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| 1 | Curvature Estimates for the Level Sets of Solutions to the Monge-Ampère Equation det D^2u = 1显示文摘For the Monge-Amp`ere equation det D2u = 1, the authors find new auxiliary curvature functions which attain their respective maxima on the boundary. Moreover, the upper bounded estimates for the Gauss curvature and the mean curvature of the level sets for the solution to this equation are obtained. | Chuanqiang CHEN Xinan MA Shujun SHI | 2014 | Chinese Annals of Mathematics,Series B2014，35，6： | 4 |
| 2 | The Neumann Problem of Complex Special Lagrangian Equations with Supercritical Phase显示文摘nspired by the Neumann problem of real special Lagrangian equations with supercritical phase,we consider the Neumann problem of complex special Lagrangian equations with supercritical phase in this paper,and establish the global C^2 estimates and the existence theorem by the method of continuity. | Chuanqiang Chen Xinan Ma Wei Wei | 2019 | Analysis in Theory and Applications2019，35，2： | 2 |
| 3 | Quartz crystal microbalance study of the kinetics of surface initiated polymerization显示文摘Surface initiated polymerization (SIP) is a valuable tool in synthesizing functional polymer brushes,yet the kinetic understanding of SIP lags behind the development of its application. We apply quartz crystal microbalance (QCM) to address two issues that are not fully addressed yet play a central role in the rational design of functional polymer brushes,namely quantitative determination of the kinetics and the initiator efficiency (IE) of SIP. SIP are monitored online using QCM. Two quantitative frequencythickness (f-T) relations make the direct determination and comparison of the rate of polymerization possible even for different monomers. Based on the bi-termination model,the kinetics of SIP is simply described by two variables,which are related to two polymerization constants,namely a = 1/(kp,s,app-[M][R·]0) and b = kt,s,app/(kp,s,app[M]). Factors that could alter the kinetics of SIP are studied,including (i) the molecular weight of monomers,(ii) the solvent used,(iii) the initial density of the initiator,(iv) the concentration of monomer,[M],and (v) the catalyst system (ratio among the ingredients,metal,ligands,and additives). The dynamic nature of IE is also described by these two variables,IE = a/(a + bt). Instead of the molecular weight and the polydispersity,we suggest that film thickness,the two kinetic parameters (a and b),and the initial density of the initiator and IE be the parameters that characterize ultrathin polymer brushes. Besides the kinetics study of SIP,the reported method has many other applications,for example,in the fast screening of catalyst system for SIP and other polymerization systems. | CHEN XinAn ZHANG YaoZhong HE JianAn XIONG ChunYang MENG YongHong JIN Gang MA HongWei | 2009 | Science China Chemistry2009，52，12： | 2 |
| 4 | Puerarin protects Alzheimer’s disease neuronal cybrids from oxidant-stress induced apoptosis by inhibiting pro-death signaling pathways显示文摘 | Haiying Zhang Yiheng Liu Meili Lao Zhijian Ma Xinan Yi | 2010 | Experimental Gerontology2010，，： | 1 |
| 5 | The convexity estimates for the solutions of two elliptic equations 显示文摘 | Ma Xinan Shi Shujun Ye Yu | 2011 | Communtications in Partial Differential Equations2011，37，： | 1 |
| 6 | Partner selection of materials supply organization in large scale project construction显示文摘 | WANG Hongwei MA Xinan FEI Qi | 2001 | Computer Integrated Manufacturing Systems-CIMS2001，7，7： | 1 |
| 7 | Christoffel-Minkowski problem I: convexity of solutions of a hessian equation显示文摘 | Xinan Ma | 2003 | Invet Math2003，151，： | 1 |
| 8 | Nonparametric Mean Curvature Flow with Nearly Vertical Contact Angle Condition显示文摘For any bounded strictly convex domainΩin Rn with smooth boundary,we find the prescribed contact angle which is nearly perpendicular such that nonparametric mean curvature flow with contact angle boundary condition converge to ones which move by translation.Subsequently,the existence and uniqueness of smooth solutions to the capillary problem without gravity on strictly convex domain are also discussed. | Zhenghuan Gao Xinan Ma Peihe Wang Liangjun Weng | 2021 | Journal of Mathematical Study2021，54，1： | 0 |
| 9 | Study on the Host-Guest Interactions Between Tetramethyl Cucurbit[6]uril and Benzimidazole Derivatives显示文摘In this paper,^(1)H NMR spectroscopy,isothermal titration calorimetry,X-ray crystallography and other characterization methods were used to investigate the interaction modes of tetramethyl cucurbit[6]uril(TMeQ[6])and three benzimidazole derivatives in an aqueous solution-solid state.The results showed that the aromatic ring moieties in the three derivatives all entered the cavity of TMeQ[6]and their substituents were located at the port of TMeQ[6],forming 1:1 host-guest inclusion complexes.The crystal structures showed that the aromatic part of the benzimidazole derivatives interacted with the cavity of TMeQ[6]via hydrogen bond interactions and the N atoms on the benzimidazole ring formed hydrogen bonds with the carbonyl oxygen of TMeQ[6].The ion-dipole interactions between[ZnCl_(4)]^(2-)and TMeQ[6]formed supramolecular self-assembly entities. | YANG Naqin DAI Xue MA Yue YANG Xinan MA Peihua | 2023 | Chemical Research in Chinese Universities2023，39，6： | 0 |
| 10 | Albumin-bound kynurenic acid is an appropriate endogenous biomarker for assessment of the renal tubular OATs-MRP4 channel显示文摘Renal tubular secretion mediated by organic anion transporters(OATs)and the multidrug resistanceassociated protein 4(MRP4)is an important means of drug and toxin excretion.Unfortunately,there are no biomarkers to evaluate their function.The aim of this study was to identify and characterize an endogenous biomarker of the renal tubular OATs-MRP4 channel.Twenty-six uremic toxins were selected as candidate compounds,of which kynurenic acid was identified as a potential biomarker by assessing the protein-binding ratio and the uptake in OAT1-,OAT3-,and MRP4-overexpressing cell lines.OAT1/3 and MRP4 mediated the transcellular vectorial transport of kynurenic acid in vitro.Serum kynurenic acid concentration was dramatically increased in rats treated with a rat OAT1/3(rOAT1/3)inhibitor and in rOAT1/3 double knockout(rOAT1/3^(-/-))rats,and the renal concentrations were markedly elevated by the rat MRP4(rMRP4)inhibitor.Kynurenic acid was not filtered at the glomerulus(99%of albumin binding),and was specifically secreted in renal tubules through the OAT1/3-MRP4 channel with an appropriate affinity(Km)(496.7 mM and 382.2 mM for OAT1 and OAT3,respectively)and renal clearance half-life(t1/2)in vivo(3.7±0.7 h).There is a strong correlation in area under the plasma drug concentration-time curve(AUC0et)between cefmetazole and kynurenic acid,but not with creatinine,after inhibition of rOATs.In addition,the phase of increased kynurenic acid level is earlier than that of creatinine in acute kidney injury process.These results suggest that albumin-bound kynurenic acid is an appropriate endogenous biomarker for adjusting the dosage of drugs secreted by this channel or predicting kidney injury. | Yanrong Ma Fenglin Ran Mingyan Xin Xueyan Gou Xinyi Wang Xinan Wu | 2023 | Journal of Pharmaceutical Analysis2023，13，10： | 0 |
| 11 | Host-Guest Interactions of Cyclopentanocucurbit[6]uril with Alkyl Imidazolium Hydrochlorides显示文摘The host-guest interactions between cyclopentanocucurbit-[6]uril(CyP_(6)Q[6])as host and six alkyl imidazolium hydrochloride as guests(g1,g2,g3,g4,g5,and g6)have been studied by various techniques,such as^(1)H NMR spectroscopy,isothermal titration calorimetry,mass spectrometry,and single-crystal X-ray diffraction analysis.The experimental results showed that CyP6Q[6]formed 1:1 inclusion complexes with each of guests g1-g6.The part of the guest entered the cavity of CyP_(6)Q[6]changes as the alkyl chain increases in length.It can be seen that the length of the alkyl chain plays a key role in determining the mode of host-guest interactions. | GAO Jie MENG Ye ZHAO Weiwei JIANG Daofa ZHENG Jun YANG Xinan MA Peihua | 2021 | Chemical Research in Chinese Universities2021，37，3： | 0 |
| 12 | FIVE LIMIT CYCLES TO A CLASS OF SYSTEMS IN R^3显示文摘In this paper, a bridge between near-homogeneous and homogeneous vector fields in R 3 is found. By the relationship between homogeneous vector fields and the induced tangent vector fields of two-dimensional manifold S 2 , we prove the existence of at least 5 isolated closed orbits for a class of n + 1 (n ≥ 2) systems in R 3 , which are located on the five invariant closed cones of the system. | Lianhua Ma, Cuihong Yang , Xinan Zhang (School of Math. and Statistics, Central China Normal University, Wuhan 430079) | 2011 | Annals of Differential Equations2011，27，2： | 0 |
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