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   4267560篇
  免费   359774篇
  国内免费   15257篇
耳鼻咽喉   60887篇
儿科学   132906篇
妇产科学   111723篇
基础医学   654641篇
口腔科学   118678篇
临床医学   387426篇
内科学   774969篇
皮肤病学   103283篇
神经病学   366153篇
特种医学   170517篇
外国民族医学   912篇
外科学   651678篇
综合类   126074篇
现状与发展   23篇
一般理论   2578篇
预防医学   362016篇
眼科学   100386篇
药学   301681篇
  24篇
中国医学   11353篇
肿瘤学   204683篇
  2021年   55645篇
  2020年   35469篇
  2019年   58586篇
  2018年   73159篇
  2017年   55866篇
  2016年   62172篇
  2015年   75477篇
  2014年   110205篇
  2013年   175515篇
  2012年   117264篇
  2011年   120264篇
  2010年   122767篇
  2009年   125960篇
  2008年   107488篇
  2007年   113955篇
  2006年   123522篇
  2005年   118666篇
  2004年   119627篇
  2003年   110341篇
  2002年   101000篇
  2001年   154303篇
  2000年   150457篇
  1999年   139528篇
  1998年   71255篇
  1997年   67737篇
  1996年   65623篇
  1995年   61483篇
  1994年   55560篇
  1993年   51600篇
  1992年   103559篇
  1991年   98944篇
  1990年   94047篇
  1989年   91683篇
  1988年   85303篇
  1987年   83770篇
  1986年   79460篇
  1985年   77898篇
  1984年   65937篇
  1983年   58843篇
  1982年   48129篇
  1981年   44869篇
  1980年   42163篇
  1979年   57823篇
  1978年   47028篇
  1977年   41589篇
  1976年   38651篇
  1975年   37843篇
  1974年   42413篇
  1973年   40546篇
  1972年   38014篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
We review the spectrum of cutaneous disorders associated with inflammatory and neoplastic plasmacytic pathology. Because plasma cells are derived from B‐lymphocytes our overview includes discussion of certain lymphoplasmacytic proliferations. It is structured along histopathological lines, addressing conditions characterized by (a) cutaneous plasma cell infiltrates, (b) deposits of plasma cell products or their derivatives in the skin and (c) miscellaneous, poorly understood cutaneous complications of plasmacytic disorders. Lesions arising primarily in the skin and those due to cutaneous involvement by multisystem disorders are addressed. The range includes a spectrum of tumefactive and circulatory manifestations. We highlight key clinical and pathological features of the different conditions and outline recent advances in our understanding of these entities. By emphasizing the dermatopathological characteristics of this spectrum of disorders we hope to hone the diagnostic accuracy of practitioners in the field.  相似文献   
82.
83.
84.
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   
85.
86.
87.
88.
89.
90.
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   

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