全文获取类型
收费全文 | 595篇 |
免费 | 26篇 |
国内免费 | 2篇 |
学科分类
医药卫生 | 623篇 |
出版年
2021年 | 20篇 |
2020年 | 7篇 |
2019年 | 18篇 |
2018年 | 13篇 |
2017年 | 6篇 |
2016年 | 9篇 |
2015年 | 10篇 |
2014年 | 12篇 |
2013年 | 10篇 |
2012年 | 20篇 |
2011年 | 20篇 |
2010年 | 16篇 |
2009年 | 12篇 |
2008年 | 18篇 |
2007年 | 16篇 |
2006年 | 22篇 |
2005年 | 13篇 |
2004年 | 20篇 |
2003年 | 23篇 |
2002年 | 22篇 |
2001年 | 20篇 |
2000年 | 13篇 |
1999年 | 15篇 |
1998年 | 9篇 |
1997年 | 17篇 |
1996年 | 13篇 |
1995年 | 14篇 |
1994年 | 14篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1991年 | 8篇 |
1990年 | 11篇 |
1989年 | 13篇 |
1988年 | 15篇 |
1987年 | 13篇 |
1986年 | 20篇 |
1985年 | 11篇 |
1984年 | 12篇 |
1983年 | 8篇 |
1982年 | 10篇 |
1981年 | 5篇 |
1980年 | 14篇 |
1979年 | 4篇 |
1978年 | 8篇 |
1977年 | 8篇 |
1976年 | 3篇 |
1975年 | 4篇 |
1974年 | 3篇 |
1970年 | 5篇 |
1969年 | 3篇 |
排序方式: 共有623条查询结果,搜索用时 15 毫秒
1.
Drishty Satpati Ketaki Bapat Archana Mukherjee Sharmila Banerjee Kanchan Kothari Meera Venkatesh 《Applied radiation and isotopes》2006,64(8):888-892
Studies on the development of imaging agents for targeting neuroreceptors is an area of considerable interest owing to the limited availability of specific as well as selective radiolabeled agents. Therefore, with an aim of developing a receptor-specific agent, iminodiacetic acid (IDA) derivative of 5-hydroxy tryptamine viz., HTIDA has been synthesized. HTIDA could be radiolabeled with the synthon [(99m)Tc(CO)(3)(H(2)O)(3)](+) in >98% yield. The biodistribution studies in normal Swiss mice showed that the (99m)Tc(CO)(3)-HTIDA crosses the blood-brain barrier successfully with a brain uptake of 0.5%ID/g at 5min post injection. The other relevant observations from biodistribution studies included no significant uptake in any other organ and fast clearance from blood, lungs and liver. 相似文献
2.
3.
4.
5.
6.
The effect of chemical shift on magnetic resonance (MR) imaging of the pituitary fossa was studied. Healthy volunteers underwent conventional MR imaging of the pituitary fossa and then imaging with the frequency-encoding gradient reversed or with the phase- and frequency-encoding gradients interchanged. Comparison of the image pairs in each subject showed that the thin, black stripe evident at the water-fat interface within the pituitary fossa was altered when the gradients were changed. Therefore, the low-intensity signal within the pituitary fossa is a chemical shift misregistration effect. 相似文献
7.
8.
9.
Anulus fibrosus in bulging intervertebral disks 总被引:1,自引:0,他引:1
In this investigation the association of radial tears of the anulus fibrosus and bulging of the intervertebral disk was studied. An index of disk bulging was measured in sagittal anatomic sections in 149 lumbar disks from 31 cadavers. The indexes of disk bulging were correlated with stages of disk development and the presence of an annular tear. The largest disk-bulging indexes were always associated with radial tears of the anulus. Eighty-four percent of the disks with radial tears had disk-bulging indexes greater than 2.5 mm. Most normal adult disks had an index of less than 2.5 mm. The results challenge the concept that the anulus fibrosus is intact in bulging disks, although ruptured in herniated disks. 相似文献
10.