全文获取类型
收费全文 | 2591821篇 |
免费 | 185244篇 |
国内免费 | 7605篇 |
专业分类
耳鼻咽喉 | 34303篇 |
儿科学 | 85315篇 |
妇产科学 | 71620篇 |
基础医学 | 364175篇 |
口腔科学 | 69736篇 |
临床医学 | 234776篇 |
内科学 | 516765篇 |
皮肤病学 | 62568篇 |
神经病学 | 213712篇 |
特种医学 | 100031篇 |
外国民族医学 | 736篇 |
外科学 | 387260篇 |
综合类 | 50413篇 |
现状与发展 | 5篇 |
一般理论 | 968篇 |
预防医学 | 196294篇 |
眼科学 | 56710篇 |
药学 | 188286篇 |
8篇 | |
中国医学 | 5340篇 |
肿瘤学 | 145649篇 |
出版年
2021年 | 20071篇 |
2019年 | 20683篇 |
2018年 | 29362篇 |
2017年 | 22658篇 |
2016年 | 26322篇 |
2015年 | 29578篇 |
2014年 | 40540篇 |
2013年 | 60537篇 |
2012年 | 80444篇 |
2011年 | 84702篇 |
2010年 | 51135篇 |
2009年 | 49276篇 |
2008年 | 79269篇 |
2007年 | 84119篇 |
2006年 | 85849篇 |
2005年 | 81983篇 |
2004年 | 78970篇 |
2003年 | 76327篇 |
2002年 | 73600篇 |
2001年 | 128546篇 |
2000年 | 131489篇 |
1999年 | 110642篇 |
1998年 | 31331篇 |
1997年 | 27964篇 |
1996年 | 28256篇 |
1995年 | 27422篇 |
1994年 | 25093篇 |
1993年 | 23454篇 |
1992年 | 85213篇 |
1991年 | 81626篇 |
1990年 | 78842篇 |
1989年 | 76114篇 |
1988年 | 69514篇 |
1987年 | 68030篇 |
1986年 | 63574篇 |
1985年 | 60533篇 |
1984年 | 44957篇 |
1983年 | 37958篇 |
1982年 | 22467篇 |
1981年 | 19994篇 |
1979年 | 38980篇 |
1978年 | 27451篇 |
1977年 | 23271篇 |
1976年 | 21504篇 |
1975年 | 22822篇 |
1974年 | 26801篇 |
1973年 | 25391篇 |
1972年 | 23769篇 |
1971年 | 21969篇 |
1970年 | 20196篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
P.C.G. Simons A.A. Nawijn C.M.A. Bruijninckx B. Knippenberg E.H. de Vries H. van Overhagen 《European journal of vascular and endovascular surgery》2006,32(6):627-633
OBJECTIVE: To determine the safety and the long-term results of primary stent placement for localized distal aortic occlusive disease. DESIGN: Retrospective observational study. PATIENTS AND METHODS: From July 1998 to July 2005 17 patients (14 female and 3 men, mean age 57 years (39-80)) were treated for intermittent claudication. Five of these patients underwent additional endovascular treatment of focal iliac lesions. RESULTS: Technical success defined as residual stenosis of less than 50% or a trans-stenotic systolic pressure gradient <10% was achieved in 14 of 17 (82%) patients. Major complications included dissection at the puncture site in one patient and thrombosis of additional iliac stents in another patient. Both of these complications were successfully treated. During a mean follow-up of 27 months (range 1-86), four patients had recurrence of symptoms due to in-stent restenoses (n=2), femoral (n=1) or iliac occlusion (n=1), respectively. By Kaplan-Meier analysis, primary aortic hemodynamic patency was 83% at 3 years. Secondary aortic hemodynamic patency was 100%. The primary clinical patency was 68% at 3 years. CONCLUSION: Primary stent placement for distal aortic stenoses is an alternative to surgical treatment because of its high patency and relatively low complication rates. 相似文献
972.
973.
974.
H.M. Evans 《Canadian Medical Association journal》2005,172(5):667-668
975.
976.
977.
978.
Guerard W. Byrne Johannes M. Schirmer David N. Fass Sumeet S. Teotia Walter K. Kremers Hui Xu Bashoo Naziruddin Henry D. Tazelaar John S. Logan Christopher G. A. McGregor 《American journal of transplantation》2005,5(5):1011-1020
Microvascular thrombosis is a prominent feature in cardiac delayed xenograft rejection (DXR). We investigated the impact of warfarin or low-molecular-weight heparin (LMWH) anti-coagulation on xenograft function using a heterotopic pig-to-primate model. Donor hearts were from CD46 transgenic pigs and baboon immunosuppression included tacrolimus, sirolimus, anti-CD20 and TPC, an alpha-galactosyl-polyethylene glycol conjugate. Three groups of animals were studied. Group 1 (n = 9) was treated with warfarin, Group 2 (n = 13) with LMWH and Group 3, received no anti-coagulant drugs. The median duration of xenograft function was 20 days (range 3-62 days), 18 days (range 5-109 days) and 15 days (range 4-53 days) in Groups 1 to 3 respectively. Anti-coagulation achieved the targeted international normalized prothrombin ratio (INR) and anti-factor Xa levels consistent with effective in vivo therapy yet, no significant impact on median xenograft function was observed. At rejection, a similar histology of thrombosis and ischemia was apparent in each group and the levels of fibrin deposition and platelet thrombi in rejected tissue was the same. Anti-coagulation with warfarin or LMWH did not have a significant impact on the onset of DXR and microvascular thrombosis. However, a role for specific anti-coagulant strategies to achieve long-term xenograft function cannot be excluded. 相似文献
979.
980.