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   1280083篇
  免费   100228篇
  国内免费   1998篇
耳鼻咽喉   18472篇
儿科学   44545篇
妇产科学   35062篇
基础医学   182652篇
口腔科学   33654篇
临床医学   111732篇
内科学   258869篇
皮肤病学   28070篇
神经病学   100763篇
特种医学   51326篇
外国民族医学   660篇
外科学   196857篇
综合类   27204篇
现状与发展   1篇
一般理论   380篇
预防医学   95994篇
眼科学   27945篇
药学   94970篇
  2篇
中国医学   2424篇
肿瘤学   70727篇
  2018年   13192篇
  2017年   10021篇
  2016年   10951篇
  2015年   12442篇
  2014年   17265篇
  2013年   26374篇
  2012年   36269篇
  2011年   38267篇
  2010年   22924篇
  2009年   21923篇
  2008年   36823篇
  2007年   39481篇
  2006年   39698篇
  2005年   38638篇
  2004年   37784篇
  2003年   36616篇
  2002年   35970篇
  2001年   64115篇
  2000年   66627篇
  1999年   56508篇
  1998年   15159篇
  1997年   13782篇
  1996年   14229篇
  1995年   13507篇
  1994年   12810篇
  1993年   11840篇
  1992年   44629篇
  1991年   43556篇
  1990年   42285篇
  1989年   40168篇
  1988年   36959篇
  1987年   36284篇
  1986年   33692篇
  1985年   32336篇
  1984年   24180篇
  1983年   20321篇
  1982年   11769篇
  1981年   10718篇
  1980年   9540篇
  1979年   21378篇
  1978年   14861篇
  1977年   12551篇
  1976年   11717篇
  1975年   12655篇
  1974年   14687篇
  1973年   14142篇
  1972年   12966篇
  1971年   11749篇
  1970年   11059篇
  1969年   10043篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
11.
12.
13.
14.
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   
15.
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   

16.
17.
18.
19.
20.
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   

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