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   3321166篇
  免费   272945篇
  国内免费   14303篇
耳鼻咽喉   45129篇
儿科学   106457篇
妇产科学   84851篇
基础医学   533036篇
口腔科学   90169篇
临床医学   298897篇
内科学   582346篇
皮肤病学   90329篇
神经病学   286712篇
特种医学   129205篇
外国民族医学   330篇
外科学   508281篇
综合类   100957篇
现状与发展   23篇
一般理论   2301篇
预防医学   282885篇
眼科学   75196篇
药学   226221篇
  23篇
中国医学   9639篇
肿瘤学   155427篇
  2021年   57044篇
  2020年   36347篇
  2019年   59631篇
  2018年   72950篇
  2017年   55686篇
  2016年   61574篇
  2015年   75746篇
  2014年   110559篇
  2013年   176521篇
  2012年   94252篇
  2011年   94440篇
  2010年   118731篇
  2009年   122677篇
  2008年   79863篇
  2007年   82188篇
  2006年   92739篇
  2005年   87540篇
  2004年   89199篇
  2003年   79761篇
  2002年   69121篇
  2001年   94704篇
  2000年   87163篇
  1999年   88931篇
  1998年   64691篇
  1997年   62682篇
  1996年   60392篇
  1995年   55895篇
  1994年   50141篇
  1993年   46664篇
  1992年   62480篇
  1991年   59548篇
  1990年   56659篇
  1989年   56015篇
  1988年   51683篇
  1987年   51083篇
  1986年   48200篇
  1985年   48689篇
  1984年   45336篇
  1983年   41602篇
  1982年   40765篇
  1981年   38547篇
  1980年   36249篇
  1979年   37088篇
  1978年   33782篇
  1977年   30982篇
  1976年   28486篇
  1975年   26818篇
  1974年   27594篇
  1973年   26536篇
  1972年   24648篇
排序方式: 共有10000条查询结果,搜索用时 0 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.

Physical activity brings significant health benefits to middle-aged adults, although the research to date has been focused on late adulthood. This study aims to examine how ageing affects the self-reported and accelerometer-derived measures of physical activity levels in middle-aged adults. We employed the data recorded in the UK Biobank and analysed the physical activity levels of 2,998 participants (1381 men and 1617 women), based on self-completion questionnaire and accelerometry measurement of physical activity. We also assessed the musculoskeletal health of the participants using the dual-energy X-ray absorptiometry (DXA) measurements provided by the UK Biobank. Participants were categorised into three groups according to their age: group I younger middle-aged (40 to 49 years), group II older middle-aged (50 to 59 years), and group III oldest middle-aged (60 to 69 years). Self-reported physical activity level increased with age and was the highest in group III, followed by group II and I (P?<?0.05). On the contrary, physical activity measured by accelerometry decreased significantly with age from group I to III (P?<?0.05), and the same pertained to the measurements of musculoskeletal health (P?<?0.05). It was also shown that middle-aged adults mostly engaged in low and moderate intensity activities. The opposing trends of the self-reported and measured physical activity levels may suggest that middle-aged adults over-report their activity level as they age. They should be aware of the difference between their perceived and actual physical activity levels, and objective measures would be useful to prevent the decline in musculoskeletal health.

  相似文献   
4.
5.

Interstitial lung disease (ILD) represents a significant cause of morbidity and mortality in systemic sclerosis (SSc). The purpose of this study was to examine recirculating lymphocytes from SSc patients for potential biomarkers of interstitial lung disease (ILD). Peripheral blood mononuclear cells (PBMCs) were isolated from patients with SSc and healthy controls enrolled in the Vanderbilt University Myositis and Scleroderma Treatment Initiative Center cohort between 9/2017–6/2019. Clinical phenotyping was performed by chart abstraction. Immunophenotyping was performed using both mass cytometry and fluorescence cytometry combined with t-distributed stochastic neighbor embedding analysis and traditional biaxial gating. This study included 34 patients with SSc-ILD, 14 patients without SSc-ILD, and 25 healthy controls. CD21lo/neg cells are significantly increased in SSc-ILD but not in SSc without ILD (15.4 ± 13.3% vs. 5.8 ± 0.9%, p = 0.002) or healthy controls (5.0 ± 0.5%, p < 0.0001). While CD21lo/neg B cells can be identified from a single biaxial gate, tSNE analysis reveals that the biaxial gate is comprised of multiple distinct subsets, all of which are increased in SSc-ILD. CD21lo/neg cells in both healthy controls and SSc-ILD are predominantly tBET positive and do not have intracellular CD21. Immunohistochemistry staining demonstrated that CD21lo/neg B cells diffusely infiltrate the lung parenchyma of an SSc-ILD patient. Additional work is needed to validate this biomarker in larger cohorts and longitudinal studies and to understand the role of these cells in SSc-ILD.

  相似文献   
6.
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.
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