检索结果-南通市图书馆

Selective depression mechanism of ferric chromium lignin sulfonate for chalcopyrite–galena flotation separation

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2018年第5期25卷 489-497页

作者： Jin-sheng Yu run-qing liu Li Wang Wei Sun Hong Peng Yue-hua Hu School of Minerals Processing and Bioengineering Central South University School of Chemical Engineering The University of Queensland

Selective recovery of chalcopyrite–galena ore by flotation remains a challenging *** development of highly efficient,low-cost,and environmentally friendly depressants for this flotation is necessary because most of available reagents(e.g.,K_2Cr_2O_4)are expensive and adversely affect the *** this study,ferric chromium lignin sulfonate(FCLS),which is a waste-product from the paper and pulp industry,was introduced as a selective depressant for galena with butyl xanthate(BX)as a *** show that the residue recovery of Pb in Cu concentrate was substantially reduced to 4.73%using FCLS compared with 10.71%using the common depressant K_2Cr_2O_*** underlying mechanisms were revealed using zeta-potential measurements and X-ray photoelectron spectroscopy(XPS).Zeta-potential measurements revealed that FCLS was more efficiently absorbed onto galena than onto *** measurements further suggested that FCLS enhanced the surface oxidation of galena but prevented that of ***,FCLS could be a potential candidate as a depressant for chalcopyrite–galena flotation because of its low cost and its lack of detrimental effects on the environment.

关键词： chalcopyrite galena depressant flotation separation

Effects of Arbuscular Mycorrhizal Fungi Communities on Soil Quality and the Growth of Cucumber Seedlings in a Greenhouse Soil of Continuously Planting Cucumber

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2012年第1期22卷 79-87页

作者： LI Yan CHEN Ying-Long LI Min LIN Xian-Gui liu run-Jin Institute of Mycorrhizal Biotechnology Qingdao Agricultural UniversityQingdao 266109(China) State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing210008(China) School of Earth and Environment The University of Western AustraliaPerth 6009(Australia)

A pot experiment was performed to determine the effects of arbuscular mycorrhizM fungi （AMF） communities on soil properties and the growth of cucumber seedlings in a degraded soil that had been used for continuous cucumber monoculture in a greenhouse for 15 years. In the experiment, AMF communities （created by combining various AMF species that were found to be dominant in natural farm soil） were inoculated into the degraded soil, and then the soil was planted with cucumber. Inoculation with AMF communities did not affect soil pH but increased soil aggregate stability and decreased the concentrations of salt ions and electrical conductivity （EC） in the soil. Inoculation with AMF communities increased the numbers of culturable bacteria and actinomycetes but reduced the number of fungi. AMF communities increased plant growth, soluble sugar content, chlorophyll content, and root activity compared to non-mycorrhizal or a single AMF species treatments. Improvements of soil quality and plant growth were greatest with the following two communities： Glomus etunicatum ＋ G. mosseae ＋ Gigaspora margarita ＋ Acaulospora lacunosa and G. aggregatum ＋ G. etunicatum ＋ G. mosseae ＋ G. versiforme ＋ G. margarita ＋ A. lacunosa. The results suggested that certain AMF communities could substantially improve the quality of degraded soil.

关键词： enzyme activities microbial community protected cultivation rhizosphere soluble sugar

A Steroidal Glycoside from Cynanchum versicolor Bunge

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第7期17卷 919-921页

作者： Zhao Guang ZHENG run Hui liu Ling Yi KONG Wei Dong ZHANG Department of Phytochemistry Second Military Medical University Shanghai 200433 Departmentof Natural Medicinal Chemistry China Pharmaceutical University Nanjing 210038 School of Pharmacy Shanghai Jiaotong University Shanghai 200030

A new C21 steroidal glycoside, named cynanversicoside F （1）, was isolated from the root of Cynanchum versicolor Bunge. Its structure was established as glaucogenin-A 3-O-β-D- digitoxopyranosyl-（1→4）-β-D-cymarop... 详细信息

关键词： Cynanchum versicolor C21 steroidal glycoside cynanversicoside F.

Pb(Ⅱ)和Cd(Ⅱ)在人造沸石上竞争吸附位点的研究

在线全文

学校读者我要写书评

暂无评论

太原科技大学学报 2024年第2期45卷 182-186,192页

作者：刘富平刘宏芳刘润龙李江东李欣王瑞忻州市生态环境局东部区域监测技术保障中心代县分中心山西忻州034200 太原科技大学环境科学与工程学院太原030024

Pb(Ⅱ)和Cd(Ⅱ)是水中常见的重金属离子,其超标排放对人体健康和水体环境有较大危害,因此,水中Pb(Ⅱ)和Cd(Ⅱ)的去除尤为重要。首先采用机械球磨法制备人造沸石材料,然后研究了Pb(Ⅱ)和Cd(Ⅱ)在该材料上的吸附特性。研究结果表明:人造... 详细信息

Pb(Ⅱ)和Cd(Ⅱ)是水中常见的重金属离子,其超标排放对人体健康和水体环境有较大危害,因此,水中Pb(Ⅱ)和Cd(Ⅱ)的去除尤为重要。首先采用机械球磨法制备人造沸石材料,然后研究了Pb(Ⅱ)和Cd(Ⅱ)在该材料上的吸附特性。研究结果表明:人造沸石去除Pb(Ⅱ)和Cd(Ⅱ)的过程符合Langmuir模型,单一吸附时:Pb(Ⅱ)和Cd(Ⅱ)的吸附量分别为503.97和460.23 mg/g,竞争体系下,Pb(Ⅱ)和Cd(Ⅱ)的初始浓度比为1∶1、2∶1和1∶2时,Pb(Ⅱ)和Cd(Ⅱ)的吸附量分别为468.41、474.71、419.01 mg/g和437.13、365.39、420.31 mg/g.竞争体系下:Pb(Ⅱ)的选择系数为0.3668-83.3897,远大于Cd(Ⅱ)的选择系数,Pb(Ⅱ)为二元吸附体系的优势离子。由点位能量分布可知,Pb(Ⅱ)和Cd(Ⅱ)的初始浓度和吸附量与位点能量成负相关。单一体系时:Pb(Ⅱ)和Cd(Ⅱ)的E_(m)分别为45.50和47.58 kJ/mol竞争体系下,不同浓度比时:Pb(Ⅱ)和Cd(Ⅱ)的平均位点能量E_(m)和位点分布的均匀性不同,与具体的吸附体系相关。

关键词：人造沸石吸附模型位点能量分布竞争吸附

Effects of Soil Depth and Season Variation on Community Structure of Arbuscular Mycorrhizal Fungi in Greenhouse Soils Planted with Watermelon

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2013年第3期23卷 350-358页

作者： liu run-Jin LI Yan DIAO Zhi-Kai LI Min LIN Xian-Gui Institute of Mycorrhizal Biotechnology Qingdao Agricultural University State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences

The characteristics of arbuscular mycorrhizal fungal (AMF) community structure in various soil depths and growing seasons of watermelon (Citrullus vulgaris) grown in commercial greenhouses in Daxing of Beijing and Weifang and Laiyang of Shandong, China were investigated using both morphological identification and denaturing gradient gel electrophoresis. The sampled soils had been used for continuous greenhouse production of watermelon for 0, 5, 10, 15, or 20 years. Glomus claroideum was the dominant species in the greenhouse soils planted for 5, 10, and 15 years in Laiyang, while Glomus mosseae and Glomus etunicatum were dominant in the nearby open farmland soil. Sorenson's similarity index of AMF community composition ranged from 0.67 to 0.84 in the soils planted for 5 years, and from 0.29 to 0.33 for 20 years among the three locations. Spore abundance, species richness, and the Shannon index were highest near the soil surface (0-10 cm) and decreased with soil depth, and higher in June and October than in August and December. Canonical correspondence analysis showed that available P and the number of years that soil had been used for greenhouse production were the main factors contributing to the variance of AMF community composition. It was concluded that the community structure of AMF was mainly influenced by soil available P and planting time of watermelon as well as by soil depth and seasonal variation in the commercial greenhouse.

关键词： canonical correspondence analysis Shannon index Sorenson's similarity index species richness spore abundance

ZiyuglycosideⅡinhibits the growth of digestive system cancer cells through multiple mechanisms

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2021年第5期19卷 351-363页

作者： ZHONG Ying LI Xiao-Yu ZHOU Fei CAI Ya-Jie SUN Rong liu run-Ping The Second Hospital Cheeloo College of MedicineShandong UniversityJinan 250033China School of Chinese Materia Medica Beijing University of Chinese MedicineBeijing 100029China

Digestive system cancers,including liver,gastric,colon,esophageal and pancreatic cancers,are the leading cause of cancers with high morbidity and mortality,and the question of their clinical treatment is still *** studies have indicated that ZiyuglycosideⅡ(ZYGⅡ),the major bioactive ingredient extract from Sanguisorba officinalis L.,significantly inhibits the growth of various cancer ***,the selective anti-tumor effects of ZYGⅡagainst digestive system cancers are not systemically *** this study,we reported the anti-cancer effect of ZYGⅡon esophageal cancer cells(OE21),cholangiocarcinoma cells(Hu CCT1),gastric cancer cells(BGC-823),liver cancer cells(Hep G2),human colonic cancer cells(HCT116),and pancreatic cancer cells(PANC-1).We also found that ZYGⅡinduced cell cycle arrest,oxidative stress and mitochondrial *** pharmacology analysis suggested that UBC,EGFR and IKBKG are predicted targets of ZYGⅡ.EGFR signaling was suggested as the critical pathway underlying the anti-cancer effects of ZYGⅡand both docking simulation and western blot analysis demonstrated that ZYGⅡwas a potential EGFR ***,our results showed synergistic inhibitory effects of ZYGⅡand chemotherapy 5-FU on the growth of cancer *** summary,ZYGⅡare effective anti-tumor agents against digestive *** systemic evaluation of the anti-cancer activities in vitro and in vivo and characterization of underlying mechanism will promote the development of novel supplementary therapeutic strategies based on ZYGⅡfor the treatment of digestive system cancers.

关键词： ZiyuglycosideⅡ Digestive system cancers Network pharmacology EGFR pathway

Trends of Extreme Precipitation in Eastern China and Their Possible Causes

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2015年第8期32卷 1027-1037页

作者： liu run liu Shaw Chen Ralph J.CICERONE SHIU Chein-Jung LI Jun WANG Jingli ZHANG Yuanhang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Research Center for Environmental Changes Academia Sinica Department of Atmospheric Science NCU National Academy of Sciences Earth System Science University of California Institute of Urban Meteorology of China Meteorological Administration

Significant increases of heavy precipitation and decreases of light precipitation have been reported over widespread regions of the globe. Global warming and effects of anthropogenic aerosols have both been proposed as possible causes of these changes. We examine data from urban and rural meteorological stations in eastern China （1955-2011） and compare them with Global Precipitation Climatology Project （GPCP） data （1979-2007） and reanalysis data in various latitude zones to study changes in precipitation extremes. Significant decreases in light precipitation and increases in heavy precipitation are found at both rural and urban stations, as well as low latitudes over the ocean, while total precipitation shows little change. Characteristics of these changes and changes in the equatorial zone and other latitudes suggest that global warming rather than aerosol effects is the primary cause of the changes. In eastern China, increases of annual total dry days （28 days） and ） 10 consecutive dry days （36%） are due to the decrease in light precipitation days, thereby establishing a causal link among global warming, changes in precipitation extremes, and higher meteorological risk of floods and droughts. Further, results derived from the GPCP data and reanalysis data suggest that the causal link exists over widespread regions of the globe.

关键词： extreme precipitation global warming aerosols meteorological risk of floods and droughts

Comparison of pharmacokinetics,efficacy and toxicity profile of gemcitabine using two different administration regimens in Chinese patients with non-small-cell lung cancer

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第5期8卷 307-313页

作者： WANG Lin-run liu Jian HUANG Ming-zhu XU Nong Department of Clinical Pharmacy the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China

Objective： To conduct a randomized comparative trial of pharmacokinetics, efficacy and toxicity profile treatment with 1200 mg/m^2 gemcitabine using standard 30-min infusion or fixed dose rate （FDR） infusion [10 mg/（m^2-min）] on days 1 and 8 plus carboplatin AUC （area under curve） 5 on day 1 in Chinese non-small-cell cancer patients. Twelve patients were enrolled in this study. Methods： Plasma gemcitabine concentrations were measured by ion-pair reversed phase high performance liquid chromatography. Antitumoral activity and toxicity of gemcitabine was assessed according to World Health Organization criteria. Results： The obtained mean parameters, such as T1/2 （elimination half time）, AUC, and CL （clearance）, were consistent with those reported in literature. Qualified response rate in our study was 33.3% for standard arm and 50% for FDR ann. Additional 50% and 33.3% patients contracted stable disease （SD） in standard arm and FDR arm, respectively. The predominant toxicity was hematologic, and patients in the standard infusion ann experienced consistently more hematologic toxicity, Conclusion： Pharmacokinetic and clinical data in this trial support the continued evaluation of the FDR infusion strategy with gemcitabine.

关键词： Gemcitabine Non-small-cell lung cancer Pharmacokinetics Qualified response Safety

Modified frontolateral partial laryngectomy operation: combined muscle-pedicle hyoid bone and thyrohyoid membrane flap in laryngeal reconstruction

在线全文

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2013年第2期10卷 103-109页

作者： Dian Ouyang Tian-run liu Yan-Feng Chen Jian Wang Key Laboratory of Oncology in Southern China Department of Head and Neck Sun Yat-sen University Cancer Center Department of Otorinolaryngology Head and Neck Surgery The Sixth Affiliated Hospital of Sun Yat-sen University Department of Anesthesia Sun Yat-Sen University Cancer Center

Objective: Laryngeal reconstruction is needed to preserve laryngeal function in patients who have undergone extensive vertical or frontal partial laryngectomy. However, the procedure remains a difficult challenge. Several reconstruction techniques have been described, but these techniques pose risks of complications such as laryngeal stenosis. This study aimed to evaluate the postoperative course and functional outcomes of a new technique that combined a muscle-pedicle hyoid bone and a thyrohyoid flap during laryngeal reconstruction after tumor resection. Methods: Four patients underwent extensive vertical partial or frontal partial laryngectomy for cancer. After tumor resection, laryngeal reconstruction was performed using the proposed technique. Postoperative recovery time, complications, and oncologic results were evaluated. Results: The four patients were successfully treated with the proposed technique. No dyspnea, dysphagia, or death occurred during the postoperative course. Decannulation was performed after a median of 3 days. The average postoperative hospital stay was 7 days. Short-term postoperative functional recovery was normal. No laryngeal stenosis or tumor recurrence was observed in any of the four patients after a follow-up period of more than 24 months. Conclusion: The combination of the muscle-pedicle hyoid bone and the thyrohyoid flap is a reliable procedure for laryngeal reconstruction after extensive vertical partial or frontal partial laryngectomy.

关键词： Hyoid bone reconstruction laryngeal cancer flap operation