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Selective and stable elimination of endosymbionts from multiple-infected whitefly Bemisia tabaci by feeding on a cotton plant cultured in antibiotic solutions

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Insect Science 2020年第5期27卷 964-974页

作者： Dong-Xiao Zhao zhi-Chun Zhang hong-Tao niu Hui-Fang Guo Institute of Plant Protection Jiangsu Academy of Agricultural SciencesNanjingChina

The maternally heritable endosymbiont provides many ecosystem *** elimination of a specific symbiont and establishment of experimental host lines lacking certain symbionts enable the roles of a given symbiont to be *** whitefly Bemisia tabaci(Gennadius)in China harbors obligate symbiont Portiera infecting each in-dividual,as well as facultative symbionts,such as Hamiltonella,Rickettsia and Cardinium,with co-infections occurring relatively *** far no studies have evaluated the selectivity and efficacy of a specific symbiont elimination using antibiotics in whiteflies co-infected with different ***,no success has been achieved in estab-lishing certain symbiont-free *** *** this study,we treated Hamiltonella infected *** line,Hamiltonella-Rickettsia-co infected line and Hamiltonella-Cardinium co-infected line by feeding *** adults with cotton plants cultured in water containing ri-fampicin,ampicillin or a mixture of them,aiming to selectively curing symbiont infections and establishing stable symbiont-free *** found ampicillin selectively eliminated Cardinium without afecting Portiera,Hamiltonella and Rickettsia,although they coex-isted in the same host ***,all of the symbionts considered in our study can be removed by *** reduction of facultative symbionts occurred at a much quicker pace than obligate symbiont Portiera during rifampicin ***,we measured the stability of symbiont elimination in whitefly successive generations and established Rickettsia-infected and Cardinium-infected lines which are absent in natural *** results provide new protocols for selective elimination of symbionts co-existing in a host and establishment of different symbiont-infected host lines.

关键词： antibiotic treatment Bemisia tabaci co-infections endosymbionts infection frequency

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Models to predict sunlight-induced photodegradation rates of contaminants in wastewater stabilisation ponds and clarifiers

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Water Science and Engineering 2019年第4期12卷 293-297页

作者： Xi-zhi niu Department of Chemical and Environmental Engineering and Arizona Laboratory for Emerging Contaminants University of Arizona

Two kinetic models were established for conservative estimates of photodegradation rates of contaminants under sunlight irradiation,in particular for wastewater stabilisation ponds and clarifiers in conventional wastewater treatment *** two models were designated for(1)contaminants with high photolytic rates or high photolytic quantum yields,whose photodegradation is unlikely to be enhanced by aquatic photosensitisers;and(2)contaminants withstanding direct photolysis in sunlit waters but subjected to indirect *** effortlessly intelligible prediction procedure involves sampling and analysis of real water samples,simulated solar experiments in the laboratory,and transfer of the laboratory results to realise water treatment using the prediction *** similar models have been widely used for laboratory studies,this paper provides a preliminary example of translating laboratory results to the photochemical fate of contaminants in real waters.

关键词： Sunlight irradiation Photodegradation Contaminants Stabilisation ponds Solar water treatment

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Evaluation of phytoextracting cadmium and lead by sunflower,ricinus,alfalfa and mustard in hydroponic culture

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Journal of Environmental Sciences 2007年第8期19卷 961-967页

作者： niu zhi-xin SUN Li-na SUN Tie-heng LI Yu-shuang WANG hong Institute of Applied Ecology Chinese Academy of Sciences Shen yang 110016 China Shenyang University Key Laboratory of Environmental Engineering Shenyang 110044 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China

Soil contaminated with heavy metals cadmium （Cd） and lead （Pb） is hard to be remediated. Phytoremediation may be a feasible method to remove toxic metals from soil, but there are few suitable plants which can hyperaccumulate metals. In this study, Cd and Pb accumulation by four plants including sunflower （Helianthus annuus L.）, mustard （Brassicajuncea L.）, alfalfa （Medicago sativa L.）, ricinus （Ricinus communis L.） in hydroponic cultures was compared. Results showed that these plants could phytoextract heavy metals, the ability of accumulation differed with species, concentrations and categories of heavy metals. Values of BCF （bioconcentration factor） and TF （translocation factor） indicated that four species had dissimilar abilities of phytoextraction and transportation of heavy metals. Changes on the biomass of plants, pH and Eh at different treatments revealed that these four plants had distinct responses to Cd and Pb in cultures. Measurements should be taken to improve the phytoremediation of sites contaminated with heavy metals, such as pH and Eh regulations, and so forth.

关键词： phytoextraction heavy metals plants cadmium lead

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促排卵周期围着床期宫腔分泌物细胞因子表达与妊娠结局的关系初探

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生殖与避孕 2013年第3期33卷 154-158页

作者：张平贵牛志宏陈骞张爱军吴丹丹冯云上海交通大学医学院附属瑞金医院生殖医学中心上海200025

目的:探索体外受精促排卵周期围着床期宫腔分泌物细胞因子表达与妊娠结局的关系。方法:促排卵周期胚胎移植前宫腔分泌物63例(试验组),同时选取同年促排卵后直接行胚胎移植的171例作为对照组,以排除胚胎移植前取宫腔分泌物对妊娠结局的... 详细信息

目的:探索体外受精促排卵周期围着床期宫腔分泌物细胞因子表达与妊娠结局的关系。方法:促排卵周期胚胎移植前宫腔分泌物63例(试验组),同时选取同年促排卵后直接行胚胎移植的171例作为对照组,以排除胚胎移植前取宫腔分泌物对妊娠结局的影响。采用多重免疫分析方法检测宫腔分泌物中与胚胎种植有关17种调节因子(IL-1β、IL-2、IL-4、IL-5、IL-6、IL-7、IL-8、IL-10、IL-12(p70)、IL-13、Il-17、G-CSF、GM-CSF、IFN-γ、MCP-1、MIP-1β、TNF-α)的表达。试验组再根据妊娠结局进行分组,比较妊娠组和非妊娠组17种调节因子的表达谱。结果:患者的一般情况、促排卵数据及妊娠结局,试验组和对照组间均无统计学差异(P>0.05)。妊娠组IL-13(9.76±5.04 pg/ml)、IFN-γ(7.50±2.62 pg/ml)、MCP-1(17.5±9.63 pg/ml)水平均低于未妊娠组(分别为18.37±17.82 pg/ml、8.87±2.39 pg/ml和49.97±85.95 pg/ml),差异具有统计学意义(P0.05)。结论:胚胎移植前微量取样宫腔分泌物不影响临床结局;围种植窗期宫腔分泌物IL-13、IFN-γ以及MCP-1表达水平升高可能不利于妊娠。

关键词：体外受精-胚胎移植(IVF-ET) 宫腔分泌物内膜容受性细胞因子临床结局

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Influence of Soil-Structure Interaction Models on the Dynamic Responses of An Offshore Wind Turbine Under Environmental Loads

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China Ocean Engineering 2023年第2期37卷 218-231页

作者： TANG hong-ming YUE Min-nan YAN Yang-tian LI zhi-hao LI Chun niu Kai-lun School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093China

Offshore wind turbines(OWTs) suffer wind, wave and earthquake loads. The investigation of OWTs' dynamic response under environmental loads is essential for structural safety assessment. The soil-structure interaction(SSI)significantly affects the responses of OWT under environmental loads. However, there is few systematic research about the difference in the dynamic response of different SSI models under environmental loads. In order to solve the problem, the OWT is modeled by shell element, and several SSI models are built. The wind, wave and earthquake loads are taken into account. Moreover, the dynamic response, fatigue and buckling analysis are performed by ANSYS. The results indicate that SSI cannot be ignored in the dynamic response of the OWT under wind and wave loads. The SSI can decrease the displacement response of the OWT by 19% under wind and wave loads and reduce the fatigue damage of the pile. Multi-layer SSI can strongly influence the OWT's dynamic response under wind and wave loads or earthquake-only load. The vertical earthquake load increases the dynamic response in three ***, in order to simulate real environment, multi-layer SSI, soil damping and vertical SSI must be considered to evaluate the displacement response of the OWT under wind, wave and earthquake loads. The earthquake and gravity loads can cause more obvious response of the OWT than that of only wind and wave loads. The top and bottom of the tower are prone to occur buckling.

关键词： OWT soil structure interaction earthquake dynamic analysis structural damage

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Characterization of the Purified Glutathione S-transferases from Two Psocids Liposcelis bostrychophila and ***

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Agricultural Sciences in China 2010年第7期9卷 1008-1016页

作者： DOU Wei XIAO Li-sha niu Jin-zhi JIANG hong-bo WANG Jin-jun Key Laboratory of Entomology and Pest Control Engineering College of Plant Protection Southwest University Chongqing 400716 P.R. China

Glutathione S-transferases（GSTs） from Liposcelis bostrychophila Badonnel and ***（Enderlein）（Psocoptera：Liposcelididae） were purified by glutathione-agarose affinity chromatography,and characterized subsequently by their Michaelis-Menten kinetics toward the artificial substrates 1-chloro-2,4-dinitrobenzene（CDNB） and reduced glutathione（GSH）,*** specific activity of the purified GST toward CDNB was 2.3-fold higher in *** than in *** the specific activities of purified enzymes varied between the two species,the purification yields were ***-PAGE revealed one band at 23 kDa for both the *** of *** exhibited higher Michaelis-Menten constants（Km） but lower maximal velocity（Vmax） values than those of *** optimum pH for CDNB conjugation of *** and *** GSTs was 7.0 and 7.5,and optimum temperature was 35 and 40°C,*** kinetics showed that cibacron blue,curcumin,bromosulfalein,ethacrynic acid,and carbosulfan had excellent inhibitory effects on GSTs in both species,but the inhibitory effects of beta-cypermethrin,fenpropathrin,tetraethylthiuram disulfide,and diethyl maleate were not significant.

关键词： GSTs purification psocids xenobiotic compounds

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The Multi-parameter Test of Gravitational Wave Dispersion with Principal Component Analysis

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Research in Astronomy and Astrophysics 2024年第5期24卷 140-150页

作者： zhi-Chu Ma Rui niu Wen Zhao CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China

In this work, we consider a conventional test of gravitational wave(GW) propagation which is based on the phenomenological parameterized dispersion relation to describe potential departures from General Relativity(GR)along the propagation of GWs. But different from tests conventionally performed previously, we vary multiple deformation coefficients simultaneously and employ the principal component analysis(PCA) method to remedy the strong degeneracy among deformation coefficients and obtain informative posteriors. The dominant PCA components can be better measured and constrained, and thus are expected to be more sensitive to potential departures from the waveform model. Using this method we analyze ten selected events and get the result that the combined posteriors of the dominant PCA parameters are consistent with GR within 99.7% credible intervals. The standard deviation of the first dominant PCA parameter is three times smaller than that of the original dispersion parameter of the leading order. However, the multi-parameter test with PCA is more sensitive to not only potential deviations from GR but also systematic errors of waveform models. The difference in results obtained by using different waveform templates hints that the demands of waveform accuracy are higher to perform the multiparameter test with PCA. Whereas, it cannot be strictly proven that the deviation is indeed and only induced by systematic errors. It requires more thorough research in the future to exclude other possible reasons in parameter estimation and data processing.

关键词： gravitational waves-gravitation-black hole physics

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考虑轴颈倾斜的可倾瓦气体动压轴承静动态特性

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轴承 2025年第1期 46-54页

作者：牛光辉石明辉郭红张国龙郑州大学机械与动力工程学院郑州450001

针对制造装配误差及受载变形造成轴颈倾斜的问题,以可倾瓦气体动压轴承为研究对象,建立计入轴颈倾斜、瓦块摆动自由度的静动态特性分析模型,研究轴颈倾斜对定载荷下轴承偏心率、摩擦系数、量纲一的质量流量以及刚度系数、阻尼系数的影... 详细信息

针对制造装配误差及受载变形造成轴颈倾斜的问题,以可倾瓦气体动压轴承为研究对象,建立计入轴颈倾斜、瓦块摆动自由度的静动态特性分析模型,研究轴颈倾斜对定载荷下轴承偏心率、摩擦系数、量纲一的质量流量以及刚度系数、阻尼系数的影响规律,结果表明:轴颈倾斜造成气膜压力峰值向轴承一端偏移,且轴颈倾斜角越大,改变越明显;轴颈倾斜方向角的改变会造成轴承性能呈波动的变化规律。

关键词：滑动轴承气体动压轴承轴颈倾斜角偏心率摩擦系数动态性能

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Ar adsorptions on Al (111) and Ir (111) surfaces:a first-principles study

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Chinese Physics B 2012年第2期21卷 437-444页

作者： niu Wen-Xia Zhang hong Institution of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China College of Physical Science and Technology Sichuan UniversityChengdu 610065China

We investigate the adsorptions of Ar on Al （111） and Ir （111） surfaces at the four high symmetry sites, i.e., top, bridge, fcc- and hcp-hollow sites at the coverage of 0.25 monolayer （ML） using the density functional theory within the generalized gradient approximation of Perdew, Burke and Ernzerhof functions. The geometric structures, the binding energies, the electronic properties of argon atoms adsorbed on Al （111） and Ir （111） surfaces, the difference in electron density between on the Al （111） surface and on the Ir （111） surface and the total density of states are calculated. Our studies indicate that the most stable adsorption site of Ar on the Al （111） surface is found to be the fcc-hollow site for the （2 x 2） structure. The corresponding binding energy of an argon atom at this site is 0.538 eV/Ar atom at a coverage of 0.25 ML. For the Ar adsorption on Ir （111） surface at the same coverage, the most favourable site is the hcp-hollow site, with a corresponding binding energy of 0.493 eV. The total density of states （TDOS） is analysed for Ar adsorption on Al （111） surface and it is concluded that the adsorption behaviour is dominated by the interaction between 3s, 3p orbits of Ar atom and the 3p orbit of the base Al metal and the formation of sp hybrid orbital. For Ar adsorption on Ir （111） surface, the conclusion is that the main interaction in the process of Ar adsorption on Ir （111） surface comes from the 3s and 3p orbits of argon atom and 5d orbit of Ir atom.

关键词： density-functional theory binding energy adsorption electronic structure

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Fabrication of Pd-Nb bimetallic doped organosilica membranes by different metal doping routes for H_(2)/CO_(2) separation

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Chinese Journal of Chemical Engineering 2021年第8期34卷 67-75页

作者： Hengfei Zhang Yibin Wei Shufeng niu hong Qi State Key Laboratory of Material-Oriented Chemical Engineering Membrane Science and Technology Research CenterNanjing Tech UniversityNanjing 210009China hongyi Ceramic Membranes Research Institute Nanjing Hongyi Ceramic Nanofiltration Membranes Co.Ltd.Nanjing 210009China

Monometallic doping has proved its superiority in improving either permselectivity or H_(2) permeability of organosilica membranes for H_(2)/CO_(2) separation,but it is still challenging to break the trade-off ***,we report a series of Pd-Nb bimetallic doped 1,2-bis(triethoxysilyl)ethane(Pd-Nb-BTESE,PNB)membranes with different metal doping routes for simultaneously improving H_(2) permeance and H_(2)/CO_(2) permselectivity by the synergetic effects of Pd and *** doped Pd can exist in the BTESE network as nanoparticles while the doped Nb is incorporated into BTESE network forming Nb-O-Si covalent *** metal doping routes significantly influence the microstructure of PNB networks and gas separation performance of the PNB *** found that the PNB membrane with Pd doping priority(PNB-Pd)exhibited the highest surface area and pore volume,comparing with Nb doping priority(PNB-Nb)or Pd-Nb simultaneous doping(PNB-PdNb).The PNB-Pd membrane could not only exhibit an excellent H_(2) permeance of~10^(−6) mol·m^(−2)·s^(−1)·Pa^(−1) but also a high H_(2)/CO_(2) permselectivity of *** findings may provide novel insights into preparation of bimetallic doped organosilica membranes with excellent H_(2)/CO_(2) separation performance.

关键词： Hydrogen Separation Membranes Bimetallic doping Organosilica

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