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   2608121篇
  免费   205842篇
  国内免费   6354篇
耳鼻咽喉   34986篇
儿科学   86473篇
妇产科学   73209篇
基础医学   376754篇
口腔科学   75338篇
临床医学   243310篇
内科学   502501篇
皮肤病学   54413篇
神经病学   214332篇
特种医学   99705篇
外国民族医学   804篇
外科学   380037篇
综合类   62591篇
现状与发展   4篇
一般理论   978篇
预防医学   214096篇
眼科学   59188篇
药学   195573篇
  8篇
中国医学   5441篇
肿瘤学   140576篇
  2018年   27640篇
  2017年   21202篇
  2016年   23389篇
  2015年   26871篇
  2014年   37053篇
  2013年   57251篇
  2012年   77919篇
  2011年   82564篇
  2010年   48442篇
  2009年   45451篇
  2008年   77231篇
  2007年   81494篇
  2006年   82218篇
  2005年   79820篇
  2004年   77375篇
  2003年   73803篇
  2002年   72171篇
  2001年   117425篇
  2000年   121307篇
  1999年   102454篇
  1998年   29031篇
  1997年   26374篇
  1996年   26099篇
  1995年   25223篇
  1994年   23668篇
  1993年   22371篇
  1992年   83672篇
  1991年   81898篇
  1990年   79691篇
  1989年   76514篇
  1988年   71178篇
  1987年   69860篇
  1986年   66623篇
  1985年   64166篇
  1984年   48243篇
  1983年   41449篇
  1982年   24800篇
  1981年   22099篇
  1979年   45260篇
  1978年   31826篇
  1977年   26626篇
  1976年   25427篇
  1975年   26657篇
  1974年   32579篇
  1973年   31541篇
  1972年   29037篇
  1971年   27259篇
  1970年   25130篇
  1969年   23323篇
  1968年   21831篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
91.

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   
92.
93.
94.
ContextIt is especially important that patients are well informed when making high-stakes, preference-sensitive decisions like those on the Physician Orders for Life-Sustaining Treatment (POLST) form. However, there is currently no way to easily evaluate whether patients understand key concepts when making these important decisions.ObjectivesTo develop a POLST knowledge survey.MethodsExpert (n = 62) ratings of key POLST facts were used to select items for a POLST knowledge survey. The survey was administered to nursing facility residents (n = 97) and surrogate decision-makers (n = 112). A subset (n = 135) were re-administered the survey after a standardized advance care planning discussion to assess the scale's responsiveness to change.ResultsThe 19-item survey demonstrated adequate reliability (α = 0.72.). Residents' scores (x = 11.4, standard deviation 3.3) were significantly lower than surrogate scores (x = 14.7, standard deviation 2.5) (P < 0.001). Scores for both groups increased significantly after administration of a standardized advance care planning discussion (P < 0.001). Although being a surrogate, age, race, education, cognitive functioning, and health literacy were significantly associated with higher POLST Knowledge Survey scores in univariate analyses, only being a surrogate (P < 0.001) and being white (P = 0.028) remained significantly associated with higher scores in multivariate analyses.ConclusionThe 19-item POLST Knowledge Survey demonstrated adequate reliability and responsiveness to change. Findings suggest the survey could be used to identify knowledge deficits and provide targeted education to ensure adequate understanding of key clinical decisions when completing POLST.  相似文献   
95.
96.
97.
98.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  相似文献   
99.
100.
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