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   9089篇
  免费   692篇
  国内免费   56篇
耳鼻咽喉   104篇
儿科学   236篇
妇产科学   241篇
基础医学   1270篇
口腔科学   729篇
临床医学   774篇
内科学   2217篇
皮肤病学   255篇
神经病学   901篇
特种医学   128篇
外科学   933篇
综合类   52篇
一般理论   2篇
预防医学   755篇
眼科学   176篇
药学   499篇
中国医学   47篇
肿瘤学   518篇
  2024年   11篇
  2023年   138篇
  2022年   116篇
  2021年   471篇
  2020年   283篇
  2019年   400篇
  2018年   433篇
  2017年   302篇
  2016年   351篇
  2015年   405篇
  2014年   506篇
  2013年   595篇
  2012年   823篇
  2011年   829篇
  2010年   431篇
  2009年   328篇
  2008年   606篇
  2007年   518篇
  2006年   392篇
  2005年   392篇
  2004年   336篇
  2003年   283篇
  2002年   215篇
  2001年   82篇
  2000年   58篇
  1999年   65篇
  1998年   43篇
  1997年   25篇
  1996年   20篇
  1995年   15篇
  1994年   14篇
  1993年   19篇
  1992年   42篇
  1991年   53篇
  1990年   31篇
  1989年   22篇
  1988年   23篇
  1987年   22篇
  1986年   15篇
  1985年   17篇
  1984年   10篇
  1983年   12篇
  1980年   5篇
  1979年   8篇
  1978年   8篇
  1977年   10篇
  1976年   10篇
  1974年   5篇
  1973年   7篇
  1966年   5篇
排序方式: 共有9837条查询结果,搜索用时 203 毫秒
1.
2.
School Mental Health - A dual approach to mental health in schools has been widely defended, where the assessment of psychological distress and the examination of strengths/well-being are two...  相似文献   
3.
4.
5.
ABSTRACT

Introduction

‘Critical Asthma Syndrome’ (CAS) is an umbrella term proposed to include several forms of asthma, responsible for acute and life-threatening exacerbations. CAS requires urgent and adequate supportive and pharmacological treatments to prevent serious outcomes.  相似文献   
6.
7.
Food-grade titanium dioxide (E171) is widely used as a food additive, and it is known that after oral consumption, E171 is translocated into the bloodstream reaching the highest titanium level at 6 h. E171 is accumulated in some organs triggering toxicity, but the effects on the blood parameters after oral consumption have been less studied. Recently, evidence shows that oral exposure to E171 induces behavioral signs of anxiety and depression. The relation between blood alterations and psychiatric disorders has been previously demonstrated. However, the oral exposure to E171 effects on alterations in blood parameters and effects linked to alterations in animal behavior has not been explored. In this short communication, we aimed to investigate the effects of E171 on specific blood parameters (hematocrit, hemoglobin, number of erythrocytes, and leukocytes) and anxiety and compulsive-like behavior in males and females orally exposed to ~5 mg/kg for 4 weeks. The results showed that E171 decreased hematocrit and hemoglobin in male but not in female mice while leukocyte and erythrocyte count remained unaltered. Oral consumption of E171 decreased the levels of anxiety-like behavior in females but not in male mice, while compulsive-like behavior was increased in both male and female mice.  相似文献   
8.
This randomized controlled trial evaluated the effect of a 5-week daily skin-to-skin contact (SSC) intervention between mothers and their full-term infants, compared with care-as-usual, on exclusive and continued breastfeeding duration during the first post-natal year. Healthy pregnant women (n = 116) from a community sample were enrolled and randomly allocated to the SSC or care-as-usual condition. SSC mothers were requested to provide one daily hour of SSC for the first five post-natal weeks. Twelve months post-partum, mothers indicated the number of exclusive and continued breastfeeding months. Multiple regression analyses were conducted using intention-to-treat, per-protocol and exploratory dose–response frameworks. In intention-to-treat analyses, exclusive and continued breastfeeding duration was not different between groups (exclusive: 3.61 ± 1.99 vs. 3.16 ± 1.77 months; adjusted mean difference 0.28, 95% confidence interval [CI] ?0.33 to 0.89; p = 0.36; continued: 7.98 ± 4.20 vs. 6.75 ± 4.06 months; adjusted mean difference 0.81, 95% CI ?0.46 to 2.08; p = 0.21). In per-protocol analyses, exclusive and continued breastfeeding duration was longer for SSC than care-as-usual dyads (exclusive: 4.89 ± 1.26 vs. 3.25 ± 1.80 months; adjusted mean difference 1.28, 95% CI 0.31–2.24; p = 0.01; continued: 10.81 ± 1.97 vs. 6.98 ± 4.08 months; adjusted mean difference 2.33, 95% CI 0.13–4.54; p = 0.04). Exploratory dose–response effects indicated that more SSC hours predicted longer exclusive and continued breastfeeding duration. This study demonstrates that for the total group, the 5-week daily SSC intervention did not extend exclusive and continued breastfeeding duration. However, for mothers performing a regular daily hour of SSC, this simple and accessible intervention may extend exclusive and continued breastfeeding duration by months. Future studies are required to confirm these promising findings. Trial registration: Netherlands Trial Register (NTR5697).  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