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   153207篇
  免费   7964篇
  国内免费   68篇
林业   9207篇
农学   5911篇
基础科学   1002篇
  21030篇
综合类   20184篇
农作物   7101篇
水产渔业   8889篇
畜牧兽医   74233篇
园艺   2750篇
植物保护   10932篇
  2020年   1194篇
  2019年   1442篇
  2018年   4927篇
  2017年   5200篇
  2016年   3469篇
  2015年   2083篇
  2014年   2490篇
  2013年   5763篇
  2012年   5187篇
  2011年   7430篇
  2010年   5774篇
  2009年   5057篇
  2008年   6646篇
  2007年   6863篇
  2006年   4684篇
  2005年   4384篇
  2004年   4227篇
  2003年   4363篇
  2002年   3896篇
  2001年   4781篇
  2000年   4691篇
  1999年   3749篇
  1998年   1471篇
  1997年   1452篇
  1996年   1341篇
  1995年   1600篇
  1994年   1329篇
  1993年   1377篇
  1992年   2790篇
  1991年   2902篇
  1990年   2867篇
  1989年   2913篇
  1988年   2621篇
  1987年   2593篇
  1986年   2539篇
  1985年   2400篇
  1984年   1956篇
  1983年   1716篇
  1982年   1156篇
  1979年   1649篇
  1978年   1284篇
  1977年   1147篇
  1976年   1100篇
  1975年   1164篇
  1974年   1357篇
  1973年   1448篇
  1972年   1379篇
  1971年   1197篇
  1970年   1247篇
  1969年   1148篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
The medical records of 38 horses with puncture wounds of the navicular bursa were reviewed. Only 12 horses had a satisfactory outcome (breeding or riding). Of the remaining 26 horses, 19 were euthanized, five were sold due to persistent severe lameness, one died, and one was lost to long-term follow-up. Different combinations of conservative management prior to surgical debridement and drainage of the navicular bursa were unsuccessful in resolving the condition. Horses that were treated surgically within 1 week of the injury and had a hind leg affected had the best chance of a satisfactory outcome. Additional wound debridement was necessary in 15 horses after initial surgical treatment. The most common complications encountered were navicular bone osteomyelitis and sepsis of the deep digital flexor tendon. Thirteen of 14 horses that had rupture of the deep digital flexor tendon and subluxation of the distal interphalangeal joint had an unsatisfactory outcome. One mare subsequently developed ankylosis of the distal interphalangeal joint and was a useful brood mare. Two horses that had biaxial palmar digital neurectomy because of persistent lameness were later euthanized because of navicular bone fracture and rupture of the deep digital flexor tendon. Results from limited numbers of bacterial cultures and antibiotic sensitivities suggest that penicillin and an aminoglycoside antibiotic should be used as initial antibiotic therapy. Immediate surgical debridement and appropriate antibiotic treatment are recommended as the minimum therapy for penetrating wounds of the navicular bursa in horses.  相似文献   
62.
Summary Acute febrile diseases are characterized by specific and non-specific symptoms. The non-specific responses are presented under the headings: fever, inflammation and pain, experimental models for investigating febrile reactions, haematologic changes, blood biochemical changes, cardiovascular effects, changes in gastric function, and the effects of fever upon pharmacokinetics of drugs. It was the purpose of this review to describe present concepts of thermoregulation and fever, the associated reactions produced by bacterial pyrogens and the mechanisms of these reactions. The available data illustrate, that many questions have not yet been clearly answered. However, the entire field of research involving endogenous substances, such as interleukin-1, is now moving ahead with great speed. Furthermore, there is some evidence which suggests that fever and the associated lower plasma zinc and iron levels act together as a co-ordinated non-specific host defence mechanism. Since experimental fever has a distinct effect upon the pharmacokinetics of drugs, more attention should be given to this aspect.  相似文献   
63.
64.
65.
66.
67.
68.
69.
70.
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