Fixation of Multiple Metals in Contaminated Soil by Different Passivators

The effects of 4 passivators, zeolite, lime, red mud and peanut shell biochar, on the fixation of Cd, Pb, Cu and Zn in acidic multi-metal contaminated soils were studied by passivator culture experiment in order to screen out the passivator with better fixation effects. The results showed that the soil pH values of zeolite, lime, red mud and peanut shell biochar increased significantly by 0.511.02, 0.821.29, 0.720.89 and 0.300.35 respectively. The effects of 4 passivators on the fixation of Cd and Zn in soil are lime>red mud>zeolite>peanut shell biochar. The order of effects on the fixation of Pb is red mud>lime>zeolite>peanut shell biochar. The order of the fixation effects of Cu is red mud>lime>peanut shell carbon>zeolite. The contents of Cd, Pb, Cu and Zn in the extractable state of CaCl2 decreased with the increase in the dosage of 4 passivators. Lime and red mud showed good fixation effects on Cd, Pb, Cu and Zn. The contents of Cd, Pb, Cu and Zn in the extractable state of CaCl2 at the low dosage(2.5 g/kg) of lime and red mud decreased by 41%, 84%, 76% and 83% respectively. Soil pH value was negatively correlated with CaCl2-Cd, Pb, Cu and Zn(P<0.01). Lime and red mud had significant fixation effects on Cd, Pb, Cu and Zn in acidic multi-metal contaminated soils at low application dosages.

A Study on Combining Ability and Heritability of Agronomic Trait of Indica Hybrid Rice

In present study, under North Carolina design Ⅱ, 5 sterile lines and 2 restorer lines were analyzed by crossing test so as to study the combining ability, habitability and correlation of each major agronomic characters. The results showed that plant height, panicle length, filled grains per plant, grains per plant, 1 000-grain weight, yield per day, yield per plant by parent gene additive effect, seed set of parent gene additive and the additive effect work together, additive effect played a relatively important role, effective tillers per plant by additive genes of the parents and the additive effect had more consistent effects on offspring traits. General combining ability effect analysis showed that the better parents were P1A and R102. The special combining ability of plant height and panicle length in hybrid rice combination was mainly correlated with the general combining ability of restorer line, whereas not with the general combining ability of parent. For the other 7 traits, if the general combining ability of both parents was higher, the special combining ability of hybrid F1 combinations was also higher. The best combination of special combining ability of 9 traits in hybrid rice was P2 A/R102, followed by P1 A/R102.

厚朴酚与和厚朴酚对大鼠回肠短路电流的影响

目的:研究厚朴酚与和厚朴酚对大鼠回肠短路电流的影响。方法:应用体外Ussing chamber系统评价50μmol/L、100μmol/L、200μmol/L厚朴酚或和厚朴酚对回肠短路电流的作用。结果:厚朴酚与和厚朴酚均能明显抑制大鼠回肠的短路电流,且短路电流呈浓度依赖性降低,同时,其对短路电流的抑制效应显著高于钙通道阻滞剂维拉帕米;不同浓度的厚朴酚与和厚朴酚预处理可以显著降低10μmol/l乙酰胆碱激活的短路电流的增加。结论:厚朴酚与和厚朴酚可抑制大鼠回肠的短路电流,其作用机制可能是作为钙离子拮抗剂,通过调控肠道钙离子通道功能来抑制钙离子或其他离子的转运。