全文获取类型
收费全文 | 83篇 |
免费 | 3篇 |
专业分类
林业 | 20篇 |
11篇 | |
综合类 | 12篇 |
农作物 | 6篇 |
畜牧兽医 | 17篇 |
园艺 | 10篇 |
植物保护 | 10篇 |
出版年
2021年 | 4篇 |
2020年 | 4篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 7篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 2篇 |
2012年 | 7篇 |
2011年 | 11篇 |
2010年 | 3篇 |
2009年 | 4篇 |
2008年 | 7篇 |
2007年 | 2篇 |
2006年 | 2篇 |
2005年 | 1篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1986年 | 1篇 |
排序方式: 共有86条查询结果,搜索用时 187 毫秒
81.
82.
Mycoplasma bovis was detected in 134 (18 per cent) of 736 samples of bovine lung tissue collected from fatal pneumonia cases in the Republic of Ireland between April 1995 and December 1998. The cases occurred in 95 herds and recurred in four of them. Other respiratory pathogens were identified in 66 per cent of the M bovis-positive cases, with Pasteurella species, infectious bovine rhinotracheitis and parainfluenza 3 virus being most frequently detected. Mastitis and arthritis were less common clinical signs associated with M bovis infection; 22 cases of M bovis mastitis and five cases of M bovis arthritis were diagnosed in five herds. 相似文献
83.
84.
Bonifati V Rizzu P van Baren MJ Schaap O Breedveld GJ Krieger E Dekker MC Squitieri F Ibanez P Joosse M van Dongen JW Vanacore N van Swieten JC Brice A Meco G van Duijn CM Oostra BA Heutink P 《Science (New York, N.Y.)》2003,299(5604):256-259
The DJ-1 gene encodes a ubiquitous, highly conserved protein. Here, we show that DJ-1 mutations are associated with PARK7, a monogenic form of human parkinsonism. The function of the DJ-1 protein remains unknown, but evidence suggests its involvement in the oxidative stress response. Our findings indicate that loss of DJ-1 function leads to neurodegeneration. Elucidating the physiological role of DJ-1 protein may promote understanding of the mechanisms of brain neuronal maintenance and pathogenesis of Parkinson's disease. 相似文献
85.
Gan Q Ferrand Y Bao C Kauffmann B Grélard A Jiang H Huc I 《Science (New York, N.Y.)》2011,331(6021):1172-1175
Dynamic assembly is a powerful fabrication method of complex, functionally diverse molecular architectures, but its use in synthetic nanomachines has been hampered by the difficulty of avoiding reversible attachments that result in the premature breaking apart of loosely held moving parts. We show that molecular motion can be controlled in dynamically assembled systems through segregation of the disassembly process and internal translation to time scales that differ by four orders of magnitude. Helical molecular tapes were designed to slowly wind around rod-like guests and then to rapidly slide along them. The winding process requires helix unfolding and refolding, as well as a strict match between helix length and anchor points on the rods. This modular design and dynamic assembly open up promising capabilities in molecular machinery. 相似文献
86.
William D. Dijak Brice B. Hanberry Jacob S. Fraser Hong S. He Wen J. Wang Frank R. ThompsonIII 《Landscape Ecology》2017,32(7):1365-1384