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   1465850篇
  免费   100753篇
  国内免费   1987篇
耳鼻咽喉   19755篇
儿科学   51191篇
妇产科学   38280篇
基础医学   202357篇
口腔科学   35157篇
临床医学   123849篇
内科学   291538篇
皮肤病学   28786篇
神经病学   117667篇
特种医学   60522篇
外国民族医学   660篇
外科学   228621篇
综合类   29669篇
现状与发展   1篇
一般理论   379篇
预防医学   114211篇
眼科学   30645篇
药学   105001篇
  2篇
中国医学   3045篇
肿瘤学   87254篇
  2018年   35719篇
  2017年   27959篇
  2016年   31948篇
  2015年   13337篇
  2014年   17943篇
  2013年   26950篇
  2012年   42806篇
  2011年   59446篇
  2010年   41707篇
  2009年   33742篇
  2008年   57475篇
  2007年   63386篇
  2006年   40004篇
  2005年   41185篇
  2004年   41852篇
  2003年   42330篇
  2002年   39493篇
  2001年   64414篇
  2000年   67213篇
  1999年   56680篇
  1998年   15391篇
  1997年   14083篇
  1996年   14338篇
  1995年   13626篇
  1994年   12954篇
  1993年   11938篇
  1992年   44680篇
  1991年   43641篇
  1990年   42391篇
  1989年   40244篇
  1988年   37001篇
  1987年   36359篇
  1986年   33716篇
  1985年   32386篇
  1984年   24201篇
  1983年   20332篇
  1982年   11816篇
  1981年   10707篇
  1980年   9626篇
  1979年   21432篇
  1978年   14886篇
  1977年   12553篇
  1976年   11758篇
  1975年   12628篇
  1974年   14697篇
  1973年   14127篇
  1972年   12944篇
  1971年   11729篇
  1970年   11080篇
  1969年   10062篇
排序方式: 共有10000条查询结果,搜索用时 17 毫秒
11.
12.
13.
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   
14.
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   

15.
16.
17.
18.
19.
Purpose: To use polymerase chain reaction (PCR) and Goldmann-Witmer coefficient (GWC) calculation to diagnose infectious uveitis.

Methods: Prospective cross-sectional study.

Results: Twenty-seven of 106 patients had positive PCR and/or GWC results on aqueous humor (AH) sampling and 15 of 27 (55.6%) were HIV-positive. Patients with non-anterior uveitis (NAU) were more likely to be HIV+ (p = 0.005). More than 1 possible pathogen was identified in 9 of 27 patients of whom 7 were HIV+. The final clinical diagnosis was discordant with AH findings in 9 of 27 cases. A positive EBV PCR result was associated with a discordant diagnosis (p = 0.001). All cases of herpetic anterior uveitis (42.9% HIV+) tested PCR-/GWC+ while all cases of herpetic NAU tested PCR+/GWC- (83.3% HIV+). All rubella virus cases were PCR+/GWC+.

Conclusion: PCR is useful to diagnose herpetic NAU in HIV+ patients while GWC is useful to diagnose herpetic anterior uveitis.  相似文献   

20.
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