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   3373130篇
  免费   268280篇
  国内免费   6045篇
耳鼻咽喉   48528篇
儿科学   107563篇
妇产科学   93037篇
基础医学   475047篇
口腔科学   99431篇
临床医学   306636篇
内科学   653114篇
皮肤病学   70344篇
神经病学   280735篇
特种医学   134311篇
外国民族医学   1247篇
外科学   506975篇
综合类   82929篇
现状与发展   4篇
一般理论   1426篇
预防医学   272181篇
眼科学   79794篇
药学   252312篇
  7篇
中国医学   6250篇
肿瘤学   175584篇
  2018年   33606篇
  2016年   28896篇
  2015年   33033篇
  2014年   46908篇
  2013年   71741篇
  2012年   96435篇
  2011年   101995篇
  2010年   60263篇
  2009年   57527篇
  2008年   97122篇
  2007年   102869篇
  2006年   104024篇
  2005年   101166篇
  2004年   98193篇
  2003年   94519篇
  2002年   93307篇
  2001年   153518篇
  2000年   158981篇
  1999年   134981篇
  1998年   39144篇
  1997年   35490篇
  1996年   34991篇
  1995年   33936篇
  1994年   31922篇
  1993年   29858篇
  1992年   109689篇
  1991年   106061篇
  1990年   102953篇
  1989年   99465篇
  1988年   92455篇
  1987年   91215篇
  1986年   86624篇
  1985年   83054篇
  1984年   63001篇
  1983年   54074篇
  1982年   32661篇
  1981年   29178篇
  1980年   27489篇
  1979年   59839篇
  1978年   42092篇
  1977年   35521篇
  1976年   33313篇
  1975年   35267篇
  1974年   43490篇
  1973年   41540篇
  1972年   38704篇
  1971年   36030篇
  1970年   33644篇
  1969年   31418篇
  1968年   28657篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Summary: A female patient with isovaleric acidaemia had a successful outcome from pregnancy.  相似文献   
42.
43.
44.
45.
46.
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   
47.
AIM: To evaluate whether the introduction of a strict protocol approach based on the systemic evaluation of critically ill pregnant women with complications of abortion affected outcome. SETTING: Indigent South Africans managed in the regional and tertiary hospitals of the Pretoria Academic Complex. METHOD: Since 1997 a standard definition of severe acute maternal morbidity (SAMM) has been used in the Pretoria Academic Complex. All cases of SAMM and maternal deaths were entered on the Maternal Morbidity and Mortality Audit System programme. A comparison of outcome of severely ill women who had complications of abortion was made between 1997-1998 (original protocol) and 2002-2004 (strict protocol). OUTCOME MEASURES: The mortality index and prevalence of organ system failure or dysfunction. RESULTS: In 1997-1998 there were 43 women with SAMM who survived and a further 10 maternal deaths due to complications of abortion, compared with 107 women with SAMM and 7 maternal deaths during 2002-2004. The mortality index declined from 18.9% in 1997-1998 to 6.1% in 2002-2004 (p = 0.02, odds ratio 0.28, 95% confidence limits 0.10 - 0.79). Significantly more women had hypovolaemic shock in 2002-2004 compared with 1997-1998 (54.4% v. 35.8%, p = 0.04), but fewer women had immune system failure including septic shock (18.4% v. 47.2%, p = 0.0002) and metabolic dysfunction (0 v. 5.7%, p = 0.03) and there was a trend to less renal failure (10.5% v. 22.6%, p = 0.06) and cardiac failure (4.4% v. 13.2%, p = 0.08). CONCLUSION: The strict protocol approach based on systemic evaluation in managing critically ill pregnant women with complications of abortion, coupled with an intensive, regular feedback mechanism, has been associated with a reduction in the mortality index.  相似文献   
48.
49.
50.
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