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   1081793篇
  免费   74085篇
  国内免费   1371篇
耳鼻咽喉   15091篇
儿科学   34871篇
妇产科学   28755篇
基础医学   154668篇
口腔科学   29860篇
临床医学   95897篇
内科学   205162篇
皮肤病学   24557篇
神经病学   82046篇
特种医学   43253篇
外国民族医学   201篇
外科学   164237篇
综合类   21903篇
现状与发展   1篇
一般理论   267篇
预防医学   75477篇
眼科学   24711篇
药学   86612篇
  7篇
中国医学   2817篇
肿瘤学   66856篇
  2019年   7856篇
  2018年   11423篇
  2017年   9004篇
  2016年   10208篇
  2015年   11392篇
  2014年   15443篇
  2013年   22526篇
  2012年   30928篇
  2011年   32683篇
  2010年   19185篇
  2009年   18024篇
  2008年   30279篇
  2007年   32476篇
  2006年   33078篇
  2005年   31388篇
  2004年   30082篇
  2003年   28888篇
  2002年   27842篇
  2001年   60239篇
  2000年   61725篇
  1999年   51126篇
  1998年   12544篇
  1997年   11098篇
  1996年   11096篇
  1995年   10404篇
  1994年   9411篇
  1993年   8944篇
  1992年   38011篇
  1991年   36471篇
  1990年   35917篇
  1989年   34453篇
  1988年   30995篇
  1987年   30150篇
  1986年   28363篇
  1985年   26618篇
  1984年   19297篇
  1983年   16222篇
  1982年   8908篇
  1979年   17152篇
  1978年   11478篇
  1977年   10300篇
  1976年   8917篇
  1975年   10131篇
  1974年   11725篇
  1973年   11347篇
  1972年   10837篇
  1971年   10178篇
  1970年   9326篇
  1969年   9003篇
  1968年   7961篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
11.
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   
12.
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   
13.
14.
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   
15.
16.
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