全文获取类型
收费全文 | 183269篇 |
免费 | 18044篇 |
国内免费 | 7414篇 |
专业分类
耳鼻咽喉 | 1933篇 |
儿科学 | 3966篇 |
妇产科学 | 2848篇 |
基础医学 | 22508篇 |
口腔科学 | 3611篇 |
临床医学 | 24396篇 |
内科学 | 28563篇 |
皮肤病学 | 2465篇 |
神经病学 | 11495篇 |
特种医学 | 6406篇 |
外国民族医学 | 58篇 |
外科学 | 19917篇 |
综合类 | 20618篇 |
现状与发展 | 21篇 |
一般理论 | 79篇 |
预防医学 | 16989篇 |
眼科学 | 4541篇 |
药学 | 18593篇 |
132篇 | |
中国医学 | 6931篇 |
肿瘤学 | 12657篇 |
出版年
2023年 | 1733篇 |
2022年 | 4089篇 |
2021年 | 6239篇 |
2020年 | 4778篇 |
2019年 | 4312篇 |
2018年 | 4823篇 |
2017年 | 4256篇 |
2016年 | 4101篇 |
2015年 | 5920篇 |
2014年 | 7437篇 |
2013年 | 7958篇 |
2012年 | 11576篇 |
2011年 | 12694篇 |
2010年 | 8109篇 |
2009年 | 6824篇 |
2008年 | 9160篇 |
2007年 | 9319篇 |
2006年 | 8878篇 |
2005年 | 8680篇 |
2004年 | 6554篇 |
2003年 | 5976篇 |
2002年 | 5346篇 |
2001年 | 4833篇 |
2000年 | 4875篇 |
1999年 | 4598篇 |
1998年 | 2351篇 |
1997年 | 2205篇 |
1996年 | 1846篇 |
1995年 | 1654篇 |
1994年 | 1567篇 |
1993年 | 1214篇 |
1992年 | 2681篇 |
1991年 | 2512篇 |
1990年 | 2324篇 |
1989年 | 2241篇 |
1988年 | 2097篇 |
1987年 | 2107篇 |
1986年 | 1914篇 |
1985年 | 1840篇 |
1984年 | 1492篇 |
1983年 | 1322篇 |
1982年 | 880篇 |
1981年 | 757篇 |
1979年 | 1243篇 |
1978年 | 895篇 |
1977年 | 775篇 |
1976年 | 726篇 |
1974年 | 872篇 |
1973年 | 760篇 |
1972年 | 734篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
目的分析细棒、PEEK棒固定对寰枢关节稳定性的影响。方法采用6具新鲜成人枕骨(occipital bone,Oc)~颈椎C4节段进行测试,模拟以下手术及固定状态:①完整状态;②损伤状态:枢椎齿状突II型骨折;③坚强固定:寰枢椎均采用普通椎弓根螺钉固定,直径3.5 mm钛棒连接;④PEEK棒:直径3.5 mm的PEEK棒连接;⑤细棒:直径2.0 mm钛棒连接。采用重复测量实验设计,在完整、损伤和不同的固定状态下,通过脊柱试验机对标本分别施加1.5 N·m的前屈/后伸、左/右侧弯和左/右轴向旋转的纯力偶矩。采用Optotrak三维运动测量系统连续采集标本运动,分析寰枢椎之间角度运动范围和中性区。结果采用直径3.5 mm的钛棒,2.0 mm的细棒以及3.5 mm的PEEK棒固定后,在前屈、后伸、侧弯和旋转方向上均显著减小了固定节段的运动范围(P<0.05)。直径3.5 mm和2.0 mm的棒固定后的运动范围,在各个方向上无显著性差异。PEEK棒固定的运动范围仅在侧弯方向上大于坚强固定(P=0.005),其他方向无显著性差异。3种固定方式在屈伸、侧弯和旋转方向上均显著减小了固定节段的中性区(P<0.05)。各种固定方式之间相比较,无显著性差异(P>0.05)。结论在寰枢关节采用直径2.0 mm的细棒固定,与坚强固定的稳定性相当。采用直径3.5 mm的PEEK棒固定,在前屈、后伸、旋转方向上与坚强固定的稳定性相当,在侧弯方向上弱于坚强固定。 相似文献
3.
ObjectiveEach pulmonary segment is an anatomical and functional unit. However, it is fundamentally difficult to precisely distinguish every pulmonary segment using the conventional pulmonary intersegmental planes from computed tomography images. Building arteriopulmonary segments is likely to be an effective way to identify pulmonary segments.MethodsThe thoracic computed tomography images of 40 patients were collected. The anatomic structures of interest were extracted in the transverse, sagittal, and coronal planes using the semi-automated segmentation tools provided by Amira software. The intrapulmonary vessels were subsequently segmented and reconstructed. The distributions of the pulmonary arteries, veins, and bronchi were observed. In patients with pulmonary masses, the mass was also reconstructed.ResultsThe three-dimensional reconstructed images showed the branches of the pulmonary artery ramified up to their eighth order covering the entire lung as well as evident intersegmental gaps without pulmonary arteries. The segmental artery was closely accompanied by the segmental bronchi in 486 pulmonary segments (90% of total number of segments). The size and spatial location of the pulmonary mass within a pulmonary segment were also clearly visible.ConclusionsDemarcation of arteriopulmonary segments can be used to precisely distinguish every pulmonary segment and provide its detailed anatomical structure before pulmonary segmentectomy. 相似文献
4.
Isolated patellofemoral arthritis is an increasingly recognized entity, and is usually associated with previous patellofemoral dysplasia or instability. Patellofemoral arthroplasty (PFA) has evolved significantly in recent years, both in terms of implant design and importantly in the understanding of appropriate patient selection. This review outlines the indications and investigations for PFA, provides a brief history of the development of contemporary implants, and presents the clinical outcomes for the prostheses most commonly used in the UK. In addition, it provides a detailed surgical technique for implantation of an onlay implant, with tips on how to optimize patellofemoral biomechanics and thus achieve a consistently good outcome. 相似文献
5.
6.
Yuxiang Ma Wenfeng Fang Hongyun Zhao Sai Praneeth Bathena Amol Tendolkar Jennifer Sheng Li Zhang 《The oncologist》2021,26(4):e549-e566
Lessons Learned
- The overall safety profiles of ipilimumab 3 mg/kg and 10 mg/kg administered every 3 weeks, were consistent between Chinese patients with solid tumors in the current study and patients from previous U.S. ipilimumab monotherapy studies. No new safety signals were identified.
- The mean systemic exposures to ipilimumab (assessed by first dose area under the curve during the dosing interval and maximum serum concentration) were numerically lower in the Chinese patient population than in U.S. patients for both 3 mg/kg and 10 mg/kg doses; however, the range of serum concentrations in the Chinese and U.S. populations overlapped (3 mg/kg and 10 mg/kg), suggesting that ipilimumab pharmacokinetics was ethnically insensitive in this study.
7.
“三全育人”视角下思政教育机制实践与探索——“杏林成长导师”计划的构建 《医学教育管理》2021,7(6):656-660
“三全育人”是高校思政教育工作的关键一环,也是中医药高校推动思政教育的重要内容。以“三全育人”为视角对北京中医药大学思想政治教育举措“杏林成长导师”计划路径、内容深入分析,运用统计分析和文献研究方法,剖析该计划对中医学专业大学生的学业、思想和实践等多个层面的现实成效,从而为“三全育人”理念在中医药院校制度建构中的应用提供新的视角与方法。 相似文献
8.
Kara S. Tanaka MD Veronica R. Andaya BA Steven W. Thorpe MD Kenneth R. Gundle MD James B. Hayden MD Yee-Cheen Duong MD Raffi S. Avedian MD David G. Mohler MD Lee J. Morse MD Melissa N. Zimel MD Richard J. O'Donnell MD Andrew Fang MD Robert Lor Randall MD Tina H. Tran BS Christin New BA Rosanna L. Wustrack MD other members of Study Group FORCE 《Journal of surgical oncology》2023,127(1):148-158
9.
10.