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   2650169篇
  免费   193842篇
  国内免费   4924篇
耳鼻咽喉   38019篇
儿科学   84065篇
妇产科学   76154篇
基础医学   371601篇
口腔科学   79762篇
临床医学   229905篇
内科学   513787篇
皮肤病学   58470篇
神经病学   213522篇
特种医学   105614篇
外国民族医学   883篇
外科学   404258篇
综合类   64401篇
现状与发展   9篇
一般理论   918篇
预防医学   196345篇
眼科学   62345篇
药学   199899篇
  53篇
中国医学   5391篇
肿瘤学   143534篇
  2018年   24179篇
  2015年   24306篇
  2014年   33762篇
  2013年   51751篇
  2012年   68819篇
  2011年   72760篇
  2010年   43179篇
  2009年   41356篇
  2008年   69847篇
  2007年   74723篇
  2006年   75666篇
  2005年   73613篇
  2004年   72065篇
  2003年   69506篇
  2002年   68276篇
  2001年   122400篇
  2000年   126161篇
  1999年   107441篇
  1998年   29306篇
  1997年   26638篇
  1996年   26129篇
  1995年   25113篇
  1994年   23624篇
  1993年   22161篇
  1992年   86612篇
  1991年   83998篇
  1990年   82244篇
  1989年   80167篇
  1988年   74628篇
  1987年   73459篇
  1986年   70128篇
  1985年   67274篇
  1984年   50407篇
  1983年   43262篇
  1982年   25686篇
  1981年   23235篇
  1980年   21774篇
  1979年   48309篇
  1978年   34082篇
  1977年   29100篇
  1976年   26846篇
  1975年   29323篇
  1974年   35494篇
  1973年   34232篇
  1972年   32059篇
  1971年   30140篇
  1970年   28155篇
  1969年   26748篇
  1968年   24876篇
  1967年   22407篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
Summary: A female patient with isovaleric acidaemia had a successful outcome from pregnancy.  相似文献   
32.
33.
34.
35.
36.
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   
37.
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   
38.
Setting goals to maintain hope.   总被引:3,自引:0,他引:3  
  相似文献   
39.
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