作者：
Tang, C. F.;Zhang, R. Q.;Wen, S. Z.;Li, C. F.;Guo, X. F.;...
期刊：
Water Science and Technology,2009年59(8):1487-1493 ISSN：0273-1223
通讯作者：
Liu, Y. G.
作者机构：
[Tang, C. F.; Zhang, R. Q.; Liu, Y. G.; Wen, S. Z.] Cent S Univ Forestry & Technol, Coll Resources & Environm, Changsha 410004, Peoples R China.;[Li, C. F.] Inst Environm Protect Sci, Nanning 530022, Peoples R China.;[Guo, X. F.] Hunan Res Inst Nonferrous Met, Changsha 410015, Peoples R China.
通讯机构：
[Liu, Y. G.] C;Cent S Univ Forestry & Technol, Coll Resources & Environm, Changsha 410004, Peoples R China.
关键词：
cadmium;chemical forms;spermidine;subcellular distribution;Typha latifolia L
摘要：
The effects of foliar spraying with spermidine (Spd) on the subcellular distribution and chemical speciation of Cd in Typha latifolia L. in hydroponic system were investigated. Increased Cd concentration in the medium caused an increase of Cd concentration in all tissues and all subcellular fractions, with the highest Cd level occurring in roots, followed by rhizomes and leaves and the greatest accumulation was in cell walls, soluble fraction and organelle containing fractions ranked next, respectively. The greatest amount of Cd was found in the extraction of 1 mol.L-1 NaCl, followed by 2% HAC, deionized water, 80% ethanol, residues and the least in 0.6 mol.L-1 HCl. The subcellular distribution and different chemical forms of Cd both decreased after Spd application and were more inhibited by 0.25 than 0.50 mmol.L-1 Spd, especially in roots at 0.10 mmol.L-1 Cd treatment. It could be suggested that the retention of Cd in roots, cell walls binding with metal, metal ion compartmentation in vacuoles and Cd forms existing in undissolved and integrated with pectates and protein play an important role in Cd detoxification and Spd could enhance the tolerance of cattail to Cd stress.
作者机构：
[Wu Xiaofu; Zhao Fang; Chen Mingli; Ji Zhihui; Ma Qun] Cent S Univ Forestry & Technol, Inst Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, XF ] ;Cent S Univ Forestry & Technol, Inst Environm Sci & Engn, Shaoshan S Rd, Changsha 410004, Hunan, Peoples R China.
摘要：
Adsorption experiments of Zn2+ and Cd2+ ions from aqueous solutions onto vermiculite were conducted to test the applicability of two basic functions derived for calculating the change in the Gibbs' free energy (ΔG0) and the chemical potential (Δμ) between the initial and equilibrium states in ion adsorption systems. The functions were deduced on the basis of the thermodynamic principle that the chemical potentials of the reactants and products of a physicochemical reaction should be equal in the equilibrium state and, consequently, the change in the Gibbs' free energy between the initial and equilibrium states of the reaction should be equal to the sum of the initial molar quantity of each reactant multiplied by its change in chemical potential. The results of the analysis conducted indicate that the two functions considered could well be used not only for calculating ΔG0 and Δμ but also for determining the adsorption capacity of an adsorbent under the conditions considered.
摘要：
微生物是污水净化的主要作用者之一.采用变性梯度凝胶电泳(denaturing gradient gel electrophresis,DGGE)方法培育和鉴定土壤微生物具有可靠性强、重复性好、方便快捷等优点,已被广泛应用于环境科学和污染防治研究领域.综述了基于PCR-DGGE技术的基本原理、关键环节及其在微生物多样性研究中的应用,同时就其自身存在的不足进行了评价并提出了解决方案.
作者机构：
[Wu, Xiaofu; Zhao, Fang] Cent S Univ Forestry & Technol, Inst Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Zhou, Hailan] Hunan Acad Environm Protect, Changsha 410004, Hunan, Peoples R China.;[Zhao, Chong] Shandong Water Polytechn, Rizhao, Shandong, Peoples R China.;[Wu, Xiaofu] Cent S Univ Forestry & Technol, Inst Environm Sci & Engn, Shaoshan S Rd, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Xiaofu] C;Cent S Univ Forestry & Technol, Inst Environm Sci & Engn, Shaoshan S Rd, Changsha 410004, Hunan, Peoples R China.
摘要：
Studies of Zn2+ and Cd2+ ion adsorption onto vermiculite from buffered and unbuffered aqueous solutions were conducted in order to compare their ion adsorption behaviours in different systems. The use of buffer reagents had a strong and negative effect on the adsorption of the metal ions under study. The experimental data obtained from both the buffered and unbuffered solutions could not be described by a single traditional adsorption isotherm due to the effect of the adsorbent concentration (W). The equilibrium ion concentration in bulk solution (Z) and the equilibrium ion adsorption density (X/W ratio) decreased with increasing W in both buffered and unbuffered systems, indicating that the use of a buffer solution is not an effective measure for eliminating the effect of the adsorbent concentration. The addition of competitive ions (H+, Cd2+ and Zn 2+) greatly reduced the adsorption of the target metal ion. Within the pH range tested (initial pH < 7), the competitive effect of H+ ions was equivalent to that of Zn2+ and Cd2+ ions. In unitary, binary and ternary systems, highly significant linear correlations were obtained between the change in the ionic strength (ΔI) and the quantity of ion adsorption. The results obtained suggest that it is not necessary to control the ionic strength in ion adsorption experiments because ΔI is a function of ion adsorption, and the use of buffer reagents has a negative effect on ion adsorption.
摘要：
While seedlings of Radish raised in increasing contents of Cd2+ in hydroponic system, increment in ratio of superoxide dismutase (SOD)/catalase (CAT) and levels of superoxide anion (O2 .-) and lipid peroxides was observed; 125 μmol·L-1 Cd2+ treatment resulted in a gradual elevation in SOD activity; while at Cd2+ level of 250 and 500 μmol·L-1 SOD activity considerably increased at first, then declined to even lower than that of the control. CAT activity showed enhancement in leaves whereas decrease in roots. Cd2+ induced an obvious elevation in GR activity in both roots and leaves. A marked elevation in GR activity suggests that ascorbate-glutathione (AsA–GsH) cycle may be activated to scavenge AOS and the synthesis of reduced glutathione (GSH) may be stimulated for subsequent synthesis of phytochelatins (PCs) to chelate Cd2+ directly.
期刊：
JOURNAL OF HORTICULTURAL SCIENCE & BIOTECHNOLOGY,2009年84(4):415-420 ISSN：1462-0316
通讯作者：
Jin, Xiao-Ling
作者机构：
[Jin, Xiao-Ling] Cent S Univ Forestry & Technol, Environm & Art Design Sch, Changsha 410004, Hunan, Peoples R China.;[Zhang, Dong-Lin; Zhang, Ri-Qing] Cent S Univ Forestry & Technol, Coll Resource & Environm, Changsha 410004, Hunan, Peoples R China.;[He, Ping] China Int Engn Consulting Corp, Dept Agr Forestry & Water, Beijing 100044, Peoples R China.;[Cao, Fu-Xiang] Cent S Univ Forestry & Technol, Coll Life Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Jin, Xiao-Ling] C;Cent S Univ Forestry & Technol, Environm & Art Design Sch, Changsha 410004, Hunan, Peoples R China.
摘要：
Zelkova schneideriana Hand.-Mazz. is a high-value plant used for hardwood tumber production in China. Because of over-harvesting and limited numbers of seedlings for plantations, Z. schneideriana has become an endangered species in China. To grow this plant sustainably, we generated a protocol to reproduce this species using tissue culture. Leaf explants were cultured on Wood Plant Medium (WPM), Murashige and Skoog (MS), 1/2MS (main elements), or B5 media variously supplemented with 6-benzylaminopurine (BA), naphthaleneacetic acid (NAA), indole-3-butyric acid (IBA), or 2, 4-dichlorophenoxyacetic acid (2,4-D) to induce callus, adventitious shoots, and rooting. WPM was the most effective medium for callus induction and resulted in two types of calli from leaf explants. One was soft and straw-yellow coloured on WPM containing 0.45, 4.54, 9.08, or 13.62 NM 2,4-D or on WPM supplemented with 4.44 mu M BA in combination with 0.45 or 4.54 NM 2,4-D. The other callus type was friable and green on WPM supplemented with 0.44, 4.44, 8.88, or 13.32 mu M BA or on WPM supplemented with 4.44 mu M BA in combination with 0.54 or 5.37 mu M NAA. Only the latter callus type was observed to regenerate plantlets. WPM supplemented with 4.44 mu M BA plus 2.68 mu M NAA had a 64.5% shooting rate, with 6.75 shoots per callus. Rooting at 70.0%, with an average of 3.6 roots per shoot, was obtained on WPM supplemented with 2.46 mu M IBA in combination with 2.0 g l(-1) activated charcoal (AC). In total, 86% of regenerated Z. schneideriana plantlets survived after acclimation to a greenhouse at 24 degrees +/- 2 degrees C under a 16 h photoperiod provided by cool-white fluorescent lights (PPFD = 65.5 mu mol m(-2) s(-1)), and 100% survived after transplanting to an experimental field plot.
作者机构：
[Gu, Z. Y.; Wang, S.; Xie, B. X.; Zhong, Q. P.] Cent South Univ Forestry & Technol, Coll Resources & Environm, Changsha 410004, Hunan, Peoples R China.;[Zeng, J. Q.; Zeng, J. X.] Xinfeng Fruit Ind Ltd Co, Qidong 414400, Hunan, Peoples R China.
通讯机构：
[Wang, S.] C;Cent South Univ Forestry & Technol, Coll Resources & Environm, Changsha 410004, Hunan, Peoples R China.
关键词：
Bud mutation;Chinese jujube;Cultivar
摘要：
'Zhongqiusucui' jujube is a bud mutation from 'Tang' jujube. The fruit of 'Zhongqiusucui' jujube is middle size and cylindrical form with thin pericarp, thick pulp and small core. The averaged weight of a fruit is 13.8 g, and the edible percentage is up to 97.1%. The pulp is white, smooth, crispy and juicy with 31.76% soluble solids and 29.41% total sugar. The favor is strong sweet and slight fragrant. It matures later about 8 d than 'Tang' jujube. Its average fruit weight is 2.2 times as that of 'Tang' jujube and the total sugar content is 4.44% which is higher than that of the latter. It has a nice favor, excellent quality and good appearance. Quality comparison experiments and local trials proved that it is adaptable to the local growing conditions having high and stable production, which should be extended in the south of China.
作者机构：
[Gu, Z. Y.; Wang, S.; Zhuang, H. W.; Xie, B. X.] Cent South Univ Forestry & Technol, Coll Resources & Environm, Changsha, Hunan, Peoples R China.;[Zeng, J. Q.; Zeng, J. X.] Xinfeng Fruit Ind Ltd Co, Qidong, Peoples R China.
通讯机构：
[Xie, B. X.] C;Cent South Univ Forestry & Technol, Coll Resources & Environm, Changsha, Hunan, Peoples R China.
摘要：
The effect of 1-methylcyclopropene on texture properties of fresh fruit in storage shelf period was investigated using Zizyphus jujuba 'Zhongqiusucui' as materials by TA-XT2i. Results showed that the effects of 1-MCP of 0.4 μl/L on the texture properties of fresh fruit reached an extremely significant level and the effect it on hardness, frangibility, resilience and adhesiveness reached an extremely significant level.
摘要：
While seedlings of Radish raised in increasing contents of Cd(2+) in hydroponic system, increment in ratio of superoxide dismutase (SOD) / catalase (CAT) and levels of superoxide anion (O(2)(center dot-)) and lipid peroxides was observed; 125 mu mol.L(-1) Cd(2+) treatment resulted in a gradual elevation in SOD activity; while at Cd(2+) level of 250 and 500 mu mol-L(-1) SOD activity considerably increased at first, then declined to even lower than that of the control. CAT activity showed enhancement in leaves whereas decrease in roots. Cd(2+) induced an obvious elevation in GR activity in both roots and leaves. A marked elevation in GR activity suggests that ascorbate-glutathione (AsA-GsH) cycle may be activated to scavenge AOS and the synthesis of reduced glutathione (GSH) may be stimulated for subsequent synthesis of phytochelatins (PCs) to chelate Cd(2+) directly.
摘要：
Hexavalent chromium [Cr(VI)] is toxic and readily adsorbed by some adsorbents; therefore, its removal from wastewater is extremely important. Batch adsorption of Cr(VI) from aqueous solution using raw and acid-modified activated carbon was investigated in this study. The Cr(VI) sorption was found to be dependent on pH, contact time, initial concentration of solution, adsorbent dose, and temperature. The maximum efficiencies of Cr(VI) removal were 97.67 and 99.87% for activated carbon (AC0) and modified activated carbon (AC1), respectively. The maximum adsorption capacity was found to be 4.75 and 5.95 mg/g for AC0 and AC1, respectively. Thermodynamic parameters indicate that the adsorption process was endothermic and spontaneous in nature. Freundlich adsorption isotherm model was fitted well the equilibrium data for both adsorbents. The Cr(VI) uptake by AC0 and AC1 followed pseudo first-order and second-order kinetics, but was best described by the pseudo second-order rate model. The results also showed that both film diffusion and intraparticle diffusion were concurrently operating, but that intraparticle diffusion controlled the adsorption mechanism.
作者机构：
[王森; 谢碧霞; 钟秋平; 杜红岩] School of Resources and Environment,Central South University of Forestry and Technology;[王森; 谢碧霞; 钟秋平; 杜红岩] Economic Forest Research and Development Center,CAF
会议名称：
The 9th National Conference on Rheology
会议时间：
2008-09
会议地点：
中国湖南长沙
摘要：
<正>The rheological properties in the supematant of peach gum from Prunnus dulcis were discussed in order to provide more scientific technical parameters and references for developing peach gum as a ki
作者机构：
Research Center of Forestry Remote Sensing and Information Engineering, Central South University of;College of Resource and Environment, Central South University of Forestry and Technology, 498 Shaosh;College of Resources Science and Technology, Beijing Normal University, Xinjiekou Outer St.19th, Hai
摘要：
Support vector machines (SVMs) is a statistical learning method with good performance when the sample size is small, due to their excellent performance, SVMs are now used extensively in pattern classification applications and regression estimation, Unfortunately, it is currently considerably slower in test phase caused by number of the support vectors, which has been a serious limitation for some application such as remotely sensed data classification. To overcome this problem, we introduced mean shift (MS) algorithm to select the feature vectors. Through the MS algorithm, the modes of data are real input vectors and the number ofmodes is controlled by three physical meaning parameters (hs, hr, M). Remotely sensed data has spatial and spectral charactersand it has several million pixels in one image generally. Therefore, how to reduce the complexity of the data becomes a crucial problem in remotely sensed data classification based on SVM method. In order to solve such problem, we proposed MS-SVMs classification method. MS-SVMs is the combined process of segmenting an image into regions of pixels based on mean shift algorithm, computing attributes for each region to create objects, and classifying the objects based on attributes, to extract features with SVMs supervised classification. This workflow is designed to be helpful and intuitive, while allowing you to customize it to specific applications. In order to verify the feasibility and effectiveness of proposed method, Landsat ETM image is adopted as original data, and experiments proved the proposed method is robust and efficient, further more, it helps improve classification speed and accuracy observably.
通讯机构：
Institute of Environment Science and Engineering, College of Resources and Environment, Central South University of Forestry and Technology, China
