Accumulation and Mobility of Salts in Soil as Influenced by Primary Biomethanated Spentwash     

《Communications in Soil Science and Plant Analysis》2012,43(22):2947-2963

A soil column laboratory experiment was carried out at the central campus, Mahatma Phule Agricultural University, Rahuri, India during 2008–2009 to study the accumulation and mobility of salts in Typic Haplusterts as influenced by primary biomethanated spentwash (PBSW). The PBSW was applied in three different levels (0.5, 1.0, and 2.5 cm) and then tap water with low salinity and low sodium hazard (C₁S₁ class) was used to carry out leaching in four different levels of water at the pore volume of soil (WPVS) (0.5, 1.0, 1.5, and 2.0). The electrical conductivity (EC) in the soil increased significantly with increasing levels of PBSW and decreased with increasing levels of WPVS in surface (0–15 cm deep) and subsurface (15–30 cm deep) soil layers. The exchangeable calcium (Ca²⁺), magnesium (Mg²⁺), and potassium (K⁺) increased, whereas exchangeable sodium (Na⁺) decreased with increasing levels of PBSW and WPVS in surface and subsurface layers of soil. The organic carbon content increased with increasing levels of PBSW and decreased with increasing levels of WPVS in both the soil layers. The cation exchange capacity (CEC) increased with increasing levels of PBSW and WPVS in both the soil layers. The exchangeable sodium percentage (ESP) decreased with increasing levels of PBSW and WPVS over the initial values of soil in both the layers. The pH of saturated paste (pHs) was reduced and electrical conductivity of extract (ECe) was increased with increasing levels of PBSW and WPVS in both the layers. The Na⁺ content of saturation paste extract increased significantly with increasing levels of PBSW and WPVS in both the soil layers.  相似文献   

Column Holdup Formula of Soil Solute Transport     

WANG YU  ZHANG YIPING 《土壤圈》2000,10(1)

The shortcomings of the present two formulae for describing column holdup are analyzed and deductions are made to find a new formula. The column holdup, Hw, described by the new formula is dimensional,and related to soil solute transport kinesis and column physical properties. Compared with the other two column holdups, Hw is feasible to describe dimensional column holdup during solute transport process. The relationships between Hw and retardation factor, R, in different solute transport boundary conditions are established.  相似文献   

Calcification of the intervertebral discs and curvature of the radius and ulna: a radiographic survey of Finnish miniature dachshunds     

Lappalainen A  Norrgård M  Alm K  Snellman M  Laitinen O 《Acta veterinaria Scandinavica》2001,42(2):229-236

The vertebral column of 124 randomly selected miniature dachshunds, representing 4.5% of the population registered by the Finnish Kennel Club during the years 1988 to 1996, were radiographed. The front legs were also radiographed in order to evaluate the curvature of the radius and ulna. Calcified discs were found in 75.9% of the longhaired miniature dachshunds and in 86.7% of the wirehaired ones. The occurrence of signs associated with IDD was 16.5% in longhaired and 15.6% in wirehaired miniature dachshunds. The occurrence of signs of IDD in dogs with calcified discs was 20.0% and 17.9% in longhaired and wirehaired miniature dachshunds, respectively. In dogs without calcifications only one dog showed signs of IDD. The curvature of the radius and the ulna did not differ between the dogs with signs of IDD and the healthy ones, or between the dogs with and without intervertebral calcifications. Our results indicate that radiographic eradication based on the presence of intervertebral calcifications is not suitable for breeding purposes for the Finnish miniature dachshund population because the percentage of dogs without calcifications is small.  相似文献   

Thermography and ultrasonography in back pain diagnosis of equine athletes   总被引：1，自引：0，他引：1  

B.P.A. Fonseca MS  A.L.G. Alves PhD  J.L.M. Nicoletti PhD  A. Thomassian PhD  C.A. Hussni PhD  S. Mikail DVM 《Journal of Equine Veterinary Science》2006,26(11):507-516

The object of the current study was to evaluate the efficacy of thermography and ultrasonography in the diagnosis of thoracolumbar lesions in Quarter Horse athletes and associate the different types of lesions found with the athletic modality practiced. Twenty-four horses were admitted to the Surgery Service for Large Animals of the Veterinary and Animal Science Faculty, UNESP, Botucatu, Brazil, with complaints of back problems. All the horses were submitted for physical examinations to confirm the existence of thoracolumbar alterations and then for thermography and ultrasonography. Thermography was used to map the lesioned areas of this region and ultrasonography for lesion characterization. The lesions found were supraspinous desmitis, interspinous desmitis, dorsal intervertebral osteoarthritis, and impingement of the spinous processes or kissing spines. The existence of a relation between the type of event practiced by the horse and the type of lesion found was determined. In horses that competed in the barrel race, a predominance of lesions in the thoracic caudal, thoracolumbar, and cranial lumbar regions occurred, with intervertebral osteoarthritis and interspinous desmitis being the most common. In cutting horses, most of the lesions were observed in the caudal lumbar region, whereas horses competing in reining showed a preferential location for lesions in the middle lumbar, with a predominance of supraspinous desmitis and myositis. Thermography associated with ultrasonography was shown to be efficient in the diagnosis of the thoracolumbar lesions of these horses.  相似文献   

一种用C18柱纯化低浓度微量寡核苷酸的新方法     

赵松子  沈向群  漆小泉 《江西农业学报》2009,21(7):9-11

通过比较4种不同的回收方法和C18硅胶4种不同的用量对回收的影响,提出了回收低浓度微量寡核苷酸的最佳方案:分别用1 mL乙腈、2 mL灭菌双蒸水和1 mL 10 mmol/L乙酸铵平衡装填10 mg硅胶的C18 Sep-Pak反相层析柱;再将寡核苷酸溶液通过C18柱;然后用1 mL 25 mmol/L碳酸氢铵洗脱C18柱,并以3000 r/m in离心2 m in;最后用1 mL 30%乙腈洗脱C18柱,将收集的溶液离心冻干后即得到纯化的寡核苷酸。该方法的回收率可达53.7%±3.0%。  相似文献   

高校学报栏目设置的探讨     

周逸辛 《安徽农业大学学报》2004,(2):138-140

本文阐述了高校学报栏目的概念、特征、作用及其划分的方法，讨论了学报栏目编排时应注意的几个问题。  相似文献   

DNA recovery from agarose gels with a simple centrifuge-driven sephadex filtration     

Niu Chen Li Yun 《中国林学(英文版)》2006,8(1):32-34

Conventional methods of DNA recovery from agarose gel generally require expensive equipment, extended elution times, or considerable handling of the sample after elution. We developed a simple protocol for a quick and effective recovery of DNA from agarose gels with good yield and quality. Using a Sephadex resin filled spin column, DNA fragments of 500 bp to 6 kb in an agarose gel slice were easily recovered by a 2 min centrifugation. The recovery efficiencies were over 40%-50% and the eluted DNA can be used directly for downstream application, such as polymerase chain reactions (PCR) and restriction enzyme digestion. This method could also be used to recover large DNA fragment (48 kb) without degradation. The use of Sephadex helps to remove small molecular impurities from agarose and it also reduces the chance of clogging the column filter caused by direct contact with agarose.  相似文献   

Prediction of the buckling stress of intermediate wooden columns using the secant modulus     

Hiroshi Yoshihara  Masamitsu Ohta  Yoshitaka Kubojima 《Journal of Wood Science》1998,44(1):69-72

We made several buckling tests of wooden columns with intermediate slenderness ratios () and examined the empirical formulas. On the basis of the examination, we formulated an equation for predicting the buckling stress () of an intermediate wooden column. Sitka spruce (Picea sitchensis Carr.) and buna (Japanese beech, Fagus crenata BI.) were used for the studies. A compressive load was applied on the specimen supported with pin ends, and the buckling stress was predicted by the tangent modulus theory and two empirical equations: those of Tetmajer and Newlin-Gahagan. The predicted - relations were compared with the test results, and the applicability of these predictions were examined. Based on the comparisons, we formulated an equation that can predict the - relations of materials with various stress-strain characters in the plastic strain range.  相似文献   

Development of wooden portal frame structures with improved columns     

Masahiro Noguchi  Shinjiro Takino  Kohei Komatsu 《Journal of Wood Science》2006,52(1):51-57

In Japan, the lifetime cycle of most housing lasts around 20–30 years. A governing factor in this respect is poor durability due to old-fashioned use of the house. As a solution of this problem, houses can be built with a skeleton structure that allows free partition of spaces by future owners. To develop the skeleton structure effectively, multistory frames with spans of 6 to 10 m are required. For this reason, attention has been focused on the behavior of multistory timber frame structures. In this article, two types of wooden portal frame structures are proposed. Both structures have improved vertical columns with short horizontal members glued in. The aim of this study was to investigate structurally effective solutions with these types of columns. The first type of the new structure changed the location of the moment-transmitting ductile connection with the improved columns. The second type of structure used an extended panel zone. Nine portal frame specimens were tested. The stiffness values were improved by around 1.7 and 3.5 times when compared with the control, and the strength was improved by around 1.25 and 1.45 times.  相似文献   

柱层析法纯化落叶松木材中的阿拉伯半乳聚糖     

黄占华  方桂珍 《林产化学与工业》2005,25(10):125-128

分别采用大孔吸附树脂柱层析和聚酰胺柱层析技术纯化兴安落叶松中的阿拉伯半乳聚糖，研究了两种层析柱洗脱过程中的杂质含量、糖含量随时间变化的情况，对比分析了它们对阿拉伯半乳聚糖的纯化效果。结果表明，经大孔树脂层析柱纯化后的阿拉伯半乳聚糖产品得率为68．28％，糖含量为95．02％；经聚酰胺层析柱纯化后的产品得率为75．67％，糖含量为98．30％。综合产品得率、糖含量以及成本等多方面因素，选择直接用聚酰胺层析柱来纯化阿拉伯半乳聚糖较为合适。  相似文献