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   3938515篇
  免费   294021篇
  国内免费   6734篇
耳鼻咽喉   56596篇
儿科学   124627篇
妇产科学   105719篇
基础医学   566038篇
口腔科学   112510篇
临床医学   362070篇
内科学   752856篇
皮肤病学   83753篇
神经病学   320536篇
特种医学   151557篇
外国民族医学   1277篇
外科学   591152篇
综合类   89586篇
现状与发展   13篇
一般理论   1603篇
预防医学   318052篇
眼科学   93974篇
药学   294697篇
  89篇
中国医学   7559篇
肿瘤学   205006篇
  2018年   42284篇
  2017年   32106篇
  2016年   35839篇
  2015年   40456篇
  2014年   57813篇
  2013年   87961篇
  2012年   119568篇
  2011年   127068篇
  2010年   75597篇
  2009年   71547篇
  2008年   119641篇
  2007年   127403篇
  2006年   128644篇
  2005年   125022篇
  2004年   120283篇
  2003年   115730篇
  2002年   113310篇
  2001年   175112篇
  2000年   180613篇
  1999年   152841篇
  1998年   45637篇
  1997年   40474篇
  1996年   40052篇
  1995年   38362篇
  1994年   35760篇
  1993年   33582篇
  1992年   121628篇
  1991年   118662篇
  1990年   115319篇
  1989年   111108篇
  1988年   102975篇
  1987年   101124篇
  1986年   95476篇
  1985年   91748篇
  1984年   69287篇
  1983年   59114篇
  1982年   35832篇
  1981年   32061篇
  1979年   64998篇
  1978年   46104篇
  1977年   38697篇
  1976年   36889篇
  1975年   39095篇
  1974年   47671篇
  1973年   45386篇
  1972年   42899篇
  1971年   40137篇
  1970年   37375篇
  1969年   35170篇
  1968年   32301篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
43.
44.
Summary: A female patient with isovaleric acidaemia had a successful outcome from pregnancy.  相似文献   
45.
46.
47.
48.
49.
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   
50.
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   
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