mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
ABA-Mediated Inhibition of Germination Is Related to the Inhibition of Genes Encoding Cell-Wall Biosynthetic and Architecture:Modifying Enzymes and Structural Proteins in Medicago truncatula Embryo Axis

Radicle emergence and reserves mobilization are two distinct programmes that are thought to control germination. Both programs are influenced by abscissic acid (ABA) but how this hormone controls seed germination is still poorly known. Phenotypic and microscopic observations of the embryo axis of Medicago truncatula during germination in mitotic inhibition condition triggered by 10 μM oryzalin showed that cell division was not required to allow radicle emergence. A suppressive subtractive hybridization showed that more than 10% of up-regulated genes in the embryo axis encoded proteins related to cell-wall biosynthesis. The expression of α-expansins, pectin-esterase, xylogucan-endotransglycosidase, cellulose synthase, and extensins was monitored in the embryo axis of seeds germinated on water, constant and transitory ABA. These genes were overexpressed before completion of germination in the control and strongly inhibited by ABA. The expression was re-established in the ABA transitory-treatment after the seeds were transferred back on water and proceeded to germination. This proves these genes as contributors to the completion of germination and strengthen the idea that cell-wall loosening and remodeling in relation to cell expansion in the embryo axis is a determinant feature in germination. Our results also showed that ABA controls germination through the control of radicle emergence, namely by inhibiting cell-wall loosening and expansion.
Eurasian Snow Cover Variability and Its Association with Summer Rainfall in China

This study investigates the statistical linkage between summer rainfall in China and the preceding spring Eurasian snow water equivalent (SWE),using the datasets of summer rainfall observations from 513 stations,satellite-observed snow water equivalent,and atmospheric circulation variables in the NCEP/NCAR reanalysis during the period from 1979 to 2004.The first two coupled modes are identified by using the singular value decomposition (SVD) method.The leading SVD mode of the spring SWE variability shows a coherent negative anomaly in most of Eurasia with the opposite anomaly in some small areas of the Tibetan Plateau and East Asia.The mode displays strong interannual variability,superposed on an interdecadal variation that occurred in the late 1980s,with persistent negative phases in 1979-1987 and frequent positive phases afterwards.When the leading mode is in its positive phase,it corresponds to less SWE in spring throughout most of Eurasia.Meanwhile,excessive SWE in some small areas of the Tibetan Plateau and East Asia,summer rainfall in South and Southeast China tends to be increased,whereas it would be decreased in the up-reaches of the Yellow River.In recent two decades,the decreased spring SWE in Eurasia may be one of reasons for severe droughts in North and Northeast China and much more significant rainfall events in South and Southeast China.The second SVD mode of the spring SWE variability shows opposite spatial variations in western and eastern Eurasia,while most of the Tibetan Plateau and East Asia are in phase.This mode significantly correlates with the succeeding summer rainfall in North and Northeast China,that is,less spring SWE in western Eurasia and excessive SWE in eastern Eurasia and the Tibetan Plateau tend to be associated with decreased summer rainfall in North and Northeast China.
Marine Meteorology Research Progress of China from 2003 to 2006

The progress in marine meteorology research achieved by scientists in China during the four-year period from 2003 to 2006 is summarized under four categories: marine disaster study,typhoon over the ocean,ocean-atmosphere monitoring technology,and ocean-atmosphere forecasting technology.Compared to the previous four years,many more first-hand datasets have been obtained and more scientific issues have been addressed.In particular,many contributions have been made by young scientists.A brief statement on the research strategy of marine meteorology in China for the coming years is given at the end.
A Re-examination of Density Effects in Eddy Covariance Measurements of CO_2 Fluxes

Corrections of density effects resulting from air-parcel expansion/compression are important in interpreting eddy covariance fluxes of water vapor and CO_2 when open-path systems are used.To account for these effects,mean vertical velocity and perturbation of the density of dry air are two critical parameters in treating those physical processes responsible for density variations.Based on various underlying assumptions,different studies have obtained different formulas for the mean vertical velocity and perturbation of the density of dry air,leading to a number of approaches to correct density effects.In this study,we re-examine physical processes related to different assumptions that are made to formulate the density effects.Specifically,we re-examine the assumptions of a zero dry air flux and a zero moist air flux in the surface layer,used for treating density variations,and their implications for correcting density effects.It is found that physical processes in relation to the assumption of a zero dry air flux account for the influence of dry air expansion/compression on density variations.Meanwhile,physical processes in relation to the assumption of a zero moist air flux account for the influence of moist air expansion/compression on density variations.In this study,we also re-examine mixing ratio issues.Our results indicate that the assumption of a zero dry air flux favors the use of the mixing ratio relative to dry air,while the assumption of a zero moist air flux favors the use of the mixing ratio relative to the total moist air.Additionally,we compare different formula for the mean vertical velocity,generated by air-parcel expansion/compression,and for density effect corrections using eddy covariance data measured over three boreal ecosystems.
Linkage Between Mei-yu Precipitation and North Atlantic SST on the Decadal Timescale

This paper investigates the relationship between mei-yu and North Atlantic sea surface temperature anomalies (SSTA).Results show that they are significantly associated with each other on the decadal timescale.Both mei-yu precipitation and mei-yu duration are characterized by significant decadal variability.Their decadal components are closely correlated with a triple mode of North Atlantic SSTA in the preceding winter.Regression analysis demonstrates that the wintertime North Atlantic SSTA may impose a delayed impact on East Asia Summer Monsoon (EASM) circulation and mei-yu on the decadal timescale.The persistency of SSTA plays an important role during this course.The triple SSTA mode can persist from winter until late spring.It is suggested that the springtime SSTA may excite a stationary wave-train propagating from west Eurasia to East Asia and exert an impact on mei-yu.
Effects of a Building's Density on Flow in Urban Areas

The effects of a building's density on urban flows are investigated using a CFD model with the RNG k - ε turbulence closure scheme.Twenty-seven cases with different building's density parameters (e.g.,building and street-canyon aspect ratios) are numerically simulated.As the building's density parameters vary,different flow regimes appear.When the street canyon is relatively narrow and high,two counterrotating vortices in the vertical direction are generated.The wind speed along streets is mainly affected by the building's length.However,it is very difficult to find or generalize the characteristics of the street-canyon flows in terms of a single building's density parameter.This is because the complicated flow patterns appear due to the variation of the vortex structure and vortex number.Volume-averaged vorticity magnitude is a very good indicator to reflect the flow characteristics despite the strong dependency of flows on the variation of the building's density parameters.Multi-linear regression shows that the volume-averaged vorticity magnitude is a strong function of the building's length and the street-canyon width.The increase in the building's length decreases the vorticity of the street-canyon flow,while,the increase in the street-canyon width increases the vorticity.
Synchronization of Radar Observations with Multi-Scale Storm Tracking

The 3-D radar reflectivity data has become increasingly important for use in data assimilation towards convective scale numerical weather prediction as well as next generation precipitation estimation.Typically,reflectivity data from multiple radars are objectively analyzed and mosaiccd onto a regional 3-D Cartesian grid prior to being assimilated into the models.One of the scientific issues associated with the mosaic of multi-radar observations is the synchronization of all the observations.Since radar data is usually rapidly updated (～every 5-10 min),it is common in current multi-radar mosaic techniques to combine multiple radar' observations within a time window by assuming that the storms are steady within the window.The assumption holds well for slow evolving precipitation systems,but for fast evolving convective storms,this assumption may be violated and the mosaic of radar observations at different times may result in inaccurate storm structure depictions.This study investigates the impact of synchronization on storm structures in multiple radar data analyses using a multi-scale storm tracking algorithm.
Synthesis and Characterization of Novel Temperature and pH Responsive Hydroxylpropyl Cellulose-based Graft Copolymers

In this study, double-hydrophilic hydroxylpropyl cellulose (HPC) based copolymers with poly(Nisopropylacrylamide) (PNIPAM) and poly(acrylic acid) (PAA) as graft chains were synthesized and characterized. The release behavior of drug-loaded micelles was studied. The results show that the hydrophilicity of copolymers improves as the pH increases, whereas the hydrophobicity of copolymers enhances as the temperature increases, and all the phase behaviors are reversible. The diameter of micelles decreases and then increases with pH increase. It shows different micellizing behavior under acidic and basic conditions according to the temperature increase. In vitro release experiments, which used theophylline as a model drug, show that the micelles enhance pH sensitivity in the release process.
肝紫斑病

患者女,46岁,以腹胀、纳差2个月入院.患者曾就诊于当地医院,B超示:大量腹水,卵巢占位性病变可能.行开腹探查和双侧卵巢等附件切除术,术后病理示:双卵巢及输卵管组织慢性炎症,右卵巢黄体出血,腹水为渗出液.未见好转,遂转我院.
高油大豆沈农9号的选育及高产栽培技术

1 选育经过1.1 选育目标通过杂交育种手段,选育出产量比对照品种高5%左右,综合抗性好,抗旱性强,抗或中抗主要病虫害,适于加工豆油(脂肪含量在21.5%以上),适于我国北方春大豆晚熟组区域种植的高产稳产型品种.
杂交水稻新组合株两优15高产优质制种技术

株两优15(株1 S/H 98-15)是湖南省贺家山原种场育成的两系杂交早稻新组合,2007年通过湖南省品种审定委员会审定.本文介绍了该组合的亲本特性和高产优质制种技术.
乐昌含笑育苗试验研究

对乐昌含笑种子进行实生育苗试验研究,结果表明:乐昌含笑种子萌发最适宜的土壤温度为15.93℃以上,地表温度为16.12℃;发芽率最高为66%,最低为56%,平均为60.4%;1年生苗高最高为77.1 cm,最低为26.0 cm,平均为44.3 cm;地径最大为12.13 mm,最小为5.05 mm,平均为8.32 mm;苗期高、径生长成正比.
紫花南桔梗工厂化育苗技术研究

通过对野生紫花南桔梗进行离体快繁技术的研究,解决生产栽培中优良种源短缺问题.方法:用野生紫花南桔梗幼茎为外植体,以MS为基本培养基,附加不同浓度的激素进行培养.结果表明:用MS+BA 2.0 mg/L+NAA 0.2 mg/L诱导培养,60 d可获得丛生芽;继代用MS+BA 0.5 mg/L+NAA 0.2 mg/L培养,增殖率高达20倍以上;用1/2 MS+NAA 0.2 mg/L培养20 d可获得生根植株.本研究得出的方法可为栽培桔梗提供大量优良种苗.
披针叶黄华种子硬实与萌发特性研究

对披针叶黄华种子的形态特征、种子大小、千粒重和硬实率进行了研究,并采用浓硫酸和热水浸种及机械摩擦处理破除种子硬实,同时,对其发芽的温度和发芽床进行了研究.结果表明:披针叶黄华种子长4.690 mm,宽3.616 mm,厚2.328 mm,净度为98.9%,千粒重为27.64 g,自然成熟后硬实率达85.5%;破除硬实方法中,以沙子研磨的处理效果最好,种子发芽率达89.2%,浓硫酸处理5 min也可使种子发芽率显著提高,热水处理效果最差;23℃(14 h)/15℃(10 h)的变温条件是披针叶黄华种子发芽的最适温度,20℃和25℃亦为较适宜的发芽温度;在滤纸、双层纱布上培养,其种子发芽率高于在河沙和沙质土壤上的.
马铃薯脱毒种薯(苗)病毒检测技术研究进展

马铃薯系无性繁殖作物,易受病毒侵染而造成植株体内病毒积累,导致种性退化,品质和产量下降.本文主要介绍了常见马铃薯病毒病类型的种类表现、传播途径,脱毒种薯(苗)的检测方法及其应用,讨论了三类检测方法的优缺点,并对RT-PCR检测方法进行了美好展望.
Flotation of aluminosilicate minerals using alkylguanidine collectors

The flotation mechanism of aluminosilicate minerals using alkylguanidine collectors was studied through flotation experiments, Zeta potential measurements and FT-IR spectrum analysis. It is shown that kaolinite, illite and pyrophyllite all exhibit good floatability with alkylguanidines as collectors at pH 4-12. The flotation recoveries rise with the increase of the carbon chain length. Isoelectric point(IEP) is determined to be 3.5, 3.0 and 2.3 for kaolinite, illite and pyrophyllite, respectively. However, it is anomalous that the presence of cationic collectors has less influence on the negatively charged mineral surfaces. It is explained by the special structure of guanidine which is one of the strongest bases, having two -NH2 groups. One of them maybe interacts with minerals by electrostatic forces, and the other maybe forms hydrogen bonding with OH- ions on the aluminosilicate surfaces or in the aqueous solution, increasing the density of negative charge on the aluminosilicate surface and leading unpronounced positive charge to increase on the aluminosilicate. By combining the flotation tests, Zeta potential and FTIR measurements above, the interaction mechanism can be concluded. The simultaneous presence of cationic and neutral amine groups makes it possible for SAG cation to bind on three aluminosilicate minerals by both electrostatic attraction and hydrogen bonding. While in acidic medium, the interaction of the alkylguanidines on the aluminosilicate surfaces is mainly by means of electrostatic force and hydrogen bond; in the alkaline medium, it is by the way of electrostatic effect and hydrogen bond.
Correlation between Imprint and Long-Time Polarization Reversal under Low Fields in Ferroelectric Thin Films

Time interval of slow polarization reversal in ferroelectric thin films is broadened over more than two decades to disobey the classical Kolmogorov-A vrami-Ishibashi (KAI) equation as the applied field approaches the coercive field of domain switching. The assumption of a Lorentzian distribution of logarithmic waiting times of reversed domain nucleation in this equation can resolve this dilemma. In our work, we explain this equation from the coercive-voltage distribution in thin films, and derive a similar function to describe slow polarization reversal from the consideration of a long-time imprint effect rather than the KAI model.
Electric-Wiggler-Enhanced Three-Quantum Scattering and the Output Power Affected by this Scattering in a Free-Electron Laser

We derive the cross section of scattering through the three-quantum interaction of an electron with the incident laser field, the emitted photon, and an axial electrostatic field produced by the magnetic wiggler in the magnetic wiggler acting as the sole zeroth-order perturbing classical field in the first free-electron laser (FEL). In the derivation, we apply quantum-wiggler electrodynamics (QWD). We find that this scattering predominates the usual two-quantum scattering. The output power of spontaneous free-electron two-quantum Stark emission driven by the above electrostatic field attenuated by the three-quantum scattering agrees within a factor of 10 with the measured power in the case of the first FEL.
Threshold Quantum Secret Sharing of Secure Direct Communication

We propose a (t, n)-threshold quantum secret sharing protocol of secure direct communication following some ideas of Zhang's protocol [Phys. Lett. A 342 (2005) 60] and Tokunaga et al.'s protocol [Phys. Rev. A 71 (2005) 012314]. The sender distributes the classical secret shares to his or her n agents and each agent owns a secret share in advance. The sender's secure direct communication message can be extracted by an agent subset by collaboration in such a way that at least t or more agents can obtain the secret message with the mutual assistances but any t - 1 or fewer agents cannot. In contrast to the previous multiparty quantum secret sharing protocols in which the sender's secret message can be recovered only if all the agents collaborate, our protocol is more practical and more flexible.
Material parameter equation for rotating elliptical spherical cloaks

By using the coordinate transformation method, we have deduced the material parameter equation for rotating elliptical spherical cloaks and carried out simulation as well. The results indicate that the rotating elliptical spherical cloaking shell, which is made of meta-materials whose permittivity and permeability are governed by the equation deduced in this paper, can achieve perfect invisibility by excluding electromagnetic fields from the internal region without disturbing any external field.
On dynamics of elastic rod based on exact Cosserat model

The analysis of kinematics and dynamics of an elastic rod with circular cross section is studied on the basis of exact Cosserat model under consideration of the tension and shear deformation of the rod. The dynamical equations of a rod with arbitrary initial shape are established in general form. The dynamics of a straight rod under axial tension and torsion is discussed as an example. In discussion of static stability in the space domain the Greenhill criteria of stability and the Euler load are corrected by the influence of tension and shear strain. In analysis of dynamical stability in the time domain it is shown that the Lyapunov and Euler stability conditions of the rod in space domain are the necessary conditions of Lyapunov's stability in the time domain. The longitudinal, torsional and lateral vibrations of a straight rod based on exact model are discussed, and an exact formula of free frequency of lateral vibration is obtained. The free frequency formulas of various simplified models, such as the Rayleigh beam, the Kirchhoff rod, and the Timoshenko beam, can be seen as special cases of the exact formula under different conditions of simplification.
Cdk5在突触可塑性和学习记忆中的作用

@@ 细胞周期素依赖性蛋白激酶5(Cdk5)属于脯氨酸限定性丝/苏氨酸(Ser/Thr)细胞周期素依赖性蛋白激酶的家族成员.尽管Cdk5与其它家族成员有高度同源性,但它并不依赖细胞周期素,也不调节细胞周期,只有当它与激活剂p35、p39、p25或p29结合时才会表现出激酶活性.
耕作对东北黑土团聚体粒级分布及其稳定性的短期影响

土壤团聚体粒级分布是作物发芽和出苗以及根系发展的重要影响因子,其团聚作用在土壤固碳过程中具有不可或缺的贡献,团聚体的结构性破坏将导致土壤有机质的流失,而团聚体稳定性直接影响着土壤侵蚀程度.
Dehydrogenation of n-butane over vanadia catalysts supported on silica gel

VOx/SiO_2 catalysts prepared by impregnation method were used for catalytic dehydrogenation of n-butane to butenes and characterized by X-ray diffraction,FT-IR,UV-vis,Raman,and BET measurements.The effects of VO_x loading and the reaction temperature on the VO_x/SiO_2 catalysts and their catalytic performances for the dehydrogenation of n-butane were studied.When the VO_x loading was 12% g/gcat and reaction temperature was between 590 ℃ and 600 ℃,n-butane conversion and butenes yields reached the highest value under H2 flux of 10 ml/min and n-butane flux of 10 ml/min.Product distribution,such as the ratio of 2-butene to 1-butene and the ratio of cis-2-butene to trans-2-butene,was mainly influenced by the reaction temperature.
Modeling the oxidative coupling of methane：Heterogeneous chemistry coupled with 3D flow field simulation

The oxidative coupling of methane (OCM) over titanate perovskite catalyst has been developed by three-dimensional numerical simulations of flow field coupled with heat transfer as well as heterogeneous kinetic model.The reaction was assumed to take place both in the gas phase and on the catalytic surface.Kinetic rate constants were experimentally obtained using a ten step kinetic model.The simulation results agree quite well with the data of OCM experiments,which were used to investigate the effect of temperature on the selectivity and conversion obtained in the methane oxidative coupling process.The conversion of methane linearly increased with temperature and the selectivity of C_2 was practically constant in the temperature range of 973-1073 K.The study shows that CFD tools make it possible to implement the heterogeneous kinetic model even for high exothermic reaction such as OCM.
Kinetic studies of the oxidative coupling of methane over the Mn/Na_2WO_4/SiO_2 catalyst

Oxidative coupling of methane is a direct way to obtain C_2 hydrocarbon,and Mn-Na-W/SiO_2 catalyst is the most promising among all the catalysts.The 2%Mn/5%Na_2WO_4/SiO_2 catalyst was prepared by the incipient wetness impregnation method.A 7-step heterogeneous reaction model of the oxidative coupling of methane to C_2 hydrocarbons was conducted by co-feeding methane and oxygen at a total pressure of 1 bar over the catalyst.The kinetic measurements were carried out in a micro-catalytic fixed bed reactor.The kinetic data were obtained at the appropriate range of reaction conditions (4 kPa＜P_(O_2) ＜20 kPa,20 kPa＜P_(CH_4) ＜80 kPa,800℃＜T＜900℃).The proposed reaction kinetic scheme consists of three primary and four consecutive reaction steps.The conversions of hydrocarbons and carbon oxides were evaluated by applying Langrnuir-Hinshelwood type rate equations.Power-law rate equation was applied only for the water-gas shift reaction.In addition,the effects of operating conditions on the reaction rate were studied.The proposed kinetic model can predict the conversion of methane and oxygen as well as the yield of C_2 hydrocarbons and carbon oxides with an average accuracy of ±15%.
MnO_x/Al_2O_3/Ce_(0.45)Zr_(0.45)M_(0.10)O_y (M = Mn,Y,La) catalysts used for ethanol catalytic combustion

MnO_x/Al_2O_3/Ce_(0.45)Zr_(0.45)M_(0.10)Oy (M = Mn,Y,La) catalysts were prepared by impregnation method and characterized by BET,TPR and XRD analyses.The catalytic activities toward ethanol combustion were investigated in a microreactor.The results demonstrated that the catalytic activity of MnO_x/Al_2O_3/Ce_(0.50)Zr_(0.50)O_2 monolithic catalyst could be improved by doping Mn,Y and La into Ce_(0.50)Zr_(0.50)O_2.When doping Y into Ce0.50Zr0.50O2,the catalyst MnO_x/Al_2O_3/Ce_(0.45)Zr_(0.45)Y_(0.10)O_(1.95) showed the highest activity.The 100% conversion temperature of ethanol was 230 ℃.Furthermore,once the conversion of ethanol started,the complete conversion was quickly achieved.The doping of Mn,Y and La led to better activity for ethanol combustion and lower temperature reduction peaks in TPR profiles.The doping of Mn resulted in enhanced oxygen storage capacity (OSC),larger area of the reduction peaks,and excellent reactivity,and the doping of Y resulted in the lowest reduction temperature and the best activity.
Natural gas pyrolysis in double-walled reactor tubes using thermal plasma or concentrated solar radiation as external heating source

The thermal pyrolysis of natural gas as a clean hydrogen production route is examined.The concept of a double-walled reactor tube is proposed and implemented.Preliminary experiments using an external plasma heating source are carded out to validate this concept.The results point out the efficient CH_4 dissociation above 1850 K (CH_4 conversion over 90%) and the key influence of the gas residence time.Simulations are performed to predict the conversion rate of CH_4 at the reactor outlet,and are consistent with experimental tendencies.A solar reactor prototype featuring four independent double-walled tubes is then developed.The heat in high temperature process required for the endothermic reaction of natural gas pyrolysis is supplied by concentrated solar energy.The tubes are heated uniformly by radiation using the blackbody effect of a cavity-receiver absorbing the concentrated solar irradiation through a quartz window.The gas composition at the reactor outlet,the chemical conversion of CH_4,and the yield to H_2 are determined with respect to reaction temperature,inlet gas flow-rates,and feed gas composition.The longer the gas residence time,the higher the CH4 conversion and H_2 yield,whereas the lower the amount of acetylene.A CH_4 conversion of 99% and H_2 yield of about 85% are measured at 1880 K with 30% CH_4 in the feed gas (6 L/min injected and residence time of 18 ms).A temperature increase from 1870 K to 1970 K does not improve the H_2 yield.