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   1803121篇
  免费   133070篇
  国内免费   2995篇
耳鼻咽喉   26060篇
儿科学   55572篇
妇产科学   49832篇
基础医学   257837篇
口腔科学   52101篇
临床医学   159303篇
内科学   340967篇
皮肤病学   38835篇
神经病学   141109篇
特种医学   72052篇
外国民族医学   370篇
外科学   277902篇
综合类   43307篇
现状与发展   3篇
一般理论   507篇
预防医学   134267篇
眼科学   42446篇
药学   140771篇
  7篇
中国医学   4078篇
肿瘤学   101860篇
  2018年   17374篇
  2016年   15519篇
  2015年   17671篇
  2014年   24680篇
  2013年   36650篇
  2012年   49886篇
  2011年   52611篇
  2010年   30822篇
  2009年   28982篇
  2008年   49083篇
  2007年   52926篇
  2006年   53322篇
  2005年   51466篇
  2004年   49890篇
  2003年   47917篇
  2002年   46254篇
  2001年   86915篇
  2000年   89037篇
  1999年   74781篇
  1998年   20105篇
  1997年   18080篇
  1996年   18060篇
  1995年   17122篇
  1994年   15949篇
  1993年   15071篇
  1992年   59458篇
  1991年   57645篇
  1990年   56611篇
  1989年   54593篇
  1988年   50145篇
  1987年   49103篇
  1986年   46441篇
  1985年   44254篇
  1984年   32982篇
  1983年   28167篇
  1982年   16564篇
  1981年   14800篇
  1979年   31510篇
  1978年   21984篇
  1977年   19151篇
  1976年   17047篇
  1975年   19014篇
  1974年   22881篇
  1973年   22010篇
  1972年   21007篇
  1971年   19643篇
  1970年   18411篇
  1969年   17893篇
  1968年   16006篇
  1967年   14543篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
22.
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   
23.
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   
24.
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   
25.
Cutaneous leiomyomas are rare benign smooth‐muscle tumors. These lesions are distinguished based on their cell of origin and are subclassified as pilar leiomyoma, angioleiomyoma, and genital‐type leiomyoma. Nipple leiomyoma is the least common genital‐type leiomyoma, arising from the dartoic muscle cell of the nipple. Histologic examination of the lesion is necessary for definitive diagnosis, and these uncommon tumors can pose a diagnostic challenge. We describe herein a series of six nipple leiomyomas with a spectrum of histologic appearances.  相似文献   
26.
27.
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   
28.
29.
30.
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