地衣芽孢杆菌NJWGYH 833051的抑菌作用

通过地衣芽孢杆菌(Bacillus licheniformis)对不同病原菌平板抑制试验以及在植物上的定殖试验,初步研究其抑菌作用。结果表明,地衣芽孢杆菌对番茄叶霉病菌有较好的抑制作用。     

RP-HPLC法测定当归片中阿魏酸的含量

[目的]建立当归片中阿魏酸含量的RP-HPLC测定方法。[方法]采用反相高效液相法,以阿魏酸对照品作为内部标准品测定自制当归片中阿魏酸的含量。[结果]阿魏酸在8.341.6μg/ml范围内呈现良好线性关系,加样回收率为99.9%,RSD=0.51%（n=6）。[结论]高效液相法操作简单、准确、重复性好、精密度高,可作为当归片的质量控制方法。     

高效液相色谱法测定复方妥英麻黄茶碱片含量均匀度条件的优化

目的对复方妥英麻黄茶碱片含量均匀度测定条件进行优化。方法采用高效液相色谱法测定含量均匀度。结果优化选择Dikma Technologies C18 5μm 250×4.6mm色谱柱,流速:1 mL/min,检测波长:215nm,柱温:30℃。结论优化后的方法快捷、准确、可靠。     

Influence of FGD Gypsum on the Properties of a Highly Erodible Soil under Conservation Tillage

Surface application of agricultural lime and fertilizers in no-till (NT) systems can be inadequate because of the excess time required for slowly soluble lime to improve soil aggregation such that water and nutrients move more rapidly into and down the soil profile. This study used fluidized gas desulfurization (FGD) gypsum as an alternative to lime because of its greater solubility and calcium (Ca) and sulfur (S) contents. Gypsum was applied to NT cotton (Gossypium hirsutum L.) plots at rates of 0, 2.24, 4.48, and 6.72 Mg ha^?1 for 3 years. After 1 year, Ca, S, and soil aggregation increased significantly (P ≤ 0.05) while exchangeable aluminum (Al) activities were reduced. These results indicate that FGD gypsum can increase NT cotton yields by increasing infiltration and soil water contents, reducing runoff, ameliorating exchangeable Al problems, and by providing a readily available source of S, a limiting nutrient in many cotton soils.     

地美硝唑盐片剂的制备及体外溶出度

采用紫外分光光度法，对用淀粉、糊精和微晶纤维素等辅料制备的地美硝唑盐片剂和未成盐地美硝唑片剂进行了体外溶出度和释药动力学的比较研究。结果表明，在人工肠液中，两者累积释药50％的时间分别为7.59min和18.26min，前者的溶出速率明显快于后者。本品在45min内可溶解80％以上，释药规律符合Weibull方程。