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   2160838篇
  免费   149095篇
  国内免费   4166篇
耳鼻咽喉   31858篇
儿科学   68189篇
妇产科学   60679篇
基础医学   305518篇
口腔科学   63186篇
临床医学   188939篇
内科学   412475篇
皮肤病学   49139篇
神经病学   169378篇
特种医学   85218篇
外国民族医学   595篇
外科学   329155篇
综合类   48646篇
现状与发展   10篇
一般理论   687篇
预防医学   153728篇
眼科学   51762篇
药学   166759篇
  10篇
中国医学   5204篇
肿瘤学   122964篇
  2018年   21197篇
  2016年   19128篇
  2015年   21528篇
  2014年   29680篇
  2013年   44115篇
  2012年   59071篇
  2011年   62339篇
  2010年   36852篇
  2009年   35063篇
  2008年   58314篇
  2007年   63101篇
  2006年   63803篇
  2005年   61120篇
  2004年   59041篇
  2003年   56800篇
  2002年   55388篇
  2001年   104578篇
  2000年   107352篇
  1999年   90307篇
  1998年   24116篇
  1997年   21674篇
  1996年   21165篇
  1995年   19886篇
  1994年   18453篇
  1993年   17359篇
  1992年   69494篇
  1991年   67144篇
  1990年   65995篇
  1989年   64043篇
  1988年   59061篇
  1987年   57928篇
  1986年   55224篇
  1985年   52343篇
  1984年   38920篇
  1983年   33062篇
  1982年   19307篇
  1981年   17415篇
  1979年   36708篇
  1978年   25795篇
  1977年   22632篇
  1976年   20330篇
  1975年   23070篇
  1974年   27243篇
  1973年   26569篇
  1972年   25291篇
  1971年   23681篇
  1970年   22200篇
  1969年   21356篇
  1968年   19698篇
  1967年   17648篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
Summary: A female patient with isovaleric acidaemia had a successful outcome from pregnancy.  相似文献   
32.
33.
Although studies have documented underuse of controller medications and overuse of short-acting inhaled ss(2)-agonist among children with persistent asthma in disadvantaged communities, the persistence of oral ss(2)-agonist use in pediatric practice has not been studied since inhaled short-acting ss(2)-agonists became widespread. We describe medications used to treat asthma among children 3 to 5 years of age at 10 Head Start and other subsidized preschool centers in East and Central Harlem, New York City. We interviewed 149 parents/guardians of children who were identified as having probable asthma based on physician's diagnosis, persistent symptoms, hospitalization, and medication use. We classified 86 of the 149 children (58%) as having current persistent asthma. Only 15 of them (17%) were reported to have used controller medications at least 5 days/week in the last 4 weeks-only 2 of whom used inhaled corticosteroids. By contrast, 53 children (62%) used oral ss(2)-agonist in the last 4 weeks, often (72%) in conjunction with nebulized or inhaled short-acting ss(2)-agonist. Use of oral ss(2)-agonist was associated with more severe symptoms. This study documents the continued widespread use of oral ss(2)-agonist for treatment of children in a low-income community with high prevalence of asthma.  相似文献   
34.
35.
36.
37.
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   
38.
39.
Setting goals to maintain hope.   总被引:3,自引:0,他引:3  
  相似文献   
40.
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