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   1591203篇
  免费   117954篇
  国内免费   3622篇
耳鼻咽喉   20982篇
儿科学   53662篇
妇产科学   43397篇
基础医学   237973篇
口腔科学   45318篇
临床医学   144432篇
内科学   304834篇
皮肤病学   36434篇
神经病学   120959篇
特种医学   60269篇
外国民族医学   376篇
外科学   237995篇
综合类   36307篇
现状与发展   2篇
一般理论   522篇
预防医学   121611篇
眼科学   36828篇
药学   117798篇
  6篇
中国医学   4095篇
肿瘤学   88979篇
  2018年   17093篇
  2017年   13298篇
  2016年   14994篇
  2015年   16790篇
  2014年   22927篇
  2013年   34874篇
  2012年   46098篇
  2011年   48870篇
  2010年   29157篇
  2009年   27465篇
  2008年   45567篇
  2007年   48657篇
  2006年   49378篇
  2005年   46904篇
  2004年   45798篇
  2003年   43898篇
  2002年   42528篇
  2001年   76922篇
  2000年   78805篇
  1999年   65517篇
  1998年   17927篇
  1997年   15680篇
  1996年   16000篇
  1995年   15246篇
  1994年   14098篇
  1993年   13147篇
  1992年   51539篇
  1991年   50597篇
  1990年   49651篇
  1989年   48498篇
  1988年   44135篇
  1987年   43662篇
  1986年   41025篇
  1985年   39379篇
  1984年   29169篇
  1983年   24652篇
  1982年   14299篇
  1981年   12826篇
  1979年   26761篇
  1978年   19161篇
  1977年   16134篇
  1976年   15398篇
  1975年   16470篇
  1974年   19655篇
  1973年   18866篇
  1972年   17572篇
  1971年   16295篇
  1970年   15387篇
  1969年   14284篇
  1968年   13191篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
Haemophilia is a common cause of genetically inherited bleeding disorders. Pseudotumours occur in 1–2 % of persons with severe forms of haemophilia. These are a result of repeated haemorrhage into soft tissues, subperiosteum or a site of bone fracture with inadequate resorption of the extravasated blood. There are a number of therapeutic alternatives for this dangerous condition: surgical removal, percutaneous management, irradiation, embolization etc. In this case report, we describe the natural history, clinical course and successful surgical management of a patient with haemophilia who presented with a massive pseudotumour. We also briefly review the relevant literature on the various therapeutic modalities that have been implemented in the management of this rare complication. Though surgeons may be averse to operate on haemophiliacs, primary surgical management as done in our case may prove to be the definitive treatment option for such patients.  相似文献   
62.
63.
64.
Vaskulitiden     
  相似文献   
65.
Red cell exchange (RCE) is a common procedure in adults with sickle cell disease (SCD). Implantable dual lumen Vortex (DLV) ports can be used for RCE in patients with poor peripheral venous access. We performed a retrospective cohort study of RCE procedures performed in adults with SCD. The main objective of the study was to compare the inlet speed, duration of procedures and rate of complications performed through DLV ports to those performed through temporary central venous and peripheral catheters. Twenty‐nine adults with SCD underwent a total of 318 RCE procedures. Twenty adults had DLV ports placed and 218 procedures were performed using DLV ports. Mean length of follow‐up after DLV port placement was 397 ± 263 days. Six DLV ports were removed due to infection and 1 for malfunction after a mean of 171 ± 120 days. Compared to temporary central venous and peripheral catheters, DLV port procedures had a greater rate of procedural complications, a longer duration, and a lower inlet speed (all P < 0.01). When accounting for the maximum allowable inlet speed to avoid citrate toxicity, 40% of DLV port procedures were greater than 10% below maximum speed, compared to 7 and 14% of procedures performed through temporary central venous and peripheral catheters (P < 0.0001). In conclusion, DLV ports can be used for RCE in adults with SCD, albeit with more procedural complications and longer duration. The smaller internal diameter and longer catheter of DLV ports compared to temporary central venous catheters likely accounts for the differences noted. J. Clin. Apheresis 30:353–358, 2015. © 2015 Wiley Periodicals, Inc.  相似文献   
66.
67.
Preimplantation genetic diagnosis (PGD) was originally developed to diagnose embryo-related genetic abnormalities for couples who present a high risk of a specific inherited disorder. Because this technology involves embryo selection, the medical, bioethical, and legal implications of the technique have been debated, particularly when it is used to select features that are not related to serious diseases. Although several initiatives have attempted to achieve regulatory harmonization, the diversity of healthcare services available and the presence of cultural differences have hampered attempts to achieve this goal. Thus, in different countries, the provision of PGD and regulatory frameworks reflect the perceptions of scientific groups, legislators, and society regarding this technology. In Brazil, several texts have been analyzed by the National Congress to regulate the use of assisted reproduction technologies. Legislative debates, however, are not conclusive, and limited information has been published on how PGD is specifically regulated. The country requires the development of new regulatory standards to ensure adequate access to this technology and to guarantee its safe practice. This study examined official documents published on PGD regulation in Brazil and demonstrated how little direct oversight of PGD currently exists. It provides relevant information to encourage reflection on a particular regulation model in a Brazilian context, and should serve as part of the basis to enable further reform of the clinical practice of PGD in the country.  相似文献   
68.
69.
70.
A 42‐year‐old man presented with a viral prodrome and tested positive for influenza A. He rapidly deteriorated developing cardiogenic shock, rhabdomyolysis, and acute kidney injury. Patient improved 1 week later with supportive measures including vasopressors, inotropes, and an intraaortic balloon pump. We report this case as it highlights the discordance between echocardiographic ventricular wall thickening as a result of myocardial edema, and electrocardiographic findings at presentation, with a reversal in findings at time of resolution. Additionally, there was some suggestion of a regional pattern to the reduced longitudinal strain.  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