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   3211196篇
  免费   269777篇
  国内免费   14066篇
耳鼻咽喉   44256篇
儿科学   98547篇
妇产科学   82337篇
基础医学   513997篇
口腔科学   87453篇
临床医学   287017篇
内科学   558276篇
皮肤病学   85596篇
神经病学   278544篇
特种医学   127340篇
外国民族医学   197篇
外科学   502223篇
综合类   102408篇
现状与发展   24篇
一般理论   2295篇
预防医学   272002篇
眼科学   73522篇
药学   221444篇
  23篇
中国医学   9320篇
肿瘤学   148218篇
  2021年   55210篇
  2020年   35198篇
  2019年   58272篇
  2018年   70932篇
  2017年   54008篇
  2016年   59671篇
  2015年   74009篇
  2014年   108396篇
  2013年   173823篇
  2012年   89192篇
  2011年   87965篇
  2010年   115345篇
  2009年   120597篇
  2008年   74550篇
  2007年   77368篇
  2006年   88099篇
  2005年   83804篇
  2004年   85949篇
  2003年   76858篇
  2002年   66292篇
  2001年   84502篇
  2000年   76560篇
  1999年   80476篇
  1998年   63486篇
  1997年   61819篇
  1996年   59507篇
  1995年   55019篇
  1994年   49364篇
  1993年   46157篇
  1992年   57575篇
  1991年   54787篇
  1990年   51980篇
  1989年   51571篇
  1988年   48380篇
  1987年   47271篇
  1986年   45030篇
  1985年   45667篇
  1984年   43711篇
  1983年   40370篇
  1982年   40408篇
  1981年   38215篇
  1980年   36127篇
  1979年   37002篇
  1978年   33608篇
  1977年   30898篇
  1976年   28116篇
  1975年   26634篇
  1974年   27771篇
  1973年   26696篇
  1972年   25105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