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   1432258篇
  免费   119722篇
  国内免费   6679篇
耳鼻咽喉   18558篇
儿科学   46641篇
妇产科学   38889篇
基础医学   195645篇
口腔科学   39921篇
临床医学   128063篇
内科学   300565篇
皮肤病学   34846篇
神经病学   118188篇
特种医学   57871篇
外国民族医学   275篇
外科学   223057篇
综合类   32076篇
现状与发展   2篇
一般理论   448篇
预防医学   115089篇
眼科学   30111篇
药学   100340篇
  5篇
中国医学   2766篇
肿瘤学   75303篇
  2019年   11729篇
  2018年   16843篇
  2017年   12798篇
  2016年   14925篇
  2015年   16508篇
  2014年   23151篇
  2013年   34394篇
  2012年   43258篇
  2011年   46656篇
  2010年   28387篇
  2009年   26954篇
  2008年   42293篇
  2007年   45020篇
  2006年   45824篇
  2005年   44398篇
  2004年   42268篇
  2003年   40948篇
  2002年   38572篇
  2001年   67977篇
  2000年   70088篇
  1999年   58182篇
  1998年   17317篇
  1997年   15538篇
  1996年   16408篇
  1995年   16601篇
  1994年   15412篇
  1993年   14392篇
  1992年   47594篇
  1991年   46151篇
  1990年   44375篇
  1989年   42128篇
  1988年   39060篇
  1987年   38353篇
  1986年   36108篇
  1985年   34863篇
  1984年   26519篇
  1983年   22272篇
  1982年   13988篇
  1981年   12596篇
  1980年   11835篇
  1979年   23691篇
  1978年   17187篇
  1977年   14460篇
  1976年   13256篇
  1975年   13781篇
  1974年   16195篇
  1973年   15474篇
  1972年   14238篇
  1971年   13119篇
  1970年   11941篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
52.
In the current immunosuppressive therapy era, vessel thrombosis is the most common cause of early graft loss after renal transplantation. The prevalence of IgA anti–β2-glycoprotein I antibodies (IgA-aB2GPI-ab) in patients on dialysis is elevated (>30%), and these antibodies correlate with mortality and cardiovascular morbidity. To evaluate the effect of IgA-aB2GPI-ab in patients with transplants, we followed all patients transplanted from 2000 to 2002 in the Hospital 12 de Octubre prospectively for 10 years. Presence of IgA-aB2GPI-ab in pretransplant serum was examined retrospectively. Of 269 patients, 89 patients were positive for IgA-aB2GPI-ab (33%; group 1), and the remaining patients were negative (67%; group 2). Graft loss at 6 months post-transplant was significantly higher in group 1 (10 of 89 versus 3 of 180 patients in group 2; P=0.002). The most frequent cause of graft loss was thrombosis of the vessels, which was observed only in group 1 (8 of 10 versus 0 of 3 patients in group 2; P=0.04). Multivariate analysis showed that the presence of IgA-aB2GPI-ab was an independent risk factor for early graft loss (P=0.04) and delayed graft function (P=0.04). There were no significant differences regarding patient survival between the two groups. Graft survival was similar in both groups after 6 months. In conclusion, patients with pretransplant IgA-aB2GPI-ab have a high risk of early graft loss caused by thrombosis and a high risk of delayed graft function. Therefore, pretransplant IgA-aB2GPI-ab may have a detrimental effect on early clinical outcomes after renal transplantation.  相似文献   
53.
54.
55.
56.
57.
58.
59.
60.
The current situation in which the humanities are disparaged affects all university disciplines, including nursing, in whose historical evolution the humanities have always been present in one form or another. Looking beyond this disrepute, this study proposes that nursing renew its attention to classical philosophy. Specifically, it invites a close reading of Xenophon's Anabasis and Plato's Meno, to get three related goals: to show how the use of ancient texts are very valuable tools for the philosophical initiation of nursing students and can help them reflect on their choice of nursing as a practical activity; to reflect on the problem of virtue and the nature of the good life; and to show how the interaction with ancient texts allows students to reflect on questions and issues of life, theirs and others, that are not open to investigation through a purely scientific method. Consequently, both Anabasis and Meno readings strengthen the intellectual relationship between philosophy and nursing, enabling the latter to delve deeper into the key questions of its own thought as a discipline.  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