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   178297篇
  免费   1140篇
  国内免费   7篇
耳鼻咽喉   1143篇
儿科学   6812篇
妇产科学   3065篇
基础医学   16903篇
口腔科学   1591篇
临床医学   12530篇
内科学   31262篇
皮肤病学   767篇
神经病学   16618篇
特种医学   8979篇
外科学   29059篇
综合类   2518篇
一般理论   1篇
预防医学   18285篇
眼科学   2794篇
药学   9714篇
中国医学   640篇
肿瘤学   16763篇
  2022年   65篇
  2021年   119篇
  2020年   73篇
  2019年   83篇
  2018年   21992篇
  2017年   17413篇
  2016年   19589篇
  2015年   978篇
  2014年   910篇
  2013年   918篇
  2012年   7149篇
  2011年   21186篇
  2010年   18936篇
  2009年   11580篇
  2008年   19627篇
  2007年   21807篇
  2006年   671篇
  2005年   2264篇
  2004年   3460篇
  2003年   4428篇
  2002年   2582篇
  2001年   371篇
  2000年   485篇
  1999年   240篇
  1998年   223篇
  1997年   224篇
  1996年   103篇
  1995年   123篇
  1994年   118篇
  1993年   84篇
  1992年   80篇
  1991年   132篇
  1990年   161篇
  1989年   106篇
  1988年   84篇
  1987年   64篇
  1986年   48篇
  1985年   55篇
  1984年   39篇
  1983年   47篇
  1982年   37篇
  1980年   54篇
  1979年   31篇
  1974年   36篇
  1970年   31篇
  1968年   30篇
  1938年   60篇
  1934年   31篇
  1932年   57篇
  1930年   48篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.

Introduction  

This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning.  相似文献   
43.
Reported herein is a case of obsessive–compulsive disorder with persistent and distressing musical obsessions along with other symptoms. Advanced source analysis of electroencephalographic data indicated high spectral power over the bifrontal region. The musical symptoms were resistant to pharmacotherapy but there was some reduction in frequency and duration of musical obsessions with thought-stopping technique.  相似文献   
44.
45.
46.

Introduction  

Although ependymoma is the third most common pediatric brain tumor, we know little about the genetic/epigenetic basis of its initiation, maintenance, or progression. This is due in part to the heterogeneity of the disease, as well as the small sample size of the cohorts analyzed in most studies.  相似文献   
47.
48.
A benign esophageal leiomyoma with abnormally increased fluorine-18-fluorodeoxyglucose uptake on positron emission tomography (PET) was resected thoracoscopically. The tumor, of which the maximum standardized uptake value of the lesion was 4.7, was well defined and 38 mm in diameter. Neither mitotic activity nor degeneration was found histologically; and immunoreactivity for CD34, CD117, MIB-1, and glucose transporter-1 was negative immunohistochemically. A diagnosis of gastrointestinal stromal tumor was ruled out by an oncogenic kinase gene mutation study. This case cautions against PET-dependent evaluation for malignant potential of esophageal submucosal tumors.  相似文献   
49.
50.
Some investigators have suggested that preoperative chemotherapy for hepatic colorectal metastases may cause hepatic injury and increase perioperative morbidity and mortality. The objective of the current study was to examine whether treatment with preoperative chemotherapy was associated with hepatic injury of the nontumorous liver and whether such injury, if present, was associated with increased morbidity or mortality after hepatic resection. Two-hundred and twelve eligible patients who underwent hepatic resection for colorectal liver metastases between January 1999 and December 2005 were identified. Data on demographics, clinicopathologic characteristics, and preoperative chemotherapy details were collected and analyzed. The majority of patients received preoperative chemotherapy (n = 153; 72.2%). Chemotherapy consisted of fluoropyrimidine-based regimens: 5-FU monotherapy, 31.6%; irinotecan, 25.9%; and oxaliplatin, 14.6%. Among those patients who received chemotherapy, the type of chemotherapy regimen predicted distinct patterns of liver injury. Oxaliplatin was associated with increased likelihood of grade 3 sinusoidal dilatation (p = 0.017). Steatosis >30% was associated with irinotecan (27.3%) compared with no chemotherapy, 5-FU monotherapy, and oxaliplatin (all p < 0.05). Irinotecan also was associated with steatohepatitis, as two of the three patients with steatohepatitis had received irinotecan preoperatively. Overall, the perioperative complication rate was similar between the no-chemotherapy group (30.5%) and the chemotherapy group (35.3%) (p = 0.79). Preoperative chemotherapy was also not associated with 60-day mortality. In patients with hepatic colorectal metastases, preoperative chemotherapy is associated with hepatic injury in about 20 to 30% of patients. Furthermore, the type of hepatic injury after preoperative chemotherapy was regimen-specific. Presented at the American Hepato-Pancreato-Biliary Association 2006 Annual Meeting, March 11, Miami, Florida.  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