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   2555893篇
  免费   184503篇
  国内免费   5016篇
耳鼻咽喉   35658篇
儿科学   82745篇
妇产科学   68946篇
基础医学   378174篇
口腔科学   70296篇
临床医学   227059篇
内科学   493833篇
皮肤病学   57087篇
神经病学   202789篇
特种医学   97636篇
外国民族医学   514篇
外科学   385855篇
综合类   52786篇
现状与发展   12篇
一般理论   915篇
预防医学   194820篇
眼科学   60027篇
药学   191489篇
  10篇
中国医学   5551篇
肿瘤学   139210篇
  2021年   20617篇
  2019年   21241篇
  2018年   30398篇
  2017年   22994篇
  2016年   26130篇
  2015年   29467篇
  2014年   40364篇
  2013年   59786篇
  2012年   83659篇
  2011年   88135篇
  2010年   52261篇
  2009年   48869篇
  2008年   82944篇
  2007年   88709篇
  2006年   89446篇
  2005年   87001篇
  2004年   83097篇
  2003年   80186篇
  2002年   77658篇
  2001年   116609篇
  2000年   119471篇
  1999年   100494篇
  1998年   29512篇
  1997年   25625篇
  1996年   25344篇
  1995年   23838篇
  1994年   21953篇
  1993年   20699篇
  1992年   76127篇
  1991年   74274篇
  1990年   72299篇
  1989年   69648篇
  1988年   64077篇
  1987年   62831篇
  1986年   58694篇
  1985年   56370篇
  1984年   41714篇
  1983年   35447篇
  1982年   21090篇
  1979年   38309篇
  1978年   27256篇
  1977年   22580篇
  1976年   21544篇
  1975年   23539篇
  1974年   28016篇
  1973年   26634篇
  1972年   24965篇
  1971年   23705篇
  1970年   21771篇
  1969年   20770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.
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.
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   
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