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   1076332篇
  免费   73528篇
  国内免费   1363篇
耳鼻咽喉   15092篇
儿科学   34670篇
妇产科学   28676篇
基础医学   153807篇
口腔科学   29675篇
临床医学   95261篇
内科学   204071篇
皮肤病学   24432篇
神经病学   81815篇
特种医学   43023篇
外国民族医学   201篇
外科学   163437篇
综合类   21797篇
现状与发展   1篇
一般理论   265篇
预防医学   75036篇
眼科学   24569篇
药学   86376篇
  7篇
中国医学   2813篇
肿瘤学   66199篇
  2019年   7827篇
  2018年   11357篇
  2017年   8954篇
  2016年   10151篇
  2015年   11322篇
  2014年   15347篇
  2013年   22356篇
  2012年   30737篇
  2011年   32503篇
  2010年   19063篇
  2009年   17911篇
  2008年   30123篇
  2007年   32230篇
  2006年   32898篇
  2005年   31202篇
  2004年   29911篇
  2003年   28700篇
  2002年   27702篇
  2001年   60119篇
  2000年   61589篇
  1999年   51011篇
  1998年   12490篇
  1997年   11035篇
  1996年   11045篇
  1995年   10348篇
  1994年   9364篇
  1993年   8877篇
  1992年   37845篇
  1991年   36351篇
  1990年   35826篇
  1989年   34352篇
  1988年   30937篇
  1987年   30046篇
  1986年   28264篇
  1985年   26505篇
  1984年   19221篇
  1983年   16143篇
  1982年   8839篇
  1979年   17068篇
  1978年   11444篇
  1977年   10249篇
  1976年   8854篇
  1975年   10094篇
  1974年   11676篇
  1973年   11299篇
  1972年   10769篇
  1971年   10121篇
  1970年   9265篇
  1969年   8954篇
  1968年   7934篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
11.
12.
Proceedings of the National Academy of Sciences, India Section B: Biological Sciences - Heavy metal concentrations in surface soils of Reserved Forests (RFs) have a significant impact on...  相似文献   
13.
Colorectal cancer (CRC) is the third most diagnosed cancer and the second leading cause of cancer-related mortality in the United States. Across the globe, people in the age group older than 50 are at a higher risk of CRC. Genetic and environmental risk factors play a significant role in the development of CRC. If detected early, CRC is preventable and treatable. Currently, available screening methods and therapies for CRC treatment reduce the incidence rate among the population, but the micrometastasis of cancer may lead to recurrence. Therefore, the challenge is to develop an alternative therapy to overcome this complication. Nanotechnology plays a vital role in cancer treatment and offers targeted chemotherapies directly and selectively to cancer cells, with enhanced therapeutic efficacy. Additionally, nanotechnology elevates the chances of patient survival in comparison to traditional chemotherapies. The potential of nanoparticles includes that they may be used simultaneously for diagnosis and treatment. These exciting properties of nanoparticles have enticed researchers worldwide to unveil their use in early CRC detection and as effective treatment. This review discusses contemporary methods of CRC screening and therapies for CRC treatment, while the primary focus is on the theranostic approach of nanotechnology in CRC treatment and its prospects. In addition, this review aims to provide knowledge on the advancement of nanotechnology in CRC and as a starting point for researchers to think about new therapeutic approaches using nanotechnology.  相似文献   
14.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36 weeks gestational age)...  相似文献   
15.
16.
ABSTRACT

Objective: Dry eye is reported to be associated with several neurological diseases. The aim of this study is to evaluate the patients with hemiplegia after stroke for dry eye and compare their results with a control group.

Materials and methods: Forty-five patients with hemiplegia and 45 individuals as the control group were included in the study. Tear function tests (Schirmer and tear breakup time) and a dry eye questionnaire for dry eye symptoms (ocular surface disease index) were performed and the results of the two groups were compared.

Results: Schirmer test results were significantly lower in the post-stroke hemiplegia group compared to the control group (11.3 ± 8.2 mm and 20.6 ± 11.6 mm, respectively, p < .001). Tear breakup time results were significantly lower in the post-stroke hemiplegia group compared to the control group (7.9 ± 3.1 s and 12.1 ± 4.3 s, respectively, p < .001). Ocular surface disease index scores were not significantly different between hemiplegia and control groups (21.6 ± 20.0 and 19.8 ± 13.9, respectively, p = .635). Schirmer scores lower than 10 mm (60% and 30%, p < .001) and tear breakup time results lower than 10 s (65.6% and 28.9%, p < .001) were also higher in the hemiplegia group compared to control group.

Conclusion: We found lower Schirmer test and tear breakup time results and similar OSDI scores in hemiplegia patients compared to controls. Hemiplegia patients may have dry eye without typical symptoms. This should be taken into consideration in the follow-up and rehabilitation of post-stroke hemiplegia patients.  相似文献   
17.
18.
19.
20.
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