Influence of Cropping Systems on Soil Properties in Semi-arid Conditions of Setif, Algeria

The effects of two culture systems, conventional and no-till combined the previous crop （lentil and wheat） on soil properties were studied in the experimental site of the station Technical Institute for Field Crops （ITGC） Setif （Algeria） during the crop year 2011/2012. The results indicate that the no-till system affects positively the variables of soil properties and the organic matter has a rate of 2.89% compared to 2.44% in conventional tillage. If the conventional system has an infiltration of moisture relatively higher than that observed for no-till throughout the cycle, the no-tillage is distinguished by a higher storage of moisture at the end of cycle wheat cultivation. The results also indicate that the density （1.44 g/cm）, permeability （22.79 cm/h） and soil compaction （12.51 kg/cm） in no-till were significantly higher compared to conventional tillage 1.35 g/cm, 14.13 cm/h, 7.40 kg/cm, respectively.

内毒素、NO及NOS在危重病应激性高血糖中的作用研究

目的观察内毒素、一氧化氮(NO)及一氧化氮合酶(NOS)在危重病应激性高血糖(SHG)患者中的变化,探讨内毒素、NO及NOS对SHG的作用机理。方法选择危重病患者65例,根据血糖水平分为SHG组45例和应激非高血糖组20例,并选取20例健康体检者作为健康对照组,分别测定血中脂多糖(LPS)、NO、NOS、真胰岛素(TI)及血糖浓度。结果 SHG组APACHEⅡ评分及死亡率明显高于应激非高血糖组(P<0.05);SHG组及应激非高血糖组LPS水平均明显高于健康对照组(P<0.05);SHG组NO水平明显高于应激非高血糖组及健康对照组(P<0.05);SHG组及应激非高血糖组NOS水平明显高于健康对照组(P<0.05);SHG组HOMA-β明显低于应激非高血糖组及健康对照组(P<0.05);LPS与血糖呈正相关性(P<0.05),与HOMA-β呈负相关性(P<0.05);NO与血糖呈正相关性(P<0.05),与HOMA-β呈负相关性(P<0.05)。结论内毒素及NO可能通过抑制胰岛β细胞的分泌而参与SHG的发生,通过纠正内毒素血症、阻断NOS的表达、减少NO的产生,可控制SHG。