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   3402173篇
  免费   231855篇
  国内免费   8739篇
耳鼻咽喉   45882篇
儿科学   110401篇
妇产科学   92067篇
基础医学   475373篇
口腔科学   94657篇
临床医学   310720篇
内科学   664663篇
皮肤病学   77459篇
神经病学   279302篇
特种医学   131382篇
外国民族医学   952篇
外科学   504974篇
综合类   73086篇
现状与发展   5篇
一般理论   1298篇
预防医学   267369篇
眼科学   75118篇
药学   247961篇
  84篇
中国医学   6643篇
肿瘤学   183371篇
  2019年   27288篇
  2018年   37187篇
  2017年   28534篇
  2016年   32805篇
  2015年   36892篇
  2014年   51094篇
  2013年   77198篇
  2012年   102113篇
  2011年   108292篇
  2010年   65254篇
  2009年   62462篇
  2008年   100964篇
  2007年   107459篇
  2006年   109252篇
  2005年   105048篇
  2004年   101249篇
  2003年   97663篇
  2002年   94089篇
  2001年   162200篇
  2000年   166632篇
  1999年   140204篇
  1998年   40515篇
  1997年   36033篇
  1996年   36488篇
  1995年   35450篇
  1994年   32713篇
  1993年   30600篇
  1992年   110505篇
  1991年   106697篇
  1990年   103352篇
  1989年   99520篇
  1988年   91422篇
  1987年   89830篇
  1986年   84509篇
  1985年   80779篇
  1984年   60529篇
  1983年   51234篇
  1982年   30452篇
  1981年   27286篇
  1979年   53976篇
  1978年   38365篇
  1977年   32375篇
  1976年   30075篇
  1975年   32100篇
  1974年   38092篇
  1973年   36338篇
  1972年   33952篇
  1971年   31498篇
  1970年   28974篇
  1969年   27555篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
63.
64.
65.
Infections due to Penicillium species other than P.marneffei are rare. We identified a boy with X-linked chronic granulomatous disease (X-CGD) with a pulmonary nodule and adjacent rib osteomyelitis caused by Penicillium piceum. The only sign of infection was an elevated sedimentation rate. P. piceum was isolated by fine needle aspirate and from excised infected tissues. Surgical removal and one year of voriconazole treatment were very well tolerated and led to complete recovery. Microbiological, microscopic and molecular studies support the fungal diagnosis. P. piceum should be considered as a relevant pathogen in immunocompromised patients.  相似文献   
66.
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   
67.
ABSTRACT: Background: Although increases in perinatal mortality risk associated with fetal macrosomia are well documented, the optimal route of delivery for fetuses with suspected macrosomia remains controversial. The objective of this investigation was to assess the risk of neonatal death among macrosomic infants delivered vaginally compared with those delivered by cesarean section. Methods: Data were derived from the U.S. 1995–1999 Linked Live Birth‐Infant Death Cohort files and term (37–44 wk), single live births to United States resident mothers selected. A proportional hazards model was used to analyze the risk of neonatal death associated with cesarean delivery among 3 categories of macrosomic infants (infants weighing 4,000–4,499 g; 4,500–4,999 g; and 5,000+ g). Results: After controlling for maternal characteristics and complications, the adjusted hazard ratio for neonatal death associated with cesarean delivery among the 3 categories of macrosomic infants was 1.40, 1.30, and 0.85. Conclusions: Although cesarean delivery may reduce the risk of death for the heaviest infants (5,000+ g), the relative benefit of this intervention for macrosomic infants weighing 4,000–4,999 g remains debatable. Thus, policies in support of prophylactic cesarean delivery for suspected fetal macrosomia may need to be reevaluated. (BIRTH 33:4 December 2006)  相似文献   
68.
69.
70.
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