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Articles by Dongmei Zhang
Total Records ( 3 ) for Dongmei Zhang
  Dongmei Zhang , Weijiang Li , Wei Tang and Hezhong Dong
  A two-year field experiment was conducted to determine the effects of removal of early-fruiting branches (REFB) on yield, quality, and endotoxin expression in transgenic Bt (Bacillus thuringiensis) cotton (Gossypium hirsutum L.). Two early-fruiting branches of field-grown cotton plants were removed and retained at squaring to form the REFB and the control treatments, respectively. Lint yield, yield components, fibre quality, and Cry1Ac protein concentration in the first fully expanded young leaves on the main stem were measured. Results show that lint yields were increased by 5.1 and 5.5% with REFB compared with control in 2004 and 2005, respectively. There was no difference in fibre quality in the first two harvests between REFB and control, but fibre strength and micronarie in the third harvest were improved with REFB. Levels of total N, soluble protein, and Cry1Ac protein as well as glutamic-pyruvic transaminase (GPT) activity in leaves were higher in REFB than in the control. Laboratory bioassay showed significant enhancement of the control efficacy by REFB in terms of Helicoverpa armigera (Huumlbner) neonate mortality for both years. It is suggested that REFB might be a potential practice for enhancing transgenic Bt cotton production.
  Hezhong Dong , Weijiang Li , Wei Tang and Dongmei Zhang
  Uniform stand establishment is essential for profitable cotton (Gossypium hirsutum L.) production in saline fields. This study was conducted during 2003 and 2004 to determine if furrow-bed seeding and plastic mulching improve stand establishment and cotton lint yield in a saline field. The experiment was arranged in a split-plot design with seeding patterns (flat-seeded and furrow-seeded) as main plots and mulching (with or without plastic mulching) as subplots. The effects of seeding patterns, mulching, and their interactions on root-zone salinity, soil temperature, stand establishment, and lint yield were monitored. Furrow seeding reduced the root-zone salinity, while plastic mulching both reduced salinity and increased soil temperatures. As a result, furrow-seeded cotton under plastic mulching increased stand establishment and lint yield by 103 and 25% in 2003, and 92 and 22% in 2004, compared with flat-seeded cotton without mulching, respectively. Plastic mulching and furrow seeding also enhanced earliness as indicated by the percentage of the first two harvests. Physiological assay 30 d after seeding (DAS) showed that plastic mulching and furrow seeding substantially reduced Na+ accumulation both in root and leaf tissues, inhibited peroxidation of lipids, and improved leaf photosynthesis (Pn) and dry matter production. The overall results suggest that use of plastic mulching plus furrow-bed seeding would be a suitable cultural practice for enhancing cotton production in saline soils.
  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.
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