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   1312855篇
  免费   96368篇
  国内免费   2039篇
耳鼻咽喉   18439篇
儿科学   43329篇
妇产科学   38545篇
基础医学   191864篇
口腔科学   36411篇
临床医学   112917篇
内科学   258264篇
皮肤病学   27075篇
神经病学   102249篇
特种医学   51400篇
外国民族医学   367篇
外科学   201894篇
综合类   27427篇
现状与发展   1篇
一般理论   323篇
预防医学   97101篇
眼科学   29740篇
药学   100804篇
  1篇
中国医学   2543篇
肿瘤学   70568篇
  2018年   12452篇
  2016年   10570篇
  2015年   12208篇
  2014年   16780篇
  2013年   25558篇
  2012年   35226篇
  2011年   37645篇
  2010年   22184篇
  2009年   20928篇
  2008年   36596篇
  2007年   39639篇
  2006年   40171篇
  2005年   39395篇
  2004年   37829篇
  2003年   36748篇
  2002年   36291篇
  2001年   59199篇
  2000年   60647篇
  1999年   51760篇
  1998年   14718篇
  1997年   13179篇
  1996年   13446篇
  1995年   12724篇
  1994年   12069篇
  1993年   11223篇
  1992年   41833篇
  1991年   41181篇
  1990年   40649篇
  1989年   39444篇
  1988年   36787篇
  1987年   36053篇
  1986年   34432篇
  1985年   32789篇
  1984年   24473篇
  1983年   21292篇
  1982年   12697篇
  1981年   11209篇
  1979年   23073篇
  1978年   16224篇
  1977年   13999篇
  1976年   13248篇
  1975年   14425篇
  1974年   17009篇
  1973年   16389篇
  1972年   15600篇
  1971年   14497篇
  1970年   13452篇
  1969年   13004篇
  1968年   12218篇
  1967年   10673篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
The normal function of the hypothalamic-pituitary-adrenal (HPA) axis, and resultant glucocorticoid (GC) secretion, is essential for human health. Disruption of GC regulation is associated with pathologic, psychological, and physiological disease states such as depression, post-traumatic stress disorder, hypertension, diabetes, and osteopenia, among others. As such, understanding the mechanisms by which HPA output is tightly regulated in its responses to environmental stressors and circadian cues has been an active area of investigation for decades. Over the last 20 years, however, advances in gene targeting and genome modification in rodent models have allowed the detailed dissection of roles for key molecular mediators and brain regions responsible for this control in vivo to emerge. Here, we summarize work done to elucidate the function of critical neuropeptide systems, GC-signaling targets, and inflammation-associated pathways in HPA axis regulation and behavior, and highlight areas for future investigation.  相似文献   
73.
74.
75.
76.
77.

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   
78.

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   
79.
80.
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