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   1076573篇
  免费   73438篇
  国内免费   1367篇
耳鼻咽喉   15052篇
儿科学   34684篇
妇产科学   28728篇
基础医学   153856篇
口腔科学   29659篇
临床医学   95197篇
内科学   204160篇
皮肤病学   24603篇
神经病学   81812篇
特种医学   43114篇
外国民族医学   204篇
外科学   163579篇
综合类   21721篇
现状与发展   1篇
一般理论   266篇
预防医学   74833篇
眼科学   24628篇
药学   86299篇
  7篇
中国医学   2806篇
肿瘤学   66169篇
  2019年   7785篇
  2018年   11339篇
  2017年   8958篇
  2016年   10150篇
  2015年   11344篇
  2014年   15347篇
  2013年   22285篇
  2012年   30682篇
  2011年   32447篇
  2010年   19033篇
  2009年   17904篇
  2008年   30055篇
  2007年   32203篇
  2006年   32817篇
  2005年   31166篇
  2004年   29829篇
  2003年   28666篇
  2002年   27646篇
  2001年   60122篇
  2000年   61567篇
  1999年   50991篇
  1998年   12478篇
  1997年   11040篇
  1996年   11042篇
  1995年   10359篇
  1994年   9370篇
  1993年   8876篇
  1992年   37833篇
  1991年   36320篇
  1990年   35801篇
  1989年   34341篇
  1988年   30916篇
  1987年   30042篇
  1986年   28273篇
  1985年   26496篇
  1984年   19225篇
  1983年   16141篇
  1982年   8839篇
  1979年   17058篇
  1978年   11420篇
  1977年   10249篇
  1976年   8853篇
  1975年   10092篇
  1974年   11676篇
  1973年   11291篇
  1972年   10779篇
  1971年   10112篇
  1970年   9278篇
  1969年   8958篇
  1968年   7940篇
排序方式: 共有10000条查询结果,搜索用时 15 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