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   1074643篇
  免费   73320篇
  国内免费   1368篇
耳鼻咽喉   15020篇
儿科学   34713篇
妇产科学   28686篇
基础医学   153689篇
口腔科学   29588篇
临床医学   94941篇
内科学   203850篇
皮肤病学   24404篇
神经病学   81533篇
特种医学   43029篇
外国民族医学   201篇
外科学   163417篇
综合类   21699篇
现状与发展   2篇
一般理论   263篇
预防医学   74576篇
眼科学   24513篇
药学   86265篇
  7篇
中国医学   2823篇
肿瘤学   66112篇
  2019年   7785篇
  2018年   11333篇
  2017年   8932篇
  2016年   10122篇
  2015年   11298篇
  2014年   15324篇
  2013年   22249篇
  2012年   30652篇
  2011年   32406篇
  2010年   19001篇
  2009年   17871篇
  2008年   30064篇
  2007年   32154篇
  2006年   32808篇
  2005年   31153篇
  2004年   29823篇
  2003年   28684篇
  2002年   27657篇
  2001年   60076篇
  2000年   61527篇
  1999年   50965篇
  1998年   12470篇
  1997年   11013篇
  1996年   11029篇
  1995年   10338篇
  1994年   9349篇
  1993年   8875篇
  1992年   37819篇
  1991年   36307篇
  1990年   35777篇
  1989年   34320篇
  1988年   30892篇
  1987年   30012篇
  1986年   28237篇
  1985年   26469篇
  1984年   19195篇
  1983年   16122篇
  1982年   8826篇
  1979年   17055篇
  1978年   11411篇
  1977年   10238篇
  1976年   8843篇
  1975年   10079篇
  1974年   11664篇
  1973年   11286篇
  1972年   10760篇
  1971年   10106篇
  1970年   9259篇
  1969年   8941篇
  1968年   7922篇
排序方式: 共有10000条查询结果,搜索用时 15 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