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   2053786篇
  免费   158929篇
  国内免费   7653篇
耳鼻咽喉   27328篇
儿科学   66364篇
妇产科学   57121篇
基础医学   284972篇
口腔科学   56509篇
临床医学   180899篇
内科学   417025篇
皮肤病学   47014篇
神经病学   167165篇
特种医学   83830篇
外国民族医学   596篇
外科学   322043篇
综合类   47039篇
现状与发展   2篇
一般理论   637篇
预防医学   159806篇
眼科学   44929篇
药学   145528篇
  5篇
中国医学   3727篇
肿瘤学   107829篇
  2018年   20521篇
  2016年   18597篇
  2015年   21022篇
  2014年   29703篇
  2013年   44996篇
  2012年   57000篇
  2011年   60961篇
  2010年   37765篇
  2009年   36508篇
  2008年   57497篇
  2007年   61449篇
  2006年   62448篇
  2005年   60887篇
  2004年   58095篇
  2003年   56528篇
  2002年   54381篇
  2001年   96625篇
  2000年   99529篇
  1999年   83724篇
  1998年   24557篇
  1997年   22136篇
  1996年   22842篇
  1995年   22475篇
  1994年   21122篇
  1993年   19765篇
  1992年   68259篇
  1991年   65994篇
  1990年   63934篇
  1989年   61080篇
  1988年   56699篇
  1987年   55676篇
  1986年   52909篇
  1985年   50853篇
  1984年   38591篇
  1983年   32631篇
  1982年   20169篇
  1981年   17934篇
  1980年   16988篇
  1979年   35042篇
  1978年   25132篇
  1977年   21201篇
  1976年   19678篇
  1975年   20962篇
  1974年   24843篇
  1973年   23710篇
  1972年   22245篇
  1971年   20494篇
  1970年   19016篇
  1969年   17902篇
  1968年   16844篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
55.
56.
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   
57.
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   
58.
59.
PURPOSE: To determine the maximum tolerated dose, dose-limiting toxicities, and pharmacokinetic characteristics of doxorubicin encapsulated in a low temperature sensitive liposome (LTSL) when given concurrently with local hyperthermia to canine solid tumors. EXPERIMENTAL DESIGN: Privately owned dogs with solid tumors (carcinomas or sarcomas) were treated. The tumors did not involve bone and were located at sites amenable to local hyperthermia. LTSL-doxorubicin was given (0.7-1.0 mg/kg i.v.) over 30 minutes during local tumor hyperthermia in a standard phase I dose escalation study. Three treatments, given 3 weeks apart, were scheduled. Toxicity was monitored for an additional month. Pharmacokinetics were evaluated during the first treatment cycle. RESULTS: Twenty-one patients were enrolled: 18 with sarcomas and 3 with carcinomas. Grade 4 neutropenia and acute death secondary to liver failure, possibly drug related, were the dose-limiting toxicities. The maximum tolerated dose was 0.93 mg/kg. Other toxicities, with the possible exception of renal damage, were consistent with those observed following free doxorubicin administration. Of the 20 dogs that received > or = 2 doses of LTSL-doxorubicin, 12 had stable disease, and 6 had a partial response to treatment. Pharmacokinetic variables were more similar to those of free doxorubicin than the marketed liposomal product. Tumor drug concentrations at a dose of 1.0 mg/kg averaged 9.12 +/- 6.17 ng/mg tissue. CONCLUSION: LTSL-doxorubicin offers a novel approach to improving drug delivery to solid tumors. It was well tolerated and resulted in favorable response profiles in these patients. Additional evaluation in human patients is warranted.  相似文献   
60.
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