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   2453009篇
  免费   187128篇
  国内免费   5020篇
耳鼻咽喉   34399篇
儿科学   81412篇
妇产科学   70754篇
基础医学   353332篇
口腔科学   68404篇
临床医学   215453篇
内科学   483392篇
皮肤病学   55410篇
神经病学   196988篇
特种医学   93427篇
外国民族医学   794篇
外科学   370280篇
综合类   54376篇
现状与发展   4篇
一般理论   760篇
预防医学   191696篇
眼科学   56550篇
药学   180228篇
  2篇
中国医学   5380篇
肿瘤学   132116篇
  2018年   27377篇
  2017年   20437篇
  2016年   22932篇
  2015年   25982篇
  2014年   35930篇
  2013年   54172篇
  2012年   74588篇
  2011年   79362篇
  2010年   46495篇
  2009年   43599篇
  2008年   74231篇
  2007年   79309篇
  2006年   80156篇
  2005年   78092篇
  2004年   74905篇
  2003年   71745篇
  2002年   70071篇
  2001年   114489篇
  2000年   117366篇
  1999年   98446篇
  1998年   28058篇
  1997年   25208篇
  1996年   25338篇
  1995年   23981篇
  1994年   22072篇
  1993年   20739篇
  1992年   76423篇
  1991年   74006篇
  1990年   72157篇
  1989年   69540篇
  1988年   64214篇
  1987年   62981篇
  1986年   59446篇
  1985年   56726篇
  1984年   42830篇
  1983年   36723篇
  1982年   22090篇
  1981年   19649篇
  1979年   39305篇
  1978年   27788篇
  1977年   23463篇
  1976年   22318篇
  1975年   23824篇
  1974年   28404篇
  1973年   27383篇
  1972年   25864篇
  1971年   23797篇
  1970年   22471篇
  1969年   21275篇
  1968年   19993篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
21.
22.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36 weeks gestational age)...  相似文献   
23.
Introduction: The Hedgehog (HH) pathway constitutes a collection of signaling molecules which critically influence embryogenesis. In adults, however, the HH pathway remains integral to the proliferation, maintenance, and apoptosis of adult stem cells including hematopoietic stem cells.

Areas covered: We discuss the current understanding of the HH pathway as it relates to normal hematopoiesis, the pathology of acute myeloid leukemia (AML), the rationale for and data from combination therapies including HH pathway inhibitors, and ultimately the prospects that might offer promise in targeting this pathway in AML.

Expert opinion: Efforts to target the HH pathway have been focused on impeding this disposition and restoring chemosensitivity to conventional myeloid neoplasm therapies. The year 2018 saw the first approval of a HH pathway inhibitor (glasdegib) for AML, though for an older population and in combination with an uncommonly-used therapy. Several other clinical trials with agents targeting modulators of HH signaling in AML and MDS are underway. Further study and understanding of the interplay between the numerous aspects of HH signaling and how it relates to the augmented survival of AML will provide a more reliable substrate for therapeutic strategies in patients with this poor-risk disease.  相似文献   

24.
25.
26.
27.
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   
28.
29.
ABSTRACT

This project examined 55 picture books featuring transgender, gender expansive or genderqueer protagonists or narrators published between 2008 and 2018. The purpose of the study was to determine how this genre of children’s literature supports and challenges four gender assumptions: the gender binary, gender essentialism, sex/gender congruency and gender stability. Additionally, this critical analysis explored misgendering within this genre and themes of social rejection and acceptance. Protagonists and narrators were permitted a degree of gender nonconformity, however, the majority of picture books missed opportunities for a more complete exploration of gender possibilities.  相似文献   
30.
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