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   11745篇
  免费   929篇
  国内免费   85篇
耳鼻咽喉   109篇
儿科学   463篇
妇产科学   173篇
基础医学   1216篇
口腔科学   369篇
临床医学   971篇
内科学   2920篇
皮肤病学   283篇
神经病学   668篇
特种医学   597篇
外科学   1540篇
综合类   212篇
一般理论   5篇
预防医学   636篇
眼科学   507篇
药学   1015篇
中国医学   52篇
肿瘤学   1023篇
  2023年   107篇
  2022年   141篇
  2021年   280篇
  2020年   224篇
  2019年   199篇
  2018年   336篇
  2017年   228篇
  2016年   259篇
  2015年   311篇
  2014年   416篇
  2013年   517篇
  2012年   658篇
  2011年   688篇
  2010年   394篇
  2009年   430篇
  2008年   499篇
  2007年   526篇
  2006年   536篇
  2005年   468篇
  2004年   429篇
  2003年   398篇
  2002年   371篇
  2001年   321篇
  2000年   320篇
  1999年   248篇
  1998年   182篇
  1997年   163篇
  1996年   145篇
  1995年   136篇
  1994年   94篇
  1993年   101篇
  1992年   184篇
  1991年   178篇
  1990年   183篇
  1989年   189篇
  1988年   180篇
  1987年   191篇
  1986年   158篇
  1985年   131篇
  1984年   130篇
  1983年   90篇
  1982年   66篇
  1980年   62篇
  1979年   74篇
  1977年   65篇
  1976年   69篇
  1975年   64篇
  1974年   84篇
  1973年   67篇
  1971年   59篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
The numbers of free flap donor site as well as their indications are constantly increasing. Despite increasing popularity of microvascular reconstructive procedures, literature lacks clear and objective outcome criteria. This paper reports on a simple outcome classification that has become a routine part of the unit's large workload of microvascular outcome recording. The classification was formed through a retrospective analysis of 241 consecutive cases from 2000 to 2001 and is a five graded numerical classification. Grade 1 equates to total success without co-morbidity and grade 5 to a major complication such as amputation, etc., whatever the status of the flap itself. From 2002 to 2005 the classification was prospectively used on 527 consecutive cases with ease of integration into routine clinical practice. The Classification would enable a more objective record keeping thus analysis of the outcome. It would allow a more realistic comparison of different techniques or donor types as well set a benchmarking level for further improvement of the results.  相似文献   
5.
Endoscopic clips have been used mainly for control of gastrointestinal (GI) bleeding and occasionally for closure of GI perforations. However, closure of spontaneous esophageal perforation (Boerhaave's syndrome) by clipping has not been reported. We described successful non-surgical closure of spontaneous esophageal perforation by endoscopic clipping in a patient with bilateral pyopneumothorax and septicemia.  相似文献   
6.
7.
Molecular characterization of Wuchereria bancrofti is essential to develop suitable anti-filarial drugs and vaccines. We describe here isolation, sequence analysis and cloning of a partial cDNA of an enzyme superoxide dismutase from this parasite. The immunoscreening of a lambda zap W. bancrofti microfilarial (Mf) cDNA library with microfilaremic sera had resulted in the isolation of several seroreactive clones including, WbSOD. This clone contained a 309 bp insert and showed significant nucleotide and deduced amino acid sequence homologies to the superoxide dismutases of other nematode parasites. The antioxidant property of this enzyme may have important contribution in the defense mechanism of the parasite against host immune response.  相似文献   
8.
OBJECTIVES: to examine the management and outcome of patients with traumatic popliteal artery pseudoaneurysms with delayed presentation. MATERIALS: over a 2-year period 7 patients with traumatic popliteal pseudoaneurysms presenting to a tertiary referral unit after a delay of 1 month were reviewed. METHODS: a retrospective review of clinical records. RESULTS: the median interval between injury and presentation was 1.5 months (range 1-24 months). Penetrating trauma from gunshot wounds was the cause of the initial vascular injury in 6 patients and a stab wound in one. All patients had large pseudoaneurysms of more than 8 cm filling the popliteal fossa with variable degrees of fixed flexion deformity (FFD) of the knee. Severe FFD of more than 40 degrees was noted in 2 patients and 3 others had mild flexion deformities of 10 to 20 degrees. Six patients underwent repair of the pseudoaneurysm. One patient required an above knee amputation due to an infected false aneurysm. There were no deaths or graft related complications. Despite aggressive post-operative physiotherapy only 2 patients were able to completely straighten the leg at the time of discharge. CONCLUSIONS: in patients with neglected popliteal artery pseudoaneurysms, morbidity is associated with the pre-operative degree of fixed flexion deformity of the knee.  相似文献   
9.
10.
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