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   2484209篇
  免费   180405篇
  国内免费   3625篇
耳鼻咽喉   34598篇
儿科学   81086篇
妇产科学   66326篇
基础医学   367680篇
口腔科学   67873篇
临床医学   221704篇
内科学   481124篇
皮肤病学   55664篇
神经病学   198107篇
特种医学   95293篇
外国民族医学   514篇
外科学   376208篇
综合类   48404篇
现状与发展   12篇
一般理论   886篇
预防医学   189203篇
眼科学   58168篇
药学   185105篇
  9篇
中国医学   4879篇
肿瘤学   135396篇
  2021年   20084篇
  2019年   20686篇
  2018年   29539篇
  2017年   22387篇
  2016年   25556篇
  2015年   28717篇
  2014年   39351篇
  2013年   58543篇
  2012年   81895篇
  2011年   86217篇
  2010年   51056篇
  2009年   47751篇
  2008年   81186篇
  2007年   86806篇
  2006年   87631篇
  2005年   85474篇
  2004年   81655篇
  2003年   78840篇
  2002年   76415篇
  2001年   112709篇
  2000年   115418篇
  1999年   97078篇
  1998年   28188篇
  1997年   24640篇
  1996年   24806篇
  1995年   23325篇
  1994年   21473篇
  1993年   20237篇
  1992年   73693篇
  1991年   71766篇
  1990年   70106篇
  1989年   67318篇
  1988年   61747篇
  1987年   60596篇
  1986年   56586篇
  1985年   54339篇
  1984年   40373篇
  1983年   34285篇
  1982年   20444篇
  1979年   37048篇
  1978年   26496篇
  1977年   21977篇
  1976年   20958篇
  1975年   22758篇
  1974年   27124篇
  1973年   25711篇
  1972年   24075篇
  1971年   22869篇
  1970年   21022篇
  1969年   20009篇
排序方式: 共有10000条查询结果,搜索用时 265 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