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   2543565篇
  免费   203238篇
  国内免费   3956篇
耳鼻咽喉   36284篇
儿科学   86524篇
妇产科学   72081篇
基础医学   362528篇
口腔科学   72823篇
临床医学   225507篇
内科学   498085篇
皮肤病学   54845篇
神经病学   204191篇
特种医学   101675篇
外国民族医学   1064篇
外科学   387753篇
综合类   59953篇
现状与发展   4篇
一般理论   867篇
预防医学   196657篇
眼科学   58482篇
药学   191289篇
  4篇
中国医学   4747篇
肿瘤学   135396篇
  2018年   24803篇
  2016年   21135篇
  2015年   24201篇
  2014年   33619篇
  2013年   51581篇
  2012年   70076篇
  2011年   74223篇
  2010年   44167篇
  2009年   42049篇
  2008年   71057篇
  2007年   75419篇
  2006年   76306篇
  2005年   74289篇
  2004年   72762篇
  2003年   69930篇
  2002年   68539篇
  2001年   119633篇
  2000年   124138篇
  1999年   105397篇
  1998年   28978篇
  1997年   26267篇
  1996年   26554篇
  1995年   25633篇
  1994年   24178篇
  1993年   22628篇
  1992年   86017篇
  1991年   83888篇
  1990年   82093篇
  1989年   78762篇
  1988年   73046篇
  1987年   71953篇
  1986年   67912篇
  1985年   65464篇
  1984年   49062篇
  1983年   42036篇
  1982年   24660篇
  1981年   22190篇
  1980年   20498篇
  1979年   45985篇
  1978年   32079篇
  1977年   27050篇
  1976年   25461篇
  1975年   27169篇
  1974年   32717篇
  1973年   31523篇
  1972年   28992篇
  1971年   26876篇
  1970年   24979篇
  1969年   23196篇
  1968年   21194篇
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
81.
82.
83.

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   
84.
85.
86.
Pharmaceutical Chemistry Journal - Three extracts were produced from the above-ground part of the meadowsweet Filipendula ulmaria (L.) Maxim. using water, 40% ethanol, and 70% ethanol. Comparative...  相似文献   
87.
88.
Haemophilia is a common cause of genetically inherited bleeding disorders. Pseudotumours occur in 1–2 % of persons with severe forms of haemophilia. These are a result of repeated haemorrhage into soft tissues, subperiosteum or a site of bone fracture with inadequate resorption of the extravasated blood. There are a number of therapeutic alternatives for this dangerous condition: surgical removal, percutaneous management, irradiation, embolization etc. In this case report, we describe the natural history, clinical course and successful surgical management of a patient with haemophilia who presented with a massive pseudotumour. We also briefly review the relevant literature on the various therapeutic modalities that have been implemented in the management of this rare complication. Though surgeons may be averse to operate on haemophiliacs, primary surgical management as done in our case may prove to be the definitive treatment option for such patients.  相似文献   
89.
90.
As millions of people turn to social media for health information, better understanding the factors that guide health-related judgments and perceptions in this context is imperative. We report on two Web experiments (n > 400 total) examining the power of society’s widespread weight bias and related stereotypes to influence nutrition judgments in social media spaces. In Experiment 1, meals were judged as lower in nutritional quality when the person who recommended them (the source) was depicted as obese rather than of normal weight, an effect mediated by stereotypic beliefs about the source as a generally unhealthy person. Experiment 2 replicated this effect, which—notably—remained significant when controlling for objective nutritional information (calories and fat content). Results highlight spillover effects of weight bias that extend beyond person perception to color impressions of objects (here, food) that are associated with stigmatized attributes. Implications for everyday nutrition judgments and public health are considered.  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