全文获取类型
收费全文 | 3303篇 |
免费 | 251篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 28篇 |
儿科学 | 111篇 |
妇产科学 | 86篇 |
基础医学 | 539篇 |
口腔科学 | 62篇 |
临床医学 | 220篇 |
内科学 | 819篇 |
皮肤病学 | 110篇 |
神经病学 | 254篇 |
特种医学 | 169篇 |
外科学 | 457篇 |
综合类 | 48篇 |
预防医学 | 247篇 |
眼科学 | 33篇 |
药学 | 221篇 |
中国医学 | 3篇 |
肿瘤学 | 173篇 |
出版年
2023年 | 21篇 |
2022年 | 26篇 |
2021年 | 79篇 |
2020年 | 52篇 |
2019年 | 107篇 |
2018年 | 100篇 |
2017年 | 66篇 |
2016年 | 66篇 |
2015年 | 92篇 |
2014年 | 123篇 |
2013年 | 137篇 |
2012年 | 168篇 |
2011年 | 192篇 |
2010年 | 124篇 |
2009年 | 113篇 |
2008年 | 152篇 |
2007年 | 149篇 |
2006年 | 164篇 |
2005年 | 142篇 |
2004年 | 134篇 |
2003年 | 136篇 |
2002年 | 135篇 |
2001年 | 97篇 |
2000年 | 104篇 |
1999年 | 92篇 |
1998年 | 74篇 |
1997年 | 57篇 |
1996年 | 57篇 |
1995年 | 44篇 |
1994年 | 47篇 |
1993年 | 26篇 |
1992年 | 36篇 |
1991年 | 41篇 |
1990年 | 53篇 |
1989年 | 51篇 |
1988年 | 47篇 |
1987年 | 39篇 |
1986年 | 23篇 |
1985年 | 34篇 |
1984年 | 14篇 |
1983年 | 26篇 |
1981年 | 12篇 |
1980年 | 15篇 |
1979年 | 11篇 |
1978年 | 10篇 |
1976年 | 7篇 |
1975年 | 11篇 |
1974年 | 7篇 |
1972年 | 8篇 |
1966年 | 9篇 |
排序方式: 共有3580条查询结果,搜索用时 15 毫秒
1.
2.
3.
Sonoelasticity imaging of prostate cancer: in vitro results 总被引:2,自引:0,他引:2
4.
5.
Aneurisma de aorta abdominal infrarrenal en asociación con riñón en herradura: aportación de un caso
Nerea Senarriaga Ruiz de la Illa Reyes Vega Manrique Isabel Lacasa Viscasillas Iñaki Iriarte Soldevilla Miguel Unda Urzaiz 《Actas urologicas espa?olas》2009,33(10):1141-1144
We review the association between surgically resolvable aortic disease and horseshoe kidney with a discussion of diagnostic problems and therapeutic options.Male patient 81 years of age with horseshoe kidney and an abdominal aortic aneurysm that was discovered by chance in an abdominal ultrasound during a check-up for his prostate condition.A retroperitoneal approach was used in order to resect the aneurysm and perform an aorto-aortic bypass with no complications occurring. Two years after the diagnosis, the patient is still asymptomatic from a vascular point of view.The co-presence of horseshoe kidney and aortic disease needing surgical correction is infrequent, but it significantly increases the technical complexity of aortic reconstruction. A literature review is included. 相似文献
6.
7.
8.
9.
The authors studied the effects of 4-hydroxyandrostene-3,17-dione (4-OHA) on progesterone (P), 17 beta-estradiol (E2), and 20 alpha-hydroxy-4-pregnen-3-one synthesis and pregnenolone accumulation in cultured human midluteal cells. A dose-dependent inhibition with and without human chorionic gonadotropin (hCG) of E2 and P production was observed. The accumulation of pregnenolone was significantly enhanced three to fourfold by 4-OHA in this culture system, as compared with control value. In addition, a sevenfold increase on pregnenolone accumulation was observed in the presence of 4-OHA plus 10 IU of hCG as compared with control values and 2.2-fold as compared with the 4-OHA treatments. These in vitro findings indicate a direct effect of 4-OHA on luteal steroidogenesis. Nevertheless, the suppressive effect of 4-OHA on P and E2 production is located at different sites of the steroidogenic pathway. In addition, the results demonstrate that hCG in the presence of 4-OHA stimulated pregnenolone accumulation, suggesting that the inhibition of P synthesis is in some steps after the formation of pregnenolone. These data indicate that the actions of 4-OHA on P or E2 formation have different inhibitory mechanisms. 相似文献