全文获取类型
收费全文 | 4942篇 |
免费 | 372篇 |
国内免费 | 4篇 |
专业分类
林业 | 84篇 |
农学 | 67篇 |
基础科学 | 14篇 |
277篇 | |
综合类 | 472篇 |
农作物 | 73篇 |
水产渔业 | 114篇 |
畜牧兽医 | 4046篇 |
园艺 | 41篇 |
植物保护 | 130篇 |
出版年
2023年 | 70篇 |
2021年 | 31篇 |
2020年 | 125篇 |
2019年 | 42篇 |
2018年 | 95篇 |
2017年 | 104篇 |
2016年 | 93篇 |
2015年 | 95篇 |
2014年 | 157篇 |
2013年 | 210篇 |
2012年 | 172篇 |
2011年 | 186篇 |
2010年 | 142篇 |
2009年 | 154篇 |
2008年 | 182篇 |
2007年 | 135篇 |
2006年 | 122篇 |
2005年 | 116篇 |
2004年 | 145篇 |
2003年 | 152篇 |
2002年 | 140篇 |
2001年 | 139篇 |
2000年 | 120篇 |
1999年 | 125篇 |
1998年 | 125篇 |
1997年 | 117篇 |
1996年 | 98篇 |
1995年 | 97篇 |
1994年 | 88篇 |
1993年 | 111篇 |
1992年 | 164篇 |
1991年 | 138篇 |
1990年 | 144篇 |
1989年 | 104篇 |
1988年 | 120篇 |
1987年 | 118篇 |
1986年 | 87篇 |
1985年 | 101篇 |
1984年 | 67篇 |
1983年 | 77篇 |
1982年 | 35篇 |
1979年 | 34篇 |
1977年 | 20篇 |
1976年 | 24篇 |
1975年 | 22篇 |
1973年 | 31篇 |
1972年 | 22篇 |
1971年 | 20篇 |
1969年 | 24篇 |
1967年 | 17篇 |
排序方式: 共有5318条查询结果,搜索用时 78 毫秒
81.
Retrospective evaluation of the effect of high flow oxygen therapy delivered by nasal cannula on PaO2 in dogs with moderate‐to‐severe hypoxemia
下载免费PDF全文
![点击此处可从《Journal of Veterinary Emergency and Critical Care》网站下载免费的PDF全文](/ch/ext_images/free.gif)
82.
83.
84.
85.
C. W. Locuson P. Williams J. M. Adcock J. S. Daniels 《Journal of veterinary pharmacology and therapeutics》2016,39(2):122-130
The dog CYP1A2 enzyme is likely an important contributor to the metabolism of veterinary drugs. Dog CYP1A2 is expressed in liver, plus it is inducible and polymorphic, creating the potential for intersubject differences in pharmacokinetics. Hence, the ability to probe dog CYP1A2 activity and inhibition is relevant toward veterinary drug development and drug–drug interaction assessment. Previous studies have relied on human probes with questionable specificity for CYP1A2, so it was hypothesized that recombinant CYP1A2 could be used to find a specific CYP1A2 substrate. Intrinsic clearance experiments demonstrated that tizanidine was a substrate of CYP1A2. Profiling of tizanidine metabolites generated by CYP1A2 identified the imidazole metabolite that was detectable in dog plasma. The imidazole metabolite was subsequently used to evaluate tizanidine as a CYP1A2 probe. Co‐administration of the CYP1A inhibitor enrofloxacin with tizanidine significantly decreased (30%; n = 3) the formation of the imidazole metabolite vs. control experiments. As enrofloxacin is a weak inhibitor, further studies are required to confirm the sensitivity of tizanidine as an in vivo probe. However, tizanidine may be a more selective CYP1A2 probe than phenacetin when conducting in vitro studies due to the presence of other phenacetin‐metabolizing enzymes in dog liver microsomes. 相似文献
86.
Daniel J. Joffe Roxana Lelewski J. Scott Weese Jamie Mcgill-Worsley Catharine Shankel Sonia Mendonca Tara Sager Michael Smith Zvonimir Poljak 《The Canadian veterinary journal. La revue veterinaire canadienne》2016,57(1):46-51
This study investigated the association between presence of respiratory pathogens and development of Canine Infectious Respiratory Disease Complex (CIRDC) in dogs in 5 Canadian small animal clinics. In total, 86 dogs were tested using a commercial PCR respiratory panel; 64 dogs were considered as cases and 22 were control dogs matched by veterinary clinic. No control animals (0/22) were positive for canine parainfluenza virus (CPIV), whereas 27/64 (42%) CIRDC cases were positive. Furthermore, 81% of case dogs tested positive for Mycoplasma cynos, compared with 73% of control dogs. Canine respiratory corona virus (CRCoV) was detected in no control dogs compared with 9.4% of clinical dogs. No animals were positive for any influenza virus type A present in the diagnostic panel. Presence of CPIV was associated (P < 0.01) with the occurrence of CIRDC after adjustment for demographic factors and presence of CRCoV (P = 0.09). 相似文献
87.
88.
89.
Mechanical and Thermal Sensory Testing in Normal Chondrodystrophoid Dogs and Dogs with Spinal Cord Injury caused by Thoracolumbar Intervertebral Disc Herniations
下载免费PDF全文
![点击此处可从《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》网站下载免费的PDF全文](/ch/ext_images/free.gif)
90.