Toxic Plant Resources in Panxi Area

Panxi Area is abundant in plant resources, among which toxic plants are of great value in terms of exploitation. This paper is an initiative study （via field as well as literature investigation） of the categories, distributions, and reserves of toxic plant resources in Panxi Area. The study reveals that there are 51 families （210 species） of toxic plants evenly distributed in Panxi Area, of which more than 40 species grow in all counties in the area, and more than 14 species total a reserve more than 1.0×10^5 kg. These toxic plants are of great applications to medicine, gardening, biopesticide industry, environmental engineering, and oil manufacturing. Rhododendron molle, Anisodus acutangulus, Arisaema erubesocens, Stellera chamaejasme, Rhytolacca acinosa, Rheum officinale, and Azadiralta indica etc are the typical toxic plants with great value of exploitation in Panxi Area.     

图的Seidel Laplacian-Estrada指标

设G为简单图,d_i表示顶点v_i的度,G的Seidel Laplacian矩阵S_L(G)是一个对角元为n-1-2d_i,非对角元为±1的实对称矩阵,当顶点v_i和v_j相邻时,(S_L(G))_(ij)=1,否则,(S_L(G))_(ij)=-1。引入并研究了Seidel Laplacian矩阵的Estrada指标,给出了该指标的上、下界,以及它与Seidel Laplacian能量之间的关系。     

Preparation of Ln3-xEuxS4 （Ln=Ce,Pr, and Nd） ceramics by pressureless sintering

The preparation of ternary rare earth sulfides of Ln3-xEuxS4 （Ln = Ce, Pr, and Nd） ceramics was investigated, and the effect of Eu substitution on Ln3-xEuxS4 ceramics was also studied. Ln3-xEuxS4 powders were synthesized by the sulfurization of their oxide powders using carbon disulfide gas. Ln3-xEuxS4 ceramics were sintered by pressure-less sintering method. All pressureless sintered Ln3-xEuxS4 ceramics crystallized in y-phase. It was found that Eu substitution could improve the density of Ln3-xEuxS4 ceramics. Furthermore, Eu substitution might narrow the optical band gaps of Ln3-xEuxS4 ceramics.     

Studies on reduced extent method for inhibited thermokinetics of enzyme-catalyzed reaction

The thermokinetic reduced extent equations of reversible inhibitions for Michaiels-Menten enzymatic reaction were deduced, and then the criteria for distinguishing inhibition type was given and the methods for calculating kinetic parameters,K _M,K _i andv _m were suggested. This theory was applied to inverstigate the inhibited thermokinetics of laccase-catalyzed oxidation ofo-dihydroxybenzene bym-dihydroxybenzene. The experimental results show the inhibition belongs to reversible competitive type,K _M=6.224×10⁻³ mol·L⁻¹,K _i=2.363×10⁻² mol·L⁻¹. Xiong Ya: born Sep. 1961, Ph. D. graduate student. Curent research interest is in biothermochemistry research Supported by the National Natural Science Foundation of China     

A Large Deviation Principle for the Risk Process with Varying Premium

Let u ∈ R ,for any ω 〉 0, the processes X^ε = {X^ε（t）; 0 ≤ t≤ 1} are governed by the following random evolution equations dX^ε（t）= b（X^ε（t）,v（t））dt-εdSt/ε, where S={St; 0≤t≤1} is a compound Poisson process, the process v={v（t）; 0≤t≤1} is independent of S and takes values in R^m. We derive the large deviation principle for{（X^ε,v（.））; ε〉0} when ε↓0 by approximation method and contraction principle, which will be meaningful for us to find out the path property for the risk process of this type.     

碱土金属卤化物理化性质QSPR的研究

根据无机物成键原子的结构特征,提出用新的方法：δi^S=（mizi＋ziEi）/2ninj来计算无机分子中原子特征值δi^S,构建新的拓扑指数^mS.用^0S、^1S作为分子结构特征描述符,通过Statistica5.0软件进行多元线性回归,按照标准偏差取最小,相关系数取最大的原则,建立碱土金属卤化物的物理化学性质Pi与分子结构描述符（^0S、^1S）之间的定量相关方程,并对相关关系进行显著性检验.结果表明,新的拓扑指数对分子结构选择区分性高,具有比较高的相关性和精度,并且计算简便,物理意义明确,建立的各种方程得出的各种物理化学性质预测值与实验值之间能很好地吻合,比其他文献方法更具有广泛性.     

The Total Irredundance Numbers on Graphs

This paper discusses the total irredundance relations between the graph G and its clone-contraction graph H, that is, let H be the clone-contraction graph of G and v1,v2,...,vk be all contraction vertices ofH. IfS is a maximal total irredundant set of H such that A = S ∩ {V1,V2,…,Vk} contains as few vertices as possible, then S＇= S-A is the maximal total irredundant set of G. Furthermore, we obtain the bound of the total irredundance A（G） number： irt ≤△（G）/2△（G）＋1 n, which n is the order of graph G, and △（G） is maximum degree in G.     

Fluorescence Determination of Artemisinin Using Hemoglobin as Catalyst and Pyronine B as Substrate

0 IntroductionMaalnadria siusb atr ompajicosr .he aAltrthe pmrisoibnlienmi (n qtihneghtraoopsiucs,QHS,Fig.1) is a sesquiterpene endoperoxide isola-ted fromArtemisia annuaL., an ancient Chineseherbal medicine usedfor treatment of fever and ma-laria.Studies of the structure and activity relation-ship have shownthat endoperoxide groupis essentialfor anti malarial activity of QHS and absence of thismoiety lead to completely loss in activity of thedrug. Many techniques have been developed to de…     

Significance of native arsenic in the Baogutu gold deposit, western Junggar, Xinjiang, NW China

Native arsenic together with comb quartz and stibnite is found in the Baogutu gold deposit, western Junggar (Xinjiang), NW China. It is anhedral with various grain size (<0.001 to 2 mm), and contains 98 wt% to 98.7 wt% As. Micro-granular electrum, the main auriferous mineral in the Baogutu gold deposit, is commonly enclosed in or closely accompanied by native arsenic. Three ore-forming paragenetic stages could be identified. Native arsenic mainly formed at stage II which is also the major stage for gold deposition. Mineral assemblage formed at this stage is native arsenic-stibnite-electrum-arseno- pyrite-miargyrite-freibergite-pyrrhotite-pyrite. Based on native arsenic and its coexisting minerals, the temperature (230 to 170℃), oxygen fugacity (logfO₂ = −42―−56.5) and sulfur fugacity (logf S₂ = −13.3― −16.6) of stage II are estimated. From stage I to stage II, the temperature, sulfur fugacity and S²⁻ con-centration of hydrothermal fluid decrease obviously, whereas the As concentration increases. Coexis-tence with native arsenic of electrum and its contents of 0.5 wt%―1.3 wt% As suggest that As is im-portant to transport Au when S²⁻ concentration decrease in hydrothermal fluid. Crystallization of native arsenic induced the deposition of electrum and consequently the formation of the Baogutu gold deposit.     

A theoretical study of the proton transfer process in the spin-forbidden reaction ^1HNO（^1A＇） ＋ OH^-→^ 3NO^-（^3∑^-） ＋ H2O

The spin-forbidden reaction 1HNO（^1A＋OH^-→3NO^-（^3∑^-）＋H2O has been extensively explored using vari- ous CASSCF active spaces with MP2 corrections in several basis sets. Natural bond orbital （NBO） analysis, together with the NBO energetic （deletion） analysis, indicates that the two isomers have nearly equal total energy and could compete with each other in the title reaction. More significantly, the singlet/triplet surface crossing regions have been examined and the spin-orbit coupling （SOC） and energetics have been computed. The computational results indicate that the SOC is very large at the crossing point T1/S0 trans （ca. 40.9 cm^-1）. Moreover, the T1/S0 trans has a low energy of 10.67 kcal/mol relative to that of trans-So. Therefore, the surface crossing to the triplet state seems much more efficient at the T1/S0 trans region along the minimum energy path （MEP）, However, The values of single （P1^ISC） and double （P2^ISC） passes estimated at T1/S0 trans show that the ISC occurs with a little probability.     

污水排海工程渔业资源损害定量分析

【目的】以曹妃甸某污水排海工程为例,对排海工程渔业资源损害定量分析方法进行探讨,为今后类似工程生物资源损害评估提供参考依据。【方法】在大量已有研究成果及经验的基础上,对水污染生物资源损害计算基本公式、受损范围及死亡率的确定方法进行讨论。结合工程实际情况及海洋生态环境现状调查结果,定量分析工程对渔业资源造成的损害。【结果】工程对海洋渔业资源造成损害的面积约为0.218km2,在此范围内,仔鱼和鱼卵的损失量分别约为4.65×106尾和9.63×106个,而成鱼基本不受影响。【结论】本方法的提出对今后海洋工程生物资源损害研究具有一定的参考价值。     

Mechanisms of peroxynitrite-induced [Ca2+]i increase in single neuronal cell

The mechanism of peroxynitrite (ONOO⁻)-induced [ca²⁺]_i increase in single MN9D cell (Dopaminergic neuroblastoma cell line) was studied by using Fura-2 microfluorometric technique. The results show that ONOO⁻ caused a rapid increase of [Ca²⁺]_i when ONOO₋ was puffed to the cell. Removing Ca²⁺ from the bath or using calcium channel antagonist (CdCl₂, Nifedipine) greatly inhibited the [Ca²⁺]_i increase induced by ONOO⁻¹, suggesting that the opening of L-Ca²⁺ channel makes a great contribution to the [Ca²⁺]_i increase. The effect of sulfhydryl reductive agent (DTT) on ONOO⁻-induced [Ca²⁺]_i increase suggests that ONOO⁻-activating L-Ca²⁺ channel is partly related to its oxidative speciality.     

Measurement of Magnetization Curve and Magnetic Relaxation for 2H-NbSe2 Crystals

The characteristics of electronic transport properties: behaviors of magnetization curve and magnetic relaxation of a typical normal superconductor 2H-NbSe2 are investigated. The results show that Tc and △Tc of the samples are 7. 2,0. 18 K, indicating that superconducting energy gap at zero temperature is 1. 1 meV. No fish tail shape is found in the magnetization curves at several temperatures. The relationship between remnant magnetic moment and time reveals that the magnetic flux creep of the sample agrees with the Kim-Anderson thermal activation model with the relaxation rate S=0.000 36 at T=6 K.     

2010年夏季广西北部湾沿岸浮游植物分布特征及其与环境因子的相关性

2010年6月4日至26日在广西北部湾沿岸共设46个站位凋查分析浮游植物群落结构特征,以及浮游植物数量与环境因子的相关性。结果共鉴定出浮游植物70属149种(含变种和变型),其中硅藻41属106种,占总物种数的71.14%,占总细胞丰度的95.81%;甲藻18属32种,占总物种数的21.48%,占总细胞丰度的1.44%。浮游植物平均密度为61.10×104 cell/L,硅藻平均细胞丰度为58.54×104 cell/L,甲藻类平均细胞丰度为0.88×104cell/L。浮游植物密集区在防城港海区,此外在北海营盘附近海域有一个较高的密度区。浮游植物丰度在茅尾海和钦州港近岸较低,其余海区的浮游植物数量分布态势为近岸高、外海低。浮游植物主要优势种为尖刺拟菱形藻(Pseudo-nitzschia pungens)、中肋骨条藻(Skeletonema costatum)、拟旋链角毛藻(Chaetocerospseudocurvisetus)、菱形海线藻(Thalassionema nitzschioides)、丹麦细柱藻(Leptocylindrus danicus)。尖刺拟菱形藻、拟旋链角毛藻密集区主要在防城港海区,而中肋骨条藻密集区主要在北海海区。浮游植物数量与温度、盐度及硝酸盐、亚硝酸盐、氨盐和硅酸盐无相关性,北海海区和防城港海区浮游植物丰度与活性磷酸盐呈显著正相关,磷在以上两个海区成为浮游植物生长的限制因子。     

An Improved Genetic Algorithm for Problem of Genome Rearrangement

In view of the fact that the problem of sorting unsigned permutation by reversal is NP-hard, while the problem of sorting signed permutation by reversal can be solved easily, in this paper, we first transform an unsigned permutation of length n,π （π1 ,… ,πn）, into a set S（π） containing 2^n signed permutations, so that the reversal distance of π is equal to the reversal distance of the optimal signed permutation in S（π）. Then analyze the structural features of S（π） by creating a directed graph and induce a new computing model of this question. Finally, an improved genetic algorithm for solving the new model is proposed. Experimental results show that the proposed model and algorithm is very efficient in practice.     

Quantum chemical studies on tuning the second-order nonlinear optical molecular switching of triarylborane derivatives

In this work, density functional theory (DFT) combined with the finite field (FF) method has been adopted to analyze the second-order nonlinear optical (NLO) properties of the triarylborane (TAB) derivatives obtained by introducing different inductive electron groups into the phenylene ring of the TAB (RTAB, where R=2-C6H5-C2B10H10(1),R=F(2), R=Me(3),R=NO2(4),R=NH2(5)). The static first hyperpolarizabilities (βtot) of the RTAB molecules can be switched by binding one F- to the boron center (RTAB′) or one-electron reduction (RTAB"). The DFT-FF calculations show that the βtot values of 2′, 3′ and 5′ decrease while those of 1′ and 4′ increase compared with the values of their neutral molecules, which was attributed to the fact that the charge transfers of 2, 3 and 5 become smaller and those of 1 and 4 become larger by binding one F- ion to the boron center, according to time-domain DFT (TD-DFT) analysis. However, the incorporation of one electron enhances the second-order NLO properties of the RTAB molecules remarkably, especially for system 1. It is notable that the βtot value of reduced form 1″ is 508.69×10-30 esu, i.e. about 578 times larger than that of system 1. Frontier molecular orbital (FMO) and natural bond orbital (NBO) analyses suggest that the reversal of the charge distribution between the neutral molecules and their reduced forms leads to low HOMO-LUMO energy gaps (E0) and thus large βtot values for the reduced forms.     

Julia sets of the random iteration systems and its subsystems

Suppose that P=(p\-1, p\-2, ..., p\-M)\% is a probability vector with p\-i>0 and Y={1, 2, ..., M}. Let (Y, 2\+Y, μ) be a probability space with μ(i)=p\-i, i=1, 2, ..., M, and (∑\-M, B, m)= Π \+∞\-0(Y, 2\+U, μ). It is shown that for any a \%(0≤a ≤1) \%, there exists a set U∈B such that m(U)=a and the Julia set associated with U is equal to the Julia set associated with ∑\-M\%. Moreover repelling fixed points with respect to U are dense in the Julia set associated with U.     

Synthesis and Characterization of Polyamide-Containing 2, 6- （Substituded） pyridine Derivatives

0 IntroductionPayrriodminaetiics hoenteer oofc ythcleics m .os tC oambupnoduanndts a cnodn tbaeisntin kgno twhnepyridine ring are widely distributedin nature,principally asenzymes and alkaloids . Pyridine enzymes have been foundintissues of all plants and ani mals examined thus far ,andare derivedfromeither nicotinic acid or Vitamin B6[1].Pyr-idine derivatives are also the building block of many phar-maceuticals with a wide range of functionalities that includeantitubercular compounds ,antivi…     

Preparation and kinetics of the thermal decomposition of nanosized CuC2O4−ZnC2O4·2H2O

The physical mixture of nanosized CuC₂O₄−ZnC₂O₄·2H₂O, as precursors of CuO−ZnO, have been prepared by the one-step solid state reaction method at room temperature. The thermal decomposition processes taking place in the solid state oxalate mixture of nanometer CuC₂O₄−ZnC₂O₄·2H₂O have been studied in static air using TG, DSC, XRD and TEM techniques. TEM showed that the grain size of the decomposition product is 5–15 nm. The values of the activation energyE _α were determined using the isoconversional procedure of KAS method and the Ozawa method. The most possible mechanism functionf(α) of the thermal decompositions of nanosized CuC₂O₄−ZnC₂O₄·2H₂O are defined using the comparative method, function models of the decomposition of CuC₂O₄ and ZnC₂O₄ follow the same mechanism function “Avrami-Erofeev equation”. The pre-exponential factorA is obtained on the basis ofE _α andf(α), thus the thermal analysis kinetic triplet of the decompositions of nanosized CuC₂O₄−ZnC₂O₄·2H₂O are determined. Foundation item: Supported by the key Natural Science Fund of Deparartment of Science and Technology of Hubei Province (2001ABA099). Biography: CHEN Donghua(1946-), male, Professor, research direction: material synthesize and thermal, analysis kinetics.     

Distribution characteristics of soil organic carbon of alpine meadow in the Eastern Qinghai-Tibet Plateau

A study on the distribution characteristics of soil organic carbon (SOC) in the alpine meadow in the Eastern Qinghai-Tibet Plateau has been carried out. The results indicate that the content of soil organic carbon (C _SOC) in the topsoil of terrace meadow (TM) ((67.16 ± 1.02) g·kg⁻¹) is more than that in the soil of upland meadow (UM) ((63.42 ± 0.65) g·kg⁻¹), while the C _SOC in upland shrubland (US) ((67.49 ± 0.83) g·kg⁻¹) is the most abundant in the scoreh stage (September). From May to September, the C _SOC in the topsoil of UM and US tends to descend, but that of TM tends to ascend. As for the distribution of the C _SOC and the density of SOC in the soil in the three sample areas, the data show that the deeper the soil, the lesser the content and density of SOC. The C _SOC in US is higher than that in TM and UM; the C _SOC in UM is the lowest at 0–10 cm soil depth. The density of SOC in US is always the lowest among UM, TM, and US at 0–40 cm depth, which shows that the storage of carbon in UM is more than that in US in the same range; the carbon pool capacity in UM is higher than that in US in the same range. Biography: ZHANG Wei (1979–), male, Lecturer, research direction: ecology of environment.