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   123709篇
  免费   10780篇
  国内免费   346篇
耳鼻咽喉   1337篇
儿科学   3227篇
妇产科学   2165篇
基础医学   17453篇
口腔科学   1892篇
临床医学   13906篇
内科学   25059篇
皮肤病学   1418篇
神经病学   12060篇
特种医学   4782篇
外国民族医学   57篇
外科学   18534篇
综合类   1860篇
一般理论   133篇
预防医学   10969篇
眼科学   3065篇
药学   8699篇
中国医学   118篇
肿瘤学   8101篇
  2023年   769篇
  2022年   1006篇
  2021年   3022篇
  2020年   1744篇
  2019年   2801篇
  2018年   3202篇
  2017年   2326篇
  2016年   2463篇
  2015年   2822篇
  2014年   4116篇
  2013年   5524篇
  2012年   8442篇
  2011年   8715篇
  2010年   4859篇
  2009年   4274篇
  2008年   7283篇
  2007年   7469篇
  2006年   7098篇
  2005年   6963篇
  2004年   6507篇
  2003年   5904篇
  2002年   5483篇
  2001年   2071篇
  2000年   1998篇
  1999年   1924篇
  1998年   1357篇
  1997年   1085篇
  1996年   934篇
  1995年   890篇
  1994年   827篇
  1993年   786篇
  1992年   1315篇
  1991年   1306篇
  1990年   1196篇
  1989年   1164篇
  1988年   1160篇
  1987年   1002篇
  1986年   998篇
  1985年   983篇
  1984年   878篇
  1983年   727篇
  1982年   617篇
  1981年   589篇
  1980年   509篇
  1979年   754篇
  1978年   629篇
  1977年   536篇
  1976年   482篇
  1974年   486篇
  1973年   477篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
The coronavirus 2019 pandemic has affected almost every aspect of health care delivery in the United States, and the emergency medicine system has been hit particularly hard while dealing with this public health crisis. In an unprecedented time in our history, medical systems and clinicians have been asked to be creative, flexible, and innovative, all while continuing to uphold the important standards in the US health care system. To continue providing quality services to patients during this extraordinary time, care providers, organizations, administrators, and insurers have needed to alter longstanding models and procedures to respond to the dynamics of a pandemic. The Emergency Medicine Treatment and Active Labor Act of 1986, or EMTALA, is 1 example of where these alterations have allowed health care facilities and clinicians to continue their work of caring for patients while protecting both the patients and the clinicians themselves from infectious exposures at the same time.  相似文献   
3.
4.
5.
Heart Failure Reviews - The nitric oxide (NO)–guanylate cyclase (GC)–cyclic guanosine monophosphate (cGMP) pathway plays an important role in cardiovascular, pulmonary and renal...  相似文献   
6.
7.

Background

Resistin is an immunometabolic mediator that is elevated in several inflammatory disorders. A ligand for Toll-like receptor 4, resistin modulates the recruitment and activation of myeloid cells, notably neutrophils. Neutrophils are major drivers of cystic fibrosis (CF) lung disease, in part due to the release of human neutrophil elastase- and myeloperoxidase-rich primary granules, leading to tissue damage. Here we assessed the relationship of resistin to CF lung disease.

Methods

Resistin levels were measured in plasma and sputum from three retrospective CF cohorts spanning a wide range of disease. We also assessed the ability of neutrophils to secrete resistin upon activation in vitro. Finally, we constructed a multivariate model assessing the relationship between resistin levels and lung function.

Results

Plasma resistin levels were only marginally higher in CF than in healthy control subjects. By contrast, sputum resistin levels were very high in CF, reaching 50–100 fold higher levels than in plasma. Among CF patients, higher plasma resistin levels were associated with allergic bronchopulmonary aspergillosis, and higher sputum resistin levels were associated with CF-related diabetes. Mechanistically, in vitro release of neutrophil primary granules was concomitant with resistin secretion. Overall, sputum resistin levels were negatively correlated with CF lung function, independently of other variables (age, sex, and genotype).

Conclusions

Our data establish relationships between resistin levels in the plasma and sputum of CF patients that correlate with disease status, and identify resistin as a novel mechanistic link between neutrophilic inflammation and lung disease in CF.  相似文献   
8.
Abstract

Objective

Ras wild-type metastatic colorectal cancers (mCRC) may be treated with anti-vascular endothelial growth factor (VEGF) or anti-epidermal growth factor receptor (EGFR) agents. We aim to estimate patients’ preferences for mCRC treatment and relative importance of cost, efficacy improvement, avoidance of side effects and therapy convenience, and relative uptake between profiles that resemble Bevacizumab (anti-VEGF) and Cetuximab (anti-EGFR), two commonly prescribed mCRC targeted therapies.  相似文献   
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