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   3354287篇
  免费   236718篇
  国内免费   6023篇
耳鼻咽喉   48019篇
儿科学   106018篇
妇产科学   92552篇
基础医学   485907篇
口腔科学   95168篇
临床医学   299434篇
内科学   645869篇
皮肤病学   74288篇
神经病学   265620篇
特种医学   127455篇
外国民族医学   897篇
外科学   509769篇
综合类   72280篇
现状与发展   17篇
一般理论   1251篇
预防医学   254262篇
眼科学   79864篇
药学   250506篇
  15篇
中国医学   6876篇
肿瘤学   180961篇
  2018年   35732篇
  2017年   27258篇
  2016年   30496篇
  2015年   34328篇
  2014年   48399篇
  2013年   73765篇
  2012年   100063篇
  2011年   106384篇
  2010年   63280篇
  2009年   60100篇
  2008年   100629篇
  2007年   108431篇
  2006年   109004篇
  2005年   106219篇
  2004年   102103篇
  2003年   98605篇
  2002年   95986篇
  2001年   149533篇
  2000年   153301篇
  1999年   129577篇
  1998年   37961篇
  1997年   33560篇
  1996年   33070篇
  1995年   31404篇
  1994年   29040篇
  1993年   27331篇
  1992年   100963篇
  1991年   98528篇
  1990年   96337篇
  1989年   93289篇
  1988年   86272篇
  1987年   84905篇
  1986年   80244篇
  1985年   77017篇
  1984年   57572篇
  1983年   49201篇
  1982年   29786篇
  1981年   26903篇
  1979年   53783篇
  1978年   38679篇
  1977年   32919篇
  1976年   30852篇
  1975年   33967篇
  1974年   40445篇
  1973年   38810篇
  1972年   36725篇
  1971年   34587篇
  1970年   32310篇
  1969年   30850篇
  1968年   28524篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
121.
122.

Background

The ZOE-50 (NCT01165177) and ZOE-70 (NCT01165229) phase 3 clinical trials showed that the adjuvanted recombinant zoster vaccine (RZV) was ≥90% efficacious in preventing herpes zoster in adults. Here we present a comprehensive overview of the safety data from these studies.

Methods

Adults aged ≥50 (ZOE-50) and ≥70 (ZOE-70) years were randomly vaccinated with RZV or placebo. Safety analyses were performed on the pooled total vaccinated cohort, consisting of participants receiving at least one dose of RZV or placebo. Solicited and unsolicited adverse events (AEs) were collected for 7 and 30?days after each vaccination, respectively. Serious AEs (SAEs) were collected from the first vaccination until 12?months post-last dose. Fatal AEs, vaccination-related SAEs, and potential immune-mediated diseases (pIMDs) were collected during the entire study period.

Results

Safety was evaluated in 14,645 RZV and 14,660 placebo recipients. More RZV than placebo recipients reported unsolicited AEs (50.5% versus 32.0%); the difference was driven by transient injection site and solicited systemic reactions that were generally seen in the first week post-vaccination. The occurrence of overall SAEs (RZV: 10.1%; Placebo: 10.4%), fatal AEs (RZV: 4.3%; Placebo: 4.6%), and pIMDs (RZV: 1.2%; Placebo: 1.4%) was balanced between groups. The occurrence of possible exacerbations of pIMDs was rare and similar between groups. Overall, except for the expected local and systemic symptoms, the safety results were comparable between the RZV and Placebo groups irrespective of participant age, gender, or race.

Conclusions

No safety concerns arose, supporting the favorable benefit-risk profile of RZV.  相似文献   
123.
124.
The Impella 5.0, a percutaneously inserted left ventricular assist device, has been used to support patients who have severe heart failure or who are undergoing high-risk percutaneous coronary intervention. We report our surgical placement of the Impella 5.0, through a graft sewn to the aorta, to unload the left ventricle of a 59-year-old man who was undergoing venoarterial extracorporeal membrane oxygenation for postcardiotomy shock. The patient underwent successful placement of a long-term left ventricular assist device before his discharge from the hospital. The versatility of the Impella 5.0 is exemplified in this patient who was successfully bridged to long-term support.  相似文献   
125.
126.
The jobs of Latino manual laborers place their mental and physical health at risk. This study evaluates the associations among musculoskeletal pain, mental health, and work organization in Latino manual laborers. Farmworkers and nonfarmworkers (n = 189) in North Carolina were interviewed for self-reported musculoskeletal pain, depressive symptoms, stress, work safety climate, and precarious job status. More nonfarmworkers than farmworkers had neck and shoulder pain, but they did not differ in other areas of musculoskeletal pain. Depressive symptoms had a significant association with neck and shoulder pain (p < .05). Precariousness had a significant association with back pain (p < .05). Farmworker participants had H-2A visas and were afforded some protection compared to nonfarmworker manual workers. Research is needed to improve policy that relieves pain and improves mental health for all Latino manual workers.  相似文献   
127.
128.
129.
Objective: To assess the quality of images and video clips of fetal central nervous (CNS) structures obtained by ultrasound and transmitted via tele-ultrasound from Brazil to Australia.

Methods: In this cross-sectional study, 15 normal singleton pregnant women between 20 and 26 weeks were selected. Fetal CNS structures were obtained by images and video clips. The exams were transmitted in real-time using a broadband internet and an inexpensive video streaming device. Four blinded examiners evaluated the quality of the exams using the Likert scale. We calculated the mean, standard deviation, mean difference, and p values were obtained from paired t tests.

Results: The quality of the original video clips was slightly better than that observed by the transmitted video clips; mean difference considering all observers = 0.23 points. In 47/60 comparisons (78.3%; 95% CI?=?66.4–86.9%) the quality of the video clips were judged to be the same. In 182/240 still images (75.8%; 95% CI?=?70.0–80.8%) the scores of transmitted image were considered the same as the original.

Conclusion: We demonstrated that long distance tele-ultrasound transmission of fetal CNS structures using an inexpensive video streaming device provided images of subjective good quality.  相似文献   
130.
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