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   2937126篇
  免费   239949篇
  国内免费   12995篇
耳鼻咽喉   40105篇
儿科学   92301篇
妇产科学   73029篇
基础医学   483512篇
口腔科学   76425篇
临床医学   266507篇
内科学   500775篇
皮肤病学   83686篇
神经病学   249864篇
特种医学   115679篇
外国民族医学   81篇
外科学   463601篇
综合类   88298篇
现状与发展   23篇
一般理论   2148篇
预防医学   249013篇
眼科学   66550篇
药学   196550篇
  22篇
中国医学   8666篇
肿瘤学   133235篇
  2022年   23085篇
  2021年   55088篇
  2020年   35083篇
  2019年   58061篇
  2018年   70761篇
  2017年   53710篇
  2016年   59046篇
  2015年   73589篇
  2014年   107682篇
  2013年   172781篇
  2012年   79662篇
  2011年   78807篇
  2010年   114132篇
  2009年   118686篇
  2008年   64674篇
  2007年   66642篇
  2006年   77219篇
  2005年   72813篇
  2004年   74760篇
  2003年   66026篇
  2002年   56059篇
  2001年   72518篇
  2000年   64101篇
  1999年   70236篇
  1998年   61921篇
  1997年   60379篇
  1996年   58067篇
  1995年   53535篇
  1994年   47570篇
  1993年   44618篇
  1992年   46956篇
  1991年   46187篇
  1990年   43811篇
  1989年   43966篇
  1988年   40810篇
  1987年   39984篇
  1986年   37826篇
  1985年   38814篇
  1984年   38451篇
  1983年   36076篇
  1982年   37924篇
  1981年   36122篇
  1980年   34237篇
  1979年   30690篇
  1978年   29433篇
  1977年   27285篇
  1976年   25450篇
  1975年   24458篇
  1974年   23832篇
  1973年   22778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