少花龙葵和三叶鬼针草对甲磺隆抗性的初步研究

在施用甲磺隆的抗性观察圃里 ,跟踪调查杂草的抗性生物型 ,采集表现抗性的杂草———少花龙葵和三叶鬼针草种子 ,用生物测定和生化分析方法 ,进行其抗性水平测定。结果表明 ,连续 2年 4次施用甲磺隆的少花龙葵和三叶鬼针草 ,只有少花龙葵表现抗性 (抗性因数为 2 19,等浓度防效降低 2 9% ,敏感性比为 1 5 8,乙酰乳酸合酶的活性比为 1 6 1)。

农田杂草对甲磺隆的抗性试验

报道了 1997～ 1998年两年间抗性观察圃施用除草剂甲磺隆后 ,杂草种类的变化 ,总趋势是杂草种类增多、多年生杂草上升。其中三叶鬼针草表现数量由少变多 ,植株高度随甲磺隆处理浓度加大而变矮的抗性变化现象。

小儿金宁口服液的解热、镇痛、抗炎作用研究

目的:观察小儿金宁的解热、镇痛、抗炎作用。方法:采用内毒素、干酵母致热法观察其解热作用;采用扭体法、热板法观察其镇痛作用;采用二甲苯致小鼠耳肿胀法和醋酸致小鼠腹腔毛细血管通透性增高法观察其抗炎作用。结果:小儿金宁(4.1、8.2、16.4g/kg)可显著抑制内毒素所致发热反应,小儿金宁(6.85、13.7、27.4g/kg)可显著抑制干酵母所致发热反应;小儿金宁(13.7、27.4、54.8g/kg)对醋酸和热板诱发的小鼠疼痛有明显的抑制作用,可减轻二甲苯所致小鼠耳肿胀度,降低醋酸引起的小鼠腹腔毛细血管通透性增高。结论:小儿金宁具有明显的解热、镇痛和抗炎作用。

Development of impact resistant 3D printed multi-layer carbon fibre reinforced composites by structural design

In this study,a high impact resistant multi-layered composite consisting of continuous carbon fibre/nylon(CCF)and short carbon fibre/nylon(SCF)layers is developed via 3D printing technology.The effect of CCF/SCF layers configuration on the impact resistance is investigated by low-velocity impact test,and the impact failure mechanism of the 3D printed composites is explored by microscopic observations and finite element(FE)simulation analysis.The results show that the 3D printed multi-layered composite with SCF layers distributed in the middle(HFA)exhibits higher impact resistant performance than the specimens with alternating SCF/CCF layers(HFB)and CCF layers distributed in the middle(HFC).The effect of CCF/SCF layers proportion on the impact performance is also studied by FE simulation,and the results show that the specimen with a CCF/SCF proportion of 7.0 exhibits the highest impact strength.