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   2644152篇
  免费   197681篇
  国内免费   5135篇
耳鼻咽喉   36520篇
儿科学   88532篇
妇产科学   72702篇
基础医学   374727篇
口腔科学   74791篇
临床医学   236459篇
内科学   519875篇
皮肤病学   59252篇
神经病学   206300篇
特种医学   102471篇
外国民族医学   868篇
外科学   404111篇
综合类   59569篇
现状与发展   5篇
一般理论   849篇
预防医学   198496篇
眼科学   61764篇
药学   194623篇
  8篇
中国医学   6075篇
肿瘤学   148971篇
  2019年   20075篇
  2018年   29061篇
  2017年   21978篇
  2016年   24181篇
  2015年   27492篇
  2014年   38260篇
  2013年   56917篇
  2012年   78537篇
  2011年   82956篇
  2010年   49457篇
  2009年   46548篇
  2008年   78043篇
  2007年   83174篇
  2006年   83907篇
  2005年   80713篇
  2004年   78461篇
  2003年   75154篇
  2002年   72936篇
  2001年   133963篇
  2000年   137672篇
  1999年   115463篇
  1998年   30899篇
  1997年   27377篇
  1996年   27694篇
  1995年   26495篇
  1994年   24641篇
  1993年   22769篇
  1992年   89363篇
  1991年   86812篇
  1990年   83939篇
  1989年   80466篇
  1988年   73764篇
  1987年   72328篇
  1986年   67779篇
  1985年   64520篇
  1984年   47953篇
  1983年   40588篇
  1982年   23096篇
  1981年   20794篇
  1979年   42514篇
  1978年   29412篇
  1977年   25054篇
  1976年   23298篇
  1975年   24997篇
  1974年   29869篇
  1973年   28516篇
  1972年   26519篇
  1971年   24213篇
  1970年   22701篇
  1969年   20966篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
92.
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   
93.
94.
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   
95.
96.
97.
98.
99.
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   
100.
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