60%吡唑嘧菌酯·代森联水分散粒剂防治柑橘树脂病试验

通过室内毒力试验测定了60%吡唑嘧菌酯·代森联水分散粒剂及添加助剂对柑橘树脂病病原菌的毒力,并通过田间药效试验探索了60%吡唑嘧菌酯·代森联水分散粒剂及添加助剂对柑橘树脂病的防治效果。室内毒力测定结果表明:60%吡唑嘧菌酯·代森联水分散粒剂、60%吡唑嘧菌酯·代森联水分散粒剂+哈速腾、60%吡唑嘧菌酯·代森联水分散粒剂+甘键对柑橘树脂病病原菌的EC50分别为0.425μg/mL、0.409μg/mL、0.404μg/mL,各处理间差异不显著,但添加助剂甘键、哈速腾后对60%吡唑嘧菌酯·代森联水分散粒剂的毒力有一定程度的提高。大田试验结果同样显示各药剂处理间药效差异不显著,但对柑橘叶片树脂病的防治效果均在80%以上,对柑橘贮藏期果实树脂病的防治效果均在90%以上。

All-atom Molecular Dynamics Simulationsand NMR Spectroscopy Study on Interactions and Structures in N-Glycylglycine Aqueous Solution

All-atom molecular dynamics （MD） simulation and the NMR spectra are used to investigate the interactions in N-glycylglycine aqueous solution. Different types of atoms exhibit different capability in forming hydrogen bonds by the radial distribution function analysis. Some typical dominant aggregates are found in different types of hydrogen bonds by the statistical hydrogen-bonding network. Moreover, temperature-dependent NMR are used to compare with the results of the MD simulations. The chemical shifts of the three hydrogen atoms all decrease with the temperature increasing which reveals that the hydrogen bonds are dominant in the glycylglycine aqueous solution. And the NMR results show agreement with the MD simulations. All-atom MD simulations and NMR spectra are successful in revealing the structures and interactions in the N-glycylglycine-water mixtures.