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   2500005篇
  免费   181252篇
  国内免费   3707篇
耳鼻咽喉   34724篇
儿科学   81476篇
妇产科学   66769篇
基础医学   369878篇
口腔科学   68153篇
临床医学   223371篇
内科学   484752篇
皮肤病学   55885篇
神经病学   199685篇
特种医学   95638篇
外国民族医学   513篇
外科学   377988篇
综合类   48616篇
现状与发展   12篇
一般理论   891篇
预防医学   190840篇
眼科学   58349篇
药学   186226篇
  11篇
中国医学   4943篇
肿瘤学   136244篇
  2021年   20626篇
  2019年   21094篇
  2018年   29945篇
  2017年   22757篇
  2016年   25862篇
  2015年   29086篇
  2014年   39881篇
  2013年   59211篇
  2012年   82906篇
  2011年   87254篇
  2010年   51627篇
  2009年   48329篇
  2008年   82078篇
  2007年   87772篇
  2006年   88517篇
  2005年   86424篇
  2004年   82488篇
  2003年   79717篇
  2002年   77222篇
  2001年   112859篇
  2000年   115562篇
  1999年   97207篇
  1998年   28303篇
  1997年   24722篇
  1996年   24883篇
  1995年   23417篇
  1994年   21560篇
  1993年   20298篇
  1992年   73807篇
  1991年   71870篇
  1990年   70164篇
  1989年   67418篇
  1988年   61797篇
  1987年   60661篇
  1986年   56649篇
  1985年   54369篇
  1984年   40387篇
  1983年   34286篇
  1982年   20472篇
  1979年   37056篇
  1978年   26525篇
  1977年   22012篇
  1976年   20981篇
  1975年   22770篇
  1974年   27159篇
  1973年   25729篇
  1972年   24109篇
  1971年   22897篇
  1970年   21049篇
  1969年   20045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.
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   
6.
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   
7.
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