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   185551篇
  免费   1467篇
  国内免费   66篇
耳鼻咽喉   1241篇
儿科学   6809篇
妇产科学   3209篇
基础医学   17606篇
口腔科学   1857篇
临床医学   13108篇
内科学   33617篇
皮肤病学   915篇
神经病学   17282篇
特种医学   9167篇
外科学   30342篇
综合类   2335篇
预防医学   18774篇
眼科学   2992篇
药学   10080篇
中国医学   649篇
肿瘤学   17101篇
  2023年   55篇
  2022年   152篇
  2021年   363篇
  2020年   179篇
  2019年   292篇
  2018年   22259篇
  2017年   17531篇
  2016年   19739篇
  2015年   1161篇
  2014年   1224篇
  2013年   1265篇
  2012年   7753篇
  2011年   21792篇
  2010年   19243篇
  2009年   11931篇
  2008年   20111篇
  2007年   22393篇
  2006年   1204篇
  2005年   2829篇
  2004年   3937篇
  2003年   4861篇
  2002年   2951篇
  2001年   353篇
  2000年   511篇
  1999年   290篇
  1998年   299篇
  1997年   282篇
  1996年   158篇
  1995年   156篇
  1994年   149篇
  1993年   87篇
  1992年   91篇
  1991年   141篇
  1990年   163篇
  1989年   118篇
  1988年   81篇
  1987年   70篇
  1986年   50篇
  1985年   57篇
  1984年   41篇
  1983年   52篇
  1982年   42篇
  1981年   30篇
  1980年   61篇
  1974年   30篇
  1938年   63篇
  1937年   27篇
  1934年   31篇
  1932年   56篇
  1930年   46篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.

Introduction  

This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning.  相似文献   
13.
14.
Aim:   In the last three decades, the segment of population aged 60 years and older has more than doubled in Brazil. People aged 80 years and older are expected to be the fastest-growing segment in the near future. This aim of this study was to analyze the legal structures currently in place in Brazil and to provide a framework for care policies and practices towards older-adults.
Methods:   This article focuses on past and present major socioeconomic burdens on this segment of the Brazilian population as well as on public achievements to overcome inequities.
Results:   Both the public health and the social security systems have been directed to provide preferential assistance to the aged. Nonetheless, the elderly remain the most impoverished segment of Brazil and carry the burden of an overall lack of specialized services. Moreover, socioeconomic inequalities and population diversity in Brazil affects elderly care, adding complexity to this unique scenario.
Conclusion:   Brazil has adopted legal hallmarks that substantially shifted public practices towards the elderly segment from a philanthropic status to a legitimate right for care and assistance. The demographic transition that took place provides an opportunity for innovative solutions in public policies for older adults in a developing economic environment.  相似文献   
15.
16.

Introduction  

Although ependymoma is the third most common pediatric brain tumor, we know little about the genetic/epigenetic basis of its initiation, maintenance, or progression. This is due in part to the heterogeneity of the disease, as well as the small sample size of the cohorts analyzed in most studies.  相似文献   
17.
18.
A benign esophageal leiomyoma with abnormally increased fluorine-18-fluorodeoxyglucose uptake on positron emission tomography (PET) was resected thoracoscopically. The tumor, of which the maximum standardized uptake value of the lesion was 4.7, was well defined and 38 mm in diameter. Neither mitotic activity nor degeneration was found histologically; and immunoreactivity for CD34, CD117, MIB-1, and glucose transporter-1 was negative immunohistochemically. A diagnosis of gastrointestinal stromal tumor was ruled out by an oncogenic kinase gene mutation study. This case cautions against PET-dependent evaluation for malignant potential of esophageal submucosal tumors.  相似文献   
19.
20.
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference.  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