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   2481376篇
  免费   183962篇
  国内免费   3833篇
耳鼻咽喉   34040篇
儿科学   79866篇
妇产科学   65575篇
基础医学   366172篇
口腔科学   66721篇
临床医学   224861篇
内科学   484707篇
皮肤病学   53791篇
神经病学   199210篇
特种医学   92610篇
外国民族医学   500篇
外科学   373155篇
综合类   49410篇
现状与发展   13篇
一般理论   1029篇
预防医学   193483篇
眼科学   58017篇
药学   183985篇
  11篇
中国医学   4741篇
肿瘤学   137274篇
  2021年   21081篇
  2019年   21556篇
  2018年   29590篇
  2017年   22156篇
  2016年   24895篇
  2015年   28182篇
  2014年   39788篇
  2013年   59932篇
  2012年   82909篇
  2011年   88346篇
  2010年   52155篇
  2009年   49262篇
  2008年   83064篇
  2007年   88560篇
  2006年   88947篇
  2005年   86624篇
  2004年   82753篇
  2003年   79816篇
  2002年   77159篇
  2001年   110057篇
  2000年   112415篇
  1999年   94846篇
  1998年   28731篇
  1997年   25166篇
  1996年   25378篇
  1995年   23957篇
  1994年   22043篇
  1993年   20800篇
  1992年   72923篇
  1991年   70937篇
  1990年   69143篇
  1989年   66390篇
  1988年   61024篇
  1987年   59753篇
  1986年   55947篇
  1985年   53805篇
  1984年   40314篇
  1983年   34381篇
  1982年   21151篇
  1979年   36563篇
  1978年   26430篇
  1977年   21929篇
  1976年   20945篇
  1975年   22320篇
  1974年   26685篇
  1973年   25227篇
  1972年   23525篇
  1971年   22315篇
  1970年   20466篇
  1969年   19522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.
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   
6.
7.
PurposeUnderstanding the value of genetic screening and testing for monogenic disorders requires high-quality, methodologically robust economic evaluations. This systematic review sought to assess the methodological quality among such studies and examined opportunities for improvement.MethodsWe searched PubMed, Cochrane, Embase, and Web of Science for economic evaluations of genetic screening/testing (2013-2019). Methodological rigor and adherence to best practices were systematically assessed using the British Medical Journal checklist.ResultsAcross the 47 identified studies, there were substantial variations in modeling approaches, reporting detail, and sophistication. Models ranged from simple decision trees to individual-level microsimulations that compared between 2 and >20 alternative interventions. Many studies failed to report sufficient detail to enable replication or did not justify modeling assumptions, especially for costing methods and utility values. Meta-analyses, systematic reviews, or calibration were rarely used to derive parameter estimates. Nearly all studies conducted some sensitivity analysis, and more sophisticated studies implemented probabilistic sensitivity/uncertainty analysis, threshold analysis, and value of information analysis.ConclusionWe describe a heterogeneous body of work and present recommendations and exemplar studies across the methodological domains of (1) perspective, scope, and parameter selection; (2) use of uncertainty/sensitivity analyses; and (3) reporting transparency for improvement in the economic evaluation of genetic screening/testing.  相似文献   
8.
9.
Bone mineral density (BMD) is a highly heritable predictor of osteoporotic fracture. GWAS have identified hundreds of loci influencing BMD, but few have been functionally analyzed. In this study, we show that SNPs within a BMD locus on chromosome 14q32.32 alter splicing and expression of PAR-1a/microtubule affinity regulating kinase 3 (MARK3), a conserved serine/threonine kinase known to regulate bioenergetics, cell division, and polarity. Mice lacking Mark3 either globally or selectively in osteoblasts have increased bone mass at maturity. RNA profiling from Mark3-deficient osteoblasts suggested changes in the expression of components of the Notch signaling pathway. Mark3-deficient osteoblasts exhibited greater matrix mineralization compared with controls that was accompanied by reduced Jag1/Hes1 expression and diminished downstream JNK signaling. Overexpression of Jag1 in Mark3-deficient osteoblasts both in vitro and in vivo normalized mineralization capacity and bone mass, respectively. Together, these findings reveal a mechanism whereby genetically regulated alterations in Mark3 expression perturb cell signaling in osteoblasts to influence bone mass.  相似文献   
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