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   2416301篇
  免费   180079篇
  国内免费   3753篇
耳鼻咽喉   32993篇
儿科学   77556篇
妇产科学   63747篇
基础医学   357296篇
口腔科学   65534篇
临床医学   218245篇
内科学   471935篇
皮肤病学   52961篇
神经病学   192193篇
特种医学   90944篇
外国民族医学   489篇
外科学   365907篇
综合类   48060篇
现状与发展   12篇
一般理论   1030篇
预防医学   187443篇
眼科学   55717篇
药学   179341篇
  9篇
中国医学   4687篇
肿瘤学   134034篇
  2021年   21334篇
  2019年   21608篇
  2018年   29562篇
  2017年   22155篇
  2016年   24655篇
  2015年   27700篇
  2014年   39026篇
  2013年   57784篇
  2012年   80314篇
  2011年   85271篇
  2010年   50325篇
  2009年   47385篇
  2008年   79441篇
  2007年   84094篇
  2006年   84852篇
  2005年   82250篇
  2004年   78374篇
  2003年   75420篇
  2002年   72691篇
  2001年   109195篇
  2000年   111809篇
  1999年   94003篇
  1998年   27660篇
  1997年   24226篇
  1996年   24499篇
  1995年   23155篇
  1994年   21248篇
  1993年   20079篇
  1992年   72258篇
  1991年   70316篇
  1990年   68629篇
  1989年   65878篇
  1988年   60530篇
  1987年   59333篇
  1986年   55440篇
  1985年   53234篇
  1984年   39596篇
  1983年   33646篇
  1982年   20129篇
  1979年   35989篇
  1978年   25795篇
  1977年   21371篇
  1976年   20435篇
  1975年   21925篇
  1974年   26261篇
  1973年   24901篇
  1972年   23286篇
  1971年   22104篇
  1970年   20305篇
  1969年   19358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