全文获取类型
收费全文 | 1046篇 |
免费 | 51篇 |
国内免费 | 2篇 |
专业分类
林业 | 50篇 |
农学 | 13篇 |
基础科学 | 7篇 |
154篇 | |
综合类 | 158篇 |
农作物 | 58篇 |
水产渔业 | 50篇 |
畜牧兽医 | 554篇 |
园艺 | 27篇 |
植物保护 | 28篇 |
出版年
2022年 | 9篇 |
2021年 | 15篇 |
2020年 | 15篇 |
2019年 | 11篇 |
2018年 | 14篇 |
2017年 | 18篇 |
2016年 | 16篇 |
2015年 | 17篇 |
2014年 | 21篇 |
2013年 | 26篇 |
2012年 | 31篇 |
2011年 | 51篇 |
2010年 | 32篇 |
2009年 | 23篇 |
2008年 | 46篇 |
2007年 | 49篇 |
2006年 | 42篇 |
2005年 | 32篇 |
2004年 | 33篇 |
2003年 | 27篇 |
2002年 | 25篇 |
2001年 | 16篇 |
2000年 | 17篇 |
1999年 | 20篇 |
1998年 | 10篇 |
1997年 | 12篇 |
1996年 | 13篇 |
1995年 | 9篇 |
1993年 | 13篇 |
1992年 | 19篇 |
1991年 | 23篇 |
1990年 | 28篇 |
1989年 | 22篇 |
1988年 | 13篇 |
1987年 | 12篇 |
1986年 | 20篇 |
1985年 | 18篇 |
1984年 | 11篇 |
1983年 | 15篇 |
1982年 | 12篇 |
1979年 | 10篇 |
1975年 | 11篇 |
1973年 | 12篇 |
1972年 | 17篇 |
1971年 | 9篇 |
1970年 | 27篇 |
1969年 | 15篇 |
1968年 | 9篇 |
1967年 | 11篇 |
1966年 | 9篇 |
排序方式: 共有1099条查询结果,搜索用时 0 毫秒
101.
102.
Ovine platelets suspended in homologous plasma aggregated effectively in response to adenosine-diphosphate, acid-soluble collagen and aggregated moderately to serotonin and arachidonic acid. Ovine platelet aggregation, in response to each agent, was inhibited in a concentration dependent fashion by T-2 toxin. The platelet aggregates which formed in the presence of T-2 toxin appeared to be less stable than aggregates in comparable control platelet suspensions. 相似文献
103.
104.
105.
Simulation technology will feature prominently in this exciting, yet challenging, time for veterinary medicine. The profession is evolving to keep pace with rapid changes in clinical practice, scientific discovery, and educational strategy, while ensuring that it follows the public mandate to produce competent veterinarians. Among the challenges to meeting this educational goal are limitations-due to important issues such as animal welfare-on the availability of real patients for training. Drawing chiefly on the experience in human medicine, this article explores the use of simulations in veterinary medical education to provide safe and ethical alternative opportunities for learners to practice essential clinical and professional skills. 相似文献
106.
107.
Smith MA Walmsley JP Phillips TJ Pinchbeck GL Booth TM Greet TR Richardson DW Ross MW Schramme MC Singer ER Smith RK Clegg PD 《Equine veterinary journal》2005,37(2):175-180
REASONS FOR PERFORMING STUDY: Subchondral cystic lesions of the medial femoral condyle (SCMFC) are well documented in horses < or =3 years; arthroscopic debridement or enucleation of the cyst is currently the surgical treatment of choice. However, studies of occurence and outcome following surgery in older horses are lacking. OBJECTIVE: To identify factors important in outcome for horses with SCMFC treated by arthroscopic debridement. HYPOTHESIS: Age of horse at presentation has a significant influence on return to work following arthroscopic treatment for SCMFC. Clinical and diagnostic findings are also significant with respect to prognosis. METHODS: A retrospective review of medical records from 6 equine referral centres identified 85 horses that underwent arthroscopic debridement of SCMFC. Clinical examination, radiographic and arthroscopic findings were analysed together with follow-up data. Univariable analysis and multivariable logistic regression models were used to determine factors affecting return to soundness. Event-time analysis was performed to evaluate return to work. RESULTS: Older horses (>3 years) were less likely to return to soundness (P = 0.02) or to work (P = 0.04) than younger horses (< or = 3 years). Of 39 horses age 0-3 years, 25 (64%, 95% CI 49-79%) returned to soundness. Of 46 horses age >3 years, 16 (35%,95% CI 21-49%) returned to soundness. In addition, cartilage damage at sites other than the SCMFC negatively affected prognosis (P = 0.05). The hospital where treatment was performed had no influence on return to soundness. CONCLUSIONS: Older horses carry a worse prognosis for both return to soundness and return to work. Potential relevance: It is important for clients to be made aware of the difference in outcome between age groups. 相似文献
108.
109.
G E Ross 《Journal of the American Veterinary Medical Association》1968,153(12):1759-1765
110.