全文获取类型
收费全文 | 570篇 |
免费 | 81篇 |
专业分类
651篇 |
出版年
2022年 | 7篇 |
2021年 | 5篇 |
2019年 | 5篇 |
2018年 | 10篇 |
2017年 | 7篇 |
2016年 | 5篇 |
2015年 | 11篇 |
2014年 | 17篇 |
2013年 | 21篇 |
2012年 | 34篇 |
2011年 | 36篇 |
2010年 | 23篇 |
2009年 | 15篇 |
2008年 | 29篇 |
2007年 | 34篇 |
2006年 | 19篇 |
2005年 | 17篇 |
2004年 | 20篇 |
2003年 | 26篇 |
2002年 | 15篇 |
2001年 | 19篇 |
2000年 | 19篇 |
1999年 | 22篇 |
1998年 | 11篇 |
1997年 | 9篇 |
1996年 | 7篇 |
1995年 | 11篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 10篇 |
1991年 | 14篇 |
1990年 | 13篇 |
1989年 | 21篇 |
1988年 | 10篇 |
1987年 | 6篇 |
1986年 | 11篇 |
1985年 | 9篇 |
1984年 | 11篇 |
1981年 | 4篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 7篇 |
1976年 | 5篇 |
1975年 | 5篇 |
1974年 | 8篇 |
1973年 | 5篇 |
1969年 | 3篇 |
1968年 | 3篇 |
1967年 | 4篇 |
1966年 | 5篇 |
排序方式: 共有651条查询结果,搜索用时 0 毫秒
641.
642.
643.
644.
645.
K.H.G. Mills M. Page P. Kitchin L. Chan W. Jones P. Silvera T. Corcoran B. Flanagan C. Ling C. Thiriart M. DeWilde C. Bruck E. Rud B. Clark E.J. Stott 《Journal of medical primatology》1993,22(2-3):104-109
Macaques were immunised with lentil lectin purified recombinant SIVmac (BK28) derived gp160 (rgp160) with or without live vaccinia (vac)-env (BK28) priming, followed by a final boost with solid matrix antibody antigen (SMAA)-gp160 (J5) complexes and challenged with the SIVmac molecularly cloned virus J5M. Rgp160 and vac-env plus gp160 induced strong Ab responses against the homologous virus. Live vac-env did not enhance or prolong the antibody response, however, T cell responses were stronger. Analysis of the specificity of the immune response demonstrated that sequence variation within SIVmac viruses can affect antibody and T cell recognition. A single booster immunisation with the heterologous SIVmac J5 env recombinant protein was not sufficient to protect against the molecularly cloned virus J5M. These findings further illustrate the difficulty of generating protective immunity with immunogens based on single sequence recombinants. 相似文献
646.
Probability Distributions and Compartment Boundaries in the Development of Drosophila 总被引:1,自引:1,他引:0
James R. Flanagan 《Genetics》1981,98(1):115-142
647.
648.
649.
Postnatal Development and Possible Ligand Function of the CNS-Specific Membrane Glycoprotein CNSgp 130 总被引:1,自引:1,他引:0
CNSgp 130 is a CNS-specific membrane glycoprotein present in large amounts in the adult mammalian CNS. Using immunohistological techniques, we demonstrated that CNSgp130 is not detectable in the rat cerebellum at birth, and does not appear in the cerebellum until the tenth day of postnatal life. It is expressed first in the white matter of the cerebellar folia, and subsequently (by day 14) it is expressed also in the molecular layer. Expression in the granular layer is not seen until the 18th day of postnatal life, by which time the adult pattern of expression is established. CNSgp130 is also not detectable in the cerebrum at birth. However, it is expressed weakly but diffusely in the cerebrum by the fourth day of life. By the 10th day, there is strong expression in the cerebrum, in marked contrast to its virtual absence from the cerebellum at this stage. By quantitative absorption analysis, CNSgp 130 was undetectable on the day of birth, and increased steadily to 80% of adult values by the 22nd day of postnatal life. Binding studies with pure CNSgp130 demonstrated a Pronase-sensitive ligand in adult chicken brain. This ligand was absent from neonatal rat brain and non-CNS tissues. 相似文献
650.