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THE FUNCTION OF CAMP SIGNALING PATHWAY IN THE MATURATION OF HARD CLAM MERCENARIA MERCENARIA OOCYTES

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THE FUNCTION OF CAMP SIGNALING PATHWAY IN THE MATURATION OF ...

Low friction under ultrahigh contact pressure enabled by self-assembled fluorinated azobenzene layers

Ⅸ International Congress on Medical and Applied Malacology

作者： Tao Zhang~1 Qing Wang~(1 2) Hongsheng Yang~1 Fusui Zhang~1 1 Institute of Oceanology Chinese Academy of Sciences qingdao 266071 1 2 the Graduate School of Chinese Academy of Sciences Beijing 100049

＜正＞To identify the function of cAMP signaling pathway in the maturation of hard clam oocytes induced by 5-HT,oocytes of hard clam were treated with several modulators of transducers in *** showed that 0.01-100μM 5-HT can induce the maturation of hard clam oocytes remarkably,and the GVBD rate was about 70% after an hour induced by each

关键词： hard clam oocyte maturation cAMP signaling pathway GVBD 5-HT

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Friction 2024年第7期12卷 1434-1448页

作者： Dandan XUE Zhi XU Linyuan GUO Wendi LUO Liran MA Yu TIAN Ming MA qingdao ZENG Ke DENG Wenjing ZHANG Yichun XIA Shizhu WEN Jianbin LUO State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China National Center for Nanoscience and Technology Beijing 100190China

Extensive efforts have been made to pursue a low-friction state with promising applications in many fields,such as mechanical and biomedical *** which,the load capacity of the low-friction state has been considered to be crucial for industrial ***,we report a low friction under ultrahigh contact pressure by building a novel self-assembled fluorinated azobenzene layer on an atomically smooth highly-oriented pyrolytic graphite(HOPG)*** friction coefficients could be as low as 0.0005 or even lower under a contact pressure of up to 4 *** demonstrates that the low friction under ultrahigh contact pressure is attributed to molecular *** fluorination leads to effective and robust lubrication between the tip and the self-assembled layer and enhances tighter rigidity which can reduce the stress concentration in the substrate,which was verified by density functional theory(DFT)and molecular dynamics(MD)*** work provides a new approach to avoid the failure of ultralow friction coefficient under relatively high contact pressure,which has promising potential application value in the future.

关键词： ultrahigh contact pressure self-assembled layer fluorination robust lubrication

The Electrochemical Characteristics of Multilayer Assembly of Hemoglobin and Polystyrene Sulfonate at Self-assembled MonolayerSurface

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Chinese Chemical Letters 2000年第1期11卷 81-84页

作者： Hong SUN (Department of Chemistry, Textile College, qingdao University, qingdao 266071) Department of Chemistry Textile College Qingdao University Qingdao 266071 China

A multilayer film of hemoglobin (Hb) molecules and polyelectrolyte sulfonate were fabricated on a thiol self-assembled monolayers (SAMs) by electrostatic force. The Hb maintains electroactive property in the multilayer film, methylene blue (MB) incorporated into the multilayer can enhance the electron transfer rate between the Hb and the electrode surface.

关键词： multilayer film hemoglobin methylene blue

Study on the two and three-parameter working stability regions of 3Y-TZP suspension

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Science China(Technological Sciences) 2006年第5期49卷 547-568页

作者： CHEN Youqiang1, 2, ZHANG Xinni3, CHEN Sha’ou3 & QI Ping3 1. Department of Chemistry, qingdao University, qingdao 266071, China 2. Department of Chemistry, Tsinghua University, Beijing 100084, China 3. Department of Physics, qingdao University, qingdao 266071, China Department of Chemistry Qingdao University Qingdao China Department of Chemistry Tsinghua University Beijing China Department of Physics Qingdao University Qingdao China

We determined the variation tendency of viscosity (η) at various solids load- ing (α) for 3Y-TZP suspension as a function of dispersant concentration (Cw) using vis- cosity measurement, measured the diameter of particles as a function of Cw in very dilute suspension using light scattering method, and obtained the surface features of the sedi- ment of suspension with different Cw using SEM. We also discussed the influence of the microstructure of adsorbed polymer layers on particles and their interactions in the dis- persing medium on the stability of suspension. Then two different stable states and two different unstable states for 3Y-TZP suspension were given. Accordingly, the (Cw, η), (Cw, α), and (α, η) two-parameter, and (Cw, α, η) three-parameter stability maps were con- structed. Based on the DLVO theory calculations, the dispersant concentration, particle distance (r), and interparticle potential energy (VT) maps with various solids loading for 3Y-TZP aqueous suspension were also constructed. In (Cw, r) two-parameter coordinate system, the stable motion region map for particles was established. The Cw, α, and VT,max (the highest potential energy) surface of the potential barrier map was obtained through calculation and simulation on the basis of the surfaces of Cw, r, VT maps introduced above. The (Cw, α) two-parameter stability map was then obtained from the Cw, α, VT,max map. The results showed that this theoretical map can qualitatively prove the experimentally obtained results—the existence of different dispersed states of particles in suspension system and the variation tendency of suspension stability with changing each parame- ter—were reasonable.

关键词： 3Y-TZP, suspension, stability, DLVO theory, interparticle potential energy.

On the torsion in K_2 of a field

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Science China Mathematics 2008年第7期51卷 1187-1195页

作者： XU KeJian & LIU Min College of Mathematics,qingdao University,qingdao 266071,China College of Mathematics Qingdao University Qingdao China

For a field F,let Gn(F) = {{a,Φn(a)} ∈ K2(F) | a,Φn(a) ∈ F*},where Φn(x) is the n-th cyclotomic *** first,by using Faltings' theorem on Mordell conjecture it is proved that if F is a number field and if n = 4,8,12 is a positive integer having a square factor then Gn(F) is not a subgroup of K2(F),and then by using the results of Manin,Grauert,Samuel and Li on Mordell conjecture theorem for function fields,a similar result is established for function fields over an algebraically closed field.

关键词： number field function field torsion Milnor K2-group Mordell conjecture

Research on dual-stator winding multi-phase high-speed induction generator with rectifier load

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Science China(Technological Sciences) 2008年第6期51卷 683-692页

作者： WANG XiangHeng1 & WU XinZhen2 1 Department of Electrical Engineering, Tsinghua University, Beijing 100084, China 2 Department of Electrical Engineering, qingdao University, qingdao 266071, China Department of Electrical Engineering Tsinghua University Beijing China Department of Electrical Engineering Qingdao University Qingdao China

Based on analysis and calculation of the relation between current harmonics and MMF harmonics in the dual-stator winding multi-phase high-speed induction gen-erator with a rectifier load, a new idea, which divides the generator system into two sub-systems to be analyzed individually, is presented. For the sub-system of the 12-phase power winding with a rectifier load, the loop current method is used to establish network equation set in terms of the network graph theory. The numerical stability problem is solved by alternating use of fixed time-step and varied time-step, and the voltage and current with their fundamental components of the power winding are obtained. For the other sub-system of the induction generator with dual-stator winding and solid cage rotor, the electromagnetic field analysis method and the multi-variable optimization approach are combined to get the con-trol winding current and stator frequency. Calculated results well match experiment results, indicating that the new proposed method is of effectiveness and high ac-curacy.

关键词： dual-stator winding induction generator rectifier load MMF analysis loop current method finite element method optimization approach

The local classifications of the ruled surfaces of normals and binormals of a regular space curve

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Science China Mathematics 2007年第4期50卷 533-548页

作者： Jian-fei XIONG School of Mathematical Sciences, qingdao University, qingdao 266071, China School of Mathematical Sciences Qingdao University Qingdao China

The ruled surfaces of normals and binormals of a space curve is locally classified under the left-right action according to the types of the curve. In order to do this some useful results are obtained on the relations... 详细信息

关键词： local classification left-right equivalence orthogonal-right equivalence ruled surface normal and binormal 53A04 58C27

On Browkin's conjecture about the elements of order five in K_2(Q)

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Science China Mathematics 2007年第1期50卷 116-120页

作者： Ke-jian XU Department of Mathematics, qingdao University, qingdao 266071, China Department of Mathematics Qingdao University Qingdao China

Based on the work of Lenstra, a succinct proof of Browkin’s conjecture about the elements of order five in K2(Q) is given.

关键词： K2 group cyclotomic polynomial lattice binary quartic form.

The extension of the first main theorem for π-blocks

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Science China Mathematics 2006年第5期49卷 620-625页

作者： HAI Jinke Department of Mathematics, qingdao University, qingdao 266071, China College of mathematics ,Shandong University, Jinan 250100, China Department of Mathematics Qingdao University Qingdao China College of mathematics Shandong University Jian China

Let π be a set of primes and G a π-separable group. Isaacs defines the Bπ characters, which can be viewed as the "π-modular" characters in G, such that the Bp′ characters form a set of canonical lifts for the p-modular characters. By using Isaacs' work, Slattery has developed some Brauer's ideals of p-blocks to the π-blocks of a finite π-separable group, generalizing Brauer's three main theorems to the π-blocks. In this paper, depending on Isaacs' and Slattery's work, we will extend the first main theorem for π-blocks.

关键词： π-block, π-separable group, π-regular classes, defect group.