广元市多花黑麦草品比试验

对8个多花黑麦草品种从生育期、产草量、茎叶比等方面进行了比较研究，结果表明：特高多花黑麦草l产量最高，其干物质产量为19397kg／hm^2；蓝天堂产量次之，其干物质产量为18242kg/hm^2；特优多花黑麦草产量最低，其干物质产量为14770kg/hm^2。从总体上来看，各个品种之间产量有一定的差异，但是产量差异不显著。     

Iodoacetamide attenuates cognition impairment and amyloid deposit in an AD rat model

AIM:To investigate the effect of an insulin-degrading enzyme (IDE) activator, iodoacetamide, on an AD rat model. METHODS:Thirty-two male Wistar rats were divided into 4 groups:Aβ group, Aβ+ iodoacetamide group, iodoacetamide group and control. Each group included 8 subjects. Aβ was injected into the CA3 area of bilateral hippocampi;Iodoacetamide was administered subcutaneously daily for 5 consecutive days before surgery. The behavior performance in the morris water maze was obtained. The level of Aβ was detected by immunohistochemistry staining and ELISA assay. RESULTS:Level of Aβ was significantly reduced in Aβ+iodoacetamide group compared with that of Aβ group (dropped by 24%), and the Aβ deposit decreased (by 23.9%), the cognition function of this group also greatly improved according to the behavior performance in the morris water maze. The mean escape latency in the place navigation was much lower compared to Aβ group and the times that rats acrossed the central platform in the spatial probe test was also elevated. CONCLUSION:Iodoacetamide significantly reduces the Aβ deposit in the hippocampus in an AD rat model and relieves memory loss.     

应用轻型飞机防治马尾松毛虫的试验Ⅰ．喷施四种药剂防治的效果

马尾松毛虫Dendrolimus punctatus Walker是马尾松林重要害虫。林间应用超轻型飞机大面积喷洒溴氰菊酯超低容量喷雾、白僵菌纯孢子油剂、菌药混合液超低容量喷雾以及喷洒白僵菌菌粉,其防治效果分别为96．5%、85．7%、95．6%、86．5%。上述的防治措施可作为单独的措施或综合防控中的配套措施使用,同时应用飞机防治解决了树高、林密、水源缺乏、劳力工资昂贵等条件给防治工作带来的困难,是一种适应林区林业生产整体水平而又快速、高效、经济的防治手段。     

气相色谱法测定咸鱼中的敌百虫和敌敌畏

建立了咸鱼中敌百虫、敌敌畏农药残留的气相色谱分析方法。样品采用乙腈-水(1 1)溶液提取,加乙酸锌净化,用乙酸乙酯进行液液分配,最后采用DB-1701P或DB-5毛细管柱分离,使用气相色谱-火焰光度检测器分析。在4个添加水平的敌百虫、敌敌畏平均回收率(n=6)分别为91%~95%、90%~94.5%,相对标准偏差分别为3.82%~5.80%和3.57%~4.62%;方法的检出限为:敌百虫0.005 mg/kg,敌敌畏0.005 mg/kg。该方法可用于市场上咸鱼样品中敌百虫、敌敌畏的测定。     

Influences of coculture with bone marrow mesenchymal stem cells on dopaminergic neurons in brain slice treated with 1-methyl-4-phenylpytidinium

AIM: To study the protective effects of bone marrow-derived mesenchymal stem cells on damaged dopaminergic neurons induced by 1-methyl-4-phenylpytidinium(MPP+).METHODS: The parkinson disease(PD) models were established in newborn rats. Bone marrow mesenchymal stem cells(MSCs) obtained from adult bone marrow were cultured, isolated and purified. MSCs were co-cultured with brain slice and the immunohistochemical technique, electron microscopy, propidium iodide staining were used to observe the changes of neurons. RESULTS: In the MPP+ treatment group, the neurites grew slowly and sparsely, dead cells were found in all regions. In the co-culture group, the neuritis grew densely, only a few cells were dead, the number of tyrosine hydroxylase(TH)-stained neurons increased and the structure of organellae was normal. CONCLUSION: MSCs may protect dopaminergic neurons against damage induced by MPP+. These results provide some data for cell transplantation therapy to Parkinsons disease.     

福建省农业机械化发展态势分析

农业机械化发展是实现现代农业建设的技术基础,强化福建省农业机械化建设,有利于提高农业生产效率,提升经济效益.文章阐述了农业机械化的作用,分析得出当前福建省农业机械化发展中存在服务体系不完善、市场信息不全面、政府扶持不到位的问题,并提出强化社会服务体系建设、做好交易市场建设工作、加大政府政策支持和资金投入力度的对策,以期为其他省市发展农业机械化提供参考.     

光照对棉花胚珠纤维离体发育的影响

分析了光照和黑暗条件下，对培养棉花胚珠纤维离体发育的影响。表明在其它条件相同时，纤维离体发育在基因型之间有很大的差异，光照对纤维的发育起了明显的抑制作用。无论受精胚珠还是未受精胚珠，在光照条件下其胚珠成活率、纤维诱导率、纤维生长量、胚珠鲜重均低于在黑暗条件。尤其是未受精胚珠，在光照条件下珂３１２ 与ＴＭ－ １虽能诱导产生纤维，但纤维诱导率很低，仅有８．１９％ 和４．９６％ ，纤维生长量为０．１６３７和０．１１３２，而浙５０６、罗甸铁子和徐州１４２无絮突变体均不能产生纤维。本试验表明：只有在黑暗条件下才适合纤维离体发育。