检索结果-南通市图书馆

Synthesis and Crystal Structure of a Spiral-chain Manganese(Ⅲ) Complex Containing Azide Bridge,[Mn(bzan)N_3]_n

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2002年第4期21卷 352-354页

作者： FENG Yun-Long (Institute of Physical Chemistry, Zhejiang Normal University, jinhua 321004, china) Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004

The title complex, C22H22MnN5O2, crystallizes in orthorhombic system, space group P212121 with a = 6.887(1), b = 11.718(2), c = 25.721(5) ? V = 2075.7(7) 3, Z = 4, Mr = 443.39, F(000) = 920, Dc = 1.419 g/cm3 and m = 0.665mm-1 (MoKa). The structure was refined to R = 0.0593 and wR = 0.1427 for 3576 observed reflections with I ≥ 2s(I). The Mn(Ⅲ) atom is coordinated to one bzan2- [bzan2- = N, N-ethylenebis(benzoylacetoneiminato)] ligand binding in the equatorial mode and two N3- ions in the axial positions. The azide acts as a trans--(1, 3) bridge, resulting in an infinite helical chain propagating along the b axis.

关键词： benzoylacetone Schiff base manganese complex crystal structure

Generalized dromions of the (2+1)-dimensional nonlinear Schrdinger equations

在线全文

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 2001年第1期6卷 50-53页

作者： Jiefang ZHANG (Institute of Nonlinear Physics, Zhejiang Normal University, jinhua 321004, china) Institute of Nonlinear Physics Zhejiang Normal University Jinhua 321004 China

We derive the generalized dromions of the (2+1)-dimensional nonlinear Schrodinger equations besides the basic dromion solutions by suitably utilizing the arbitrary function in the bilinearized equations. The rich drom... 详细信息

关键词： dromion (2+1)-dimensional nonlinear Schrdinger equations

Effect of lead on survival, locomotion and sperm morphology of Asian earthworm, Pheretima guillelmi

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第5期21卷 691-695页

作者： ZHENG Rongquan, LI Canyang College of Chemistry and Life Science, Zhejiang Normal University, jinhua 321004, china. College of Chemistry and Life Science Zhejiang Normal University Jinhua 321004 China

To provide basic toxicity data for formulating risk characterization benchmarks, the effects of lead on survival, locomotion, and sperm morphology were investigated in the Asian earthworm Pheretima guillelmi. The LC50 of P. guiUelmi for 7 and 14 d were 4285＋339 mg/kg and 3207＋248 mg/kg, which shows P. guillelmi can tolerate a higher concentration of lead nitrate. The average weight of the surviving earthworms decreased at concentration of 2800 mg Pb/kg soil, and the locomotor ability of earthworms exposed to a range of soil Pb concentrations showed a general decrease with increasing Pb concentrations. We also presented data depicting the sperm morphology of earthworms, which shows potential as a sensitive biomarker for measuring the effects of heavy metal on reproduction.

关键词： lead Pheretima guillelmi sperm morphology locomotion

A lower bound on the total signed domination numbers of graphs

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2007年第8期50卷 1157-1162页

作者： Xin-zhong LU Department of Mathematics,Zhejiang Normal University,jinhua 321004,china Department of Mathematics Zhejiang Normal University Jinhua China

Let G be a finite connected simple graph with a vertex set V（G）and an edge set E（G）. A total signed domination function of G is a function f:V（G）∪E（G）→{-1,1}.The weight of f is W（f）=∑x∈V（G）∪E（G）)f（X）.For an element x∈V（G）∪E（G）,we define f[x]=∑y∈NT[x]f（y）.A total signed domination function of G is a function f:V（G）∪E（G）→{-1,1} such that f[x]≥1 for all x∈V（G）∪E（G）.The total signed domination numberγs*（G）of G is the minimum weight of a total signed domination function on G. In this paper,we obtain some lower bounds for the total signed domination number of a graph G and compute the exact values ofγs*（G）when G is Cn and Pn.

关键词： total signed domination function total signed domination number

Arginine bi-directional translocation and breakdown into ornithine along the arbuscular mycorrhizal mycelium

在线全文

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2009年第4期52卷 381-389页

作者： JIN HaiRu College of Chemistry and Life Sciences, Zhejiang Normal University, jinhua 321004, china College of Chemistry and Life Sciences Zhejiang Normal University Jinhua China

Bi-directional translocation and degradation of Arginine (Arg) along the arbuscular mycorrhizal (AM) fungal mycelium were testified through 15N and/or 13C isotopic labeling. In vitro mycorrhizas of Glomus intraradices and Ri T-DNA-transformed carrot roots were grown in dual compartment Petri dishes. [15N- and/or13C]Arg was supplied to either the fungal compartment or the mycorrhizal compartment or separate dishes containing the uncolonized roots. The levels and labeling of free amino acids (AAs) in the mycorrhizal roots and in the extraradical mycelia(ERM) were measured by gas chromatogra- phy/mass spectrometry (GC-MS) and high-performance liquid chromatography (HPLC). The ERM of AM fungi exposed in either NH4+ or urea as sole external nitrogen source had much higher 15N enrichment of Arg, compared with those in nitrate or exogenous Arg; however, glycerol supplied as an external car- bon source to the ERM had no significant effect on the level of Arg in the ERM. Meanwhile, Arg bio- synthesized in the ERM could be translocated intact to the mycorrhizal roots and thereby the level of Arg in the mycorrhizal roots increased to about 20% after culture of ERM in 4 mmol/L NH4+ for 6 weeks. Also Arg was found to be bi-directionally transported along the AM fungal mycelium through [U-13C]Arg labeling either in the mycorrhizal compartment or in the fungal compartment. Once Arg was translo- cated to the potential N-limited sites, it would be further degraded into ornithine (Orn) and urea since either [U-13C] or [U-15N/U-13C]Orn was apparently shown up in the mycorrhizal root tissues when [U-13C] or [U-15N/U-13C]Arg was labeled in the fungal compartment, respectively. Evidently Orn formation indi- cated the ongoing activities of Arg translocation and degradation through the urea cycle in AM fungal mycelium.

关键词： arbuscular mycorrhiza arginine in vitro culture 15N labeling ornithine urea cycle

Strong uniqueness of best approximations in spaces of bounded linear operators

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2004年第3期47卷 339-351页

作者： LI Chong HE Jinsu Department of Mathematics, Zhejiang University Hangzhou 310027, china Department of Mathematics, Zhejiang Normal University jinhua 321004, china Department of Mathematics Zhejiang University Hangzhou China Department of Mathematics Zhejiang Normal University Jinhua China

The present paper is concerned with problems of the strong uniqueness of the best approximation and the characterization of a uniqueness element in operator *** results on the strong uniqueness of the best approximation operatorfrom RS-sets are proved and the uniqueness element of a sun in the compactoperator space from c0 to c0 is characterized by the strict Kolmogorov's *** recent results due to Lewicki and others are extended and improved.

关键词： best approximation operator, RS-set, sun, strong uniqueness, uniqueness element.

Perturbative Painleve Analysis of General KdV System and Its Exact Soliton Solutions

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第8期44卷 197-202页

作者： LIN Ji YE Li-Jun LI Hua-Mei Institute of Nonlinear Physics, Zhejiang Normal University, jinhua 321004, china Institute of Nonlinear Physics Zhejiang Normal University Jinhua 321004 China

Using the standard Painlevé analysis ad the perturbative method,the Painlevé test for the logarithmicbranch is investigated. Nine arbitrary functions are obtained and the B cklund transformation of the logarithmic b... 详细信息

关键词： Painlevé analysis perturbative method Jacobi elliptic solution

Synthesis and Structure of Bis(indene-1,2,3-trione 2-oximato)bis(aqua)Mn(Ⅱ): Mn(C_9H_4NO_3)_2(H_2O)_2

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2003年第2期22卷 133-136页

作者： FENG Yun-Long① (Institute of Physical Chemistry, Zhejiang Normal University, jinhua 321004, china Department of Chemistry, Zhejiang Normal University, jinhua 321004, china) Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004

The title complex, bis(indene-1,2,3-trione 2-oximato)bis(aqua)Mn(Ⅱ), crystallizes in the monoclinic system, space group P21/c with a = 5.201(1), b = 16.547(3), c = 9.914(2) ? ?= 100.30(3), V = 839.4(3) 3, Dc = 1.738 g/cm3, F(000) = 446, C18H12N2O8Mn, Mr = 439.24, m(MoKa) = 0.842 mm-1, Z = 2, the final R = 0.0228 and wR = 0.0782 for 1762 observed reflections (I ≥ 2s(I)). The geometry around Mn(Ⅱ) is a distorted octahedral configuration with the basal plane consisting of two oximo-oxygen and two carbonyl-oxygen atoms from ligand indene-1,2,3-trione 2-oximato, while the axial coordination sites are occupied by two water- oxygen atoms. A plane network is formed by the intermolecular hydrogen bonds. The title complex is the first example of metal complex containing ligand indene-1,2,3-trione 2-oxime.

关键词：锰(Ⅱ) 配合物合成晶体结构酮肟茚-1,2,3-三酮2-肟

ON THE TOPOLOGY,VOLUME,DIAMETER AND GAUSS MAP IMAGE OF SUBMANIFOLDS IN A SPHERE

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2004年第2期25卷 207-212页

作者： WUBINGYE DepartmentofMathematics ZhejiangNormalUniversityJinhua321004ZhejiangChina.

In this paper, the author uses Gauss map to study the topology, volume and diameter of submanifolds in a sphere. It is proved that if there exist ε, 1 ≥ε≥ 0 and a fixed unit simple p-vector a such that the Gauss map g of an n-dimensional complete to Sn, and the volume and diameter of M satisfy εnvol(Sn) ≤vol(M) ≤ vol(Sn)/εand επ≤diam(M) ≤π/ε, respectively. The author also characterizes the case where these inequalities become equalities. As an application, a differential sphere theorem for compact submanifolds in a sphere is obtained.

关键词：拓扑学高斯图直径子簇流形几何