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   709962篇
  免费   48975篇
  国内免费   1314篇
耳鼻咽喉   9209篇
儿科学   23388篇
妇产科学   17630篇
基础医学   110906篇
口腔科学   20092篇
临床医学   64009篇
内科学   135371篇
皮肤病学   16213篇
神经病学   49790篇
特种医学   25832篇
外国民族医学   76篇
外科学   105065篇
综合类   14848篇
现状与发展   2篇
一般理论   160篇
预防医学   51471篇
眼科学   16550篇
药学   54285篇
  3篇
中国医学   2366篇
肿瘤学   42985篇
  2021年   5491篇
  2018年   7920篇
  2017年   6168篇
  2016年   6885篇
  2015年   7633篇
  2014年   10332篇
  2013年   15484篇
  2012年   20684篇
  2011年   21678篇
  2010年   12832篇
  2009年   12038篇
  2008年   20195篇
  2007年   21734篇
  2006年   22098篇
  2005年   20617篇
  2004年   20151篇
  2003年   19136篇
  2002年   18648篇
  2001年   36509篇
  2000年   37061篇
  1999年   30524篇
  1998年   7935篇
  1997年   6693篇
  1996年   7022篇
  1995年   6658篇
  1994年   6118篇
  1993年   5609篇
  1992年   23059篇
  1991年   23000篇
  1990年   22370篇
  1989年   22144篇
  1988年   20102篇
  1987年   19487篇
  1986年   18544篇
  1985年   17355篇
  1984年   12744篇
  1983年   10775篇
  1982年   5936篇
  1979年   11546篇
  1978年   8138篇
  1977年   6844篇
  1976年   6603篇
  1975年   7291篇
  1974年   8520篇
  1973年   8152篇
  1972年   7678篇
  1971年   7139篇
  1970年   6889篇
  1969年   6321篇
  1968年   5795篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.

Introduction The focus in clinical pharmacy practice is and has for the last 30–35 years been on changing the role of pharmacy staff into service orientation and patient counselling. One way of doing this is by involving staff in change process and as a researcher to take part in the change process by establishing partnerships with staff. On the background of the authors’ widespread action research (AR)-based experiences, recommendations and comments for how to conduct an AR-study is described, and one of their AR-based studies illustrate the methodology and the research methods used. Methodology AR is defined as an approach to research which is based on a problem-solving relationship between researchers and clients, which aims at both solving a problem and at collaboratively generating new knowledge. Research questions relevant in AR-studies are: what was the working process in this change oriented study? What learning and/or changes took place? What challenges/pitfalls had to be overcome? What were the influence/consequences for the involved parts? When to use If you want to implement new services and want to involve staff and others in the process, an AR methodology is very suitable. The basic advantages of doing AR-based studies are grounded in their participatory and democratic basis and their starting point in problems experienced in practice. Limitations Some of the limitations in AR-studies are that neither of the participants in a project steering group are the only ones to decide. Furthermore, the collective process makes the decision-making procedures relatively complex.

  相似文献   
52.
53.
54.
Traditionally, major complications and unanticipated admission/readmission rates were used to assess outcome after day surgery. However, in view of the relative absence of major complications the quality of recovery (QOR) should be considered one of the principal endpoints after day surgery. In our study, the level of QOR is defined by a combination of the Global Surgical Recovery (GSR) Index and the Quality of Life (QOL).The aim of this study was to analyze prevalence and predictors of QOR after day surgery on the fourth postoperative day.Elective patients scheduled for day surgery from November 2008 to April 2010 were enrolled in a prospective cohort study. Outcome parameters were measured by using questionnaire packages at 2 time points: 1 week preoperatively and 4 days postoperatively. Primary outcome parameter is the QOR and is defined as good if the GSR index >80% as well as the postoperative QOL is unchanged or improved as compared with baseline. QOR is defined as poor if both the GSR index ≤80% and if the postoperative QOL is decreased as compared with baseline. QOR is defined as intermediate in all other cases. Three logistic regression analyses were performed to determine predictors for poor QOR after day surgery.A total of 1118 patients were included. A good QOR was noted in 17.3% of patients, an intermediate QOR in 34.8%, and a poor QOR in 47.8% 4 days after day surgery. The best predictor for poor QOR after day surgery was type of surgery. Other predictors were younger age, work status, and longer duration of surgery. A history of previous surgery, expected pain (by the patient) and high long-term surgical fear were significant predictors of poor QOR in only 1 of 3 prediction models.The QOR at home 4 days after day surgery was poor in the majority of patients and showed a significant procedure-specific variation. Patients at risk for poor QOR can be identified during the preoperative period based on type of surgery, age, work status, and the duration of the surgery.  相似文献   
55.
56.
57.
58.
59.
60.

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   
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