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Search Results: 1 - 10 of 22592 matches for " Rong Zhen "
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Dirichlet problem related to a class of superprocesses
Liu Zhen,Wu Rong
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02883210
Abstract:
Fabrication of DNA micropatterns on the polycarbonate surface of compact discs
Wang Zhen,Li Rong-Xian
Nanoscale Research Letters , 2006,
Abstract: DNA micropatterns have been fabricated on the surface of Polycarbonate (PC) bases of compact discs, with the ultimate goal of using conventional CD technology for DNA analysis. To confirm the formation of -COOH groups on the PC surface upon UV/ozone treatment, contact angle titrations were carried out on the PC surfaces. The surface morphologies of PC surface were measured by Tapping-mode Atomic Force Microscopy (AFM). As the surface as “anchor” to attach the amine-modified ssDNA by covalent conjugates via amide bonds, the results of fluorescence spectroscopy showed that the fluorescein labeled complementary ssDNA can be used for detection the ssDNA immobilized on the patterned CD polycarbonate substrate.
Analysis of Leaf Volatiles of Crabapple (Malus sp.) Individuals in Different Aphids’ Resistance  [PDF]
Rong Wang, Xiang Shen, Chao Wang, Rui Ge, Zhen Zhang, Xiaojing Guo
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.521344
Abstract: The aim of this experiment was to analyze the leaf volatiles of crabapple (Malus sp.) individuals at different aphid’s resistance, to ascertain the particular ingredients which has lure or aversion effects on aphid, and to provide reference for finding out a simple method to control effectively aphids. Volatiles of leaves from twenty-one different crabapple individuals were evaluated with the method of head space-solid phase micro-extraction and gas chromatography-mass spectrometry (HS-SPME-GC-MS). Volatiles profiles of them were then compared. There are one hundred eighty-six kinds of volatiles were detected with varied contents found in different individuals. And all plants contain eight kinds of common components: 3-Hexen-1-ol, acetate, (Z)-, 4-Hexen-1-ol, (Z)-, n-Decanal, n-Tetradecane, .alpha.-Farnesene, Diethyl Phthalate, Oxime-, methoxy-phenyl- and Dibenzofuran-, wherein the relative content of higher have 3-Hexen-1-ol, acetate, (Z)- and 4-Hexen-1-ol, (Z)-. Specific volatile substances in high resistance plants contain 3-Hexenal, (Z)- and 2-Hexenal, (E)-. Leaf volatiles differ in twenty-one crabapple individuals. High resistance plants specific volatile substances contains 3-Hexenal, (Z)-, 2-Hexenal, (E)- and other small molecular volatile substances, and no-resistance plants all have .beta.-Farnesene.
Nitridation of chromium powder in ammonia atmosphere
Ling Li,Qiang Zhen,Rong Li
- , 2015, DOI: https://doi.org/10.1007/s12613-015-1076-0
Abstract: CrN powder was synthesized by nitriding Cr metal in ammonia gas flow, and its chemical reaction mechanism and nitridation process were studied. Through thermodynamic calculations, the Cr-N-O predominance diagrams were constructed for different temperatures. Chromium nitride formed at 7002-1200°C under relatively higher nitrogen and lower oxygen partial pressures. Phases in the products were then investigated using X-ray diffraction (XRD), and the Cr2N content varied with reaction temperature and holding time. The results indicate that the Cr metal powder nitridation process can be explained by a diffusion model. Further, Cr2N formed as an intermediate product because of an incomplete reaction, which was observed by high-resolution transmission electron microscopy (HRTEM). After nitriding at 1000°C for 20 h, CrN powder with an average grain size of 63 nm was obtained, and the obtained sample was analyzed by using a scanning electron microscope (SEM).
Role of endometrial blood flow assessment with color Doppler energy in predicting pregnancy outcome of IVF-ET cycles
Lina Wang, Jie Qiao, Rong Li, Xiumei Zhen, Zhaohui Liu
Reproductive Biology and Endocrinology , 2010, DOI: 10.1186/1477-7827-8-122
Abstract: In the menstrual cycle, the endometrium has no adhesive qualities until the implantation window phase, during which for a very short time, the endometrium allows the implantation of gestational sacs. This feature is referred to as endometrial receptivity [1]. Endometrial receptivity has, for a long time, been the major focus in the field of assisted reproduction because the synchronous changes of the endometrium with embryonic development is the basis for embryonic implantation.Past studies related to endometrial receptivity were mainly focused on histopathological investigation of the endometrium, presented as endometrial dating by Noyes dating [2], or investigation of the receptors for estrogen, progesterone and other known factors related to endometrial receptivity. However, the diagnostic methods used for the above studies were invasive, hysteretic and a waste of time, and entailed intrauterine biopsy were not accepted by patients, because they were worried about subsequent miscarriage, and thus lost their value in guiding the assessment of endometrial receptivity, in those who wanted to be pregnant in this cycle.With the advance of diagnostic ultrasonography, clinical use of ultrasonic technology has increased as a way to track changes in the uterine wall thickness, in the assessment of the developmental potential of the basal layer of the endometrium. With the increased resolving power and sensitivity of ultrasonography, more studies were conducted on the use of endometrial blood flow in predicting endometrial receptivity. To date, the advantages of ultrasonography including its non-invasiveness, repeatability, real-time monitoring and predictability, have gained more medical attention; however, ultrasonographic findings indicating changed endometrial receptivity have not yet been acknowledged. Therefore, in this prospective study, we aim to examine the value of ultrasongraphic technology in the assessment of endometrial and subendometrial blood flow and clari
Efficient nano iron particle-labeling and noninvasive MR imaging of mouse bone marrow-derived endothelial progenitor cells
Rong Chen, Hui Yu, Zhen-Yu Jia, et al
International Journal of Nanomedicine , 2011, DOI: http://dx.doi.org/10.2147/IJN.S16934
Abstract: ient nano iron particle-labeling and noninvasive MR imaging of mouse bone marrow-derived endothelial progenitor cells Original Research (6107) Total Article Views Authors: Rong Chen, Hui Yu, Zhen-Yu Jia, et al Published Date March 2011 Volume 2011:6 Pages 511 - 519 DOI: http://dx.doi.org/10.2147/IJN.S16934 Rong Chen*, Hui Yu*, Zhen-Yu Jia, Qun-Li Yao, Gao-Jun Teng Jiangsu Key Laboratory of Molecular Imaging and Functional Imaging, Department of Radiology, Zhongda Hospital, Medical School of Southeast University, Nanjing, People’s Republic of China *These authors have contributed equally to this work Abstract: In this study, we sought to label mouse bone marrow-derived endothelial progenitor cells (EPCs) with Resovist in vitro and to image them using 7.0 Tesla (T) magnetic resonance imaging (MRI). Mouse bone marrow-derived EPCs were cultured in endothelial basal medium with endothelial growth supplement. They were then characterized by immunocytochemistry, flow cytometry, and fluorescence quantitative polymerase chain reaction. Their functions were evaluated by measuring their uptake of 1,1-dioctadecyl-3,3,3,3-tetramethylindocarbocyanine-labeled acetylated low-density lipoprotein (Dil-Ac-LDL), binding of fluorine isothiocyanate (FITC)-labeled Ulex europaeus agglutinin (UEA), and formation of capillary-like networks. EPCs were labeled with superparamagnetic iron oxide (SPIO) and their proliferation was then assessed in a water-soluble tetrazolium (WST-8)-based cell proliferation assay. Spin echo sequence (multislice, multiecho [MSME]) and gradient echo sequence (2D-FLASH) were used to detect differences in the numbers of labeled cells by 7.0 T MRI. The results showed that the cultured cells were of “cobblestone”-like shape and positive for CD133, CD34, CD31, von Willebrand factor, kinase domain receptor, and CD45, but negative for F4/80. They could take up Dil-Ac-LDL, bind FITC-UEA, and form capillary-like networks on Matrigel in vitro. Prussian-blue staining demonstrated that the cells were efficiently labeled with SPIO. The single-cell T2* effect was more obvious in the 2D-FLASH sequence than in the MSME sequence. Further, there were almost no adverse effects on cell vitality and proliferation. In conclusion, mouse bone marrow-derived EPCs can be efficiently labeled with SPIO and imaged with 7.0-T MRI. They may thus be traced by MRI following transplantation for blood vessel disorders and cancer treatment.
Regularity of Subelliptic Q Harmonic Maps into Homogeneous Manifolds
靶流形为齐次流形的弱次椭圆Q调和映射的正则性

ZHOU Zhen-Rong,
周振荣

数学物理学报(A辑) , 2005,
Abstract: In this paper, the author proves that weak subelliptic Q-harmonic maps into manifolds with symmetry are regular where Q is the homogeneous dimension of the domain. This generalizes the Hajlasz and Strzelecki's results of . As a consequence, the author obtains the regularity of p-harmonic maps from p dimensional manifolds into homogeneous spaces, which is proved by T.Toro and C.Wang in .
The effect of configuration complex on dielectronic recombination process in highly ionized plasmas

Jiao Rong-Zhen,Feng Chen-Xu,

中国物理 B , 2008,
Abstract: This paper analyses the effect of configuration complex on dielectronic recombination (DR) process in highly ionized plasmas (Xe26+, Dy38+, W46+) by using the multiconfiguration relativistic Hartree--Fock method. Resonant and nonresonant radiative stabilizing transitions and decays to autoionizing levels followed by radiative cascades are included. Collisional transitions following electron capture are neglected. The remarkable difference between the isoelectronic trend of the rate coefficients for DR through 3d9414l' and through 3d94l 5l' is emphasized. The trend of DR through 3d94l4l' shows irregularities at relatively low temperature due to the progressive closing of DR channels as atomic number Z increases.
Highly selective population of two excited states [2mm]in nonresonant two-photon absorption

Zhang Hui,Zhang Shi-An,Sun Zhen-Rong,

中国物理 B , 2011,
Abstract: A nonresonant two-photon absorption process can be manipulated by tailoring the ultra-short laser pulse. In this paper, we theoretically demonstrate a highly selective population of two excited states in the nonresonant two-photon absorption process by rationally designing a spectral phase distribution. Our results show that one excited state is maximally populated while the other state population is widely tunable from zero to the maximum value. We believe that the theoretical results may play an important role in the selective population of a more complex nonlinear process comprising nonresonant two-photon absorption, such as resonance-mediated (2+1)-three-photon absorption and (2+1)-resonant multiphoton ionization.
A dinuclear zinc complex with (E)-4-dimethylamino-N′-(2-hydroxybenzylidene)benzohydrazide
Jie Ma,Wei-Zhen Fan,Li-Rong Lin
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811014462
Abstract: The title compound, bis[μ-(E)-2-({2-[4-(dimethylamino)benzoyl]hydrazinylidene}methyl)phenolato]bis[formatozinc], [Zn2(C16H16N3O2)2(CHO2)2], is a dinuclear ZnII complex containing two ZnII cations, two monovalent anions of a Schiff base ligand, 4-dimethylamino-N′-(2-hydroxybenzylidene)benzohydrazide (L), and two formate ions. Each ZnII atom chelates with the hydroxy O atom of salicylaldehyde, the imine N atom, the carbonyl O atom, the formate carboxylate O atom and the hydroxy O atom of the salicylaldehyde moiety in a symmetry-related unit. The five-coordinate ZnII atoms form a dimeric centrosymmetric unit with a central parallelepiped Zn2O2 core and parallel faces derived from the Schiff base ligands. The crystal packing is stabilized by intermolecular N—H...O hydrogen bonds between the amide N atom and the formate carboxylate O atom.
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