全文获取类型
收费全文 | 14815篇 |
免费 | 1206篇 |
国内免费 | 842篇 |
专业分类
林业 | 687篇 |
农学 | 1079篇 |
基础科学 | 145篇 |
440篇 | |
综合类 | 5015篇 |
农作物 | 901篇 |
水产渔业 | 894篇 |
畜牧兽医 | 4684篇 |
园艺 | 788篇 |
植物保护 | 2230篇 |
出版年
2024年 | 38篇 |
2023年 | 260篇 |
2022年 | 441篇 |
2021年 | 572篇 |
2020年 | 591篇 |
2019年 | 644篇 |
2018年 | 437篇 |
2017年 | 584篇 |
2016年 | 603篇 |
2015年 | 580篇 |
2014年 | 804篇 |
2013年 | 818篇 |
2012年 | 972篇 |
2011年 | 956篇 |
2010年 | 829篇 |
2009年 | 813篇 |
2008年 | 766篇 |
2007年 | 758篇 |
2006年 | 689篇 |
2005年 | 548篇 |
2004年 | 528篇 |
2003年 | 418篇 |
2002年 | 335篇 |
2001年 | 381篇 |
2000年 | 380篇 |
1999年 | 321篇 |
1998年 | 233篇 |
1997年 | 185篇 |
1996年 | 181篇 |
1995年 | 191篇 |
1994年 | 155篇 |
1993年 | 140篇 |
1992年 | 159篇 |
1991年 | 107篇 |
1990年 | 92篇 |
1989年 | 80篇 |
1988年 | 58篇 |
1987年 | 45篇 |
1986年 | 25篇 |
1985年 | 16篇 |
1984年 | 10篇 |
1983年 | 14篇 |
1982年 | 19篇 |
1981年 | 11篇 |
1980年 | 20篇 |
1979年 | 17篇 |
1978年 | 7篇 |
1976年 | 9篇 |
1956年 | 5篇 |
1955年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
M. Pruvot D. Seidel M.S. Boyce M. Musiani A. Massolo S. Kutz K. Orsel 《Preventive veterinary medicine》2014
In Southwest Alberta, beef cattle and wild elk (Cervus elaphus) have similar habitat preferences. Understanding their inter-species contact structure is important for assessing the risk of pathogen transmission between them. These spatio-temporal patterns of interactions are shaped, in part, by range management and environmental factors affecting elk distribution. In this study, resource selection modeling was used to identify factors influencing elk presence on cattle pasture and elk selection of foraging patches; furthermore, consequences for inter-species disease transmission were discussed. 相似文献
992.
993.
Yimei Cao Zengjun Lu Dong Li Pengju Fan Pu Sun Huifang Bao Yuanfang Fu Pinghua Li Xingwen Bai Yingli Chen Baoxia Xie Zaixin Liu 《Veterinary microbiology》2014,168(2-4):294-301
Epitope-based vaccines are always questioned for their cross-protection against the antigenically variable foot-and-mouth disease virus (FMDV). In this study, we proved the cross-protection effect of a multi-epitope vaccine incorporated with poly(I:C) against three topotypes of O type FMDV. A total of 45 naïve pigs were vaccinated with different doses of multi-epitope protein vaccine incorporated with poly(I:C). At 28 days post-vaccination, 45 vaccinated and 6 unvaccinated control pigs (two pigs for each group) were challenged with three topotypes of virulent O type FMDV, namely, O/Mya/98 (Southeast Asia topotype), O/HN/CHA/93 (Cathay topotype) and O/Tibet/CHA/99 (PanAsia topotype) strains. All unvaccinated pigs developed generalised FMD clinical signs. Results showed that all pigs (n = 15) conferred complete protection against the O/Mya/98 and O/HN/CHA/93 FMDV strains, 11 of which were protected against the O/Tibet/CHA/99 FMDV strain. The 50% protective dose values of the vaccine against the O/Mya/98, O/HN/CHA/93 and O/Tibet/CHA/99 FMDV strains were 15.59, 15.59 and 7.05, respectively. Contact challenge experiment showed that transmission occurred from the donors to the unvaccinated but not to vaccinated pigs. These results showed that vaccination with multi-epitope protein vaccine incorporated with poly(I:C) can efficiently prevent FMD in pigs. 相似文献
994.
Azusa SOMEYA Ryoko FUKUSHIMA Michiko YOSHIDA Yasuyuki TANAHASHI Tangmunkhong PRAPEUK Reiko IIZUKA Hiroshi HIRAMI Atsushi MATSUDA Shunichi TAKAHASHI Goro KURITA Takashi KIMURA Misuzu SEO Masayuki FUNABA Yoshii NISHINO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2014,76(8):1157-1160
995.
996.
K.M. Ivester L.L. Couëtil N.J. Zimmerman 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2014,28(6):1653-1665
Inhalant exposure to airborne irritants commonly encountered in horse stables is implicated in the pathogenesis of inflammatory airway disease (IAD) and recurrent airway obstruction (RAO), non‐infectious, inflammatory pulmonary disorders that impact the health and performance of horses across all equine disciplines. IAD and RAO have overlapping clinical, cytological, and functional manifestations of the pulmonary response to organic dust and noxious gases encountered in the barn environment. Study of these diseases has provided important but incomplete understanding of the effect of air quality upon the respiratory health of horses. In this review, the principles of particulate exposure assessment, including health‐related aerosol size fractions and size‐selective sampling, the factors influencing air quality in equine environments, and the effect of air quality on the equine respiratory tract are discussed. The objective of this review is to provide the reader with a summary of the most common chronic inflammatory airway diseases in the horse and the principles of air sampling that are essential to the planning, interpretation, and assessment of equine respiratory health‐related exposure studies. 相似文献
997.
998.
999.
1000.
Detection of Clinically Relevant Pain Relief in Cats with Degenerative Joint Disease Associated Pain
M.E. Gruen E. Griffith A. Thomson W. Simpson B.D.X. Lascelles 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2014,28(2):346-350