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   16384篇
  免费   1277篇
  国内免费   30篇
耳鼻咽喉   112篇
儿科学   681篇
妇产科学   464篇
基础医学   2179篇
口腔科学   231篇
临床医学   2843篇
内科学   2803篇
皮肤病学   186篇
神经病学   1253篇
特种医学   606篇
外科学   1741篇
综合类   251篇
一般理论   32篇
预防医学   2092篇
眼科学   275篇
药学   922篇
中国医学   27篇
肿瘤学   993篇
  2023年   104篇
  2022年   111篇
  2021年   274篇
  2020年   225篇
  2019年   326篇
  2018年   390篇
  2017年   259篇
  2016年   340篇
  2015年   331篇
  2014年   448篇
  2013年   762篇
  2012年   983篇
  2011年   1160篇
  2010年   527篇
  2009年   521篇
  2008年   976篇
  2007年   964篇
  2006年   955篇
  2005年   918篇
  2004年   920篇
  2003年   846篇
  2002年   809篇
  2001年   305篇
  2000年   292篇
  1999年   236篇
  1998年   185篇
  1997年   152篇
  1996年   140篇
  1995年   117篇
  1994年   111篇
  1993年   116篇
  1992年   182篇
  1991年   172篇
  1990年   177篇
  1989年   181篇
  1988年   171篇
  1987年   208篇
  1986年   157篇
  1985年   159篇
  1984年   143篇
  1983年   122篇
  1982年   82篇
  1981年   79篇
  1980年   69篇
  1979年   76篇
  1978年   76篇
  1974年   74篇
  1973年   80篇
  1972年   65篇
  1971年   66篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.

Objective

To examine whether a healthy weight intervention embedded in the Parents as Teachers (PAT) home visiting program, which was previously found to improve mothers’ body mass index (BMI) and obesity-related behaviors, changed the BMI of preschool children or maternal feeding practices.

Methods

This stratified randomized trial included preschool-aged children at risk for overweight whose mothers were overweight or had obesity (n?=?179). The Healthy Eating and Active Living Taught at Home (HEALTH) intervention was based on the Diabetes Prevention Program. Differences were examined using repeated-measures mixed-ANOVA models.

Results

Compared with PAT usual care, the HEALTH intervention had no effect on children's BMI or maternal feeding practices. However, combined analyses showed that children's BMI percentile decreased (P??=?.007), BMI z-scores were maintained (P??=?.19), and 3 of 8 feeding practices improved over time (P < .05).

Conclusions and Implications

Additional research is needed to assess the effectiveness of PAT to prevent preschool-age obesity using rigorous designs (eg, group-randomized trials) and to identify its active components. HEALTH is ready to be scaled up to prevent maternal weight gain through embedding within the national PAT program.  相似文献   
2.
3.
4.
5.
6.
7.
Animal models have traditionally provided the basis for preliminary investigation of new techniques prior to trials taking place in human subjects. The timing of when to proceed with human trials is difficult, as the accuracy of preclinical models can only be determined with hindsight. This review outlines the progression from transplantation in animal models to man. Now that many transplant procedures are well established, it is possible to assess the predictive value and limitations of animal models. These results are of great importance in the current debate about composite tissue allotransplantation (CTA) and in particular facial transplantation. This progression of CTA from animal models to man is outlined and compared with early renal, cardiac, and liver transplants. There is some evidence to suggest that animal models may have been misleading in CTA and that this has effectively delayed the transition to humans. The role for animal models in facial transplantation, which is currently making the step to clinical trials, is discussed.  相似文献   
8.
Relationship-centered care reflects both knowing and feeling: the knowledge that physician and patient bring from their respective domains of expertise, and the physician’s and patient’s experience, expression, and perception of emotions during the medical encounter. These processes are conveyed and reciprocated in the care process through verbal and nonverbal communication. We suggest that the emotional context of care is especially related to nonverbal communication and that emotion-related communication skills, including sending and receiving nonverbal messages and emotional self-awareness, are critical elements of high-quality care. Although nonverbal behavior has received far less study than other care processes, the current review argues that it holds significance for the therapeutic relationship and influences important outcomes including satisfaction, adherence, and clinical outcomes of care.  相似文献   
9.
10.
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