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   496篇
  免费   51篇
林业   14篇
农学   8篇
基础科学   2篇
  68篇
综合类   102篇
农作物   14篇
水产渔业   25篇
畜牧兽医   272篇
园艺   17篇
植物保护   25篇
  2020年   5篇
  2019年   7篇
  2018年   5篇
  2017年   9篇
  2016年   4篇
  2015年   5篇
  2014年   9篇
  2013年   26篇
  2012年   16篇
  2011年   20篇
  2010年   10篇
  2009年   14篇
  2008年   18篇
  2007年   14篇
  2006年   18篇
  2005年   12篇
  2004年   17篇
  2003年   14篇
  2002年   13篇
  2001年   18篇
  2000年   11篇
  1999年   11篇
  1998年   4篇
  1996年   8篇
  1995年   5篇
  1994年   4篇
  1993年   4篇
  1992年   9篇
  1991年   5篇
  1990年   12篇
  1989年   10篇
  1987年   8篇
  1986年   7篇
  1985年   13篇
  1984年   5篇
  1983年   12篇
  1982年   6篇
  1981年   6篇
  1980年   8篇
  1979年   8篇
  1976年   8篇
  1975年   8篇
  1974年   7篇
  1973年   9篇
  1972年   5篇
  1971年   10篇
  1967年   13篇
  1965年   5篇
  1963年   4篇
  1960年   5篇
排序方式: 共有547条查询结果,搜索用时 671 毫秒
61.
Veterinary science is well supplied with abstracting and indexing hournals. Both experience and an investigation undertaken for the Food and Agriculture Organisation indicate that they are comprehensive in scope and subject coverage. Computer operation of information services is now routine, and mechanised alerting and retrospective services are available. A veterinary round table was set up in 1973 by the Commission of the European Communities to attempt to improve veterinary information. The round table is conducting a detailed study of the value of the available machine information systems to veterinarians and is compiling a multi-lingual thesaurus. In addition, it is investigating the need for a new review journal, methods of recording animal disease incidence and variations in the needs of the different types of veterinarians for information. The use of machine information systems is expected to become more widespread in the near future. Many will be available on-line, a method of working which offers great advantages in speed and flexibility of operation.  相似文献   
62.
A mature, neutered male domestic cat was presented with a chronic axillary wound of unknown origin and at least three years' duration. The diagnostic investigation included screening tests for feline leukaemia virus and feline immunodeficiency virus, tissue culture and histological examination. No underlying aetiology or perpetuating cause could be identified. An omental flap was created, passed via a subcutaneous tunnel, and packed into the wound site after excision of all chronic granulation tissue. The skin defect was closed using an omocervical axial pattern skin flap. A small area of the distal edge of the flap became necrotic but the defect healed by second intention. To the author's knowledge, this is the first clinical report of the use of an omocervical skin flap for repair of a chronic axillary wound in a cat. This flap offers a useful alternative where the use of a thoracodorsal axial pattern flap is not possible due to the extent of the lesion.  相似文献   
63.
64.
65.
66.
67.
68.
This article reports on the coordination of communications skills training in veterinary schools in the United Kingdom and Ireland and describes the progress and status of training that is occurring in six of these schools.  相似文献   
69.
70.
Fairs and petting zoos have been associated with outbreaks of zoonotic disease. Previously, the presence of meticillin-resistant Staphylococcus aureus (MRSA) was documented in commercial pigs; therefore, it was hypothesised that antibiotic-resistant S aureus may also occur in pigs exhibited at agricultural fairs. To test this hypothesis, 157 pigs were swabbed at two state fairs in 2008 to 2009. Both nares were sampled and cultures were grown in enrichment broth, then plated onto selective MRSA plates and blood plates. S aureus was confirmed using phenotypic and molecular methods, and was analysed using spa typing, gene-specific polymerase chain reaction and antibiotic susceptibility testing. The presence of S aureus was confirmed in samples collected from pigs exhibited at USA pig shows. Twenty-five of 157 (15.9 per cent) samples were positive for S aureus. Two isolates (8 per cent) were resistant to meticillin; 23/25 (92 per cent), 14/25 (56 per cent) and 15/25 (60 per cent) were resistant to tetracycline, erythromycin and clindamycin, respectively. spa typing revealed multiple isolates of spa type t034 (9/25, 36 per cent) and t337 (7/25, 28 per cent) and singletons of t002, t209, t526, t1236, t1334, t1683, t3075, t5784 and t5883. These results verify the presence of antibiotic-resistant S aureus in pigs exhibited at USA fairs, suggesting that pigs are a potential reservoir for S aureus within this environment.  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