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   2417356篇
  免费   180080篇
  国内免费   3754篇
耳鼻咽喉   32995篇
儿科学   77565篇
妇产科学   63753篇
基础医学   357379篇
口腔科学   65541篇
临床医学   218331篇
内科学   472274篇
皮肤病学   52962篇
神经病学   192229篇
特种医学   90966篇
外国民族医学   489篇
外科学   365988篇
综合类   48107篇
现状与发展   12篇
一般理论   1030篇
预防医学   187590篇
眼科学   55764篇
药学   179400篇
  10篇
中国医学   4688篇
肿瘤学   134117篇
  2021年   21335篇
  2019年   21610篇
  2018年   29563篇
  2017年   22155篇
  2016年   24655篇
  2015年   27699篇
  2014年   39028篇
  2013年   57785篇
  2012年   80317篇
  2011年   85279篇
  2010年   50327篇
  2009年   47387篇
  2008年   79439篇
  2007年   84087篇
  2006年   84845篇
  2005年   82244篇
  2004年   78368篇
  2003年   75413篇
  2002年   72684篇
  2001年   109190篇
  2000年   111802篇
  1999年   93998篇
  1998年   27660篇
  1997年   24226篇
  1996年   24500篇
  1995年   23155篇
  1994年   21248篇
  1993年   20077篇
  1992年   72256篇
  1991年   70319篇
  1990年   68629篇
  1989年   65874篇
  1988年   60537篇
  1987年   59333篇
  1986年   55436篇
  1985年   53229篇
  1984年   39590篇
  1983年   33645篇
  1982年   20128篇
  1979年   35990篇
  1978年   25793篇
  1977年   21369篇
  1976年   20431篇
  1975年   21926篇
  1974年   26256篇
  1973年   24897篇
  1972年   23284篇
  1971年   22104篇
  1970年   20305篇
  1969年   19356篇
排序方式: 共有10000条查询结果,搜索用时 15 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