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   327篇
  免费   21篇
林业   5篇
农学   2篇
  19篇
综合类   66篇
农作物   5篇
水产渔业   8篇
畜牧兽医   225篇
园艺   3篇
植物保护   15篇
  2021年   4篇
  2020年   3篇
  2019年   3篇
  2018年   5篇
  2017年   5篇
  2016年   8篇
  2015年   7篇
  2014年   5篇
  2013年   19篇
  2012年   17篇
  2011年   18篇
  2010年   12篇
  2009年   8篇
  2008年   18篇
  2007年   5篇
  2006年   6篇
  2005年   17篇
  2004年   5篇
  2003年   9篇
  2002年   6篇
  2001年   10篇
  2000年   9篇
  1999年   4篇
  1998年   6篇
  1997年   10篇
  1996年   9篇
  1995年   4篇
  1993年   3篇
  1992年   12篇
  1991年   12篇
  1990年   4篇
  1989年   11篇
  1988年   3篇
  1987年   3篇
  1986年   9篇
  1985年   11篇
  1984年   5篇
  1983年   3篇
  1982年   4篇
  1981年   5篇
  1979年   3篇
  1978年   2篇
  1977年   3篇
  1974年   2篇
  1972年   2篇
  1969年   3篇
  1968年   3篇
  1967年   2篇
  1935年   1篇
  1926年   1篇
排序方式: 共有348条查询结果,搜索用时 15 毫秒
211.
212.
A dispute between university-based researchers and the corporation that funded their study is threatening to erupt into a $7 million to $10 million legal battle. Last week, the researchers reported that a large clinical trial of an immune system booster to treat HIV-infected people found that the drug isn't effective in slowing progression to AIDS or reducing mortality. The company that developed the drug tried to block publication of the study unless the researchers included the company's analysis of a subset of the data that suggests the drug might help some people. The researchers refused.  相似文献   
213.
Four out of five monkeys showed no lessening of the ability to perform a motor habit requiring concurrent movement of the two hands in opposite directions when the callosum was cut after training. However, in only one animal was there significant transfer, between the hands, of a shape-discrimination habit learned postoperatively.  相似文献   
214.
215.
216.
217.
218.
The developing embryo/fetus bears antigens which are foreign to the mother and it could be expected that immune rejection of the conceptus would occur. One of the reasons why the fetus is not rejected is because a depression of the maternal immune response takes place during pregnancy. Serum from pregnant animals of several species has been shown to contain a factor, early pregnancy factor (EPF), which is immunosuppressive. EPF has been detected as early as six hours after mating and its detection could aid diagnosis of early pregnancy in all species.  相似文献   
219.
Objective   Describe the use of a phalangeal cast as treatment for wounds in the pastern and foot region of horses. Secondly, to evaluate the healing and soundness of horses treated with phalangeal casts.
Design   Retrospective study of 49 horses.
Procedures   Medical records of 49 horses that were treated with a phalangeal cast for 50 cases of wounds in the pastern and foot region at equine referral hospitals from 1995 to 2006 were reviewed and follow-up information was obtained.
Results   Treatment consisted of wound debridement, lavage, wound closure (28 wounds), cast application and antibiotics (84%). At follow-up, the majority of horses were sound (42 of 47 wounds, 89.4%), three horses were still lame and one horse was euthanased because of persistent lameness. Three horses were lost to follow-up. There was no statistical difference between the outcomes of horses treated acutely (<24 h) or after a 24-h delay. Similarly, the involvement of synovial structures in the wound did not significantly influence outcome.
Conclusions   In this study, wounds involving the pastern and foot that were treated with a phalangeal cast carried a good prognosis for soundness (89.4%) and cosmetic healing (89.5%). The phalangeal casts were well-tolerated and effective.  相似文献   
220.
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