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   455篇
  免费   21篇
林业   6篇
农学   2篇
  35篇
综合类   40篇
农作物   49篇
水产渔业   29篇
畜牧兽医   296篇
园艺   4篇
植物保护   15篇
  2021年   5篇
  2020年   8篇
  2019年   11篇
  2018年   12篇
  2017年   5篇
  2016年   4篇
  2015年   9篇
  2014年   6篇
  2013年   19篇
  2012年   22篇
  2011年   27篇
  2010年   13篇
  2009年   14篇
  2008年   18篇
  2007年   15篇
  2006年   23篇
  2005年   21篇
  2004年   13篇
  2003年   17篇
  2002年   13篇
  2001年   20篇
  2000年   12篇
  1999年   9篇
  1997年   3篇
  1996年   5篇
  1995年   3篇
  1992年   9篇
  1991年   5篇
  1990年   15篇
  1989年   8篇
  1988年   6篇
  1987年   12篇
  1986年   7篇
  1985年   6篇
  1983年   3篇
  1981年   2篇
  1980年   2篇
  1979年   4篇
  1973年   2篇
  1972年   2篇
  1971年   4篇
  1970年   4篇
  1969年   3篇
  1966年   2篇
  1947年   4篇
  1946年   8篇
  1945年   7篇
  1944年   6篇
  1943年   6篇
  1941年   3篇
排序方式: 共有476条查询结果,搜索用时 15 毫秒
431.
The use of the wick catheter to measure intracompartmental muscle pressure in equine muscle was documented. The presence of muscle compartments involving the extensor carpi radialis muscle and the long head of the triceps brachii was demonstrated by anatomic dissection and radiographic technique. The wick catheter was capable of accurately measuring pressures within both of these compartments. Furthermore, the wick catheter was sensitive to pressure changes resulting from external compression of muscle compartments. Manipulation of systemic blood pressure and PaCO2 in 1 anesthetized horse did not affect intracompartmental muscle pressure.  相似文献   
432.
H. Lindsay 《Potato Research》1973,16(3):176-179
Summary An improved rapid method for the colorimetric estimation of reducing sugars in potatoes with 3,5-dinitrosalicylic acid is described which is not subject to the drawbacks of the picric acid method.  相似文献   
433.
Neospora caninum infection was diagnosed in 5 young dogs from 2 litters with a common parentage. The pups were born healthy, but developed hind limb paresis 5 to 8 weeks after birth. The predominant lesions were polyradiculoneuritis and granulomatous polymyositis. Neospora caninum was seen microscopically in sections of naturally infected pups, and was isolated in cell cultures, mice, and dogs inoculated with infected canine tissues. Antibodies to N caninum were detected in sera of infected dogs by indirect fluorescent antibody test.  相似文献   
434.
Oocysts of Isospora suis were not found in any of 77 fecal samples from sows on farms with a history of neonatal coccidiosis. Oocysts of Isospora suis were found in 1 of 172 fecal samples from farms without a history of neonatal coccidiosis. Oocysts of Eimeria spp were found in 81.8% of the sows from farms with a history of neonatal coccidiosis and in 94.8% of the sows from farms without a history of neonatal coccidiosis. Oocysts of Isospora spp from birds were encountered as a pseudoparasite in several fecal samples.  相似文献   
435.
436.
437.
438.
Chronic hypertrophic pyloric gastropathy in 14 dogs   总被引:1,自引:0,他引:1  
SUMMARY Ten mate and 4 female dogs with chronic hypertrophic pyloric gastropathy were seen at the Sydney University Veterinary Teaching Hospital in the period 1982–88. The most commonly affected breeds were the Shihtzu and Maltese. The mean age was 8.2 yr and the mean body weight 6.5 kg. The most common clinical signs were vomiting, weight loss, polydipsia and depression. Hypokalaemia was present in 11 of 12 dogs examined and hypochloraemia in 10 of 11 dogs examined. Five of the six dogs that had blood gases measured were found to have a metabolic alkalosis. Surgery was performed on 13 dogs; pyloromyotomy 7, pyloroplasty 4, gastroduodenostomy 2. There was a recurrence of symptoms in one pyloromyotomy dog, and fatal ulceration and perforation of the cardia occurred in one pyloroplasty case. The remaining 11 dogs had a mean known symptom-free survival time of 20 mo. This study confirms the preponderance of affected males, identifies electrolyte and blood gas disturbances as significant complications of chronic hypertrophic pyloric gastropathy, and suggests that relatively minor surgery (pyloromyotomy) may have a place in the treatment of a selected subgroup of cases.  相似文献   
439.
440.
Dogs may be infected by Mycobacterium (M.) tuberculosis, M. bovis, and M. avium complex, and the clinical signs associated with each of these infections may be indistinguishable. Rapid speciation of the infecting organism is desirable because of the public health concerns associated with M. bovis and M. tuberculosis infections. A mycobacterial infection was suspected in the dog of this report based on acid-fast staining of organisms in macrophages obtained from liver aspirates and buffy-coat preparations. Polymerase chain reaction (PCR) analysis of a buffy-coat preparation identified M. avium.  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