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   3359323篇
  免费   272323篇
  国内免费   13766篇
耳鼻咽喉   45743篇
儿科学   100148篇
妇产科学   83621篇
基础医学   533740篇
口腔科学   91530篇
临床医学   300323篇
内科学   590699篇
皮肤病学   88683篇
神经病学   288035篇
特种医学   130874篇
外国民族医学   120篇
外科学   529225篇
综合类   98367篇
现状与发展   25篇
一般理论   2386篇
预防医学   277372篇
眼科学   76947篇
药学   233580篇
  25篇
中国医学   9824篇
肿瘤学   164145篇
  2021年   55410篇
  2020年   35329篇
  2019年   58483篇
  2018年   71600篇
  2017年   54585篇
  2016年   60190篇
  2015年   74517篇
  2014年   108971篇
  2013年   174491篇
  2012年   93520篇
  2011年   93524篇
  2010年   117341篇
  2009年   121711篇
  2008年   81273篇
  2007年   84014篇
  2006年   94897篇
  2005年   90694篇
  2004年   92396篇
  2003年   83063篇
  2002年   72837篇
  2001年   103567篇
  2000年   96452篇
  1999年   96411篇
  1998年   65123篇
  1997年   62896篇
  1996年   60613篇
  1995年   56047篇
  1994年   50049篇
  1993年   46715篇
  1992年   66872篇
  1991年   63182篇
  1990年   59699篇
  1989年   59221篇
  1988年   54655篇
  1987年   53410篇
  1986年   50245篇
  1985年   50730篇
  1984年   46318篇
  1983年   42724篇
  1982年   40809篇
  1981年   38477篇
  1980年   36213篇
  1979年   37245篇
  1978年   33359篇
  1977年   31070篇
  1976年   27854篇
  1975年   26434篇
  1974年   26832篇
  1973年   25476篇
  1972年   23926篇
排序方式: 共有10000条查询结果,搜索用时 15 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