检索结果-南通市图书馆

Adsorption and Uptake of Cadmium by Azolla pinnata:Kinetics of Inhibition by Cations

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 1995年第2期8卷 149-157页

作者： J.P.GAUR N.NORAHO LaboratoryofAlgalBiology CentreofAdvancedStudyinBotanyBanarasHinduUniversityVaranasi221005India Bo

A. pinnata showed a remarkable ability of taking up Cd from the external medium. Of the total Cd taken up by the test plant, surface adsorption was about 90%. Cd adsorption did not occur at a constant rate, however, an equilibrium was reached in 2 h. The uptake of Cd occurred at a constant rate. Test cations, including heavy metals (Ca, Mg, K, Na,Ni, Fe, Cu and Zn), inhibited adsorption as well as uptake of Cd. Cd adsorption was competitively inhibited by Cu, Fe and Zn, whereas Ca, Mg, K, Na and Ni caused non-competitive inhibition. Similarly, Cd uptake was competitively (Ca, Mg, Fe) or non-competitively (Na, K, Ni, Zn) inhibited by cations. Inhibition of Cd uptake by Cu was not wholly competitive

关键词： Adsorption and Uptake of Cadmium by Azolla pinnata

A New Triterpenoid from Teucrium Integrifolium

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第8期9卷 737-738页

作者： Xing Liang CHEN Tian En WANG Bei JIANG Zhong Wen LIN Han Dong SUN(G.i.h.. Academy of Science, Guiyang 550001)(department of Chemistry, Guizhou university, Guiyang 550025)(Laboratory of Phytochemistry, Kunming Institute of botany,Chinese Academy of Sc Guizhou Academy of Science Guiyang 550001 China department of Chemistry Guizhou University Guiyang 550025 China Laboratory of Phytochemistry Kunming Institute of Botany Chinese Academy of Science Kunming 650204 China

A new ursane-type triterpene, 3 beta-hydroxy-urs-5(6)-en-28-oic acid 1, was isolated from the aerial parts of Teucrium integrifolium and characterized. The structure of this new compound was mainly established by 2D N... 详细信息

关键词： Teucrium integrifolium labiatae ursane-type triterpenoid 3 beta-hydroxy-urs-5(6)-en-28-oic acid

Carbon isotope ratios of C_(4) plants in loess areas of North China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2006年第1期49卷 97-102页

作者： WANG Guoan1,2,3, HAN Jiamao 2, ZHOU Liping3, XIONG Xiaogang4, TAN Ming2, WU Zhenhai5 & PENG Jun6 1. department of Plant Nutrition, China Agricultural university, Beijing 100094, China 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 3. College of Environmental Sciences, MOE Laboratory for Earth Surface Processes, Peking university, Beijing 100871, China 4. Institute of botany, Chinese Academy of Sciences, Beijing 100093, China 5. Northwest Sci-Tech university.of Agriculture and Forestry, Yangling 712100, China 6. Network Center, China Agricultural university, Beijing 100094, China department of Plant Nutrition China Agricultural University Beijing China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China College of Environmental Sciences MOE Laboratory for Earth Surface Processes Peking University Beijing China Institute of botany Chinese Academy of Sciences Beijing China Northwest Sci-Tech university.of Agriculture and Forestry Yangling China Network Center China Agricultural University Beijing China

Carbon isotope ratios (δ^(13)C) of 89 C_4 plant samples were determined fromthe loess area in North China. δ^(13)C values vary between -10.5per thousand and -14.6per thousandwith a mean of -12.6per thousand. Along a precipitation gradient from the semi-moist area to thesemiarid area, then to the arid area, the δ^(13)C values of C_4 plants show a slight decreasingtrend. The δ^(13)C values of C_4 plants in the dry season are found lower than those in the wetseason. These trends are opposite to those observed for C_3 species.

关键词： C4 plants, carbon isotope ratios, loess area.

Hormonal coordination of cell polarity in the leaf epidermis

在线全文

学校读者我要写书评

暂无评论

Hormonal coordination of cell polarity in the leaf epidermis

Three New diterpenoids from Isodon Gesneroides

中国植物学会植物细胞生物学2010年学术年会

作者： Zhen-biao Yang~* Center for Plant Cell Biology,department of botany and Plant Sciences,university.of California,Riverside,CA 92521, usa.

Coordinate polarization of whole fields of cells in a tissue or organ is important for pattern formation and *** of coordinate cell polarity formation in plants include polar localization of the PIN auxin efflux carriers to one cell end in various tissues,polar formation of root hairs at the basal end of root epidermal cells,and interdigitation of the jigsaw-puzzle-shaped leaf pavement *** molecular mechanism for cell-cell coordination of polarity and the developmental signals that activate this coordination are poorly *** use Arabidopsis leaf epidermal pavement cells as a model system to investigate these *** have shown that pavement cell interdigitation is controlled by localized ROP GTPase signaling,which impinges on the organization of cortical actin microfilaments and microtubules to generate interdigitating lobes and *** recent studies indicate that the phytochormone auxin is a localized signal that activates pavement cell polarization to form lobes and coordinates lobe formation with indentation formation by activating ROP GTPase signaling through an Auxin-Binding Protein 1(ABP1) dependent cell surface-based auxin perception *** addition,auxin as acts as a global signal to coordinate the interdigitating pattern formation throughout the entire leaf through the well-established TIR1-based auxin signaling system. Therefore auxin is both local and global signals in coordinating cell morphogenesis in *** implication of a single signal acting at both cellular and tissue levels in development will be discussed.

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

Chinese Chemical Letters 1997年第8期8卷 705-706页

作者： Shao Nong CHEN Hong Jie ZHANG Zhong Wen LIN Yao Zu CHEN Han Dong SUN(department of Chemistry,Lanzhou Uinversity, Lanzhou, 730000)(Laboratory of Phytochemistry,Kunming Institute of botany, Academia Sinica,Kunming,650204)(department of Chemistry, Zhejiang department of Chemistry Lanzhou University Lanzhou 730000 China Laboratory of Phytochemistry Kunming Institute of Botany Academia Sinica Kunming 650204 China department of Chemistry Zhejiang University Hangzhou 310013 China

Three new diterpenoids, gesneroidins DP (1-3), were isolated from Isodon gesneroides. The structure was determined as 3 beta, 7 beta, 11 beta, 15 beta-tetraacetoxy-ent-kaur-16-en-6-one; 15 beta-hydroxy-1 alpha, 3 beta, 6 alpha, 7 beta, 11 beta-pentaacetoxy-ent-kaur-16-ene; 6 alpha,11 beta-dihydroxy-3 beta, 7 beta-diacetoxy-ent-kaur-16-en-15-one based on 1D and 2D NMR techniques (COSY, NOESY, HXTCOR, COLOC).

关键词： EIMS Three New diterpenoids from Isodon Gesneroides

Phylogenetic analysis of Toxicodendron(Anacardiaceae) and its biogeographic implications on the evolution of north temperate and tropical intercontinental disjunctions

在线全文

学校读者我要写书评

暂无评论

Journal of Systematics and Evolution 2009年第5期47卷 416-430页

作者： 1,2Ze-Long NIE 1Hang SUN 1Ying MENG 1,3,4Jun WEN 1(Key Laboratory of Biodiversity and Biogeography,Kunming Institute of botany,Chinese Academy of Sciences,Kunming 650204,China) 2(Graduate School of Chinese Academy of Sciences,Beijing 100049,China) 3(department of botany,National Museum of Natural History,Smithsonian Institution,Washington,DC 20013-7012,usa) 4(Key Laboratory of Systematic and Evolutionary botany,Institute of botany,Chinese Academy of Sciences,Beijing 100093,China) KeyLaboratoryofBiodiversityandBiogeography KunmingInstituteofBotanyChineseAcademyofSciencesKunming650204China GraduateSchoolofChineseAcademyofSciences Beijing100049China

Toxicodendron is a genus in the Rhus complex of Anacardiaceae with a disjunct distribution between eastern Asia and North America,extending to southeastern Asia and the ***(internal transcribed spacer,external transcribed spacer,and NIA-i3) and chloroplast(ndhF and trnL-F) sequences were used to construct phylogenetic relationships of *** analysis of these data strongly support Toxicodendron as a monophyletic group distinct from other genera of the Rhus complex,and the phylogeny does not fully corroborate classification at the sectional *** temperate disjunct lineages were detected,one from section Toxicodendron and the other between the eastern North American Toxicodendron vernix and the eastern Asian Toxicodendron *** divergence times were estimated to be 13.46(7.95-19.42) and 7.53(2.76-12.86) mya,*** disjunction between section Griffithii(taxa from warm temperate to tropical Asia) and Toxicodendron striatum(from the neotropics) was supported and their divergence time was estimated to be 20.84(11.16-30.52) mya in the early *** biogeographic results and the paleontological data support the Bering land bridge as the most likely route to explain the temperate disjunctions,yet the tropical disjunction in Toxicodendron seems to be best explained by the North Atlantic land bridge hypothesis.

关键词： Anacardiaceae biogeography disjunction eastern Asia neotropics North America phylogenetics Toxicodendron.

Very Low Genetic Diversity of American ginseng(Panax quinquefolius L.)Revealed by Inter-simple Sequence Repeats(ISSR)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Very Low Genetic Diversity of American ginseng(Panax quinque...

Studies on the mass spectrometry of natural products——V. Negative ion fast atom bombardment and collisional activation mass spectrometry in the structural analysis of oligoglycosides

第六届全国系统与进化植物学青年学术研讨会

作者： Zhou Shi-Liang Elizabeth A. Zimmer Wen Jun(Laboratoiy of Systematic & Evolutionary botany, Institute of botany, the Chinese Academy of Sciences, Beijing 100093 Laboratory of Molecular Systematics and department of botany, Smithsonian Institution, Washington D.C. 20560, usa department of Biology, Colorado State university, Fort Collins, Colorado 80523-1878, usa)

Genetic diversity in two populations of American ginseng(Panax quinquefolius L.)was assessed using inter-simplesequence repear(ISSR)*** simple primers were used to resolve the genetic *** primergenerated 1 repeatble bands on a 1.5% agarose gel.A total of 36 repeatable bands were scored,none of whichshowed any *** the 11 primers,two of them(ISS7 and ISSR814)shawed some ***,thebanding pattems of such variable bands were not consistently repeatable in further *** of the lack of

关键词： Araliaceae American ginseng genetic diversity, ISSR Panax quinquefolius L.

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

Chinese Journal of Chemistry 1987年第3期5卷 236-241页

作者： CHEN Neng-Yu CHEN Ning LI Hong CHEN Yao-Zu* ZHAO Fang-Zhi, department of Chemistry, Lanzhoa university, LanzhouCHEN Chang-Xiang YANG Chong-Ren, Kunming Institute of botany, Academia Sinica, Kunming department of Chemistry Lanzhou University Lanzhou Kunming Institute of botany Academia Sinica Kunming

The negative ion fast atom bombardment （NFAB） mass spectrometry of eight glycosidescontaining one to three sugar units have been studied. The mass spectra of NFAB exhibit morepredominant quasi-molecular ions without adduct ions in the high mass region, which indicate moreunambiguously the molecular weights of the glycosides, than the positive ion FAB （PFAB） spectrado. Among the three matrix substances tested, glycerol, thioglycerol and PEG-200, the last one wasfound to give the best results. The characteristic ions of NFAB collisional activation CNFAB-CA)spectra of [M-H]- ions were more abundant and gave more definite information about sequences ofthe sugar units than the corresponding PFAB-CA spectra of [M+H]+ions.

关键词： FAB Studies on the mass spectrometry of natural products Negative ion fast atom bombardment and collisional activation mass spectrometry in the structural analysis of oligoglycosides

Competition of the active roots of Cassia siamea Lam. and Zea mays L.(*** Composite B) in an alley cropping trial in semi arid Kenya

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 1999年第4期11卷 462-467页

作者： G.O.Umaya\+1, J.N.M.Macharia\+1, J.C.Onyango\+1,C.J.Stigter\+2, C.L.Coulson\+1 (1.department of botany, university.of Nairobi, P.O.Box 30197,Kenya 2. department of Meteorology, Wageningen Agricultural university, Duivendaal 2, 6701 AP Wageningen, The department of botany University of Nairobi P. O. Box 30197 Kenya department of Meteorology Wageningen Agricultural University Duivendaal 2 6701 AP Wageningen Netherlands

A study on root competition in alley cropping was carried out in an agroforestry system, involving Cassia siamea Lam. and maize ( Zea mays L. cv. Katumani composite B). The existence and intensity of root competition in the top soil as manifested by the distribution of the active roots of cassia and maize, in space and time, was assessed. The root length density of maize was far greater than that of cassia in the upper 10 cm, implying that cassia was not competing with maize for water and/or nutrients at that depth. However, at maize crop tasselling and grain filling stages there was a marked overlap of roots of the two plants at lower depths (20—50 cm). This varied with distance from the cassia hedge in a way that there was a tendency for highest overlap near middle maize rows. This partly explained observed yield differences. Therefore cassia may not be a suitable choice for alley cropping with maize under semi\|arid conditions on non\|sloping land, unless most of its active roots can be properly managed to absorb resources below the feeding rhizosphere of the active maize roots.

关键词： agroforestry Cassia siamea Zea mays root competition semi\|arid