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   431217篇
  免费   14669篇
  国内免费   859篇
耳鼻咽喉   4573篇
儿科学   13904篇
妇产科学   8295篇
基础医学   51974篇
口腔科学   9173篇
临床医学   30774篇
内科学   87654篇
皮肤病学   6664篇
神经病学   38432篇
特种医学   16746篇
外国民族医学   2篇
外科学   63261篇
综合类   3815篇
一般理论   221篇
预防医学   43640篇
眼科学   8912篇
药学   27963篇
中国医学   1417篇
肿瘤学   29325篇
  2023年   1585篇
  2022年   1904篇
  2021年   5882篇
  2020年   3282篇
  2019年   5701篇
  2018年   29205篇
  2017年   21964篇
  2016年   24301篇
  2015年   7187篇
  2014年   8544篇
  2013年   11658篇
  2012年   24345篇
  2011年   38516篇
  2010年   27600篇
  2009年   18674篇
  2008年   33746篇
  2007年   36262篇
  2006年   15432篇
  2005年   16617篇
  2004年   16644篇
  2003年   16654篇
  2002年   13970篇
  2001年   5930篇
  2000年   6518篇
  1999年   5152篇
  1998年   1871篇
  1997年   1419篇
  1996年   1164篇
  1995年   1094篇
  1992年   2703篇
  1991年   2478篇
  1990年   2465篇
  1989年   2120篇
  1988年   2004篇
  1987年   1869篇
  1986年   1936篇
  1985年   1841篇
  1984年   1466篇
  1983年   1276篇
  1979年   1412篇
  1978年   1049篇
  1975年   1069篇
  1974年   1328篇
  1973年   1338篇
  1972年   1264篇
  1971年   1217篇
  1970年   1147篇
  1969年   1201篇
  1968年   1236篇
  1967年   1062篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
2.
3.
Intratumor heterogeneity is a main cause of the dismal prognosis of glioblastoma (GBM). Yet, there remains a lack of a uniform assessment of the degree of heterogeneity. With a multiscale approach, we addressed the hypothesis that intratumor heterogeneity exists on different levels comprising traditional regional analyses, but also innovative methods including computer-assisted analysis of tumor morphology combined with epigenomic data. With this aim, 157 biopsies of 37 patients with therapy-naive IDH-wildtype GBM were analyzed regarding the intratumor variance of protein expression of glial marker GFAP, microglia marker Iba1 and proliferation marker Mib1. Hematoxylin and eosin stained slides were evaluated for tumor vascularization. For the estimation of pixel intensity and nuclear profiling, automated analysis was used. Additionally, DNA methylation profiling was conducted separately for the single biopsies. Scoring systems were established to integrate several parameters into one score for the four examined modalities of heterogeneity (regional, cellular, pixel-level and epigenomic). As a result, we could show that heterogeneity was detected in all four modalities. Furthermore, for the regional, cellular and epigenomic level, we confirmed the results of earlier studies stating that a higher degree of heterogeneity is associated with poorer overall survival. To integrate all modalities into one score, we designed a predictor of longer survival, which showed a highly significant separation regarding the OS. In conclusion, multiscale intratumor heterogeneity exists in glioblastoma and its degree has an impact on overall survival. In future studies, the implementation of a broadly feasible heterogeneity index should be considered.  相似文献   
4.
5.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  相似文献   
6.
7.
8.
9.
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   
10.
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