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   16579篇
  免费   790篇
  国内免费   257篇
耳鼻咽喉   505篇
儿科学   720篇
妇产科学   184篇
基础医学   1802篇
口腔科学   551篇
临床医学   1040篇
内科学   2660篇
皮肤病学   723篇
神经病学   1446篇
特种医学   1471篇
外科学   3135篇
综合类   988篇
现状与发展   1篇
预防医学   547篇
眼科学   448篇
药学   668篇
  2篇
中国医学   267篇
肿瘤学   468篇
  2024年   24篇
  2023年   148篇
  2022年   362篇
  2021年   495篇
  2020年   269篇
  2019年   447篇
  2018年   531篇
  2017年   424篇
  2016年   266篇
  2015年   255篇
  2014年   402篇
  2013年   569篇
  2012年   293篇
  2011年   328篇
  2010年   318篇
  2009年   327篇
  2008年   460篇
  2007年   454篇
  2006年   324篇
  2005年   249篇
  2004年   275篇
  2003年   431篇
  2002年   1273篇
  2001年   1595篇
  2000年   1796篇
  1999年   1150篇
  1998年   1132篇
  1997年   1022篇
  1996年   583篇
  1995年   270篇
  1994年   128篇
  1993年   99篇
  1992年   88篇
  1991年   78篇
  1990年   76篇
  1989年   83篇
  1988年   56篇
  1987年   47篇
  1986年   34篇
  1985年   65篇
  1984年   75篇
  1983年   52篇
  1982年   52篇
  1981年   41篇
  1980年   43篇
  1979年   26篇
  1978年   20篇
  1977年   32篇
  1976年   18篇
  1973年   12篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.

Background

There were few studies assessed the postoperative sarcopenia in patients with cancers. The objective of present study was to assess whether postoperative development of sarcopenia could predict a poor prognosis in patients with adenocarcinoma of esophagogastric junction, (AEG) and upper gastric cancer (UGC).

Methods

Patients with AEG and UGC who were judged as non-sarcopenic before surgery were reassessed the presence of postoperative development of sarcopenia 6 months after surgery. Patients were divided into the development group or non-development group, and clinicopathological factors and prognosis between these two groups were analyzed.

Results

The 5-year overall survival rates were significantly poorer in the development group than non-development group (68.0% vs. 92.6%, P?=?0.0118). Multivariate analyses showed that postoperative development of sarcopenia was an independent prognostic factor for poor overall survival (P?=?0.0237).

Conclusions

Postoperative development of sarcopenia was associated with a poor prognosis in patients with AEG and UGC.  相似文献   
6.
《Drug discovery today》2022,27(6):1733-1742
Compounds that exhibit assay interference or undesirable mechanisms of bioactivity are routinely encountered in assays at various stages of drug discovery. We observed that assays for the investigation of thiol-reactive and redox-active compounds have not been collected in a comprehensive review. Here, we review these assays and subject them to experimental optimization to improve their reliability. We demonstrate the usefulness of our assay cascade by assaying a library of bioactive compounds, chemical probes, and a set of approved drugs. These high-throughput assays should complement the array of wet-lab and in silico assays during the initial stages of hit discovery campaigns to pursue only hit compounds with tractable mechanisms of action.  相似文献   
7.
8.
9.
BackgroundWomen suffering from kidney disease are more prone to fertility problems, due to uremia. Fortunately, their fertility rate increases dramatically after renal transplantation. This study analyzes the predictors/risk factors of successful pregnancy with live birth outcome while presenting an overview of the 7-year experience of a single center.MethodsThis retrospective cohort study includes 239 women of reproductive age (18–40 years) who underwent renal transplantation in a tertiary Turkish clinic between October 1, 2011, and August 24, 2017. The subjects were invited to take part in a survey questioning their obstetric characteristics and they were assessed in 2 groups: fertile and infertile. Multivariable linear regression analysis was conducted to determine the predictors of a successful pregnancy.ResultsThirty-five 35 patients wished to become pregnant: 12 got pregnant spontaneously, while 21 failed to become pregnant (spontaneously). The mean age of the patients at the survey was 34 ± 7. Regular menstrual cycles after renal transplantation, tacrolimus-mycophenolate mofetil maintenance protocol, and age at transplantation were found to be predictors of spontaneous pregnancy. The duration of peritoneal dialysis was significantly longer in the infertile group (48 vs 12 months).ConclusionEnd-stage renal disease's negative impacts, including menstrual abnormality and fertility problems, can be overcome by successful kidney transplantation with appropriate immunosuppression. Minimizing the duration of peritoneal dialysis, particularly in patients who desire future fertility, may be accepted as a logical management strategy.  相似文献   
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