不同田间配置方式对水稻穗颈组织的影响

用3个水稻品种在两种行距和两种穴苗数的不同田间配置方式下，观察水稻穗颈组织性状。结果表明，颈横切面积、颈壁面积、总维管束面积3个性状。在不同品种间存在显差异，不同田间配置方式对穗颈组织影响较小。     

格拉成品油管道腐蚀问题及其对策

通过对格尔木－拉萨的成品油管道进行全面腐蚀情况检测和防腐补漏工作，发现该管道腐蚀问题比较严重，一方面，防腐层老化、剥离并遭到破坏；另一方面，穿跨河流、冰丘、冰锥、盐碱滩、沼泽地段的管道出现腐蚀穿孔。出现严重腐蚀的原因是设计、施工的缺陷、复杂的地理地质条件和管理使用方面的问题。介绍了采取的相应措施，即加强阴极保护系统的管理、管道防腐检漏、补漏以及管道水工保护工作。同时还就格位管道防腐问题提出了看法和     

酸性化学污染物的运移与腐蚀对堤坝边坡长期稳定性的影响

已建工程的长期稳定性问题直接影响着工程的服务年限与安全性。由于近年来部分水资源的水质逐步恶化,而水质的恶化对岸坡工程安全性的影响已引起人们的密切关注。研究借助多孔介质渗流方程、污染物离子交换化学作用的浓度扩散方程、酸性污染物对土体抗剪强度的损伤演化方程,建立了酸性化学污染物运移与腐蚀对堤坝边坡长期稳定性影响的数值分析方法,并运用二维有限元分析了某河道污染物排泄口附近堤坝边坡的污染物随时间运移过程与稳定安全系数随污染物迁移程度变化情况。结果表明,由于酸性污染物的腐蚀作用,使堤坝边坡的安全系数减小明显,10年间下降了约10%。说明在污染源附近的重要堤坝边坡的长期稳定性不容忽视,应在实际工程中加强观测、及时补强。     

热喷涂铝覆盖层在防腐中的应用

目前我国钢结构件的防腐大多沿用传统的涂刷油漆方法，其防护周期较短，维修频繁，不仅消耗大量的人力物力，而且对连续运作的钢铁构件正常运行造成很大困难。热喷涂主其复合覆盖层用于钢结构件的长效防腐有其特有的优越性。这种覆盖层是利用热源将铝比溶化再经高压空气雾化成细小颗粒，高速撞击到经过预处理的钢基体表面上，堆积而成的覆盖层。热喷涂的喷涂工艺常采用火焰喷涂和电弧喷涂。通过各项数据比较，认为电弧喷涂的质量优于     

Effect of concentrated decoction of Chinese herbal compound Buyanghuanwutang on cAMP-PKA-CREB signaling pathway in hippocampus of rats with vascular dementia

AIM: To evaluate the role of concentrated decoction of Chinese herbal compound Buyanghuanwutang (BYHWT) in cyclic adenosine monophosphate(cAMP)-protein kinase A(PKA)-cAMP response element-binding protein(CREB) signaling pathway in hippocampus of rats with vascular dementia (VD). METHODS: The rats were randomly divided into sham operation group (sham-operated rats treated with normal saline), VD model group (VD rats treated with normal saline), BYHWT treatment group (VD rats treated with BYHWT) and nimodipment treating group (VD rats treated with nimodipine). The rat model of VD was build by the method of four-vessel occlusion. The rats in all 4 groups were administered with the corresponding reagents for successive 30 days. The content of cAMP was measured by radioimmunoassay. The expression of PKA catalytic subunit (PKAc) was observed by Western blotting. The changes of DNA-binding activity of CREB in rat hippocampus were detected by electrophoretic mobility shift assay. RESULTS: The content of cAMP, the expression of PKAc and the DNA-bingding activity of CREB in the hippocampus of VD rats were lower than those in the hippocampus of sham-operated rats (P<0.01). The above indexes in both nimodipine treatment group and BYHWT treatment group were definitely higher than those in VD model group (P<0.01). CONCLUSION: BYHWT increases the content of cAMP, the expression of PKAc and the DNA-binding activity of CREB in VD rat hippocampus, thus strengthening the cAMP-PKA-CREB signaling pathway.     

K_(Ca)3.1通道与血管功能的研究进展

研究表明,在促进血管疾病发展的众多细胞类型中,如T细胞、B细胞、内皮细胞、成纤维细胞、巨噬细胞以及去分化的平滑肌细胞,KCa3.1都起到了一定的作用。生理上,KCa3.1已被证明在乙酰胆碱及内皮源性超极化因子(EDHF)介导下发生超极化,从而发挥控制血压的作用。病理上,KCa3.1异常则可导致血管平滑肌细胞增殖迁移。因此,从KCa3.1在内皮细胞及平滑肌细胞两方面对其作用作一总结,并对KCa3.1通道的研究进展进行综述。     

水城县严重侵蚀地段不同治理模式的水土保持功能研究

对贵州西部水城县严重侵蚀地段3种治理模式及对照的水土保持功能进行了研究。结果表明:3种治理模式的水土保持功能大小顺序为模式Ⅲ>模式Ⅱ>模式Ⅰ,其土壤容重分别比对照减少了37.6％,21％和26.6％;土壤饱和持水量比对照增加了82％,43.5％,61.7％;土壤通气度是对照的2.26,1.44,1.16倍。抗侵蚀能力是对照的3.16,2.67,2.06倍。模式Ⅲ渗透性最强,其初渗速度和稳渗速度分别是对照的1.87和2.10倍,是模式Ⅱ的1.05和1.34倍,是模式Ⅰ的1.45和1.62倍。模式Ⅲ的枯落物层持水能力最强,为11.07 t/hm~2,分别是模式Ⅱ的1.26倍、模式Ⅰ的1.98倍。     

Evaluation of a wild lentil collection for resistance to vascular wilt

Vascular wilt caused byFusarium oxysporum f. sp.lentis Vasud. & Srin. is the major disease of the cultivated lentil (Lens culinaris Medikus). Host plant resistance is the most practical method of disease management. Wild lentils represent an unexplored potential source for disease resistance and other characters. Screening 219 accessions of wildLens Miller and 2 accessions ofVicia montbretii Fisch. & Mey. (syn.Lens montbretii (Fisch et Mey) Davis et Plitm.) for resistance to a Syrian isolate of this fungus at the seedling stage was conducted under artificial inoculation in a plastic house. Resistance at the reproductive growth stage was confirmed in pots in a plastic house and in a wilt-sick plot. Three accessions each ofLens culinaris ssp.orientalis (Boiss.) Ponert andL. nigricans M.B. Godr. ssp.nigricans Godr. and 2 ofL. nigricans ssp.ervoides (Brign.) Lad. maintained their resistance at the reproductive growth stage in the plastic house. All accessions ofL. culinaris ssp.odemensis Lad. andV. montbretii were susceptible. However, in the sick-plot only three accessions (ILWL 79 & ILWL 113 ofL. culinaris ssp.orientalis and ILWL 138 ofL. nigricans ssp.ervoides) maintained a good level of resistance. Resistance at the seedling stage was often found in accessions collected from northern and western sites of the distribution of the genus at low elevations. The most resistant accessions in the field at the reproductive growth stage were from Syria and Turkey.     

钼膦系缓蚀剂协同效应的分析

以钼酸钠(Na2MoO4.2H2O),1-羟基乙叉二膦酸(HEDP)和硫酸锌(ZnS04.7H20)为原药,分别组成一元、二元和三元等复合缓蚀剂配方,通过不同的实验方法(失重法和电化学方法)研究了钼膦系缓蚀剂对碳钢在循环冷却水中的缓蚀协同效应,着重讨论了钼膦系缓蚀剂对不同材质在不同介质中,缓蚀剂对腐蚀速率和缓蚀的影响。通过大量的实验,用三角形图解法研究了在实验浓度范围内,缓蚀率、腐蚀速率与缓蚀剂配方浓度比之间的变化规律。为开发新一代低成本、高效能的钼磷系复配缓蚀剂提供了经济、高效的配方和准确、可靠的理论依据。