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   3136005篇
  免费   230263篇
  国内免费   6202篇
耳鼻咽喉   43278篇
儿科学   102164篇
妇产科学   85021篇
基础医学   460698篇
口腔科学   86593篇
临床医学   284837篇
内科学   601970篇
皮肤病学   70482篇
神经病学   248488篇
特种医学   120790篇
外国民族医学   768篇
外科学   469210篇
综合类   66587篇
现状与发展   17篇
一般理论   1229篇
预防医学   244764篇
眼科学   73638篇
药学   234078篇
  12篇
中国医学   7346篇
肿瘤学   170500篇
  2021年   27413篇
  2019年   27018篇
  2018年   37982篇
  2017年   29134篇
  2016年   32742篇
  2015年   37281篇
  2014年   51155篇
  2013年   75446篇
  2012年   104669篇
  2011年   109747篇
  2010年   65267篇
  2009年   60934篇
  2008年   100627篇
  2007年   106515篇
  2006年   106829篇
  2005年   106389篇
  2004年   102999篇
  2003年   97151篇
  2002年   91173篇
  2001年   138389篇
  2000年   141692篇
  1999年   119196篇
  1998年   35056篇
  1997年   30896篇
  1996年   31043篇
  1995年   29483篇
  1994年   27169篇
  1993年   25570篇
  1992年   92607篇
  1991年   90523篇
  1990年   88398篇
  1989年   85143篇
  1988年   78186篇
  1987年   77113篇
  1986年   72211篇
  1985年   69419篇
  1984年   51870篇
  1983年   44064篇
  1982年   26407篇
  1979年   47777篇
  1978年   34305篇
  1977年   28705篇
  1976年   27485篇
  1975年   29242篇
  1974年   35282篇
  1973年   33609篇
  1972年   31407篇
  1971年   29651篇
  1970年   27361篇
  1969年   25979篇
排序方式: 共有10000条查询结果,搜索用时 23 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.

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   
5.
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