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   2763861篇
  免费   203325篇
  国内免费   6091篇
耳鼻咽喉   36747篇
儿科学   89354篇
妇产科学   75650篇
基础医学   399789篇
口腔科学   79097篇
临床医学   253605篇
内科学   535631篇
皮肤病学   62737篇
神经病学   217130篇
特种医学   104600篇
外国民族医学   496篇
外科学   405509篇
综合类   61187篇
现状与发展   11篇
一般理论   1103篇
预防医学   215105篇
眼科学   65393篇
药学   205207篇
  12篇
中国医学   7276篇
肿瘤学   157638篇
  2021年   24031篇
  2019年   23787篇
  2018年   33027篇
  2017年   24944篇
  2016年   28121篇
  2015年   33041篇
  2014年   44917篇
  2013年   65365篇
  2012年   90919篇
  2011年   95214篇
  2010年   56071篇
  2009年   52257篇
  2008年   87126篇
  2007年   92102篇
  2006年   91756篇
  2005年   88333篇
  2004年   84615篇
  2003年   80192篇
  2002年   77188篇
  2001年   129799篇
  2000年   132641篇
  1999年   110774篇
  1998年   30639篇
  1997年   27056篇
  1996年   27304篇
  1995年   25968篇
  1994年   23913篇
  1993年   22213篇
  1992年   84994篇
  1991年   82798篇
  1990年   79760篇
  1989年   77097篇
  1988年   70700篇
  1987年   69164篇
  1986年   65523篇
  1985年   61964篇
  1984年   46317篇
  1983年   39903篇
  1982年   23082篇
  1979年   42332篇
  1978年   30069篇
  1977年   25482篇
  1976年   23702篇
  1975年   25193篇
  1974年   30622篇
  1973年   29848篇
  1972年   27854篇
  1971年   25888篇
  1970年   24312篇
  1969年   22842篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
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   
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.
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