversity and ecosystem function during the restoration of a tropical forest in south china显示文摘Tropical forests continue to vanish rapidly,but few long-term studies have ever examined if and how the lost forests can be restored.Based on a 45-year restoration study in south China,we found that a tropical rain forest,once completely destroyed,could not recover naturally without deliberate restoration efforts.We identified two kinds of thresholds that must be overcome with human ameliorative measures before the ecosystem was able to recover.The first threshold was imposed primarily by extreme physical conditions such as exceedingly high surface temperature and impoverished soil,while the second was characterized by a critical level of biodiversity and a landscape context that accommodates dispersal and colonization processes.Our three treatment catchments(un-restored barren land,single-species plantation,and mixed-forest stand)exhibited dramatically different changes in biodiversity and ecosystem functioning over 4 decades.The mixed forest,having the highest level of biodiversity and ecosystem functioning,possesses several major properties of tropical rain forest.These findings may have important implications for the restoration of many severely degraded or lost tropical forest ecosystems.REN Hai,LI ZhiAn,SHEN WeiJun,YU ZuoYue,PENG ShaoLin,LIAO ChongHui,DING MingMao & WU JianGuo 1 South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650,China 2 Institute of Ecology and Evolution,Zhongshan University,Guangzhou 510275,China 3 Guangdong Institute of Entomology,Guangzhou 510275,China 4 School of Life Sciences and Global Institute of Sustainability,Arizona State University,Tempe,AZ 85287,USA 2007Science China(Life Sciences)2007,50,2:9
5The synthesis of astaxanthin esters,independent of the formation of cysts,highly correlates with the synthesis of fatty acids in Haematococcus pluvialis显示文摘The compositions and contents of astaxanthin esters and fatty acids in four types of Haematococcus pluvialis cells were studied by HPLC and GC-MS. Results showed that the synthesis and accumulation of astaxanthin was independent of the formation of cysts, but was highly correlated with the synthesis and accumulation of fatty acids, though it is an well known phenomenon that the accumulation of astaxanthin is usually accompanied by the formation of cyst. The red cysts contain more than 30% of fatty acids, with 81% of the unsaturated fatty acids. Taken together, besides a resource of astaxanthin, H. pluvialis would be a good resource of valuable fatty acids.MIAO FengPing1,2, LU DaYan1, ZHANG ChengWu3, ZUO JinCheng4, GENG YaHong1, HU HongJun1 & LI YeGuang1, 1 Laboratory of Plant Biotechnology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China 2 Laboratory of Coastal Zone Bioresources, Yantai Institute of Costal Zone Research for Sustainable Development, Chinese Academy of Sciences, Yantai 264003, China 3 Institute of Hydrobiology, Jinan University, Guangzhou 510632, China 4 College of Life Science, Ludong University, Yantai 264025, China 2008Science China(Life Sciences)2008,51,12:5
6Polyphyly of the fern family Tectariaceae sensu Ching:Insights from cpDNA sequence data显示文摘Tectariaceae are a pantropical fern family of about 20 genera, among which 8 are distributed in China. The morphological distinctiveness of the family is widely recognized, yet relatively little systematic research has been conducted on members of Tectariaceae. Phylogenetic analyses of chloroplast DNA sequence data (rbcL and atpB) from 15 species representing all 8 genera in China were carried out under parsimony criteria and Bayesian inference. The phylogenetic reconstructions indicated that the fern family Tectariaceae as traditionally circumscribed are polyphyletic. Ctenitis, Dryopsis, Lastreopsis clustered with and should be included within the newly-defined Dryopteridaceae, and Pleocnemia is also tentatively assigned to it. A narrowly monophyletic Tectariaceae is identified, which includes Ctenitopsis, Hemigramma, Pteridrys, Quercifilix, and Tectaria. In the single rbcL analysis, Arthropteris clustered with the above-mentioned monophyletic Tectariaceae. Although further investigations are still needed to identify infrafamilial relationships within the monophyletic Tectariaceae and to redefine several problematic genera, we propose a working concept here that better reflects the inferred evolu- tionary history of this group.LIU HongMei1,2, ZHANG XianChun1, CHEN ZhiDuan1, DONG ShiYong3 & QIU YinLong4 1 State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China 2 Graduate University of Chinese Academy of Sciences, Beijing 100039, China 3 South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China 4 Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109-1048, USA 2007Science China(Life Sciences)2007,50,6:5
7Toxicological Assessment of Trans-resveratrol显示文摘Objective To evaluate toxicity and safety of trans-resveratrol(t-RSV).Methods For assays of acute toxicity,genetic toxicity,and sub-chronic toxicity,Ames test,mice bone marrow erythrocyte micronucleus,and mice sperm abnormality were performed.Results In the acute oral toxicity tests,maximum tolerable dose(15g/kg) in male and female Kunming mice showed no toxicological signs.For 90-d feeding of t-RSV at dosage range of 167-500 mg/(kg·d) in both male and female Sprague-Dawley rats,no noticeable toxicological effects were observed.Conclusion T-RSV has no acute toxicity and no genotoxicity,no harmful effects on the human body at the tested dosage range and thus resveratrol is safe for human consumption.ZENG Jian-guo1,3,HU Yi-xiu2,ZHANG Xiang-qian1 1.Natural Product Research Center,Hunan Agricultural University,Changsha 410016,China 2.Toxicological Laboratory,Hunan Provincial Center for Disease Control and Prevention,Changsha 410005,China 3.Hunan Engineering Research Center of Botanical Extract,Changsha 410331,China 2010Chinese Herbal Medicines2010,2,1:4
8Thermostability of photosynthesis in two new chlorophyll b-less rice mutants显示文摘Leaves of the two new chlorophyll b-less rice mutants VG28-1, VG30-5 and the wild type rice cv. Zhonghua 11 were subjected to temperatures 28, 36, 40, 44 and 48℃ in the dark for 30 min or gradually elevated temperature from 30℃ to 80℃ at 0.5℃/min. The thermostability of photosynthetic apparatus was estimated by the changes in chlorophyll fluorescence parameters, photosynthetic rate and pigment content, chloroplast ultrastructure and tissue location of H2O2 accumulation. There were different patterns of Fo-temperature curves between the Chl b-less mutants and the wild type plant, and the temperature of Fo rising threshold was shifted 3℃ lower in the Chl b-less mutants (48℃) than in the wild type (51℃). At temperature up to about 45℃, chloroplasts were swollen and thylakoid grana became misty accompanied with the complete loss of photosynthetic oxygen evolution in the two Chl b-less mutants, but chloroplast ultrastruc- ture in the wild type showed no obvious alteration. After 55℃ exposure, the disordered thylakoid and significant H2O2 accumulation in leaves were found in the two Chl b-less mutants, whereas in the wild type plant, less H2O2 was accumulated and the swollen thylakoid still maintained a cer- tain extent of stacking. A large extent of the changes in qP, NPQ and Fv/Fm was consistent with the Pn decreasing rate in the Chl b-less mutants during high temperature treatment as compared with the wild type. The results indicated that the Chl b-less mutants showed a tendency for higher thermosensitivity, and loss of Chl b in LHC II could lead to less thermostability of PSII structure and function. Heat damage to photosynthetic apparatus might be partially attributed to the in- ternal oxidative stress produced at severely high temperature.LIN Zhifang1,PENG Changlian1,Xu Xinlan1,LIN Guizhu 1 & ZHANG Jingliu2 1.South China Institute of Botany,Chinese Academy of Sciences,Guangdong Key Laboratory of Digital Botanical Garden,Guangzhou 510650,China 2.National Key Laboratory of Plant Molecular Genetics,Institute of Plant Physiology & Ecology,Shanghai Institutes of Biological Sci- ences,Chinese Academy of Sciences,Shanghai 200032,China 2005Science China(Life Sciences)2005,48,2:4
9Cloning and expression pattern of a dehydrin-like BDNI gene from drought-tolerant Boea crassifolia Hemsl.显示文摘A 500-bp cDNA fragment was amplified via RT-PCR from drought-induced total RNA of the drought-tolerant B. crassifolia Hemsl. using primers based on the sequence of published dehydrin conserved region. By using 5’ RACE, full-length coding region (1 148 bp) of BDN1 gene was produced. It is a new member of the dehydrin gene family. Southern analysis indicated that BDN1 is present in the 6. crassifolia genome as a single-copy gene. Northern analysis revealed that its expression is inducible by drought and cold stresses as well as ABA application.ZHAO Huiwu, LIU Han, YU Haiyuan, HU Yuanlei, GAO Yin, LI Zhenyu & LIN ZhongpingNational Laboratory of Protein Engineering and Plant Genetic Engineering , Peking University, Beijing 100871, China Botanical Institute, Chinese Academy of Sciences, Beijing 100093, China Correspondence should be addressed to Lin Zhongping 2000Chinese Science Bulletin2000,45,22:3
10Urban niche dynamics of Kaifeng city显示文摘Niche theory is one of the most important ecological theories. It is widely applied to analyzing such phenomena as competition among, and evolution of, urban ecosystem func- tional modules. This paper describes a study concerning different functional modules of Kaifeng city urban ecosystem. Niche theory and techniques were used to analyze the changes of these functional modules in the period 1994–2003. The results showed that, in the period 1994–2003: (1) Niche value of the atmospheric environment and urban virescence modules increased, while niche value of the water environment and sound environment modules decreased; (2) niche value of the tertiary industry module increased, niche value of the secondary industry module decreased, while niche value of the primary industry module showed little change; and (3) niche value of the infrastructure, resource distribution, and production & social security modules increased, while niche value of the population module decreased. This study may contribute to macroscopic planning of urban functional modules, economic development, and environmental protection.Ding Shengyan1, Li Zhiheng1,2,3 1. College of Environment & Planning, Henan University, Kaifeng 475001, China 2. Xishuangbanna Tropical Botanic Garden, CAS, Kunming 650223, China 3. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 2007Journal of Geographical Sciences2007,17,2:2
11A New Diol from Dimocarpus longan Seeds显示文摘Objective To investigate the chemical constituents of Dimocarpus longan seeds in Sapindaceae.Methods The chemical constituents were isolated from the ethanol extract of D.longan seeds by silica gel column chromatography.Their structures were identified on the basis of physical and chemical properties and spectral analysis.Results One compound was isolated and identified as 2-methyl-1,10-undecanediol,named longandiol(1).Conclusion Compound 1 is a new compound.ZHENG Gong-ming1,2,XU Liang-xiong2,XIE Hai-hui2,WU Ping2,WEI Xiao-yi2 1.Guangdong Food and Drug Vocational College,Guangzhou 510520,China 2.South China Botanical Garden,the Chinese Academy of Sciences,Guangzhou 510650,China 2011Chinese Herbal Medicines2011,3,1:2
12Tsaokoin,a New Bicyclic Nonane from Amomum tsao-ko显示文摘7α-Hydroxy-8β,9β-H- cis- bicyclo[4,3,0]non-4-ene-4-aldehyde, a nonane compound with novel skeleton, named tsaokoin, was isolated from the fruits of Amomum tsao-ko. Its structure was established on the basis of spectral analysis.Qi Shi SONG1,2, Rong Wei TENG1, Xi Kui LIU1, Chong Ren YANG1* 1 Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204 2 Xishuangbanna Tropical Botanic Garden, Chinese Academy of Sciences, Kunming 650223 2001Chinese Chemical Letters2001,12,3:2
136英寸超高压直流输电用晶闸管显示文摘正如我们所看到的,随着中国社会的快速发展,大电力超远距离传输的需求迅速增长,用于高压直流输电工业的晶闸管的功率要求也越来越大。为此目的,ABB开发了一种6英寸、8.5 kV/4000A的晶闸管,该晶闸管具有良好的阻断特性、高dv/dt能力、以及所需的擎住灵敏性。可靠性研究表明,该晶闸管能够很好的经受住80℃、5000次的负载循环,并在90℃、1000小时的交流阻断中保持恒定的漏电流。Virgiliu Botan Jurg Waldmeyer Magnus Kunow Kranthi Akurati 张斌 2010电力电子2010,,5:2
14TWO NEW CONSTITUENTS FROM UVARIA MICROCARPA显示文摘TWO NEW CONSTITUENTS FROM UVARIA MICROCARPATWONEWCONSTITUENTSFROMUVARIAMICROCARPA¥YuPingLU;QingMU;HuiLanZHENG;ChaoMingLI(Labo...Yu Ping LU Qing MU Hui Lan ZHENG Chao Ming LI( Laboratory of Phytochemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming. 650204)(Xishuangbanna Tropical Botanic Garden, Chinese Academy of Sciences,Megla, Yunnan, 666303) 1995Chinese Chemical Letters1995,6,9:2
15Three dimensional simulation of liquid flow on distillation tray显示文摘Liu Botan Liu Chuniiang 2003Chinese J Chem Eng2003,10,5:1
16Report of a rapid biodiversity assessment at Cenwanglaoshan Nature Reserve,Northwest Guangxi,China,1999 and 2002显示文摘Kadoorie Farm and Botanic Garden 2003South China Forest Biodiversity Survey Report Series2003,27,:1
17Synthesis and characterization of LDHs/PMMA nanocomposites:Effect of two different intercalated anions on the mechanical and thermal properties显示文摘Nogueira T Botan R Wypych F 2012Journal of Applied Polymer Science2012,124,:1
18Mixed Mechanism of Lubrication by Lipid Bilayer Stacks 显示文摘Alexandru Botan Laurent Joly Nicolas Fillot 2015Lang- muir2015,31,12:1
19Modeling of Rayleigh convection in gas–liquid interfacial mass transfer using lattice Boltzmann method显示文摘Bo Fu Botan Liu Xigang Yuan Shuyong Chen Kuotsung Yu 2012Chemical Engineering Research and Design2012,,:1
20Intravenous Milk Thistle Compound Used to Save Victims of Poisonous Mushroom显示文摘American Botanical Council 0,,:1
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