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Articles by Xia Zhang
Total Records ( 9 ) for Xia Zhang
  Xia Zhang , Xiaoping Huang and Liangmin Huang
  In coastal cultural regions of Dapeng Cove (southwest of Daya Bay), the composition, abundance and community structure of phytoplankton, as well as physicochemical variables, were investigated to identify factors driving seasonal changes. During summer, local phytoplankton biomass was low, probably because of nutrient depletion. In September, sudden heavy rainfalls resulted in a substantial increase in nitrogen. As a result, a disturbance-tolerant diatom, Skeletonema costatum, increased rapidly. Organic matter associated with freshwater runoff, fishery activities and settled algal cells increased consumption of dissolved oxygen (DO), especially in fish farms. It was suggested that heavy rainfall events was probably a trigger of low oxygen level and exerted a major effect on nutrient cycling and the phytoplankton community. In winter, phytoplankton community was characterized by dinoflagellates, which are adapted to well-mixed conditions. Spring blooms composed of Pseudonitzschia delicatissima and P. pungens were triggered by warm temperature and increasing light intensity. Excessive ammonium levels in March probably contributed to bloom initiation. Dissolved inorganic nitrogen (DIN) and total phosphorus (TP) concentrations in fish farms were significantly higher than that in bivalve cultures and control sites although phytoplankton abundance in fish farms was not. We suggest that intense fish culture farming exerts more pressure on the ambient environment than shellfish farming.
  Hui Wang , Xia Zhang , Pengcheng Dong , Yongjiang Luo and Fusheng Cheng
  Microbial polysaccharides are located both inside the fungal cell walls and on the fungal cell surfaces and possess marked immunological properties. In this study, the extraction conditions of Saccharomyces cerevisiae polysaccharides (SCPS) were optimized using response surface methodology and the immune enhancement properties of SCPS were evaluated. The results indicated that the optimal extraction conditions were high pressure homogenization time of 35 min, ultrasonic power of 510 W and ultrasonic time of 26 min, respectively. Under these conditions, the maximal observed value extraction yield of S. cerevisiae polysaccharides (SCPS) was (29.84±0.09)%, which was agreed with predicted value 29.82%. Thin layer chromatography (TLC) exhibited SCPS may be a glucan. Pharmacological experiments indicated that SCPS could increase alkaline phosphatase (AKP), lysozyme (LZM), immunoglobulin A (IgA), immunoglobulin G (IgG) and Epidermal Growth Factor (EGF) levels in serum, increase secreted immunoglobulin A (SIgA) expression in jejunum secretion and decrease prostaglandin E2 (PGE2) expression in colon of immune-compromised rats at medium-dose. Saccharomyces cerevisiae polysaccharides has significant immune enhancement activity and could obviously protect intestine mucosa of immune-compromised rats.
  Hui Wang , Xia Zhang , Fu-Sheng Cheng , Yong-Jiang Luo and Peng-Cheng Dong
  The aims of the present study were to investigate the immune enhancement effect and production performance of Yeast Polysaccharide (YPS) on rats. The results showed that each index in YPS groups was higher than that in blank control group. Any dose of YPS by orally administrated significantly raised spleen and thymus index, serum IgA, IgG, AKP and LZM level, phagocytic index and phagocytic activity of macrophages in the rats. Meanwhile it can increase production performance of rats. Results suggested that any dose of YPS can enhance immunologic function and production performance of rats and the dose of 100 mg kg-1 has the most obvious efficacy.
  Peng-Cheng Dong , Xia Zhang , Fu-Sheng Cheng and Yan-Ming Wei
  To investigate the immunological activity of Iron-Zymosan (IZS) extracted from iron-yeast cells. The mice were taken as research object, the expression IL-2 mRNA and IL-2R mRNA were evaluated in mice spleen cells, the amount of IgA+ cells were assayed in intestinal mucosa and the content of lgA was detected in serum of mice. The results showed that IZS had immunoregulatory activity and could be explored as a novel iron-zymosan source in dietary supplements.
  Xinxin Xu , Xiaoxia Liu , Ting Sun , Xia Zhang and Enbo Wang
  We have synthesized four coordination polymers with two different nitrogen containing organic ligands and different lanthanide metal ions, under hydrothermal condition. [lcubLn2(bpdc)3(H2O)2rcub]n (Ln = Dy (1), Sm (2)) (bpdc = 2,2-bipyridine-3,3-dicarboxylic acid) are isostructural, with 2-D supramolecular layer structure composed from 1-D chains. Like 1 and 2, [lcubLn(pzda)2(H2O)2rcub · 4H2O]n (Ln = Dy (3), Nd (4)) (pzda = pyrazine-2,6-dicarboxylic acid) are also isostructural with 1-D chain-like structures. The photoluminescence of 2 is studied.
  Yan Xiao , Caifeng Bi , Yuhua Fan , Shanbing Liu , Xia Zhang , Dongmei Zhang , Yilong Wang and Rong Zhu
  To investigate the structure-activity relationship of L-glutamine and L-asparagine Schiff base copper complexes in applications, L-glutamine and L-asparagine Schiff bases (GV and AV) and their copper complexes [Cu3(GV)2(CH3COO)2(H2O)] · 2H2O (GVC) and [CuAV(H2O)3] (AVC) have been synthesized and characterized by molar conductance, elemental analysis, UV-Vis, IR, 1H-NMR, and TG-DTG. We examined the geometries of GV, AV, GVC, and AVC through Hartree-Fock method and electronic absorption spectra. We also tested their antibacterial activity against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Bacillus subtilis bacteria and antiproliferation activity on human breast cancer MDA-MB-231 cells. The side chain difference between L-glutamine and L-asparagine results in different geometry of GV and AV, which leads to different geometry of GVC and AVC. GVC, a trinuclear Cu(II) complex, shows the highest antibacterial activity and the highest growth inhibition activity on MDA-MB-231 cells. Our results suggest that GVC has potential as an antibacterial and anticancer agent.
  Xinxin Xu , Xiaoxia Liu , Xia Zhang and Ting Sun
  Five new coordination polymers synthesized from d10 metal ions, aliphatic carboxylic acids, and bidentate nitrogen ligands have been characterized with single crystallographic X-ray analysis, IR, and TG. Compound 1 has a twofold 3-D network. During the synthesis of 1, fumaric acid reacts with water giving malic acid, which coordinates Cd forming 2. If we use Zn instead of Cd, 1-D chain-like 3 is formed. With hydrogen bonds and π-π interactions, the 1-D covalent chains form a 3-D supramolecular network. The 3-D supramolecular networks connect together and form a twofold interpenetration structure. Compound 4 shows a 2-D layer structure. Compound 5 exhibits 1-D double-chain structure composed by hydrogen bonds. We studied the fluorescence of 1, 2, 3, and 5.
  Jian-She Hu , Li-Qun Yang , Xia Zhang and Zhi-Wei Song
  The synthesis of five new cholesteryl-based monomers (M-1-M-5) and the corresponding smectic comb-like polymers containing cholesteryl groups (P-1-P-5) is presented. The chemical structures were characterised by FT-IR, 1H NMR and elemental analyses. The specific optical rotations were evaluated with a polarimeter. The phase behaviour was investigated by polarising optical microscopy, differential scanning calorimetry, thermogravimetric analysis, and X-ray diffraction. The specific optical rotation values of these monomers and polymers with the same number of phenyl rings and terminal groups were nearly equal; however, they decreased with increasing the aryl numbers in the mesogenic core. The monomers M-1-M-5 showed oily streak and focal conic optical textures, or finger print textures characteristic of the chiral nematic phase. The polymers P-1-P-5 showed the smectic A phase. The melting, clearing, and glass transition temperatures increased, and the mesophase temperature ranges widened with increasing the aryl number in the mesogenic core. However, although the molecular structures of M-4 and M-5 were similar to those of M-3, namely their mesogenic cores contained three phenyl rings, their phase behaviour differed considerably, and Tm and Ti of M-4 and M-5 were less than those of M-3. In addition, M-4 and M-5 showed a clear glass transition similar to the polymer. Furthermore, the ester linkage bond and aryl arrangement in the mesogenic core also affected the phase behaviour.
  Yuzhen Liu , Xia Zhang , Chao Chen , Guobin Zhang , Pengshou Xu , Dapeng Chen and Lijun Dong
  SiCN thin films were prepared by high-dosage (2 x 1017 cm- 2) C+ ion implantation into α-SiNx:H films. The prepared films were then processed by thermal annealing for 2 h at 800 °C, 1000 °C and 1200 °C respectively. The composition and bond structure of SiCN were analyzed by X-ray photoemission spectroscopy, Auger electron spectroscopy, Raman spectroscopy and X-ray diffraction, and photoluminescence. Ternary structure with N bridging C and Si of the film annealed at 800 °C was found. The luminescent properties of SiCN have also been studied by synchrotron radiation at 20 K. Four emission bands were observed, corresponding to 2.95, 2.58, 2.29 and 2.12 eV at 20 K, respectively. In this paper, we report the experimental results and try to explain them.
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