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   707518篇
  免费   48872篇
  国内免费   1300篇
耳鼻咽喉   9173篇
儿科学   23283篇
妇产科学   17606篇
基础医学   110574篇
口腔科学   20010篇
临床医学   63851篇
内科学   134733篇
皮肤病学   16313篇
神经病学   49585篇
特种医学   25782篇
外国民族医学   76篇
外科学   104704篇
综合类   14824篇
现状与发展   2篇
一般理论   160篇
预防医学   51446篇
眼科学   16348篇
药学   54020篇
  3篇
中国医学   2359篇
肿瘤学   42838篇
  2021年   5470篇
  2018年   7901篇
  2017年   6142篇
  2016年   6872篇
  2015年   7585篇
  2014年   10290篇
  2013年   15423篇
  2012年   20577篇
  2011年   21592篇
  2010年   12767篇
  2009年   11975篇
  2008年   20063篇
  2007年   21591篇
  2006年   21991篇
  2005年   20501篇
  2004年   20064篇
  2003年   19011篇
  2002年   18519篇
  2001年   36374篇
  2000年   36943篇
  1999年   30423篇
  1998年   7897篇
  1997年   6675篇
  1996年   6979篇
  1995年   6637篇
  1994年   6103篇
  1993年   5594篇
  1992年   22994篇
  1991年   22950篇
  1990年   22332篇
  1989年   22098篇
  1988年   20059篇
  1987年   19437篇
  1986年   18495篇
  1985年   17321篇
  1984年   12717篇
  1983年   10755篇
  1982年   5924篇
  1979年   11527篇
  1978年   8141篇
  1977年   6835篇
  1976年   6599篇
  1975年   7273篇
  1974年   8506篇
  1973年   8151篇
  1972年   7661篇
  1971年   7130篇
  1970年   6885篇
  1969年   6314篇
  1968年   5788篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.

Aims

Variations of the anatomy of donor hepatic arteries increase the number of arterial anastomoses during liver transplantation and, possibly, the incidence of hepatic artery thrombosis (HAT). In this study, we describe the arterial anatomic variations in liver grafts procured and transplanted by a single center in Greece, the techniques of arterial anastomosis, and their effect on the incidence of early HAT.

Materials and Methods

From January 2013 to December 2017, the arterial anatomy of 116 grafts procured for liver transplantation were recorded, as well as the technique of arterial anastomosis and the incidence of early hepatic artery thrombosis (HAT <30 days).

Results

A single hepatic artery was recorded in 72.41% of the procured grafts, an aberrant left hepatic artery (accessory or replaced) in 18 grafts (15.52%), and an aberrant right hepatic artery (accessory or replaced) in 17 grafts (14.66%), while other variations were observed in less than 1% of the procured livers. Of the 116 primary liver transplantations, 6 patients (5.17%) developed early HAT <30 days. Two of these patients (1.72%) had 1 anastomosis of the hepatic artery and 4 (3.45%) had 2 anastomoses due to anatomic variations.

Conclusions

Anatomic variations of the hepatic artery in liver grafts is a common finding and increase the incidence of early HAT but not to a degree to make these grafts unusable.  相似文献   
62.
Hawi  N.  von Falck  C.  Krettek  C.  Meller  R. 《Der Unfallchirurg》2019,122(12):944-949
Die Unfallchirurgie - Zur Diagnostik von Schultergelenkerkrankungen wird routinemäßig die Magnetresonanztomographie (MRT) durchgeführt. Diese kann entsprechend der klinischen...  相似文献   
63.

Introduction

The fast track / ultra-fast-track protocols are techniques used to optimise the patient care process and a quick recovery after cardiac surgery. They are one of the mainstays of efficient practice. With their use, the length of hospital and intensive care unit (ICU) stays are reduced, with a direct impact on costs and the quality of the health service.

Objective

To compare the length of stay in the ICU, length of hospital stay, and post-operative mortality in ultra-fast-track extubated (uFTE) patients and those with conventional extubation (CE) after cardiac surgery.

Methods

Longitudinal, analytical, retrospective study was conducted, with the period between the time of surgery and discharge being included as the study period.

Results

A total of 396 patients older than 18 years who required cardiac surgery were included, of whom 207 patients had (uFTE) and 189 had CE. Although the groups were not comparable due to the statistical differences found, when performing the multivariate adjustment, uFTE maintained its statistical independence and was associated with lower cardiovascular morbidity, such as myocardial ischaemia (95% CI: 0.37-0.86; P = .01) and lower post-surgical vasopressor requirement (95% CI: 0.18-0.49; P < .01). No significant differences were found in the length of hospital stay, ICU stay, or post-operative mortality in the ICU.

Conclusion

Implementing the uFTE strategy, decreases cardiovascular morbidity and vasopressor requirement. The change to uFTE should be accompanied by changes in models and practices in patient recovery to standardised protocols. This study shows that uFTE did not reduce the length of ICU stay, hospital stay, or mortality.  相似文献   
64.
Pharmaceutical Chemistry Journal - Use of formylindolylacetic acid as a reagent at the stage of preparing the glycosides of bis(indolyl)furan-2,5-diones and dioxane as solvent increased yields from...  相似文献   
65.
66.
67.
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