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Search Results: 1 - 10 of 72776 matches for " Hai-Yan Sun "
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Congruences for sequences analogous to Euler numbers
Zhi-Hong Sun,Hai-Yan Wang
Mathematics , 2013,
Abstract: For a given real number $a$ we define the sequence $\{E_{n,a}\}$ by $E_{0,a}=1$ and $E_{n,a}=-a\sum_{k=1}^{[n/2]} \binom n{2k}E_{n-2k,a}$ $(n\ge 1)$, where $[x]$ is the greatest integer not exceeding $x$. Since $E_{n,1}=E_n$ is the n-th Euler number, $E_{n,a}$ can be viewed as a natural generalization of Euler numbers. In this paper we deduce some identities and an inversion formula involving $\{E_{n,a}\}$, and establish congruences for $E_{2n,a}\mod{2^{{\rm ord}_2n+8}}$, $E_{2n,a}\pmod{3^{{\rm ord}_3n+5}}$ and $E_{2n,a}\pmod{5^{{\rm ord}_5n+4}}$ provided that $a$ is a nonzero integer, where ${\rm ord}_pn$ is the least nonnegative integer $\alpha$ such that $p^{\a}\mid n$ but $p^{\a+1}\nmid n$.
catena-Poly[[[2-(2-pyridyl)-1H-benzimidazole]cadmium(II)]-μ-benzene-1,4-dicarboxylato]
Hai-Yan Liu,Da-Wei Zhao,Hong-Mei Sun
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809026890
Abstract: In the title compound, [Cd(C8H4O4)(C12H9N3)]n, each CdII ion is six-coordinated in a distorted octahedral geometry by four carboxylate O atoms from two benzene-1,4-dicarboxylate anions (L), and two N atoms from one 2-(2-pyridyl)benzimidazole ligand. The neighboring CdII ions are bridged by the L ligands, forming a zigzag polymeric chain structure. The chains are further extended into a three-dimensional supramolecular structure through intermolecular N—H...O hydrogen bonds.
Bis[μ-1,2-bis(1H-imidazol-1-ylmethyl)benzene-κ2N3:N3′]disilver(I) 3-carboxylato-4-hydroxybenzenesulfonate methanol solvate trihydrate
Hong-Mei Sun,Yun-Chao Chi,Hai-Yan Liu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809030268
Abstract: In the title compound, [Ag2(C14H14N4)2](C7H4O6S)·CH3OH·3H2O, the complex dication has a binuclear structure in which each AgI ion is two-coordinated in a slightly distorted linear coordination geometry. The two AgI atoms are bridged by two 1,2-bis[(1H-imidazol-1-yl)methyl]benzene (IBI) ligands, forming a 22-membered ring. In the dication, π–π interactions are observed between the imidazole rings with centroid–centroid distances of 3.472 (3) and 3.636 (3) . In the crystal, the uncoordinated water molecules, anions and methanol solvent molecules are linked into chains along the b axis by O—H...O hydrogen bonds. In addition, π–π interactions are observed between the benzene rings of the IBI ligands, with a centroid–centroid distance of 3.776 (2) . The sulfonate group is disordered over two orientations with occupancies of 0.676 (12) and 0.324 (12).
Poly[bis(μ-azido-κ2N1:N1)[μ-1,2-bis(imidazol-1-yl)ethane-κ2N3:N3′]cadmium]
Hai-Yan Li,Peng-Peng Sun,Bao-Long Li
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812004370
Abstract: In the title three-dimensional coordination polymer, [Cd(N3)2(C8H10N4)]n, the coordination geometry around the CdII atom is distorted octahedral. The CdII atom is coordinated by two N atoms from two cis-positioned bridging 1,2-bis(imidazol-1-yl)ethane (bime) ligands and four N atoms from four azide anions. Each azide ligand acts in an end-on bridging coordination mode. The azide ligands and CdII atoms form a one-dimensional zigzag chain constructed from four-membered [Cd(N3)2]n metallacycles extending along the a axis. These inorganic chains are connected with four other chains via bridging bime ligands to form a three-dimensional coordination network.
Correlation between CT Perfusion Parameters and Microvessel Density and Vascular Endothelial Growth Factor in Adrenal Tumors
Hai-yan Qin, Haoran Sun, Xifu Wang, Renju Bai, Yajun Li, Jinkun Zhao
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0079911
Abstract: We evaluated the correlation between computed tomography (CT) perfusion parameters and markers of angiogenesis in adrenal adenomas and non-adenomas to determine if perfusion CT can be used to distinguish between them. Thirty-four patients with pathologically-confirmed adrenal tumors (17 adenomas, 17 non-adenomas) received CT perfusion imaging before surgery. CT perfusion parameters (blood flow [BF], blood volume [BV], mean transit time [MTT], and permeability surface area product [PS]) were calculated. Tumor tissue sections were examined with immunohistochemical methods for vascular endothelial growth factor (VEGF) expression and microvessel density (MVD). The mean age of the 34 patients was 43 years. The median BV was significantly higher in adenomas than in non-adenomas [12.3 ml/100 g, inter-quartile range (IQR): 10.4 to 16.5 ml/100 g vs. 8.8 ml/100 g, IQR: 3.3 to 9.4 ml/100 g, p = 0.001]. Differences in BF, MTT, and PS parameter values between adenomas and non-adenomas were not significant (p>0.05). The mean MVD was significantly higher in adenomas compared to non-adenomas (98.5±28.5 vs. 53.5±27.0, p<0.0001). Adenomas also expressed significantly higher median VEGF than non-adenomas (65%, IQR: 50 to 79% vs. 45%, IQR: 35 to 67%, p = 0.02). A moderately strong correlation between BF and VEGF (r = 0.53, p = 0.03) and between BV and MVD among adenomas (r = 0.57, p = 0.02) exist. Morphology, MVD, and VEGF expression in adenomas differ significantly from non-adenomas. Of the CT perfusion parameters examined, both BF and BV correlate with MVD, but only BF correlates with VEGF, and only in adenomas. The significant difference in BV suggests that BV may be used to differentiate adenomas from non-adenomas. However, the small difference in BV shows that it may only be possible to use BV to identify adenomas vs. non-adenomas at extreme BV values.
Inhibition of Longzhi extracts on tumor growth of transplanted H22 and S180 in mice
PENG Hai-Yan
Zhong Xi Yi Jie He Xue Bao , 2004,
Abstract: Objective: To study the inhibitory effect of Longzhi extracts (extracts from a Chinese herbal compound) on the growth of transplanted hepatoma H22 and sarcoma S180 in mice. Methods: Certain dosage of Longzhi extracts was dissolved into distilled water to obtain the suspension of definite concentration. The suspension of 0.2 ml was planted on the right forefoot of each mouse. The mice were randomly divided into groups 24 hours later and treated for 7 days. One day after the treatment stopped, the mice were sacrificed and the tumor masses were taken out and weighed. Results: The inhibition rates of Longzhi extracts on the tumor of transplanted H22 and S180 were 63% and 41% respectively. Conclusion: Longzhi extracts has antitumor action.
Bound 14 C-metsulfuron-methyl residue in soils
YE Qing-fu,DING Wei,WANG Hai-yan,HAN Ai-liang,SUN Jin-he,
YE Qing-fu
,DING Wei,WANG Hai-yan,HAN Ai-liang,SUN Jin-he

环境科学学报(英文版) , 2005,
Abstract: Bound residue(BR) of 14 C-metsulfuron-methyl ( 14 C-BR) in seven kinds of soil was significantly negative-related to soil pH and positive-related to the clay content during the initial 20 d of incubation, but only was significantly negative-related to soil pH after 30 d incubation. Again, the soil pH was found to be the dominant factor affecting BR formation from 14 C-metsulfuron-methyl among the basic properties(soil pH, clay, OM and CEC etc.) of soil. The maximum content of 14 C-BR in the 7 soils accounted for 19.3%-52.6% of applied amount. In addition, the composition of the 14 C-BR in fluvio marine yellow loamy(S 7) at the 90 d of incubation was identified using the coupling technique of LC-MS and isotope tracing method. The results showed that the 14 C-2-amino-4-hydroxyl-6-methyl-1, 3, 5]-triazine, 14 C-2-amino-4-methoxy-6-methyl-1, 3, 5]-triazine and 14 C-metsulfuron-methyl parent compound constituted the main components of the BR derived from 14 C-metsulfuron-methyl in the S 7. The relative percentage of the three compounds accounted for 41.4%, 35.8% and 19.3% of total recovery radioactivity, respectively. The results also indicated that a non-radioactive component, 2-methylformate-benzenesulfonyl-isocyanate, one of the degraded products of metsulfuron-methyl in soil, was also found to be one of the components of the BR. The parent compound in BR can well explain the phytotoxic effect on substitution crops caused by the BR derived from metsulfuron-methyl in soil.
Folding rate prediction using complex network analysis for proteins with two- and three-state folding kinetics  [PDF]
Hai-Yan Li, Ji-Hua Wang
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.28094
Abstract: It is a challenging task to investigate the different in- fluence of long-range and short-range interactions on two-state and three-state folding kinetics of protein. The networks of the 30 two-state proteins and 15 three-state proteins were constructed by complex networks analysis at three length scales: Protein Contact Networks, Long-range Interaction Networks and Short-range Interaction Networks. To uncover the relationship between structural properties and folding kinetics of the proteins, the correlations of protein network parameters with protein folding rate and topology parameters contact order were analyzed. The results show that Protein Contact Networks and Short-range Interaction Networks (for both two-state and three-state proteins) exhibit the “small-world” property and Long-range Interaction networks indicate “scale-free” behavior. Our results further indicate that all Protein Contact Networks and Short- range Interaction networks are assortative type. While some of Long-range Interaction Networks are of assortative type, the others are of disassortative type. For two-state proteins, the clustering coefficients of Short-range Interaction Networks show prominent correlation with folding rate and contact order. The assortativity coefficients of Short-range Interaction Networks also show remarkable correlation with folding rate and contact order. Similar correlations exist in Protein Contact Networks of three-state proteins. For two-state proteins, the correlation between contact order and folding rate is determined by the numbers of local contacts. Short- range interactions play a key role in determining the connecting trend among amino acids and they impact the folding rate of two-state proteins directly. For three-state proteins, the folding rate is determined by short-range and long-range interactions among residues together.
Nutrient and Poisonous Composition in the Mixed Silage of Maize and Astragalus adsurgens Pall. with Varied Proportions
Peng Feng,Qi-Zhong Sun,Hai-Yan Zheng,Sheng-Xing Ye,Zhu Yu,Jian-Guo Xue
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.1532.1537
Abstract: Keduo 8 silage maize mixed and ensiled with Astragalus adsurgens Pall. at the ratio of :0, 2:1, 1:1, 1:2 and 0:1, respectively, the nutrient compositions and content of poisonous substances in all treatments determined. The result showed that with increasing proportions of Astragalus adsurgens Pall., the pH value and crude protein content raised while the neutral detergent fibre and acid detergent fiber had a descending trend. Mixed silage could raise the amino acid content. Aflatoxin content of treated silages were higher than those of initial herbage, respectively while the zearalenone, nitrite, nitrate, 3-Nitropropionic acid content were lower. The nutrient and amino acid content of the mixed silage of 1/2 maize and 1/2 Astragalus adsurgens Pall. were relatively high and the contents of poisonous elements were reduced which was the ideal mixed silage treatment.
Toxicokinetics of T-2 Toxin, HT-2 Toxin and T-2 Triol after Intravenously Administrated T-2 Toxin in Swine
Yong-Xue Sun,Hai-Yan Zhao,Yu-Jing Liu,Zhen-Qing Dai,Bing-Hu Fang
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.1977.1981
Abstract: Toxicokinetics of trichothecene mycotoxin, T-2 toxin, HT-2 toxin and T-2 triol were determined in seven swine, after intravenous administration (i.v.) of T-2 toxin (0.5 mg kg-1). The T-2 toxin, HT-2 toxin and T-2 triol plasma concentrations were analyzed by HLPC-MS/MS from 2.5 min to 6 h. The mean pharmacokinetic parameters for T-2 toxin, HT-2 toxin and T-2 triol were respectively: half-life (t1/2λZ) 11.7, 37.7 and 25.6 min; areas under the plasma concentration-time curves (AUC0-00): 16499, 4619 and 11011 min ng mL-1. Following i.v administration, times to observed maximal concentration (Tmax) were 2.5, 2.5 and 7.5 min, respectively. No T-2 tetraol was detected at all sampling times. The total body Clearance (Cl) and the apparent steady-state volumes of distribution (Vss) for T-2 toxin were 0.662 L kg-1 and 0.038 L/min/kg. This study demonstrated that T-2 toxin is rapidly removed from the blood followed by its fast conversion to metabolites.
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