全文获取类型
收费全文 | 3654篇 |
免费 | 229篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 15篇 |
儿科学 | 69篇 |
妇产科学 | 52篇 |
基础医学 | 714篇 |
口腔科学 | 107篇 |
临床医学 | 284篇 |
内科学 | 672篇 |
皮肤病学 | 31篇 |
神经病学 | 435篇 |
特种医学 | 179篇 |
外科学 | 507篇 |
综合类 | 16篇 |
一般理论 | 2篇 |
预防医学 | 326篇 |
眼科学 | 82篇 |
药学 | 164篇 |
中国医学 | 5篇 |
肿瘤学 | 233篇 |
出版年
2023年 | 17篇 |
2022年 | 16篇 |
2021年 | 38篇 |
2020年 | 39篇 |
2019年 | 47篇 |
2018年 | 55篇 |
2017年 | 56篇 |
2016年 | 59篇 |
2015年 | 53篇 |
2014年 | 89篇 |
2013年 | 135篇 |
2012年 | 198篇 |
2011年 | 222篇 |
2010年 | 141篇 |
2009年 | 138篇 |
2008年 | 193篇 |
2007年 | 202篇 |
2006年 | 201篇 |
2005年 | 191篇 |
2004年 | 186篇 |
2003年 | 165篇 |
2002年 | 175篇 |
2001年 | 103篇 |
2000年 | 110篇 |
1999年 | 87篇 |
1998年 | 46篇 |
1997年 | 40篇 |
1996年 | 40篇 |
1995年 | 39篇 |
1994年 | 31篇 |
1993年 | 25篇 |
1992年 | 43篇 |
1991年 | 65篇 |
1990年 | 45篇 |
1989年 | 40篇 |
1988年 | 46篇 |
1987年 | 48篇 |
1986年 | 41篇 |
1985年 | 30篇 |
1984年 | 26篇 |
1983年 | 22篇 |
1982年 | 22篇 |
1981年 | 24篇 |
1980年 | 19篇 |
1979年 | 35篇 |
1978年 | 24篇 |
1975年 | 16篇 |
1974年 | 15篇 |
1969年 | 13篇 |
1968年 | 13篇 |
排序方式: 共有3893条查询结果,搜索用时 21 毫秒
1.
2.
Reiner W. Müller 《Lung》1949,101(6):666-681
3.
Johan Siebert Klara M. Posfay-Barbe† Walid Habre‡ Claire-Anne Siegrist 《Paediatric anaesthesia》2007,17(12):1218-1220
4.
A. Krödel B. Krauss H. J. Refior C. H. Siebert 《Archives of orthopaedic and trauma surgery》1990,109(3):133-138
Summary Twenty-nine patients were examined by magnetic resonance imaging for various lesions of the spine. The results of these scans were compared with those of plain radiographs, computertomographs, and radionuclide bone scans. The findings were substantiated by intraoperative or histological findings in 18 cases. The MRI scans proved to be very sensitive in the detection of a wide spectrum of morphological changes of the bone marrow of vertebral bodies. Characteristic changes of the signal patterns for inflammatory and tumorous lesions were not observed. The differentiation of these lesions will presently continue to have to be based on morphological criteria.No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this study. No funds were received in support of this study 相似文献
5.
C. H. Siebert K. -P. Lehrbaß-Sökeland F. Rinke M. Hansis 《Archives of orthopaedic and trauma surgery》1997,116(6-7):390-395
During the time period from May 1990 to December 1992, a total of 75 tibia fractures were treated in the Department of Traumatology at the University of Bonn. Thirtyeight patients with 40 tibial fractures were managed according to a regimen including primary stabilization, usually using external fixation, soft tissue reconstruction and delayed open reduction and internal fixation using an AO compression plate. The majority of the patients had been involved in motor vehicle accidents, leading to multiple injuries in 24 instances. An open fracture was seen 18 times. The 20% complication rate is comparable to the reports following intramedullary stabilization. Only one infection, following a grade 2 open fracture, was seen after the definitive stabilization. Bony union was achieved after 15.7 weeks. In light of the complications associated with intramedullary nailing, such as fat or air embolism, heterotopic ossification and non- or malunions, use of the tibial plate does not offer just logistic advantages, but is a viable alternative for delayed stabilization of tibial fractures.No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. No funds were received in support of this study. 相似文献
6.
7.
8.
Claudia Brogsitter Thomas Grüning Reiner Weise Peter Wielepp Oliver Lindner Reiner K?rfer Wolfgang Burchert 《Journal of nuclear medicine》2005,46(1):19-24
(18)F-FDG PET is an important diagnostic tool for detecting myocardial viability in patients with coronary artery disease. In combination with perfusion scanning, (18)F-FDG PET allows differentiation between reversibly and irreversibly damaged myocardium and selection of patients likely to benefit from revascularization. Viability PET is usually performed in two-dimensional (2D) mode. Taking into account the rising number of three-dimensional (3D)-only scanners, a validation of 3D acquisition is required. METHODS: Twenty-one patients with coronary artery disease referred for (18)F-FDG PET underwent an imaging protocol of nongated 2D (2D-NG) and gated 2D (2D-G) acquisitions for 15 min each, followed by 3D gated acquisitions for 10 min (3D-10) and 5 min (3D-5), using an ECAT Exact HR+ scanner. Results were analyzed using a 20-segment polar map in terms of activity concentration (Bq/mL), viability (50% uptake threshold), regional activity distribution, visual assessment of viability based on a 3-point rating scale, and left ventricular ejection fraction. RESULTS: Activity concentration measured in each segment with 2D-G, 3D-10, and 3D-5 showed a good linear correlation with 2D-NG. Quantitative viability assessment with 3D-5 gave a sensitivity of 84% and a specificity of 98%, compared with 2D-NG. No differences in regional activity distribution and visual viability assessment were found between the various protocols. Left ventricular ejection fractions obtained with 3D-10 and 3D-5 showed a good linear correlation with those measured with 2D-G. CONCLUSION: An ECG-gated 3D imaging protocol gave results comparable to those of 2D acquisition with regard to absolute and regional myocardial activity distribution, left ventricular function, and visual viability assessment. Sensitivity for viability assessment with a 50% uptake threshold was significantly less with 3D, but specificity was maintained. This protocol delivers a clinical performance nearly equivalent to that of 2D acquisition. 相似文献
9.
10.
股骨干骨折--逆行穿钉与顺行穿钉的探讨 总被引:1,自引:0,他引:1
在对股骨骨折进行逆行和顺行置入髓内钉治疗时,两种治疗方法产生很高的愈合率和相近的畸形愈合率。虽然未经过一致的认定,但那些接受顺行穿钉治疗的患者愈合较快。患者在接受逆行穿钉治疗后膝关节疼痛频繁出现,然而髋关节疼痛和异位骨化现象却在接受顺行穿钉治疗的患者中存在。患其它并发症的几率也无显著增长。因此不能决定功能结果。 相似文献