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   6223篇
  免费   374篇
  国内免费   28篇
耳鼻咽喉   38篇
儿科学   241篇
妇产科学   154篇
基础医学   1007篇
口腔科学   78篇
临床医学   438篇
内科学   1099篇
皮肤病学   193篇
神经病学   634篇
特种医学   260篇
外国民族医学   5篇
外科学   844篇
综合类   42篇
预防医学   300篇
眼科学   180篇
药学   437篇
  2篇
中国医学   1篇
肿瘤学   672篇
  2023年   40篇
  2022年   35篇
  2021年   85篇
  2020年   68篇
  2019年   82篇
  2018年   108篇
  2017年   82篇
  2016年   116篇
  2015年   134篇
  2014年   173篇
  2013年   217篇
  2012年   280篇
  2011年   306篇
  2010年   169篇
  2009年   188篇
  2008年   302篇
  2007年   249篇
  2006年   276篇
  2005年   289篇
  2004年   252篇
  2003年   259篇
  2002年   221篇
  2001年   234篇
  2000年   211篇
  1999年   190篇
  1998年   97篇
  1997年   87篇
  1996年   73篇
  1995年   48篇
  1994年   64篇
  1993年   46篇
  1992年   106篇
  1991年   94篇
  1990年   91篇
  1989年   87篇
  1988年   94篇
  1987年   89篇
  1986年   78篇
  1985年   64篇
  1984年   48篇
  1983年   47篇
  1982年   35篇
  1979年   58篇
  1978年   35篇
  1975年   35篇
  1974年   41篇
  1973年   36篇
  1972年   33篇
  1971年   32篇
  1966年   46篇
排序方式: 共有6625条查询结果,搜索用时 62 毫秒
1.
2.
3.
4.
Occupational diseases Nos. 2108 and 2110 correspond to intervertebral disc-related diseases of the lumbar spine from many years of carrying or lifting heavy loads, occupations in extreme postures of full flexion or oscillation of the whole body when seated, and which compel the cessation of all activities which are or could be the cause for the origin, exacerbation or recurrence of the disease. These occupational diseases came into force at the start of 1993, but there have been considerable problems in their implementation. The present Part I of the contribution is the result of the work of an interdisciplinary study group and contains medical criteria for the assessment of possibly strain-related clinical characteristics and the evaluation of other possible causes. Part II is to be published in Volume 4/2005 and will deal with questions related to forced cessation and to the assessment of the loss of earning ability. Agreement was reached in many areas related to the assessment of occupational claims. This should allow for evidence-based decision making in the future for the occupational diseases Nos. 2108 and 2110.  相似文献   
5.
6.
7.
8.
Reduction of transmission of human immunodeficiency virus type 1 (HIV-1) through human milk is needed. Alkyl sulfates such as sodium dodecyl sulfate (SDS) are microbicidal against HIV-1 at low concentrations, have little to no toxicity, and are inexpensive. The authors have reported that treatment of HIV-1-infected human milk with < or = 1% (10 mg/mL) SDS for 10 minutes inactivates cell-free and cell-associated virus. The SDS can be removed with a commercially available resin after treatment without recovery of viral infectivity. In this article, the authors report results of selective biochemical analyses (ie, protein, immunoglobulins, lipids, cells, and electrolytes) of human milk subjected to SDS treatment and removal. The SDS treatment or removal had no significant effects on the milk components studied. Therefore, the use of alkyl sulfate microbicides to treat milk from HIV-1-positive women may be a simple, practical, and nutritionally sound way to prevent or reduce transmission of HIV-1 while still feeding with mother's own milk.  相似文献   
9.
Intravenous ganciclovir is the standard treatment for cytomegalovirus disease in solid organ transplant recipients. Oral valganciclovir is a more convenient alternative. In a randomized, international trial, recipients with cytomegalovirus disease were treated with either 900 mg oral valganciclovir or 5 mg/kg i.v. ganciclovir twice daily for 21 days, followed by 900 mg daily valganciclovir for 28 days. A total of 321 patients were evaluated (valganciclovir [n = 164]; i.v. ganciclovir [n = 157]). The success rate of viremia eradication at Day 21 was 45.1% for valganciclovir and 48.4% for ganciclovir (95% CI -14.0% to +8.0%), and at Day 49; 67.1% and 70.1%, respectively (p = NS). Treatment success, as assessed by investigators, was 77.4% versus 80.3% at Day 21 and 85.4% versus 84.1% at Day 49 (p = NS). Baseline viral loads were not different between groups and decreased exponentially with similar half-lives and median time to eradication (21 vs. 19 days, p = 0.076). Side-effects and discontinuations of assigned treatment (18 of 321 patients) were comparable. Oral valganciclovir shows comparable safety and is not inferior to i.v. ganciclovir for treatment of cytomegalovirus disease in organ transplant recipients and provides a simpler treatment strategy, but care should be taken in extrapolating to organ transplant recipients not properly represented in the present study.  相似文献   
10.
The first part of this serial paper dealt with the medical criteria used in evaluation of the clinical picture caused by physical stress and the evaluation of other candidate causes and was published in issue no. 3/2005 (pp. 711–752) of Trauma and Berufskrankheit. This follow-up paper (II) presents criteria to be used in the evaluation of whether it is necessary to give up the occupations putting the spine at risk and in estimation of the degree of disability.  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