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   1080021篇
  免费   73899篇
  国内免费   1365篇
耳鼻咽喉   15101篇
儿科学   34842篇
妇产科学   28891篇
基础医学   154386篇
口腔科学   29777篇
临床医学   95581篇
内科学   204779篇
皮肤病学   24620篇
神经病学   82062篇
特种医学   43206篇
外国民族医学   201篇
外科学   164109篇
综合类   21880篇
现状与发展   1篇
一般理论   270篇
预防医学   75137篇
眼科学   24622篇
药学   86581篇
  7篇
中国医学   2817篇
肿瘤学   66415篇
  2019年   7855篇
  2018年   11408篇
  2017年   8984篇
  2016年   10176篇
  2015年   11389篇
  2014年   15440篇
  2013年   22476篇
  2012年   30863篇
  2011年   32642篇
  2010年   19138篇
  2009年   17987篇
  2008年   30249篇
  2007年   32412篇
  2006年   32998篇
  2005年   31344篇
  2004年   30037篇
  2003年   28859篇
  2002年   27816篇
  2001年   60256篇
  2000年   61700篇
  1999年   51122篇
  1998年   12512篇
  1997年   11058篇
  1996年   11085篇
  1995年   10383篇
  1994年   9406篇
  1993年   8904篇
  1992年   37966篇
  1991年   36453篇
  1990年   35918篇
  1989年   34440篇
  1988年   31017篇
  1987年   30172篇
  1986年   28400篇
  1985年   26599篇
  1984年   19325篇
  1983年   16222篇
  1982年   8896篇
  1979年   17130篇
  1978年   11490篇
  1977年   10287篇
  1976年   8899篇
  1975年   10125篇
  1974年   11733篇
  1973年   11359篇
  1972年   10824篇
  1971年   10146篇
  1970年   9338篇
  1969年   8988篇
  1968年   7967篇
排序方式: 共有10000条查询结果,搜索用时 46 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