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   3151364篇
  免费   252366篇
  国内免费   5645篇
耳鼻咽喉   45795篇
儿科学   101443篇
妇产科学   85197篇
基础医学   446059篇
口腔科学   89967篇
临床医学   286847篇
内科学   614232篇
皮肤病学   65704篇
神经病学   260663篇
特种医学   125672篇
外国民族医学   1301篇
外科学   476816篇
综合类   74167篇
现状与发展   2篇
一般理论   1242篇
预防医学   252695篇
眼科学   73785篇
药学   235983篇
  6篇
中国医学   5947篇
肿瘤学   165852篇
  2018年   32516篇
  2017年   24922篇
  2016年   27482篇
  2015年   31035篇
  2014年   44377篇
  2013年   67698篇
  2012年   91897篇
  2011年   97279篇
  2010年   57468篇
  2009年   54908篇
  2008年   92395篇
  2007年   98520篇
  2006年   99148篇
  2005年   96486篇
  2004年   93339篇
  2003年   90347篇
  2002年   88794篇
  2001年   146031篇
  2000年   151237篇
  1999年   128205篇
  1998年   37136篇
  1997年   33653篇
  1996年   33520篇
  1995年   32331篇
  1994年   30305篇
  1993年   28315篇
  1992年   103143篇
  1991年   100236篇
  1990年   96836篇
  1989年   93258篇
  1988年   86359篇
  1987年   85087篇
  1986年   80293篇
  1985年   76822篇
  1984年   58256篇
  1983年   49576篇
  1982年   29841篇
  1981年   26783篇
  1979年   54263篇
  1978年   38021篇
  1977年   32153篇
  1976年   30229篇
  1975年   32124篇
  1974年   39150篇
  1973年   37323篇
  1972年   34796篇
  1971年   32020篇
  1970年   30323篇
  1969年   28056篇
  1968年   25546篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
35.
Secondary tricuspid regurgitation (TR) caused by right ventricular enlargement in the setting of left heart disease/pulmonary hypertension has been well described. In contrast, that associated with right atrial enlargement—atrial functional TR (AF‐TR)—remains largely underappreciated. AF‐TR most often occurs in the setting of lone atrial fibrillation, although it is also seen in its absence (idiopathic AF‐TR). Several recent studies have found that the prevalence, hemodynamic significance, and prognosis of AF‐TR are not inconsequential, suggesting increased physician awareness of this novel clinical entity is warranted. This article discusses the pathogenesis, echocardiographic findings, and treatment of this underappreciated cause of secondary TR.  相似文献   
36.
37.
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.  相似文献   
38.
39.
Background: Traumatic brain injury (TBI) results in verbal recall deficits and impaired processing of emotion encoded in facial appearance, prosody and the linguistic content of messages. Emotion facilitates memory (emotional memory advantage) for non-brain injured (NBI) individuals but the impact of emotion on verbal recall for linguistically encoded stimuli in TBI has not been explored.

Aims: The purpose of this study was to determine the effects of stimulus emotional content on verbal recall of words and paragraphs in TBI compared to NBI individuals.

Methods and procedures: Six 10-item lists, each with five emotional and five neutral words, and six paragraphs (three emotional, three neutral) were counterbalanced and presented in random order to 20 individuals with TBI and 44 NBI. The number of words from lists and the number of content units from paragraphs were compared for the two groups.

Outcomes and results: The NBI participants recalled more words from the lists and content units from the paragraphs than the individuals with TBI. Both groups recalled significantly more emotional than neutral words. NBI but not TBI participants had significantly greater recall for information in paragraphs with emotional content.

Conclusions: Participants with TBI showed impaired recall of words and paragraph content. Emotion facilitated word and paragraph content recall for neurotypical individuals but emotional memory advantage was limited to words for the TBI participants.  相似文献   

40.
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