全文获取类型
收费全文 | 710篇 |
免费 | 43篇 |
专业分类
林业 | 11篇 |
农学 | 16篇 |
基础科学 | 2篇 |
85篇 | |
综合类 | 120篇 |
农作物 | 10篇 |
水产渔业 | 15篇 |
畜牧兽医 | 459篇 |
园艺 | 7篇 |
植物保护 | 28篇 |
出版年
2020年 | 6篇 |
2019年 | 7篇 |
2018年 | 8篇 |
2017年 | 11篇 |
2016年 | 16篇 |
2015年 | 12篇 |
2014年 | 8篇 |
2013年 | 40篇 |
2012年 | 27篇 |
2011年 | 47篇 |
2010年 | 17篇 |
2009年 | 6篇 |
2008年 | 31篇 |
2007年 | 38篇 |
2006年 | 21篇 |
2005年 | 22篇 |
2004年 | 29篇 |
2003年 | 17篇 |
2002年 | 22篇 |
2001年 | 20篇 |
2000年 | 24篇 |
1999年 | 14篇 |
1998年 | 12篇 |
1997年 | 10篇 |
1996年 | 6篇 |
1995年 | 7篇 |
1994年 | 5篇 |
1993年 | 6篇 |
1992年 | 12篇 |
1991年 | 10篇 |
1990年 | 21篇 |
1989年 | 19篇 |
1988年 | 19篇 |
1987年 | 14篇 |
1986年 | 16篇 |
1985年 | 9篇 |
1984年 | 12篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 9篇 |
1977年 | 4篇 |
1975年 | 7篇 |
1974年 | 4篇 |
1973年 | 10篇 |
1971年 | 9篇 |
1970年 | 10篇 |
1969年 | 5篇 |
1968年 | 5篇 |
1967年 | 5篇 |
1966年 | 5篇 |
排序方式: 共有753条查询结果,搜索用时 78 毫秒
31.
Anti-erythrocytic immunoglobulins in serum and colostrum of 124 anaplasmosis-vaccinated cows were detected with a saline agglutination test. Positive results were correlated with the occurrence of neonatal isohemolytic anemia (NIA) in calves and were used to predict the occurrence of NIA. The disease was prevented by withholding colostrum from calves with a high potential for NIA. 相似文献
32.
33.
S S Newman A F Roy D G Luther J D Hoskins H U Cox M T Kearney 《American journal of veterinary research》1985,46(1):294-297
A commercial broth microdilution system for testing the antimicrobial susceptibility of gram-positive cocci was compared with the standardized disk agar-diffusion method by testing 254 clinical strains of staphylococci and streptococci using both methods. A total of 2,794 parallel determinations were made with 92.3% complete agreement between the 2 methods; of the discrepancies encountered, 3.0% were minor, 2.5% were major, and 2.1% were very major. The results indicate that the commercial microdilution system may provide a reliable quantitative method for antimicrobial susceptibility testing of clinical isolates from animals. 相似文献
34.
35.
Biological activity of Glechoma hederacea 总被引:2,自引:0,他引:2
The n-hexane, dichloromethane and methanol extracts of the aerial parts of Glechoma hederacea have been screened for antibacterial and free radical scavenging activity. General toxicity (brine shrimp lethality assay) of these extracts has also been assessed. 相似文献
36.
The level of indole-3-acetic acid (IAA) in shortleaf pine (Pinus echinata Mill.) roots was increased by inoculation with the ectomycorrhizal fungus Pisolithus tinctorius (Pers.) Coker and Couch. Indole-3-acetic acid oxidase activity was also increased suggesting that the increased level of IAA was the result of increased synthesis. Boron fertilization reduced IAA levels in roots inoculated with P. tinctorius but not in noninoculated roots. 相似文献
37.
38.
39.
40.