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   389811篇
  免费   24679篇
  国内免费   2874篇
耳鼻咽喉   5294篇
儿科学   8370篇
妇产科学   10176篇
基础医学   54586篇
口腔科学   12056篇
临床医学   31119篇
内科学   80260篇
皮肤病学   8871篇
神经病学   28076篇
特种医学   14371篇
外国民族医学   82篇
外科学   62563篇
综合类   10120篇
现状与发展   1篇
一般理论   70篇
预防医学   17997篇
眼科学   9549篇
药学   31853篇
  1篇
中国医学   2219篇
肿瘤学   29730篇
  2021年   2872篇
  2019年   2970篇
  2018年   4827篇
  2017年   3672篇
  2016年   3788篇
  2015年   4255篇
  2014年   6027篇
  2013年   7823篇
  2012年   10733篇
  2011年   10996篇
  2010年   6609篇
  2009年   6184篇
  2008年   10061篇
  2007年   10900篇
  2006年   10799篇
  2005年   9794篇
  2004年   9254篇
  2003年   8963篇
  2002年   8621篇
  2001年   28403篇
  2000年   28952篇
  1999年   23850篇
  1998年   5283篇
  1997年   4320篇
  1996年   3901篇
  1995年   3561篇
  1994年   3169篇
  1993年   2892篇
  1992年   16194篇
  1991年   14937篇
  1990年   14288篇
  1989年   14087篇
  1988年   12677篇
  1987年   12164篇
  1986年   11213篇
  1985年   10421篇
  1984年   6977篇
  1983年   5645篇
  1982年   2753篇
  1979年   5521篇
  1978年   3378篇
  1977年   3013篇
  1975年   2668篇
  1974年   3105篇
  1973年   2899篇
  1972年   2860篇
  1971年   2807篇
  1970年   2534篇
  1969年   2578篇
  1968年   2279篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
Digestive Diseases and Sciences - To determine whether the presence of portal vein thrombosis (PVT) where venous flow within the liver may be altered may delay the diagnosis of HCC and be...  相似文献   
23.
ABSTRACT

Purpose

To investigate the effect of 1% tropicamide on anterior chamber aqueous flare (ACAF) measurements acquired with laser flare meter in patients with pseudoexfoliation.  相似文献   
24.
25.
Abstract

Purpose: We examined underlying psychosocial processes of a behavioral treatment for urinary incontinence (UI) of prostate cancer survivors.

Design: Secondary analysis of data collected from a clinical trial.

Sample: Two hundred forty-four prostate cancer survivors who participated in a clinical trial of behavioral intervention to UI as intervention or control subjects.

Methods: The participants had a 3-month behavioral intervention or usual care and were followed up for an additional 3?months. They were assessed at baseline, 3, and 6?months. Latent growth curve models were performed to examine trajectories of each study variable and relationships among the variables.

Findings: Increasing self-efficacy and social support were significantly and independently associated with more reduction of urinary leakage frequency over time.

Implications for psychosocial oncology: Providing problem-solving skills and social support, including peer support, are essential for empowering patients to reduce UI.  相似文献   
26.
27.
28.
Conclusion  Several quality-control measures take place before (patient and camera preparation) and during SPECT acquisition to achieve high-quality images. Not uncommonly, technologists and physicians are left with suboptimal images that have to be addressed to reach the “right answer” for patient diagnosis and hence management. In many cases patients may be reimaged, especially if the problem is detected early, but in other cases either the patient has left the nuclear laboratory or there is an inevitable problem that, even with reimaging, will not be resolved. In these situations the technologist and physician have to seek the available techniques to obtain the best images possible. These resources are discussed in this issue as an aid in quality control to obtain the best possible images.  相似文献   
29.
Background and Aims: Video capsule endoscopy (VCE) has become increasingly important as a simple method for observing the entire small intestine. The indications for VCE are obscure gastrointestinal bleeding and investigation of Crohn’s disease (CD). However, the correlation between endoscopic findings obtained by VCE and clinical findings in known cases of CD is not clear, and we therefore investigated this in the present study. Patients and methods: In 30 patients with known CD (Crohn’s disease activity index [CDAI] 0–420; median = 158.3), double contrast enteroclysis (ENT) was performed 1–3 weeks prior to VCE. The relationship between the VCE findings and hematological analysis/CDAI was examined. Results: In 17 of 30 patients, the entire small intestine could be investigated by VCE, whereas in the remaining 13 patients the terminal ileum could not be investigated. The following exhibited positive correlations: total lesions and CDAI (correlation coefficient values: rs = 0.661, adjusted P < 0.0061), ulcers and C‐reactive protein (CRP) (rs = 0.607, adjusted P < 0.0061), total lesions and CRP (rs = 0.604, adjusted P < 0.0061). Conclusions: Analysis with VCE suggests that CDAI and CRP indicate the activity of intestinal lesions in patients with known CD, and that CRP, in particular, is associated with the activity of ulcerative lesions of the intestine. This may contribute to revised guidelines for VCE in the future.  相似文献   
30.
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