DEGENERATIVE CHANGES IN THE VERTEBRAL COLUMN OF THE DOG     

Joe P.  Morgan  DVM  Vet med dr  Takayoshi  Miyabayashi  BVS  MS 《Veterinary radiology & ultrasound》1988,29(2):72-77

A group of 160 Beagles were studied radiographically to determine the pattern of degenerative changes within the vertebral column, especially involving the intervertebral discs. The normal radiographic appearance of both disc and surrounding vertebrae is described. Disc space narrowing and calcification of discal tissues provide radiographic patterns that assist in diagnosis and prognosis. Because of the older age of the dogs, severe degeneration of the endplates with marked instability between vertebral segments was seen.  相似文献   

正交试验设计应用要点及其DPS实施   总被引：2，自引：0，他引：2  

郭新梅 《现代农业科技》2012,(3):40-41,44

正交试验设计是进行多因素试验最简单、精确的方法,系统阐述了正交试验应用的重要知识点,包括指标、因素、水平的选择,因素间互作列及空列的合理设置,并详细介绍了如何利用DPS软件进行正交试验设计与数据分析,以期促进正交试验设计的合理使用。  相似文献   

毛细管柱气相色谱法测定驱鸟剂中邻氨基苯甲酸甲酯     

王兴民  王文刚  刘书花  周延生  李景超 《现代农业科技》2012,(17):223+227

用色谱级无水乙醇超声萃取驱鸟剂中邻氨基苯甲酸甲酯,毛细管柱气相色谱法测定,试验结果表明,其相关系数为0.999 8,超声萃取效率达到87.8%以上,方法简单、准确、灵敏度高。  相似文献   

一种采用阴离子交换柱快速纯化Taq DNA聚合酶的方法     

余彦  李程勋  陈树清  叶长亮  黄力坤  许铁城  林文雄 《福建农业学报》2012,27(7):734-738

通过37℃恒温振荡培养含有Taq DNA聚合酶基因的E.coli菌株,并用IPTG诱导该基因表达获得TaqDNA聚合酶蛋白,利用40％硫酸铵沉淀该蛋白后溶解于storage buffer中.此法获得的Taq DNA聚合酶带负电荷,因此采用阴离子交换柱纯化蛋白.试验结果表明,此法与传统的透析方法相比能快速地去除生物小分子杂质,同时去除透析方法无法除去的杂蛋白;既能保证Taq DNA聚合酶的生物学活性,同时能缩短纯化时间、提高Taq DNA聚合酶的纯度.以土壤微生物DNA、水稻cDNA为模板进行PCR扩增并对扩增产物进行测序,结果显示纯化后的Taq DNA聚合酶具有较高的扩增效率和保真性.  相似文献   

HPLC Analysis of α-lactalbumin and β-lactoglobulin in Bovine Milk with C4 and C18 Column     

Kong Xiao-yu  Wang Jing  Tang Yan-jun  Li Dan-dan  Zhang Nan-nan  Jiang Jin-dou  Liu Ning 《东北农业大学学报(英文版)》2012,19(3):76-82

Reversed-phase high-performance liquid chromatography (RP-HPLC) method with C4 column and C18 column for analyzing β-lactoglobulin and α-lactalbumin in bovine milk was developed and the performance and...  相似文献   

《塔里木大学学报》2008～2010年度载文被引用分析     

朱晶晶 《塔里木大学学报》2012,24(2):47-49

利用CNKI中国引文数据库的引文检索功能,统计了《塔里木大学学报》2008～2010年度载文被引用情况,通过数据进行分析,指出学报当前存在的主要问题,以期为发挥区域和高校优势,提高高校科技期刊办刊质量提供借鉴依据。  相似文献   

土壤盐分对土壤水分扩散率的影响   总被引：3，自引：0，他引：3  

甘永德  胡顺军  陈秀龙 《水土保持通报》2010,30(6):56-59

土壤水分扩散率是土壤水盐运动的重要参数之一。利用水平土柱吸渗法对不同含盐量土壤的水分扩散率与含水量之间的关系进行了测定,并建立了土壤水分扩散率、土壤含水量与Boltzmann参数间的定量关系。结果表明,不同含盐量土壤之间的水分扩散率存在明显差异,表现在相同土壤含水量情况下,土壤水分扩散率随土壤含盐量的增大而增大;土壤水分扩散率随土壤含水量增大而单调增大,且当含水量接近饱和时,土壤水分扩散率接近无穷,通过建立含水量与土壤水分扩散率的经验函数关系能较好地反映了土壤含水率与土壤水分扩散率间的关系。  相似文献   

Modeling and Its Application of Reinforced Concrete Columns Considering Nonlinear Shear Effects     

Lei Tuo  Qian Jiang  Liu Boquan 《保鲜与加工》2013,(4):13-19

A fiber beam-column element in conjunction with zero-length elements attached to its ends was proposed to simulate the flexural and shear mechanism respectively. Based on the Limit State Material model and the Shear Limit Curve model provided by OpenSees, the nonlinear shear effect of reinforced concrete column and its coupling with the flexural effect were defined. The reliability of the proposed model was validated by means of comparisons with existing test results. Finally, a plane frame from in-situ pushover test was simulated. It is shown that the proposed method, by taking the nonlinear shear effect into account, produces satisfactory results for frame columns with shear strength and stiffness degradation, while the conventional fiber beam-column element can hardly simulate actual flexure-shear failure mechanism for columns characterized by insufficient transverse reinforcement. The proposed method is applicable for nonlinear analysis of reinforced concrete frame structures with shear deficiencies.  相似文献   

粉煤灰条形柱在水土保持坡改梯工程中的推广应用          下载免费PDF全文

刘中田 《中国水土保持科学》2008,6(Z1):112-113

通过对粉煤灰条形柱的特点分析,探讨粉煤灰条形柱在坡改梯工程中的应用.认为粉煤灰条形柱的应用缓解了大竹县条石紧缺矛盾,减少了对环境的污染,提高坡改梯埂坎的安砌质量和科技含量,减少劳动强度,降低工程造价,减少水土流失,美化周边环境,应扩大粉煤灰条形柱的应用范围.  相似文献   

The effect of micro-heterogeneity and capillary number on capillary pressure and relative permeability curves of soils   总被引：2，自引：0，他引：2  

C.A. Aggelopoulos  C.D. Tsakiroglou 《Geoderma》2008,148(1):25-34

The determination of the two-phase flow coefficients (such as the capillary pressure, P_c, and relative permeabilities, k_rw, k_ro) is of a key importance to model the two-phase flow processes taking place during contaminant transport in subsurface. In the present work, transient immiscible displacement experiments are performed at various flow rates on long disturbed soil columns. The capillary pressure-saturation-relative permeability relationships of soils characterized by narrow and broad grain size distributions are estimated with inverse modeling from rate-controlled displacement experiments and are correlated with the grain size variability and ratio of viscous to capillary forces (capillary number). A soil core holder assembled with electrodes is constructed to monitor the axial distribution of water saturation. A new technique is developed to determine the water saturation averaged over successive segments of the soil column by measuring the transient responses of the electrical resistance between vertical ring electrodes. The transient responses of the average oil (water) saturation in five segments along with the total pressure drop across the soil column are introduced into an inverse modeling numerical solver of the macroscopic two-phase flow equations to estimate simultaneously the capillary pressure and relative permeability curves under dynamic conditions. The water and oil relative permeabilities increase drastically with the capillary number, while the capillary pressure curve of soils with broad grain (pore) size distribution is wider than that of soils with narrow grain (pore) size distribution. For soils with high variability of grain sizes, the irreducible wetting phase saturation is higher, the relative permeability curves are sharper and the end oil relative permeability is higher compared to soils with low variability of grain sizes.  相似文献