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排序方式: 共有96条查询结果,搜索用时 281 毫秒
1.
Maria Clia Ramos Bellenzani PhD Associate Professor Júlia Maria D'andrea Greve PhD Professor-Physiatrics Csar Augusto Martins Pereira 《Journal of Equine Veterinary Science》2007,27(11):475-480
Horseshoeing is a common practice, but effects on the hoof wall are poorly understood. Strain gauges were used to document and compare hoof behavior in vitro during flat weight bearing and after artificial heel elevation. Ten front limbs of Thoroughbred race horses, shod with conventional flat shoes, were used. Eight strain gauges were symmetrically distributed around the toe, quarters, and heels. Each limb was mounted to a testing machine (Kratos K5002; Kratos Dynamômetros, Ltda., Cotia-SP-Brazil) and subjected to a load equivalent to 30% of the donor's body weight. Strains (μ) were acquired by means of a computerized system and the results compared using Friedman and Wilcoxon statistical tests. There was greater strain variation when the heels were elevated. Compression predominated during flat weight bearing, with a tendency to horizontal traction after heel elevation. The changes in strain caused by heel elevation were not always symmetrical. Elevation of the heels tensed the toe and the medial quarter horizontally, increased load at the posterior portion of the hoof capsule, and hindered its expansion. 相似文献
2.
东北亚四国(地区)SMV株系毒力比较 总被引:1,自引:0,他引:1
将我国,韩国,日本及俄罗斯远东地区的SMV株系与鉴别寄主交互接种测定其毒力。结果指出采用外国的株系鉴别寄坟难以区分我国株系毒力。同样,用我国鉴别寄坟也难以区分外国毒株的毒力,所测定的我国9个株系的13个代表毒株全部能侵染最抗病的鉴别寄主韩国的Buffalo和日本的Harojoy。 相似文献
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中国水稻白叶枯病菌系染色体DNA的RFLP谱型的初析 总被引:5,自引:0,他引:5
用2个DNA探针pJEL101和pBASavrXa10对78个水稻白叶枯病菌系进行RFLP分型,以分析其群体结构和遗传多样性。分别鉴定出16种RFLP标记带的谱型。以彼此的带位相似率达85%为界,可分为簇。参试菌系的群体遗传多样性为0.77(用pJEL101),和0.83RFLP谱型分析表明:我国多数病原型为杂合组群。白叶枯病菌系的分子表现型的变异,远远大于致病型,两个探针都能有效分析我国菌系的群 相似文献
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几个常规水稻新品系产量比较研究 总被引:1,自引:0,他引:1
以辽宁省盐碱地利用研究所优势育种室最新育成的30份水稻新品系为试验材料,选用辽宁省目前主栽水稻品种辽粳9号和盐丰47为对照进行了产量比较试验。结果表明:参试的30个水稻材料中,有10个品系产量表现比较突出,其中P8、P10、P11、P9、P13和P25性状表现更加突出。建议表现优良的品系参加升级试验,优良性状结构可作为选种参考。 相似文献
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《Plant Production Science》2013,16(3):368-376
Two separate experiments (pot and field) were conducted to examine the response of soybean to Bradyrhizobium japonicum and phosphorus (P) fertilization. Different treatments were i) Rhizobium strains (0, S377, S379, and the mixture of S377 + S379 i.e. S0, S1, S2, S3); ii) phosphorus (field only, 0, 50, 100 kg ha-1i.e. T0, T1, T2) and iii) two soils (pot only) i.e. autoclaved (A1) and non-autoclaved (A0). A soybean cultivar NARC-1 was tested for estimating growth traits, nodule number and mass, root development and yield traits. In the pot experiment, total number of nodules both in the A0 and A1 were negligible but increased significantly following the application of Bradyrhizobium japonicum. In the field experiment, number of nodules increased from 6 in the control treatment without strains to a maximum of 86 in S3T1. Shoot dry weight increased significantly from 11.8 g plant-1 in the control soil to 15.6 g plant-1 in S3T1. Root length was increased but root mass was unaffected. Soybean seed yields ranged between 615 and 1003 kg ha-1 against 543 kg ha-1 in the control soil indicating a maximum of 85% increase over control. Shoot dry weight and seed yield had significant correlation with nodulation (R2 = 0.91). The results of experiments revealed significant positive effects of rhizobium inoculation and P fertilization on growth, nodulation and yield of soybean and, generally, mixture of strains (S3) was more effective than the strains S1 and S2. Results also indicated that high application of P (100 kg P2O5 ha-1) reduced the efficiency of inoculants for nodule mass and seed yield. 相似文献
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