首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   115篇
  免费   13篇
林业   1篇
综合类   11篇
农作物   2篇
水产渔业   3篇
畜牧兽医   106篇
植物保护   5篇
  2023年   1篇
  2021年   1篇
  2019年   1篇
  2018年   2篇
  2017年   4篇
  2016年   6篇
  2015年   1篇
  2014年   8篇
  2013年   31篇
  2012年   1篇
  2011年   2篇
  2010年   11篇
  2009年   5篇
  2008年   1篇
  2007年   2篇
  2006年   3篇
  2005年   5篇
  2003年   1篇
  2002年   4篇
  2000年   2篇
  1999年   1篇
  1998年   8篇
  1997年   3篇
  1996年   3篇
  1995年   5篇
  1994年   1篇
  1993年   7篇
  1992年   1篇
  1991年   1篇
  1990年   2篇
  1987年   1篇
  1981年   1篇
  1977年   1篇
  1940年   1篇
排序方式: 共有128条查询结果,搜索用时 984 毫秒
1.
2.
3.
The aim of this study was to test the influence of post ‐ thaw storage time on the duration of sperm motility, percentage of motile sperm, and fertilization and hatching rates of fresh sperm and sperm stored for 0, 30 and 60 min at 4°C post‐thawing. After being frozen in liquid nitrogen and then thawed, the percentage of motile sperm and duration of motility were not affected by 30 min of storage at 4°C, whereas a significant decline in these parameters was observed after 60 min of storage. Similarly, fertilization and hatching rates were significantly affected within 60 min of storage at 4°C, and the fertility of frozen‐thawed sperm was significantly lower than that of fresh sperm. We conclude that cryopreserved sperm of beluga sturgeon could be stored for 30 min without the loss of sperm quality. This described procedure for beluga sturgeon cryopreservation is reliable and efficient and therefore can be recommended for hatchery practice after scaling up this technique.  相似文献   
4.
5.
Two cases of Rhodococcus equl infection in foals are described, in which osteomyelitis was a feature. Because rhodococcal infection is usually low grade and chronic, and because the signs of early metaphysitis can be subtle, any articular or periarticular swelling in a foal from a farm with a history of rhodococcosis should be strongly suspected to be associated with R equl until proven otherwise.  相似文献   
6.
Reply     
  相似文献   
7.
8.
9.
10.
CASE HISTORY: A mature male tuatara was presented with a history of recurrent cloacal prolapse.

CLINICAL AND PATHOLOGICAL FINDINGS: The prolapsed tissue included a 12 mm diameter mass, which histologically showed cords and nodules of neoplastic epithelial cells.

DIAGNOSIS: The mass was diagnosed as a squamous cell carcinoma with ulceration of the overlying stratified squamous epithelium and diffuse inflammation of the surrounding dermis.

CLINICAL RELEVANCE: This case presented a rare opportunity to investigate squamous cell carcinoma in a long-lived lower vertebrate species. Future recurrence or metastasis of the mass may add useful information to the current base of knowledge of the behaviour of malignant neoplasms in reptiles.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号