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   3492568篇
  免费   291078篇
  国内免费   13360篇
耳鼻咽喉   47776篇
儿科学   112104篇
妇产科学   91656篇
基础医学   555082篇
口腔科学   94509篇
临床医学   317696篇
内科学   618730篇
皮肤病学   92911篇
神经病学   298397篇
特种医学   136684篇
外国民族医学   319篇
外科学   533353篇
综合类   103431篇
现状与发展   24篇
一般理论   2378篇
预防医学   297597篇
眼科学   79982篇
药学   239500篇
  26篇
中国医学   9520篇
肿瘤学   165331篇
  2021年   54926篇
  2020年   35016篇
  2019年   57916篇
  2018年   71315篇
  2017年   54364篇
  2016年   59841篇
  2015年   73973篇
  2014年   108095篇
  2013年   173248篇
  2012年   95220篇
  2011年   95923篇
  2010年   117210篇
  2009年   121504篇
  2008年   83184篇
  2007年   86952篇
  2006年   96780篇
  2005年   92670篇
  2004年   94254篇
  2003年   85009篇
  2002年   74894篇
  2001年   107100篇
  2000年   99794篇
  1999年   98938篇
  1998年   64946篇
  1997年   62862篇
  1996年   61064篇
  1995年   56454篇
  1994年   50676篇
  1993年   47331篇
  1992年   69955篇
  1991年   67164篇
  1990年   63839篇
  1989年   62803篇
  1988年   58454篇
  1987年   57099篇
  1986年   54455篇
  1985年   53940篇
  1984年   49289篇
  1983年   45238篇
  1982年   42048篇
  1981年   39737篇
  1980年   37454篇
  1979年   41861篇
  1978年   37037篇
  1977年   33437篇
  1976年   30650篇
  1975年   29738篇
  1974年   31273篇
  1973年   30348篇
  1972年   28568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.
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   
84.
85.
86.
87.
88.
89.
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   

90.
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