全文获取类型
收费全文 | 403篇 |
免费 | 24篇 |
专业分类
林业 | 47篇 |
农学 | 17篇 |
基础科学 | 3篇 |
91篇 | |
综合类 | 42篇 |
农作物 | 39篇 |
水产渔业 | 33篇 |
畜牧兽医 | 106篇 |
园艺 | 9篇 |
植物保护 | 40篇 |
出版年
2023年 | 4篇 |
2022年 | 11篇 |
2021年 | 18篇 |
2020年 | 13篇 |
2019年 | 10篇 |
2018年 | 20篇 |
2017年 | 19篇 |
2016年 | 19篇 |
2015年 | 15篇 |
2014年 | 17篇 |
2013年 | 28篇 |
2012年 | 24篇 |
2011年 | 32篇 |
2010年 | 23篇 |
2009年 | 22篇 |
2008年 | 18篇 |
2007年 | 21篇 |
2006年 | 28篇 |
2005年 | 18篇 |
2004年 | 16篇 |
2003年 | 22篇 |
2002年 | 15篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1987年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有427条查询结果,搜索用时 15 毫秒
421.
422.
Microbiologists have long been puzzled by the finding that the gut mucosa does not respond to the myriad varieties of bacteria that normally reside in the gut. As Xavier and Podolsky explain in their Perspective, this may be because bacteria that are indigenous to the gut have learned ways to switch off pathways in gut epithelial cells that lead to switching on of genes involved in inflammation (Neish et al.). 相似文献
423.
424.
Shav-Tal Y Darzacq X Shenoy SM Fusco D Janicki SM Spector DL Singer RH 《Science (New York, N.Y.)》2004,304(5678):1797-1800
Understanding gene expression requires the ability to follow the fate of individual molecules. Here we use a cellular system for monitoring messenger RNA (mRNA)expression to characterize the movement in real time of single mRNA-protein complexes (mRNPs) in the nucleus of living mammalian cells. This mobility was not directed but was governed by simple diffusion. Some mRNPs were partially corralled throughout the nonhomogenous nuclear environment, but no accumulation at subnuclear domains was observed. Following energy deprivation, energy-independent motion of mRNPs was observed in a highly ATP-dependent nuclear environment; movements were constrained to chromatin-poor domains and excluded by newly formed chromatin barriers. This observation resolves a controversy, showing that the energetic requirements of nuclear mRNP trafficking are consistent with a diffusional model. 相似文献
425.
426.
427.
Mathieu Diribarne Anne Vaiman Michel Péchayre E. Pailhoux Xavier Mata Gérard Guérin Stéphane Chaffaux 《Journal of Equine Veterinary Science》2009
Association of seven candidate genes with cryptorchidism was investigated in the Thoroughbred. A pedigree composed of 23 cryptorchids and 24 nonaffected horses, sharing a common ancestor, was constituted. Sixteen microsatellite markers were developed either from bacterial artificial chromosomes (BAC) isolated for each candidate gene or by in silico screening. DNA from our pedigree was genotyped for these microsatellites. Statistical analysis of the allelic and genotypic frequencies observed with these markers did not reveal any association between the candidate genes and the cryptorchidism phenotype in our horse panel. 相似文献