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   1670篇
  免费   185篇
  国内免费   28篇
耳鼻咽喉   7篇
儿科学   152篇
妇产科学   30篇
基础医学   234篇
口腔科学   94篇
临床医学   168篇
内科学   295篇
皮肤病学   50篇
神经病学   50篇
特种医学   173篇
外科学   233篇
综合类   47篇
预防医学   110篇
眼科学   43篇
药学   73篇
中国医学   7篇
肿瘤学   117篇
  2023年   15篇
  2022年   17篇
  2021年   24篇
  2020年   18篇
  2019年   8篇
  2018年   48篇
  2017年   51篇
  2016年   45篇
  2015年   68篇
  2014年   89篇
  2013年   117篇
  2012年   59篇
  2011年   40篇
  2010年   83篇
  2009年   99篇
  2008年   34篇
  2007年   57篇
  2006年   57篇
  2005年   32篇
  2004年   32篇
  2003年   15篇
  2002年   24篇
  2001年   17篇
  2000年   13篇
  1999年   26篇
  1998年   103篇
  1997年   87篇
  1996年   98篇
  1995年   63篇
  1994年   75篇
  1993年   39篇
  1992年   14篇
  1991年   24篇
  1990年   16篇
  1989年   32篇
  1988年   32篇
  1987年   30篇
  1986年   26篇
  1985年   25篇
  1984年   14篇
  1983年   12篇
  1982年   23篇
  1981年   15篇
  1980年   16篇
  1979年   5篇
  1978年   6篇
  1977年   10篇
  1976年   13篇
  1975年   9篇
  1973年   2篇
排序方式: 共有1883条查询结果,搜索用时 15 毫秒
111.
112.

Background  

Despite large-scale investments in mental health care in the community since the 1990 s, a trend towards reinstitutionalization has been visible since 2002. Since many mental health care providers regard this as an undesirable trend, the question arises: In the coming 5 years, what types of residence should be organized for people with mental health problems? The purpose of this article is to provide mental health care providers, public housing corporations, and local government with guidelines for planning organizational strategy concerning types of residence for people with mental health problems.  相似文献   
113.

Background

Many patients are referred to labour ward as emergencies, and therefore do not benefit from the antenatal HIV counselling and testing and treatment offered to registered patients.

Objective

To assess the acceptability and suitability of offering HIV counselling and testing to women of unknown HIV status presenting in labour.

Methods

A cross-sectional study comprising counselling and obtaining consent for HIV testing among 104 unregistered patients who presented in labour over a 3-month period. Rapid and enzyme-linked immunosorbent assay screening was performed for 90 consenting respondents. Reactive results were confirmed by Western blot. Appropriate therapy was instituted.

Results

Acceptance rate for HIV testing was 86.5%, prevalence of HIV was 6.7%. Women of lower educational status were more likely to accept testing in labour (OR: 0.3; 95% CI: 0.1–0.7; p=0.01); age, parity, occupation and knowledge of HIV had no influence. Most women (66.3%) had satisfactory knowledge of HIV. No one admitted to feeling coerced to test in fear of being denied care. Most refusals for screening were to avoid needle pricks (28.6%).Compared to ELISA screening test, specificity of the rapid test was 100%, sensitivity 85.7%, positive predictive value 100% and negative predictive value 98.8%. Attitude to testing was maintained on post-partum re-evaluation.

Conclusion

The prevalence of HIV amongst unregistered parturients showed the importance of offering point-of-care HIV testing and intervention, especially in an environment where antenatal clinic attendance is poor. Rapid testing appeared to be acceptable and feasible in labour to prevent the mother-to-child transmission of HIV.  相似文献   
114.

Background  

We examined which adaptive coping strategies, referring to the concept of 'locus of disease control', were of relevance for patients with chronic pain conditions, and how they were interconnected with patients' life satisfaction and interpretation of disease.  相似文献   
115.
116.
The inactive X (Xi) differs from its active homologue (Xa) in a number of ways, including increased methylation of CpG islands, replication late in S phase, underacetylation of histone H4 and association with XIST RNA. Global changes in DNA methylation occur relatively late in development, but the other properties all change during or shortly after the establishment of Xi and may play a role in the mechanism by which an inactive chromatin conformation spreads across most of the chromosome. In the present report, we use two human X;autosome translocation chromosomes to study the spreading of inactive X chromatin across X;autosome boundaries. In one of these chromosomes, t(X;6), Xp distal to p11.2 is replaced by 6p21.1-6pter and, in the other, ins(X;16), a small fragment derived from 16p13 is inserted into the distal third of Xq. In lymphoid cells from patients carrying these translocations in an unbalanced form, Xi was shown by HUMARA assay to be derived exclusively [t(X:6)] or predominantly [ins (X;16)] from the derived X chromosome. We used a combination of immunolabelling and RNA/DNA fluorescence in situ hybridization to define the distribution of XIST RNA, deacetylated H4 and late-replicating DNA across the two derived X chromosomes in inactive form. Within the limits of the cytogenetic techniques employed, the results show complete coincidence of these three parameters, with all three being excluded from the autosomal component of the derived X chromosome.   相似文献   
117.
118.
119.
120.
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