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   211453篇
  免费   3042篇
  国内免费   138篇
耳鼻咽喉   1639篇
儿科学   8727篇
妇产科学   3625篇
基础医学   20912篇
口腔科学   2567篇
临床医学   15009篇
内科学   37215篇
皮肤病学   1765篇
神经病学   18581篇
特种医学   9996篇
外科学   34164篇
综合类   3548篇
一般理论   17篇
预防医学   19911篇
眼科学   4087篇
药学   13177篇
中国医学   972篇
肿瘤学   18721篇
  2023年   282篇
  2022年   772篇
  2021年   1597篇
  2020年   881篇
  2019年   977篇
  2018年   22965篇
  2017年   18072篇
  2016年   20541篇
  2015年   2174篇
  2014年   2683篇
  2013年   2911篇
  2012年   9875篇
  2011年   23685篇
  2010年   20384篇
  2009年   12745篇
  2008年   21261篇
  2007年   23478篇
  2006年   2320篇
  2005年   3725篇
  2004年   4804篇
  2003年   5556篇
  2002年   3526篇
  2001年   1023篇
  2000年   1099篇
  1999年   737篇
  1998年   453篇
  1997年   406篇
  1996年   301篇
  1995年   279篇
  1994年   246篇
  1993年   185篇
  1992年   383篇
  1991年   416篇
  1990年   477篇
  1989年   402篇
  1988年   335篇
  1987年   278篇
  1986年   255篇
  1985年   256篇
  1984年   192篇
  1983年   142篇
  1982年   92篇
  1981年   75篇
  1980年   108篇
  1979年   111篇
  1978年   79篇
  1977年   90篇
  1976年   73篇
  1974年   73篇
  1970年   67篇
排序方式: 共有10000条查询结果,搜索用时 453 毫秒
81.
82.

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   
83.
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   
84.
85.
86.

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   
87.
88.
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   
89.
90.
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