首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   42331篇
  免费   3020篇
  国内免费   404篇
耳鼻咽喉   801篇
儿科学   603篇
妇产科学   671篇
基础医学   6829篇
口腔科学   1014篇
临床医学   3704篇
内科学   8146篇
皮肤病学   1621篇
神经病学   3280篇
特种医学   2420篇
外科学   5362篇
综合类   249篇
现状与发展   4篇
一般理论   20篇
预防医学   1925篇
眼科学   1020篇
药学   3874篇
中国医学   579篇
肿瘤学   3633篇
  2023年   205篇
  2022年   722篇
  2021年   1494篇
  2020年   798篇
  2019年   1154篇
  2018年   1342篇
  2017年   1076篇
  2016年   1557篇
  2015年   2092篇
  2014年   2346篇
  2013年   2670篇
  2012年   3916篇
  2011年   3674篇
  2010年   2271篇
  2009年   1833篇
  2008年   2468篇
  2007年   2252篇
  2006年   1958篇
  2005年   1878篇
  2004年   1538篇
  2003年   1332篇
  2002年   1200篇
  2001年   662篇
  2000年   656篇
  1999年   548篇
  1998年   260篇
  1997年   222篇
  1996年   172篇
  1995年   146篇
  1994年   130篇
  1993年   118篇
  1992年   258篇
  1991年   275篇
  1990年   224篇
  1989年   245篇
  1988年   200篇
  1987年   183篇
  1986年   172篇
  1985年   147篇
  1984年   109篇
  1983年   83篇
  1982年   55篇
  1981年   58篇
  1980年   54篇
  1979年   85篇
  1978年   60篇
  1975年   76篇
  1974年   57篇
  1972年   64篇
  1971年   58篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
25.
26.
27.
28.
This article describes a modified suture technique designed for the vertical repair of the anterior horn of the meniscus after arthroscopic decompression of a large meniscal cyst. This procedure comprises of three steps: first, the meniscus was pierced vertically using a suture hook and a No. 0 PDS suture. Second, both ends of the No. 0 PDS on the femoral and tibial surfaces of the meniscus were pulled to the outside of the joint capsule using a spinal needle preloaded with suture material. Finally, a skin incision was made adjacent to the suture materials, and both ends were tied. We recommend this technique not only for the vertical repair of the anterior horn of the meniscus after decompression of large meniscal cyst, but also to repair a longitudinal tear of the meniscus.  相似文献   
29.
Ruptured aneurysms of the distal anterior choroidal artery (AchA) are extremely rare and management is dictated by clinical presentation. This report describes a rare patient with a distal AchA aneurysm and subarachnoid and intraventricular haemorrhage. A 60-year-old woman presented with a sudden onset of severe headache and vomiting. No aneurysms could be found on initial angiograms. A repeat angiogram performed 10 days after admission demonstrated an aneurysm in a branch of the cisternal segment of the left AchA without a definite neck. Surrounding vessels showed multifocal stricture and dilatation. Microsurgical clipping was not performed because the patient died suddenly due to pulmonary failure. The aetiology of the aneurysm in this case and surgical strategy are discussed.  相似文献   
30.
Background/purpose: Vitiligo and nevus depigmentosus (ND) present similar hypopigmented macules with significantly different prognoses. Although the distinction between the two diseases is important, differential diagnosis relies on medical history and physical examination, which is far from decisive in some cases. The Mexameter® is an objective skin color-measuring device, and has been reported to provide a reproducible and sensitive means of quantifying small skin color differences. In this study, we investigated the usefulness of a Mexameter® for discriminating these diseases.
Methods: A selection of 202 hypopigmented skin lesions (182 from vitiligo and 20 from ND) were the objects of this study. Using a Mexameter, MIs were obtained from lesions and symmetrically located control skin. RMIs, ratios of the MIs of lesional skins to control skins, were calculated.
Results: The mean MIs and RMIs were significantly different for vitiligo and ND. The mean RMI of ND lesions was 74±13, which was significantly higher than that of vitiligo lesions (50±24). No ND lesion had an RMI of <50%.
Conclusion: This study shows that the Mexameter®, an objective pigment-measuring device, can be used to achieve a more accurate diagnosis of hypopigmentary disorders, and that the relative melanin index (RMI), which represents the relative pigment levels, might be a more effective parameter than the melanin index (MI) itself for comparing pigmentation differences.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号