全文获取类型
| 收费全文 | 147篇 |
| 免费 | 11篇 |
专业分类
| 林业 | 7篇 |
| 农学 | 1篇 |
| 综合类 | 17篇 |
| 农作物 | 4篇 |
| 水产渔业 | 4篇 |
| 畜牧兽医 | 119篇 |
| 园艺 | 1篇 |
| 植物保护 | 5篇 |
出版年
| 2023年 | 2篇 |
| 2020年 | 2篇 |
| 2019年 | 2篇 |
| 2018年 | 3篇 |
| 2017年 | 4篇 |
| 2016年 | 1篇 |
| 2015年 | 2篇 |
| 2014年 | 2篇 |
| 2013年 | 10篇 |
| 2012年 | 3篇 |
| 2011年 | 1篇 |
| 2010年 | 5篇 |
| 2009年 | 6篇 |
| 2008年 | 1篇 |
| 2007年 | 7篇 |
| 2006年 | 9篇 |
| 2005年 | 5篇 |
| 2003年 | 7篇 |
| 2002年 | 1篇 |
| 2001年 | 5篇 |
| 2000年 | 1篇 |
| 1999年 | 6篇 |
| 1998年 | 4篇 |
| 1997年 | 14篇 |
| 1996年 | 2篇 |
| 1995年 | 5篇 |
| 1994年 | 5篇 |
| 1993年 | 4篇 |
| 1992年 | 9篇 |
| 1991年 | 4篇 |
| 1989年 | 6篇 |
| 1988年 | 2篇 |
| 1987年 | 3篇 |
| 1984年 | 3篇 |
| 1983年 | 2篇 |
| 1979年 | 1篇 |
| 1978年 | 1篇 |
| 1976年 | 1篇 |
| 1975年 | 1篇 |
| 1972年 | 1篇 |
| 1966年 | 2篇 |
| 1965年 | 2篇 |
| 1963年 | 1篇 |
排序方式： 共有158条查询结果，搜索用时 15 毫秒
101.
YASMINDA MALIK DVM DAVID SPRENG DVM Diplomate ECVS & ACVECC MARTIN KONAR DVM Diplomate ECVDI MARCUS G. DOHERR DVM PhD Diplomate ECVPH RE JAGGY PhD Diplomate ECVN JUDITH HOWARD DVM Diplomate ACVIM FRANCK FORTERRE DVM Diplomate ECVS 《Veterinary surgery : VS》2009,38(4):457-462
Objectives— (1) To assess spinal cord blood flow (SCBF) during surgical treatment of disk extrusion in dogs and (2) to investigate associations between SCBF, clinical signs, presurgical MRI images, and 24-hour surgical outcome.
Study Design— Cohort study.
Animals— Chondrodystrophic dogs with thoracolumbar disk extrusion (n=12).
Methods— Diagnosis was based on clinical signs and MRI findings, and confirmed at surgery. Regional SCBF was measured intraoperatively by laser-Doppler flowmetry before, immediately after surgical spinal cord decompression, and after 15 minutes of lavaging the lesion. Care was taken to ensure a standardized surgical procedure to minimize factors that could influence measurement readings.
Results— A significant increase in intraoperative SCBF was found in all dogs (Wilcoxon's signed-rank test; P =.05) immediately after spinal cord decompression and after 15 minutes. Changes in SCBF were not associated with duration of clinical signs; initial or 24-hour neurologic status; or degree of spinal cord compression assessed by MRI.
Conclusion— SCBF increases immediately after spinal cord decompression in dogs with disk herniation; however, increased SCBF was not associated with a diminished 24-hour neurologic status.
Clinical Relevance— An increase in SCBF does not appear to be either associated with the degree of spinal cord compression or of a magnitude sufficient to outweigh the benefit of surgical decompression by resulting in clinically relevant changes in 24-hour outcome. 相似文献
Study Design— Cohort study.
Animals— Chondrodystrophic dogs with thoracolumbar disk extrusion (n=12).
Methods— Diagnosis was based on clinical signs and MRI findings, and confirmed at surgery. Regional SCBF was measured intraoperatively by laser-Doppler flowmetry before, immediately after surgical spinal cord decompression, and after 15 minutes of lavaging the lesion. Care was taken to ensure a standardized surgical procedure to minimize factors that could influence measurement readings.
Results— A significant increase in intraoperative SCBF was found in all dogs (Wilcoxon's signed-rank test; P =.05) immediately after spinal cord decompression and after 15 minutes. Changes in SCBF were not associated with duration of clinical signs; initial or 24-hour neurologic status; or degree of spinal cord compression assessed by MRI.
Conclusion— SCBF increases immediately after spinal cord decompression in dogs with disk herniation; however, increased SCBF was not associated with a diminished 24-hour neurologic status.
Clinical Relevance— An increase in SCBF does not appear to be either associated with the degree of spinal cord compression or of a magnitude sufficient to outweigh the benefit of surgical decompression by resulting in clinically relevant changes in 24-hour outcome. 相似文献
102.
【目的】提高克拉玛依果树腐烂病生物防治的效率,为相关果树高效生物防治提供科学依据和物质基础。【方法】从克拉玛依林杨的苹果树和李子树腐烂病发病植株及周边采集病灶和土壤样品,分析病原菌及其拮抗菌的筛选及微生物分子鉴定及拮抗效果。【结果】苹果树和李子树腐烂病病原菌均黑腐皮壳菌属（Valsa）,其中李子树病原菌涉及该属的两个种：Valsa mali 和Valsa leucostoma ,而苹果树病原菌仅为Valsa mali。同时获得各类真菌拮抗菌15株,涉及4个属9个种,筛选到具有高效拮抗细菌2株,其最大抑菌圈菌落比分别达到2-11和2-79。【结论】菌株芽孢杆菌B4和B6对果树腐烂病具有较好的抑菌效果,研究报道了李子树腐烂病病原菌,为相关果树的高效生物防治提供了科学依据和物质基础。 相似文献
103.
104.
105.
Diversity and assembly of weed communities: contrasting responses across cropping systems 总被引：2，自引：0，他引：2
Diversity and weed community composition of mid-season plant stands and autumn seedbanks were examined in spring barley–red clover cropping systems that varied according to crop rotation, tillage and weed management. Weed plant and seed density data collected over 4 years were used in the calculation of species richness (number of species), evenness (Shannon's E) and diversity (Shannon's H′), and in multivariate analysis (canonical discriminant analysis) of weed communities. Weed diversity indices were low (H′ < 2.0) but sensitive to management practices. Evenness had intermediate values (E = 0.4–0.8), suggesting little evidence of truly dominant species, particularly in the seedbanks. The difference in the number of species between treatments was never large (approximately two to four species). Overall, diversity indices were highest in the low disturbance treatments, particularly those with minimum weed management. Factors affecting ordination were somewhat different from those affecting diversity. Tillage had little effect on weed diversity indices but had a more major role in determining weed community composition. Seedbanks in no-till and monoculture-chisel plough treatments appeared to have more distinctive species composition compared with other treatments. Weed species assembly in seedbanks showed little discrimination across treatments and over time, confirming the ability of seedbanks to buffer disturbances across a variety of cropping systems. The use of diversity indices revealed part of the complexity of weed communities associated with disturbance in cropping systems, whereas ordination singled out species–cropping systems associations, which may be more meaningful to weed management. 相似文献
106.
107.
108.
109.
110.