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| 1 | Natural^(15)N abundance in soils and plants in relation to N cycling in a rangeland in Inner Mongolia显示文摘Aims Natural 15N abundance provides integrated information about nitrogen(N)input,transformation and output,indirectly reflecting N cycling traits within terrestrial ecosystems.However,relationships between natural 15N abundance and N cycling processes are poorly understood in China.Here,our primary objectives were to(i)examine the effects of grazing at varying levels of intensity on d15N of soils and plants in a semi-arid grassland;(ii)detect the relationships between d15N of soils and four major N cycling processes(i.e.mineralization,nitrification,denitrification and ammonia volatilization);and(iii)determine whether d15N of soils can be used as an indicator of N cycling in this semi-arid grassland.Methods The field experiment was conducted within the long-term(17-year)grazing enclosures in a semi-arid grassland in Inner Mongolia.Five grazing intensities(0.00,1.33,2.67,4.00 and 5.33 sheep ha1)were designed.d15N values of topsoils(0–10 cm),surface soils(0–2 cm)and plants were measured in 2006.Differences in d15N of soils and plants between the five grazing intensities were examined.Rates of four soil N cycling processes were measured periodically during the 2005 and 2006 growing seasons.The d15N values of topsoils were linked to the four N cycling processes to investigate their relationships.Important Findings The d15N values of topsoils(5.20–5.96&)were substantially higher than the d15N values of plants(2.51–2.93&)and surface soils(1.44–2.92&)regardless of grazing intensities.The 15N-depleted N losses during microbial decomposition of organic matter in concert with the downward movement of residual substrate over time are the possible causes of higher d15N values in topsoils than in surface soils.In addition,the d15N values of topsoils were positively correlated with the d15N values of both plants and surface soils.Grazing,especially the high-intensity grazing(5.33 sheep ha1),resulted in a significant decrease in d15N of surface soils.However,no statistically significant variations in d15N of topsoils and plants were found in response to grazing.The d15N values of topsoils exhibited significant dependence on the cumulative rates of NH3 volatilization,net nitrification and denitrification in 2005 but not in 2006. | Yuqing Xu Jicheng He Weixin Cheng Xuerong Xing Linghao Li | 2010 | Journal of Plant Ecology2010，3，3： | 12 |
| 2 | Tribological properties of nanometer cerium oxide as additives in lithium grease显示文摘This paper presents a comparative study of the influence of nanometer-CeO_2(nano-CeO_2) and temperature on tribological and lubricating properties of lithium grease. The morphology and structure of nanocrystals were characterized by means of transmission electron microscopy(TEM) and X-ray diffraction(XRD), respectively. Friction and wear tests were conducted on the friction and wear tester.Results show that the lithium grease with addition of nanometer-CeO_2 has much better friction-reducing and anti-wear performance than that of base grease. When the additive in grease is 0.6 wt%, the friction coefficient(COF) and wear scar diameter(WSD) decrease by 28% and 13% comparing with base grease,respectively. The base grease and grease with 0.6 wt% nanometer-CeO_2 both possess the lowest average COF and wear width at 50 ℃. The worn surface morphology after friction test was analyzed by scanning electron microscopy(SEM) and NANOVEA three-dimensional profilometer. Under the lubrication of the lithium grease containing 0.6 wt% nano-CeO_2. few shallow furrows can be observed on the quite smoothed surface and the WSD decreased. Moreover, It was found that the nano-CeO_2 has been incorporated into the surface protective and lubricious layer by energy dispersive spectrometer(EDS) analysis. | Qiang He Anling Li Yachen Guo Songfeng Liu Yong Zhang Linghao Kong | 2018 | Journal of Rare Earths2018，36，2： | 6 |
| 3 | Novel Starch/Chitosan Blending Membrane: Antibacterial, Permeable and Mechanical Properties显示文摘 | Liu Fujun Qin Bing He Linghao | 2009 | Carbohydrate Polymers2009，78，1： | 1 |
| 4 | A periodic DFT study on adsorption of small molecules(CH4,CO,H2O,H2S,NH3)on the WO3(001) surface-supported Au显示文摘Gas molecules(such as CH4,CO,H2O,H2S,NH_3)adsorption on the pure and Au-doped WO3(001)surface have been studied by Density functional theory calculations with generalized gradient approximation.Based on the the calculation of adsorption energy,we found the most stable adsorption site for gas molecules by comparing the adsorption energies of different gas molecules on the WO3(001)surface.We have also compared the adsorption energy of five different gas molecules on the WO3(001)surface,our calculation results show that when the five kinds of gases are adsorbed on the pure WO3(001)surface,the order of the surface adsorption energy is CO>H2S>CH4>H2O>NH3.And the results show that NH3 is the most easily adsorbed gas among the other four gases adsorbed on the surface of pure WO3(001)surface.We also calculated the five different gases on the Au-doped WO3(001)surface.The order of adsorption energy was found to be different from the previous calculation:CO>CH4>H2S>H2O>NH3.These results provide a new route for the potential applications of Au-doped WO3 in gas molecules adsorption. | Long Lin Jingtao Huang Weiyang Yu Chaozheng He Hualong Tao Yonghao Xu Linghao Zhu Pengtao Wang Zhanying Zhang | 2020 | Communications in Theoretical Physics2020，72，3： | 1 |
| 5 | Novel starch/chitosan blending membrane: Antibacterial,permeable and mechanical properties显示文摘 | LIU Fujun QIN Bing HE Linghao | 2009 | Carbohydrate Polymers2009，78，1： | 1 |
| 6 | Novel starch / chitosan blending membrane : Antibacterial, permeableand mechanical properties 显示文摘 | Liu Fujun Qin Bing He Linghao | 2009 | Carbohydrate Polymers2009，78，： | 1 |
| 7 | Synthesis and Characterization of mercaptoacetic acid-modified ZnO nanoparticles显示文摘 | Rui Song Ying Liu Linghao He | 2008 | Solid State Sciences2008，10，11： | 1 |
| 8 | Novel starch/chitosanblending membrane:Antibacterial,permeable and mechanicalproperties显示文摘 | Liu Fujun Qin Bing He Linghao | 2009 | Carbohydr Polym2009，78，1： | 1 |
| 9 | miR?204-5p promotes the adipogenic differentiation of human adipose-derivedmesenchymal stem cells by modulating DVL3 expression and suppressing Wnt/β-cateninsignaling显示文摘 | Honghui He Ke Chen Fang Wang Liling Zhao Xinxing Wan Linghao Wang Zhaohui Mo | 2015 | International Journal of Molecular Medicine2015，，6： | 1 |
| 10 | Novel starch/chitosan blending membrane: Antibacterial, permeable and mechanical properties 显示文摘 | LIU Fujun QIN Bing HE Linghao | 2009 | Carbohydrate Polymers2009，78，1： | 1 |
| 11 | Novel stare显示文摘 | Fujun Liu Bing Qin Linghao He | 2009 | Carbohydrate polymers2009，78，1： | 1 |
| 12 | Novel starch/chitosan blending membrane: Antibacterial, permeable and mechanical properties 显示文摘 | Fujun Liu Bing Qin Linghao He | 2009 | Carbohydrate Polymers2009，78，： | 1 |
| 13 | Formation of calcium carbonate films on chitosan substrates in the presence of Polyacrylic acid 显示文摘 | Linghao He Rui Xue Rui Song | 2009 | Journal of Solid State Chemistry2009，182，： | 1 |
| 14 | Novel starch/chitosan blending membrane:antibacterial,permeable and mechanical properties显示文摘 | LIU Fujun QIN Bing HE Linghao | 2009 | Carbohydrate Polymers2009，78，1： | 1 |
| 15 | A redox-responsive self-assembling COA-4-arm PEG prodrug nanosystem for dual drug delivery suppresses cancer metastasis and drug resistance by downregulating hsp90 expression显示文摘Metastasis and resistance are main causes to affect the outcome of the current anticancer therapies.Heat shock protein 90(Hsp90)as an ATP-dependent molecular chaperone takes important role in the tumor metastasis and resistance.Targeting Hsp90 and downregulating its expression show promising in inhibiting tumor metastasis and resistance.In this study,a redox-responsive dual-drug nanocarrier was constructed for the effective delivery of a commonly used chemotherapeutic drug PTX,and a COAmodified 4-arm PEG polymer(4PSC)was synthesized.COA,an active component in oleanolic acid that exerts strong antitumor activity by downregulating Hsp90 expression,was used as a structural and functional element to endow 4PSC with redox responsiveness and Hsp90 inhibitory activity.Our results showed that 4PSC/PTX nanomicelles efficiently delivered PTX and COA to tumor locations without inducing systemic toxicity.By blocking the Hsp90 signaling pathway,4PSC significantly enhanced the antitumor effect of PTX,inhibiting tumor proliferation and invasiveness as well as chemotherapy-induced resistance in vitro.Remarkable results were further confirmed in vivo with two preclinical tumor models.These findings demonstrate that the COA-modified 4PSC drug delivery nanosystem provides a potential platform for enhancing the efficacy of chemotherapies. | Yi Zhou Yingling Miao Qiudi Huang Wenwen Shi Jiacui Xie Jiachang Lin Pei Huang Chengfeng Yue Yuan Qin Xiyong Yu He Wang Linghao Qin Jianhai Chen | 2023 | Acta Pharmaceutica Sinica B2023，13，7： | 0 |
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