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   2065270篇
  免费   158635篇
  国内免费   4129篇
耳鼻咽喉   29134篇
儿科学   71770篇
妇产科学   58175篇
基础医学   296786篇
口腔科学   56990篇
临床医学   184479篇
内科学   404922篇
皮肤病学   46283篇
神经病学   163031篇
特种医学   81261篇
外国民族医学   941篇
外科学   313940篇
综合类   46901篇
现状与发展   1篇
一般理论   735篇
预防医学   159333篇
眼科学   46842篇
药学   151614篇
  5篇
中国医学   4002篇
肿瘤学   110889篇
  2018年   21381篇
  2017年   16382篇
  2016年   18300篇
  2015年   20729篇
  2014年   28689篇
  2013年   43933篇
  2012年   59124篇
  2011年   62895篇
  2010年   37697篇
  2009年   35700篇
  2008年   59802篇
  2007年   63749篇
  2006年   64369篇
  2005年   62286篇
  2004年   60857篇
  2003年   58714篇
  2002年   57303篇
  2001年   98398篇
  2000年   101486篇
  1999年   85934篇
  1998年   23952篇
  1997年   21555篇
  1996年   21869篇
  1995年   20932篇
  1994年   19662篇
  1993年   18249篇
  1992年   68470篇
  1991年   67087篇
  1990年   65448篇
  1989年   62778篇
  1988年   57580篇
  1987年   57172篇
  1986年   53407篇
  1985年   51438篇
  1984年   38604篇
  1983年   32556篇
  1982年   19196篇
  1981年   17379篇
  1979年   34985篇
  1978年   24815篇
  1977年   21024篇
  1976年   19739篇
  1975年   21123篇
  1974年   25024篇
  1973年   24131篇
  1972年   22210篇
  1971年   20476篇
  1970年   19136篇
  1969年   17520篇
  1968年   16154篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
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   
74.
75.
76.
As millions of people turn to social media for health information, better understanding the factors that guide health-related judgments and perceptions in this context is imperative. We report on two Web experiments (n > 400 total) examining the power of society’s widespread weight bias and related stereotypes to influence nutrition judgments in social media spaces. In Experiment 1, meals were judged as lower in nutritional quality when the person who recommended them (the source) was depicted as obese rather than of normal weight, an effect mediated by stereotypic beliefs about the source as a generally unhealthy person. Experiment 2 replicated this effect, which—notably—remained significant when controlling for objective nutritional information (calories and fat content). Results highlight spillover effects of weight bias that extend beyond person perception to color impressions of objects (here, food) that are associated with stigmatized attributes. Implications for everyday nutrition judgments and public health are considered.  相似文献   
77.
78.
79.
Vaskulitiden     
  相似文献   
80.
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   
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