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1Sr-Nd isotope geochemistry of eolian dust of the arid-semiarid areas in China: Implications for loess provenance and monsoon evolution显示文摘Minerals and rocks have distinct 87Sr/86Sr and 143Nd/144Nd ratios, depending on their geological origin and ages, and these isotope ratios are less altered than elemental composition during transport in the atmosphere or after deposition as sediments, thus stable isotopes of Sr and Nd have great potential as tracers for provenance and trans- port of materials. During the hypergene process, Sr isotope ratios of sediments are controlled by their parent rocks, particle sizes and chemical weathering. In general, the higher the Sr isotope ratios of parent rocks, and/or the more the fine-grained fractions, and/or the stronger the chemical weathering, thus the higher the Sr isotope ratios of sediments. On the contrary, there are lower Sr isotope ratios of sedi- ments. Nd isotope ratios of sediments, independent of their particle sizes and chemical weathering, are only associated with parent rocks. For the prove- nance of the Chinese Loess Plateau, different re- seachers drew discordant and even contradictory conclusions by using the method of Sr-Nd isotopic tracing. From the previous Nd isotope data, it is con- sidered that the Tarim Basin, deserts in the central and west parts of Inner Mongolia and the Tibetan Plateau are the main sources of the Chinese Loess Plateau, and are also manufacturers for eolian dust of the Far East regions, together with the Chinese Loess Plateau. Sr isotope ratios of eolian dust are solely affected by wind sorting and weather- ing-pedogenesis due to its homogeneous composi- tion in the Chinese Loess Plateau. Wind sorting isrelated to the East Asian winter monsoon but weath- ering-pedogenesis is mainly associated with the East Asian summer monsoon. Studies on Sr isotopic compositions of the loess-paleosol sequence suggest that 87Sr/86Sr ratios in acid-soluble materials are an index for chemical weathering intensity of the Chi- nese Loess Plateau, indicating the East Asian sum- mer monsoon variations, whereas 87Sr/86Sr ratios in acid-insoluble materials are significantly controlled by particle sizes, and can be used as a proxy indicator reflecting the East Asian winter monsoon variations. Variations of 87Sr/86Sr ratios in acid-insoluble materi- als in the past 2.6Ma further demonstrate that the East Asian winter monsoon gradually strengthened since the beginning of the Quaternary period. This result agrees with the prior conclusion that climate gradually cooled since the onset of the Quaternary Ice Age.RAO Wenbo YANG Jiedong CHEN Jun LI Gaojun 2006Chinese Science Bulletin2006,51,12:21
2Aggregated spatial distributions of species in a subtropical karst forest,southwestern China显示文摘Aims spatial distribution patterns of species reflect not only the ecological processes but also the habitat features that are related to species distribution.in karst topography,species distribution patterns provide more specific information about their environments.The objectives of this study are as follows:(i)to analyse and explain the spatial distribution patterns of conspecific trees in an old-growth subtropical karst forest;(ii)to investigate pattern changes at different spatial scales;(iii)to test the spatial pattern similarity(or dissimilarity)between trees at different abundances,diameter at breast height classes,canopy layers and different functional groups(shade tolerance and seed dispersal mode);(iv)to examine whether habitat heterogeneity has an important effect on the species spatial distribution.Methods The spatial distributions of woody species with≥20 individuals in a 1-ha subtropical karst forest plot at maolan in southwestern China were quantified using the relative neighbourhood densityΩbased on the average density of conspecific species in a circular neigh-bourhood around each species.Important Findingsaggregated distribution is the dominant pattern in the karst forest,but the ratio of aggregated species in total species number decreases with an increase in spatial scale.less abundant species are more aggregated than most abundant species.aggregation is weaker in larger diameter classes,which is consistent with the prediction of self-thinning.seed dispersal mode influences spatial patterns,with species dispersed by animals being less aggregated than those dispersed by wind and gravity.other species functional traits(e.g.shade tolerance)also influence the species spatial distributions.moreover,differences among species habitat associations,e.g.with rocky outcrops,play a significant role in species spatial distributions.These results indicate that habitat heterogeneity,seed dispersal limitation and self-thinning primarily contribute to the species spatial distributions in this subtropical karst forest.Zhonghua Zhang Gang Hu Jiedong Zhu Jian Ni 2013Journal of Plant Ecology2013,6,2:17
3Progress in the mechanism and targeted drug therapy for COPD显示文摘Chronic obstructive pulmonary disease(COPD)is emphysema and/or chronic bronchitis characterised by long-term breathing problems and poor airflow.The prevalence of COPD has increased over the last decade and the drugs most commonly used to treat it,such as glucocorticoids and bronchodilators,have significant therapeutic effects;however,they also cause side effects,including infection and immunosuppression.Here we reviewed the pathogenesis and progression of COPD and elaborated on the effects and mechanisms of newly developed molecular targeted COPD therapeutic drugs.Among these new drugs,we focussed on thioredoxin(Trx).Trx effectively prevents the progression of COPD by regulating redox status and protease/anti-protease balance,blocking the NF-κB and MAPK signalling pathways,suppressing the activation and migration of inflammatory cells and the production of cytokines,inhibiting the synthesis and the activation of adhesion factors and growth factors,and controlling the cAMP-PKA and PI3K/Akt signalling pathways.The mechanism by which Trx affects COPD is different from glucocorticoid-based mechanisms which regulate the inflammatory reaction in association with suppressing immune responses.In addition,Trx also improves the insensitivity of COPD to steroids by inhibiting the production and internalisation of macrophage migration inhibitory factor(MIF).Taken together,these findings suggest that Trx may be the ideal drug for treating COPD.Cuixue Wang Jiedong Zhou Jinquan Wang Shujing Li Atsushi Fukunaga Junji Yodoi Hai Tian 2020Signal Transduction and Targeted Therapy2020,5,1:8
4Sr, Nd and O Isotopic Studies on the Genesis of the Huashan Granite Complex显示文摘Systematical Sr, Nd and O isotopic studies were made on the Huashan granite complex in Guangxi. Incombination with the studies of geological, petrological and geochemical data, it is believed that the complexconsists of granites of three stages. with different geneses and different source materials. They are not the prod-ucts of differentiation and evolution of one single consanguineous magma. Granites of the 1st stage are of theIndosinian syntectic type or I type, also derived from a mixed mantle-crustal source. Those of the 2nd stage areof the early Yanshanian syntectic type or I type. also derived from a mixed mantle-crustal source, and those ofthe 3rd stage are of the late Yanshanian transformed type or S type. derived from a crustal source.Zhu Jinchu Li Xiangdong Shen Weizhou Wang Yinxi Yang Jiedong Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu Department of Materials Analysis, Nanjing University, Nanjing, Jiangsu Jia Zhongpeng 1990Acta Geologica Sinica(English Edition)1990,64,1:5
5Influence of Nano-Al Concentrates on the Corrosion Resistance of Epoxy Coatings显示文摘A two-stage process was used to produce nano-composite epoxy coatings.The first step involved preparing nano-AI concentrates with high concentration and low viscosity,and the second step produced nanocomposite epoxy coatings by mixing the nano-AI concentrates and epoxy resin.Later,the coating was examined with immersion and salt spray tests.The coatings were characterized by electrochemical impedance spectroscopy(EIS),scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS).The results showed that the 5%nano-AI significantly improves the corrosion resistance of the coatings.There are two effects of nano-AI on the coating.Nano-AI is corroded initially to protect the substrate from corrosion, and then the aluminum oxide and aluminum hydroxide were produced after corrosion of nano-AI,which hindered the transmission of corrosion fluid into the coatings.Yongchun Liang Fu-Chun Liu Ming Nie Shuyan Zhao Jiedong Lin En-Hou Han 2013Journal of Materials Science & Technology2013,29,4:4
6Practical strategy to construct anti-osteosarcoma bone substitutes by loading cisplatin into 3D-printed titanium alloy implants using a thermosensitive hydrogel显示文摘Surgical resection and perioperative adjuvant chemotherapy-based therapies have improved the prognosis of patients with osteosarcoma;however,intraoperative bone defects,local tumour recurrence,and chemotherapy-induced adverse effects still affect the quality of life of patients.Emerging 3D-printed titanium alloy(Ti6Al4V)implants have advantages over traditional implants in bone repair,including lower elastic modulus,lower stiffness,better bone conduction,more bone in-growth,stronger mechanical interlocking,and lager drug-loading capacity by their inherent porous structure.Here,cisplatin,a clinical first-line anti-osteosarcoma drug,was loaded into Ti6Al4V implants,within a PLGA-PEG-PLGA thermo-sensitive hydrogel,to construct bone substitutes with both anti-osteosarcoma and bone-repair functions.The optimal concentrations of cisplatin(0.8 and 1.6 mg/mL)were first determined in vitro.Thereafter,the anti-tumour effect and biosafety of the cisplatin/hydrogel-loaded implants,as well as their bone-repair potential were evaluated in vivo in tumour-bearing mouse,and bone defect rabbit models,respectively.The loading of cisplatin reduced tumour volume by more than two-thirds(from 641.1 to 201.4 mm3)with negligible organ damage,achieving better anti-tumour effects while avoiding the adverse effects of systemic cisplatin delivery.Although bone repair was hindered by cisplatin loading at 4 weeks,no difference was observed at 8 weeks in the context of implants with versus without cisplatin,indicating acceptable long-term stability of all implants(with 8.48%-10.04%bone in-growth and 16.94%-20.53%osseointegration).Overall,cisplatin/hydrogel-loaded 3D-printed Ti6Al4V implants are safe and effective for treating osteosarcoma-caused bone defects,and should be considered for clinical use.Zehao Jing Renhua Ni Jiedong Wang Xinhong Lin Daoyang Fan Qingguang Wei Teng Zhang Yufeng Zheng Hong Cai Zhongjun Liu 2021Bioactive Materials2021,6,12:3
7Analysis of Nitrosamines Migration from Condoms in the Chinese Market Using a Proper Migration Experiment显示文摘Di Feng Qingfeng Zhou Xuelian Cheng Jiedong Wang Quanli Yang 2010Bulletin of Environmental Contamination and Toxicology2010,,4:1
8Tracking control of uncertain dynamic non-holonomic system and its application to wheeled AGVs显示文摘Wei Jiedong Wei Huo Tso S K 2000IEEE Transactions on Robotics and Automation2000,16,6:1
9Detection and toxicity assessment of nitrosamines migration from latex gloves in the Chinese market显示文摘Di Feng Huiping Wang Xuelian Cheng Jiedong Wang Lifeng Ning Qingfeng Zhou Yue Zhou Quanli Yang 2009International Journal of Hygiene and Environmental Health2009,,5:1
10Effects of droplet size and spray interval on root-to-shoot ratio,photosynthesis efficiency,and nutritional quality of aeroponically grown butter head lettuce显示文摘The proper selection of the atomizer(droplet size)and nutrient solution spray interval is one of the most important factors to be investigated in aeroponics system for sustainable agriculture.The aim of this study was to research the effects of four aeroponics atomizing nozzles(one air-assisted;A_(1),two air-less;A_(2) and A_(3),and one ultrasonic fogger;A_(4))with droplet sizes of 11.24μm,26.35μm,17.38μm,and 4.89μm,respectively,four spray intervals(15 min(I_(1)),30 min(I_(2)),45 min(I_(3))and 60 min(I_(4)))at a 5 min of constant spray time by atomizing the Hoagland’s nutrient solution on growth,root-to-shoot ratio,photosynthesis characteristics,pigments,and nutritional quality of the aeroponically grown lettuce.The experimental results demonstrated that in A_(1) atomizer and I_(2) interval,the growth,photosynthesis efficiency,chlorophyll,carotenoids,and nutritional values of the lettuce were significantly higher compared to that grown in A_(2) and A_(3) atomizers at all spray intervals.The shoot developments were more constrained than root,prominent to the alteration of root-to-shoot ratio(fresh and dry)in the influence of different droplet sizes and spray intervals.Moreover,the plants did not grow well in A_(4) atomizer associated with proposed spray intervals.The results disclosed that there was an obvious interaction between droplet sizes(atomizers)and spray intervals for growth,the ratio of root to shoot,photosynthesis efficiency,pigments,and nutritional quality of the aeroponically grown lettuce.This research study increases the awareness of the proper droplet size(atomizer)and the regulation of nutrient solution spray interval for leafy vegetables grown in an aeroponics system.Mazhar Hussain Tunio Jianmin Gao Waqar Ahmed Qureshi Sher Ali Sheikh Jiedong Chen Farman Ali Chandio Imran Ali Lakhiar Kashif Ali Solangi 2022International Journal of Agricultural and Biological Engineering2022,15,1:1
11Silicate weathering and C02 consumption deduced from the seven Chinese rivers originating in the Oinghai-Tibet Plateau显示文摘Wu Weihna Xu Shijin Yang Jiedong 2008Chemical Geology2008,249,:1
12Variations in Sr and C isotopes and Ce anomalies in successions from China:Evidence for the oxygenation of Neoproterozoic seawater?显示文摘Yang Jiedong Sun Weiguo Wang Zongzhe 199993(2/3):215-2331999,93,23:1
13Mineralogy, major and trace element geochemistry of riverbed sedi- ments in the headwaters of the Yangtze, Tongtian River and Jinsha River显示文摘Wu Weihua Xu Shijun Lu Huayu Yang Jiedong Yin Hongwei Liu Wen 2011Journal of Asian Earth Sciences2011,40,:1
14Silicate weathering and CO2 consumption deduced from the seven Chinese rivers originating in the Qinghai-Tibet Plateau显示文摘Weihua Wu Shijin Xu Jiedong Yang 2008Chem Geol2008,159,14:1
15Nd and Sr isotopic characteristics of Chinese deserts: Implications for the provenances of Asian dust显示文摘Jun Chen Gaojun Li Jiedong Yang Wenbo Rao Huayu Lu William Balsam Youbin Sun Junfeng Ji 2007Geochimica et Cosmochimica Acta2007,,15:1
16Study on the Nd-Sr isotope of the Xihuashan granite显示文摘Shen Weizhou Xu Shijin Wang Yinxi Yang Jiedong 1994Chinese Sci Bull1994,39,8:1
17Variations in 87Sr/86Sr ratios of calcites in Chinese loess:a proxy for chemical weathering associated with the East Asian summer monsoon 显示文摘 Chen Jun An Zhisheng 2000Palaeogeography Palaeoclimatology Palaeoecology2000,157,:1
18Variations in Sr and C isotopes and Ce anomalies in successions from China: Evidence for the oxygenation of Neoproterozoic seawater? 显示文摘Yang Jiedong Sun Weiguo Wang Zongzhe Xue Yaosong Tao Xiancong 1999Precamb Res1999,93,23:1
19Preparation and structure and mechanical properties of poly(styrene-b-butadiene)/clay nanoeomposites 显示文摘Mingyi Liao Jiedong Zhu Hongde Xu 2004J Appl Polym Sci2004,92,5:1
20Vanations in Sr and C isotopes and Ce anomalies in successions from China: Evidence for the oxygenation of Neoproterozoic seawater显示文摘Yang Jiedong Sun Weiguo Wang Zongzhe 1999Precambrian Rcseaeh1999,93,:1
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