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   2492793篇
  免费   179984篇
  国内免费   5415篇
耳鼻咽喉   35343篇
儿科学   76519篇
妇产科学   70365篇
基础医学   360526篇
口腔科学   71799篇
临床医学   223796篇
内科学   482605篇
皮肤病学   56070篇
神经病学   198759篇
特种医学   97116篇
外国民族医学   676篇
外科学   369540篇
综合类   53882篇
现状与发展   13篇
一般理论   1020篇
预防医学   188537篇
眼科学   58505篇
药学   187922篇
  9篇
中国医学   6053篇
肿瘤学   139137篇
  2018年   26684篇
  2017年   20702篇
  2016年   23441篇
  2015年   27644篇
  2014年   37502篇
  2013年   55549篇
  2012年   75178篇
  2011年   78877篇
  2010年   46496篇
  2009年   43944篇
  2008年   72932篇
  2007年   78117篇
  2006年   77598篇
  2005年   75400篇
  2004年   72370篇
  2003年   69007篇
  2002年   67024篇
  2001年   109154篇
  2000年   111513篇
  1999年   94463篇
  1998年   26587篇
  1997年   24066篇
  1996年   23850篇
  1995年   22432篇
  1994年   20962篇
  1992年   73859篇
  1991年   72189篇
  1990年   70353篇
  1989年   68583篇
  1988年   63734篇
  1987年   62596篇
  1986年   60040篇
  1985年   56686篇
  1984年   42898篇
  1983年   36900篇
  1982年   22113篇
  1981年   20125篇
  1979年   41019篇
  1978年   29739篇
  1977年   25348篇
  1976年   23358篇
  1975年   25834篇
  1974年   30981篇
  1973年   30312篇
  1972年   28961篇
  1971年   26989篇
  1970年   25550篇
  1969年   24435篇
  1968年   22813篇
  1967年   20529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.

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   
3.

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   
4.
5.
Die Anaesthesiologie - Auch wenn für Anästhesiologen über Jahrzehnte die Prophylaxe und Therapie postoperativer Schmerzen im Rahmen des postoperativen Patientenkomforts an vorderster...  相似文献   
6.
7.
8.
9.
10.
Journal of Behavioral Medicine - Evidence supports the use of graphic warnings to educate the public about the health harms of smoking and suggests warnings eliciting negative emotional responses...  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