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   3927480篇
  免费   278306篇
  国内免费   7368篇
耳鼻咽喉   54861篇
儿科学   128247篇
妇产科学   108083篇
基础医学   564812篇
口腔科学   112453篇
临床医学   357550篇
内科学   751641篇
皮肤病学   87299篇
神经病学   311064篇
特种医学   147510篇
外国民族医学   994篇
外科学   591039篇
综合类   87806篇
现状与发展   14篇
一般理论   1481篇
预防医学   305921篇
眼科学   94719篇
药学   288815篇
  13篇
中国医学   8430篇
肿瘤学   210402篇
  2019年   31164篇
  2018年   43475篇
  2017年   32959篇
  2016年   36684篇
  2015年   41539篇
  2014年   58863篇
  2013年   88505篇
  2012年   121469篇
  2011年   129172篇
  2010年   77206篇
  2009年   72306篇
  2008年   120874篇
  2007年   128538篇
  2006年   129946篇
  2005年   125830篇
  2004年   121050篇
  2003年   116068篇
  2002年   112488篇
  2001年   179130篇
  2000年   184097篇
  1999年   155160篇
  1998年   44851篇
  1997年   39487篇
  1996年   39407篇
  1995年   37263篇
  1994年   34426篇
  1993年   32232篇
  1992年   120765篇
  1991年   117245篇
  1990年   114071篇
  1989年   110256篇
  1988年   101448篇
  1987年   99520篇
  1986年   94057篇
  1985年   90003篇
  1984年   67289篇
  1983年   57471篇
  1982年   33916篇
  1979年   61909篇
  1978年   43707篇
  1977年   36868篇
  1976年   34856篇
  1975年   37398篇
  1974年   45443篇
  1973年   43672篇
  1972年   40853篇
  1971年   38312篇
  1970年   35824篇
  1969年   33817篇
  1968年   31495篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
93.
94.
95.
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   
96.
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   
97.
98.
99.
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   
100.
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