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排序方式: 共有96条查询结果,搜索用时 343 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
3.
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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《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
9.
犬瘟热,猫细小病毒,犬腺病毒弱毒株的理化特性及生物学试验 总被引:4,自引:2,他引:2
以鸡胚成纤维细胞(CEF)、猫肾传代细胞(CRFK)、狗肾传代细胞(MDCK)从引进的疫苗中分别分离到犬瘟热CDV-A株、猫细小病毒FPV株、犬腺病毒CAV1株。对三个弱毒株的细胞病变规律,形态特征,病毒滴度,理化特性,核酸型,血清学交叉反应,本动物的安全性及免疫原性等内容进行了试验。鉴定结果表明,3个弱毒株均可作为制苗用毒种 相似文献
10.
用划线分离的方法从天然胶乳中分离出106株细菌,再从中初筛出16株产酸菌,并通过不同产酸菌对天然胶乳凝固效果复筛实验,最终筛选出3株凝固效果较好的菌种,分别命名为NRC1、NRC2与NRC3。实验结果表明:此3株菌都能有效缩短天然胶乳的凝固时间,并且在凝固过程中具有臭味小,发胀不明显等特d点;单菌种微生物凝固NR和酸凝固NR的性能对比,具有快速塑性值较大,塑性保持率稍低,拉伸性能好等特点。测定3株细菌的16SrDNA序列,并对其进行分子鉴定。结果表明:NRC1与NRC3为克雷伯氏菌属(Klebsiella),NRC2为变形杆菌属(Proteus),均属于肠杆菌科。 相似文献