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   1453112篇
  免费   102367篇
  国内免费   3466篇
耳鼻咽喉   21195篇
儿科学   43202篇
妇产科学   40738篇
基础医学   202283篇
口腔科学   42468篇
临床医学   124255篇
内科学   286047篇
皮肤病学   31769篇
神经病学   116666篇
特种医学   58200篇
外国民族医学   435篇
外科学   227036篇
综合类   32722篇
现状与发展   7篇
一般理论   605篇
预防医学   102951篇
眼科学   33863篇
药学   108390篇
  6篇
中国医学   3150篇
肿瘤学   82957篇
  2018年   14295篇
  2016年   12519篇
  2015年   14213篇
  2014年   20143篇
  2013年   30547篇
  2012年   40659篇
  2011年   42961篇
  2010年   25322篇
  2009年   24372篇
  2008年   40776篇
  2007年   44476篇
  2006年   44678篇
  2005年   43492篇
  2004年   42382篇
  2003年   40905篇
  2002年   40295篇
  2001年   64694篇
  2000年   66211篇
  1999年   56571篇
  1998年   16063篇
  1997年   14576篇
  1996年   14027篇
  1995年   13249篇
  1994年   12341篇
  1992年   43463篇
  1991年   42006篇
  1990年   41180篇
  1989年   40163篇
  1988年   37588篇
  1987年   37004篇
  1986年   35525篇
  1985年   33810篇
  1984年   25595篇
  1983年   21754篇
  1982年   13620篇
  1981年   12523篇
  1980年   11587篇
  1979年   24423篇
  1978年   17601篇
  1977年   15321篇
  1976年   13818篇
  1975年   15655篇
  1974年   18468篇
  1973年   17930篇
  1972年   17061篇
  1971年   15973篇
  1970年   15138篇
  1969年   14517篇
  1968年   13613篇
  1967年   12135篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
22.
23.
24.
AIM: Cardiovascular risk factors can be present in children and young adults. We previously found abnormal microvascular function in children who had glucose intolerance and insulin resistance. The aim of the present study was to investigate whether they also have abnormalities in left ventricular mass (LVM) and arterial stiffness. METHODS: We measured heart dimensions and LVM using echocardiography, and arterial stiffness using pulse wave analysis in 23 children with good glucose handling (postfeeding glucose: 3.9 to 5 mmol/L) and 21 with poor glucose handling (7.7 to 11.4 mmol/L). RESULTS: The time to pulse reflection was slightly shorter in the poorer glucose handlers (mean+/-SD: 143+/-10 vs 153+/-20 ms, P=0.04), suggestive of increased arterial stiffness. Also in this group, there were significant relationships between intraventricular septal thickness, blood pressure and body mass index, but not in the normal glucose handlers. CONCLUSIONS: We have found that normal children who are in the lowest quintile of glucose tolerance in comparison with their peers are exhibiting the first signs of arterial stiffening. In addition, we have seen the beginnings of a relationship between blood pressure, body mass index and left ventricular enlargement in this group. While these changes may not yet be clinically significant, their emergence might be further evidence of early predisposition to cardiovascular disease.  相似文献   
25.
Setting goals to maintain hope.   总被引:3,自引:0,他引:3  
  相似文献   
26.
27.
28.
29.
30.
Abstract: Background: Fetal pulse oximetry improves the assessment of fetal well‐being during labor. The objective of this study was to evaluate women's satisfaction with their experience with this additional technology. Methods: We surveyed women participating in the FOREMOST trial, a randomized controlled trial comparing the addition of fetal pulse oximetry (FPO) to conventional cardiotocograph (CTG) monitoring (intervention group), versus CTG‐only (control group), in the presence of nonreassuring fetal status during labor. Our survey evaluated 3 aspects of women's experience: labor, fetal monitoring, and participation in the research. The survey was administered within a few days of giving birth and repeated 3 months later. Results: No differences were found between the intervention and control groups for women's evaluations of their labor, fetal monitoring, research, or overall experiences when surveyed on both occasions. Within each study group, a small but statistically significant decline occurred in women's scores for their experience of labor and overall experience from the initial survey close to the time of giving birth, to 3 months later. The magnitude of differences in responses over time was similar for the both groups. Women were more satisfied after a spontaneous or assisted vaginal birth than after cesarean section. Length of time the research midwife was present had a significant positive effect on women's ratings of their experience several days after giving birth (p = 0.006), but no effect at 3 months. Conclusions: The addition of fetal pulse oximetry for the assessment of fetal well‐being during labor did not affect childbearing women's perceptions of fetal monitoring or their labor. Women evaluated their experience in the research process positively overall. Small changes occurred in women's perception of their satisfaction over time. (BIRTH 33:2 June 2006)  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