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   2433379篇
  免费   181186篇
  国内免费   3895篇
耳鼻咽喉   33304篇
儿科学   77822篇
妇产科学   64084篇
基础医学   359619篇
口腔科学   65979篇
临床医学   219748篇
内科学   475214篇
皮肤病学   53444篇
神经病学   193296篇
特种医学   91930篇
外国民族医学   489篇
外科学   368154篇
综合类   48658篇
现状与发展   13篇
一般理论   1044篇
预防医学   188318篇
眼科学   56323篇
药学   180755篇
  9篇
中国医学   4848篇
肿瘤学   135409篇
  2021年   22015篇
  2019年   22071篇
  2018年   30145篇
  2017年   22575篇
  2016年   25197篇
  2015年   28402篇
  2014年   39896篇
  2013年   58733篇
  2012年   81809篇
  2011年   86694篇
  2010年   51144篇
  2009年   48111篇
  2008年   80454篇
  2007年   85071篇
  2006年   85778篇
  2005年   83138篇
  2004年   79091篇
  2003年   75969篇
  2002年   73163篇
  2001年   109585篇
  2000年   112178篇
  1999年   94284篇
  1998年   27766篇
  1997年   24314篇
  1996年   24555篇
  1995年   23213篇
  1994年   21316篇
  1993年   20127篇
  1992年   72363篇
  1991年   70425篇
  1990年   68711篇
  1989年   65969篇
  1988年   60613篇
  1987年   59433篇
  1986年   55503篇
  1985年   53296篇
  1984年   39646篇
  1983年   33693篇
  1982年   20153篇
  1979年   36035篇
  1978年   25818篇
  1977年   21399篇
  1976年   20455篇
  1975年   21953篇
  1974年   26284篇
  1973年   24924篇
  1972年   23312篇
  1971年   22131篇
  1970年   20315篇
  1969年   19358篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional...  相似文献   
2.
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   
3.
4.
5.
6.
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   
7.
Journal of Medical Ultrasonics - Chronic liver disease is still a major problem because disease progression will ultimately lead to liver cirrhosis. Portal hypertension is the hallmark in advanced...  相似文献   
8.
9.
10.
The coronavirus disease 2019 (COVID-19) pandemic has rapidly created widespread impacts on global health and the economy. Data suggest that women are less susceptible to severe illness. However, sex-disaggregated data are incomplete, leaving room for misinterpretation, and focusing only on biologic sex underestimates the gendered impact of the pandemic on women. This narrative review summarizes what is known about gender disparities during the COVID-19 pandemic and the economic, domestic, and health burdens along with overlapping vulnerabilities related to the pandemic. In addition, this review outlines recommended strategies that advocacy groups, community leaders, and policymakers should implement to mitigate the widening gender disparities related to COVID-19.  相似文献   
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