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   1779篇
  免费   104篇
  国内免费   10篇
耳鼻咽喉   8篇
儿科学   48篇
妇产科学   28篇
基础医学   188篇
口腔科学   16篇
临床医学   116篇
内科学   426篇
皮肤病学   48篇
神经病学   90篇
特种医学   184篇
外科学   410篇
综合类   8篇
预防医学   139篇
眼科学   11篇
药学   79篇
中国医学   2篇
肿瘤学   92篇
  2023年   7篇
  2022年   18篇
  2021年   33篇
  2020年   30篇
  2019年   33篇
  2018年   50篇
  2017年   26篇
  2016年   20篇
  2015年   33篇
  2014年   37篇
  2013年   62篇
  2012年   71篇
  2011年   75篇
  2010年   58篇
  2009年   58篇
  2008年   85篇
  2007年   92篇
  2006年   87篇
  2005年   90篇
  2004年   64篇
  2003年   66篇
  2002年   75篇
  2001年   51篇
  2000年   66篇
  1999年   65篇
  1998年   25篇
  1997年   29篇
  1996年   26篇
  1995年   19篇
  1994年   27篇
  1993年   19篇
  1992年   33篇
  1991年   36篇
  1990年   27篇
  1989年   37篇
  1988年   29篇
  1987年   22篇
  1986年   35篇
  1985年   24篇
  1984年   25篇
  1982年   15篇
  1981年   10篇
  1980年   11篇
  1979年   10篇
  1978年   8篇
  1977年   11篇
  1976年   9篇
  1975年   8篇
  1972年   6篇
  1968年   9篇
排序方式: 共有1893条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Proximal femoral focal deficiency, an uncommon congenital anomaly, necessitates early radiologic classification for surgical planning and treatment. Objective radiographic criteria, including femoral length index, acetabular depth index, acetabular angle index, and shape of the proximal femur were determined in 49 patients before cartilaginous ossification of the femoral capital epiphysis; final classification was based on follow-up radiographs or findings at arthrography or surgery. These parameters were analyzed to determine the accuracy and contributions of each in classification. Correct classification into one of three groups was possible in 86% of cases with use of three of the parameters: femoral length index, acetabular depth index, and shape of the proximal femur. The acetabular angle was found to contribute insignificantly to classification. Magnetic resonance imaging, used in only one case, depicted the nonossified cartilaginous femoral capital epiphysis, thus obviating the need for invasive diagnostic procedures and facilitating early classification.  相似文献   
5.
6.
7.
We assayed prostatic specific antigen and prostatic acid phosphatase serum levels in 1,383 patients using a double antibody radioimmunoassay (RIA) 125I. Establishing the upper normal limit in 10 ng/ml for prostatic specific antigen and 2.5 ng/ml for prostatic acid phosphatase, the false positive results were only 1.9 and 5.1% in men with nonprostatic benign or malignant pathology and 0 and 2.2% in women, respectively. We detected false positive levels in 3.5 and 4.7% of the patients with noncomplicated benign prostatic hypertrophy, 64.8 and 19.2% in complicated benign prostatic hypertrophy, 24 and 16% in acute prostatitis and 3.3% in chronic prostatitis for both tumoral markers. The sensibility in patients with prostate cancer was 87.2 and 64.1%, respectively, and there was better correlation with prostatic specific antigen than prostatic acid phosphatase levels on tumoral spread and histologic grading. Finally, the clinical efficacy was higher with prostatic specific antigen and it did not increase with the quantification of both tumoral markers.  相似文献   
8.
9.
We studied four patients with ruptured aneurysms of the sinus of Valsalva. All were men with a mean age of 33 years. The presenting illness was insidious in three and of abrupt onset in one. Physical examination showed a continuous murmur in all. Chest X ray film showed moderate cardiomegaly. Electrocardiogram disclosed left ventricular hypertrophy. Echocardiogram revealed the site of the rupture which was corroborated by aortography. Two aneurysms ruptured to the right ventricle and two to the right atrium. All were corrected by surgery. All patients became asymptomatic.  相似文献   
10.
The management of three patients with left ventricular fibromas is outlined. All were asymptomatic children. Routine chest radiography suggested cardiac masses. M-mode and two-dimensional echocardiography were valuable adjuncts to conventional angiography in assessing these children. Electrocardiographic changes, present in all cases, were shown to regress postoperatively. We stress the importance of these noninvasive aids in the initial investigation and outline our operative methods of reconstruction.  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