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   1073886篇
  免费   73262篇
  国内免费   1361篇
耳鼻咽喉   15017篇
儿科学   34625篇
妇产科学   28639篇
基础医学   153478篇
口腔科学   29597篇
临床医学   94960篇
内科学   203785篇
皮肤病学   24395篇
神经病学   81462篇
特种医学   42971篇
外国民族医学   201篇
外科学   163151篇
综合类   21715篇
现状与发展   1篇
一般理论   263篇
预防医学   74623篇
眼科学   24567篇
药学   86160篇
  7篇
中国医学   2808篇
肿瘤学   66084篇
  2019年   7775篇
  2018年   11307篇
  2017年   8920篇
  2016年   10108篇
  2015年   11277篇
  2014年   15286篇
  2013年   22228篇
  2012年   30595篇
  2011年   32338篇
  2010年   18974篇
  2009年   17836篇
  2008年   29983篇
  2007年   32097篇
  2006年   32735篇
  2005年   31062篇
  2004年   29748篇
  2003年   28573篇
  2002年   27543篇
  2001年   60030篇
  2000年   61481篇
  1999年   50933篇
  1998年   12446篇
  1997年   11003篇
  1996年   11015篇
  1995年   10323篇
  1994年   9343篇
  1993年   8860篇
  1992年   37792篇
  1991年   36283篇
  1990年   35749篇
  1989年   34293篇
  1988年   30869篇
  1987年   29991篇
  1986年   28219篇
  1985年   26457篇
  1984年   19194篇
  1983年   16117篇
  1982年   8826篇
  1979年   17035篇
  1978年   11404篇
  1977年   10230篇
  1976年   8838篇
  1975年   10068篇
  1974年   11655篇
  1973年   11274篇
  1972年   10756篇
  1971年   10093篇
  1970年   9253篇
  1969年   8938篇
  1968年   7917篇
排序方式: 共有10000条查询结果,搜索用时 203 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