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   712867篇
  免费   49498篇
  国内免费   1314篇
耳鼻咽喉   9231篇
儿科学   23462篇
妇产科学   17773篇
基础医学   111443篇
口腔科学   20077篇
临床医学   64593篇
内科学   135570篇
皮肤病学   16270篇
神经病学   50070篇
特种医学   25984篇
外国民族医学   76篇
外科学   105421篇
综合类   15011篇
现状与发展   2篇
一般理论   168篇
预防医学   52206篇
眼科学   16450篇
药学   54437篇
  3篇
中国医学   2374篇
肿瘤学   43058篇
  2019年   5522篇
  2018年   7970篇
  2017年   6183篇
  2016年   6891篇
  2015年   7651篇
  2014年   10425篇
  2013年   15618篇
  2012年   20796篇
  2011年   21812篇
  2010年   12902篇
  2009年   12086篇
  2008年   20271篇
  2007年   21810篇
  2006年   22210篇
  2005年   20732篇
  2004年   20272篇
  2003年   19237篇
  2002年   18768篇
  2001年   36577篇
  2000年   37148篇
  1999年   30596篇
  1998年   7982篇
  1997年   6734篇
  1996年   7046篇
  1995年   6696篇
  1994年   6176篇
  1993年   5663篇
  1992年   23131篇
  1991年   23092篇
  1990年   22468篇
  1989年   22226篇
  1988年   20176篇
  1987年   19563篇
  1986年   18606篇
  1985年   17447篇
  1984年   12797篇
  1983年   10823篇
  1982年   5972篇
  1979年   11585篇
  1978年   8183篇
  1977年   6882篇
  1976年   6633篇
  1975年   7329篇
  1974年   8553篇
  1973年   8201篇
  1972年   7712篇
  1971年   7171篇
  1970年   6924篇
  1969年   6343篇
  1968年   5818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.

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   
57.
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   
58.

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   
59.
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   
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