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   1074470篇
  免费   73414篇
  国内免费   1361篇
耳鼻咽喉   15014篇
儿科学   34642篇
妇产科学   28663篇
基础医学   153662篇
口腔科学   29574篇
临床医学   95011篇
内科学   203704篇
皮肤病学   24400篇
神经病学   81654篇
特种医学   43016篇
外国民族医学   201篇
外科学   163375篇
综合类   21816篇
现状与发展   1篇
一般理论   264篇
预防医学   74692篇
眼科学   24494篇
药学   86211篇
  7篇
中国医学   2805篇
肿瘤学   66039篇
  2019年   7789篇
  2018年   11325篇
  2017年   8927篇
  2016年   10117篇
  2015年   11280篇
  2014年   15300篇
  2013年   22263篇
  2012年   30643篇
  2011年   32373篇
  2010年   19010篇
  2009年   17881篇
  2008年   30051篇
  2007年   32164篇
  2006年   32790篇
  2005年   31117篇
  2004年   29817篇
  2003年   28634篇
  2002年   27594篇
  2001年   60075篇
  2000年   61528篇
  1999年   50968篇
  1998年   12461篇
  1997年   11012篇
  1996年   11040篇
  1995年   10339篇
  1994年   9352篇
  1993年   8872篇
  1992年   37827篇
  1991年   36295篇
  1990年   35780篇
  1989年   34333篇
  1988年   30901篇
  1987年   30021篇
  1986年   28252篇
  1985年   26494篇
  1984年   19225篇
  1983年   16142篇
  1982年   8831篇
  1979年   17058篇
  1978年   11419篇
  1977年   10242篇
  1976年   8853篇
  1975年   10084篇
  1974年   11669篇
  1973年   11293篇
  1972年   10768篇
  1971年   10101篇
  1970年   9263篇
  1969年   8944篇
  1968年   7935篇
排序方式: 共有10000条查询结果,搜索用时 959 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