全文获取类型
| 收费全文 | 173篇 |
| 免费 | 7篇 |
专业分类
| 林业 | 1篇 |
| 1篇 | |
| 综合类 | 26篇 |
| 农作物 | 3篇 |
| 畜牧兽医 | 147篇 |
| 园艺 | 1篇 |
| 植物保护 | 1篇 |
出版年
| 2023年 | 2篇 |
| 2021年 | 1篇 |
| 2020年 | 3篇 |
| 2019年 | 1篇 |
| 2017年 | 2篇 |
| 2016年 | 1篇 |
| 2015年 | 1篇 |
| 2014年 | 2篇 |
| 2013年 | 3篇 |
| 2012年 | 4篇 |
| 2010年 | 1篇 |
| 2009年 | 2篇 |
| 2008年 | 3篇 |
| 2007年 | 8篇 |
| 2006年 | 1篇 |
| 2005年 | 2篇 |
| 2004年 | 5篇 |
| 2003年 | 2篇 |
| 2002年 | 7篇 |
| 2001年 | 4篇 |
| 2000年 | 4篇 |
| 1999年 | 9篇 |
| 1998年 | 16篇 |
| 1997年 | 17篇 |
| 1996年 | 15篇 |
| 1995年 | 9篇 |
| 1994年 | 6篇 |
| 1993年 | 7篇 |
| 1992年 | 6篇 |
| 1991年 | 8篇 |
| 1990年 | 10篇 |
| 1989年 | 11篇 |
| 1988年 | 5篇 |
| 1984年 | 1篇 |
| 1976年 | 1篇 |
排序方式： 共有180条查询结果，搜索用时 125 毫秒
21.
22.
23.
24.
25.
Summary Various cardiorespiratory and metabolic indices were assessed during treadmill exercise in Thoroughbred and Standardbred racehorses with T wave changes in 4 or more leads on the electrocardiogram or second-degree atrio-ventricular (AV) block, and in horses that had no abnormalities on clinical examination, resting electrocardiography or upper respiratory tract endoscopy. No significant differences in heart rate, plasma lactate concentration, arterial blood gases, oxygen uptake, run time, peak velocity, or blood and red cell volumes were found between normal horses and horses with T wave changes or second-degree AV block. These results indicate that some electrocardiographic findings that are considered by some clinicians to indicate cardiac dysfunction, may have little effect on exercise capacity. 相似文献
26.
27.
28.
29.
30.
Melissa Cordero Dianne McFarlane Melanie A. Breshears Lisa M. Miller Margaret A. Miller Wendy M. Duckett 《Journal of Equine Veterinary Science》2012
The objective of this study was to determine the effect of season on the histologic and histomorphometric appearance of the normal equine pituitary gland. Pituitary glands were collected at necropsy from 121 horses throughout the year. Plasma was also collected from 59 of these horses before euthanasia. Hematoxylin and eosin stained median sagittal sections of each pituitary were evaluated and histologically graded by three pathologists. Histomorphometric analysis was performed on the same slides. Plasma α-melanocyte stimulating hormone was measured by radioimmunoassay in a subset of horses (n = 59). A total of 118 pituitary glands were included in the study after exclusions were made on the basis of the presence of pars intermedia (PI) adenomas (>5 mm). There was a positive correlation between PI hormone concentration (α-melanocyte stimulating hormone) and PI area. Pituitary gland measurements and grades from samples collected in the fall were compared with those collected in the nonfall months using t-test. The PI area, total pituitary area, and PI/total pituitary ratio were significantly greater in the fall compared with nonfall months (P < .0001, P < .01, P < .0001, respectively). Pituitary grades were also higher in the fall compared with nonfall months (P < .001). There was no seasonal difference in pars distalis or pars nervosa area. The results of this study show that the normal equine pituitary shows seasonal changes in appearance and size. These changes must be considered when using postmortem histologic evaluations in the diagnosis of pituitary pars intermedia dysfunction or for validation of antemortem diagnostic tests. 相似文献