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   2350322篇
  免费   171239篇
  国内免费   3331篇
耳鼻咽喉   32051篇
儿科学   75893篇
妇产科学   62687篇
基础医学   348234篇
口腔科学   63633篇
临床医学   211360篇
内科学   457300篇
皮肤病学   51728篇
神经病学   185282篇
特种医学   88013篇
外国民族医学   489篇
外科学   353866篇
综合类   47509篇
现状与发展   12篇
一般理论   848篇
预防医学   182735篇
眼科学   54327篇
药学   175111篇
  11篇
中国医学   4575篇
肿瘤学   129228篇
  2021年   18985篇
  2019年   19537篇
  2018年   27061篇
  2017年   20359篇
  2016年   22746篇
  2015年   25640篇
  2014年   36094篇
  2013年   53954篇
  2012年   74678篇
  2011年   79410篇
  2010年   47058篇
  2009年   44568篇
  2008年   74614篇
  2007年   79486篇
  2006年   80301篇
  2005年   77785篇
  2004年   74380篇
  2003年   71694篇
  2002年   69371篇
  2001年   108741篇
  2000年   111460篇
  1999年   93502篇
  1998年   26995篇
  1997年   23661篇
  1996年   24055篇
  1995年   22718篇
  1994年   20895篇
  1993年   19713篇
  1992年   72004篇
  1991年   70072篇
  1990年   68395篇
  1989年   65668篇
  1988年   60308篇
  1987年   59132篇
  1986年   55219篇
  1985年   53008篇
  1984年   39312篇
  1983年   33396篇
  1982年   19861篇
  1979年   35868篇
  1978年   25653篇
  1977年   21231篇
  1976年   20333篇
  1975年   21818篇
  1974年   26149篇
  1973年   24802篇
  1972年   23202篇
  1971年   22040篇
  1970年   20247篇
  1969年   19316篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
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   
24.
25.
26.
27.
28.
The present study aimed at measuring seropositivities for infection by Ascaris suum and Toxocara canis using the excretory/secretory (E/S) antigens from Ascaris suum (AES) and Toxocara canis (TES) within an indigenous population. In addition, quantification of cytokine expressions in peripheral blood cells was determined. A total of 50 Warao indigenous were included; of which 43 were adults and seven children. In adults, 44.1% were seropositive for both parasites; whereas children had only seropositivity to one or the other helminth. For ascariosis, the percentage of AES seropositivity in adults and children was high; 23.3% and 57.1%, respectively. While that for toxocariosis, the percentage of TES seropositivity in adults and children was low; 9.3% and 14.3%, respectively. The percentage of seronegativity was comparable for AES and TES antigens in adults (27.9%) and children (28.6%). When positive sera were analyzed by Western blotting technique using AES antigens; three bands of 97.2, 193.6 and 200.2 kDas were mostly recognized. When the TES antigens were used, nine major bands were mostly identified; 47.4, 52.2, 84.9, 98.2, 119.1, 131.3, 175.6, 184.4 and 193.6 kDas. Stool examinations showed that Blastocystis hominis, Hymenolepis nana and Entamoeba coli were the most commonly observed intestinal parasites. Quantification of cytokines IFN-γ, IL-2, IL-6, TGF-β, TNF-α, IL-10 and IL-4 expressions showed that there was only a significant increased expression of IL-4 in indigenous with TES seropositivity (p < 0.002). Ascaris and Toxocara seropositivity was prevalent among Warao indigenous.  相似文献   
29.
A 42‐year‐old man presented with a viral prodrome and tested positive for influenza A. He rapidly deteriorated developing cardiogenic shock, rhabdomyolysis, and acute kidney injury. Patient improved 1 week later with supportive measures including vasopressors, inotropes, and an intraaortic balloon pump. We report this case as it highlights the discordance between echocardiographic ventricular wall thickening as a result of myocardial edema, and electrocardiographic findings at presentation, with a reversal in findings at time of resolution. Additionally, there was some suggestion of a regional pattern to the reduced longitudinal strain.  相似文献   
30.
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