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   4426篇
  免费   445篇
  国内免费   196篇
耳鼻咽喉   45篇
儿科学   75篇
妇产科学   27篇
基础医学   663篇
口腔科学   38篇
临床医学   578篇
内科学   1018篇
皮肤病学   80篇
神经病学   341篇
特种医学   121篇
外国民族医学   1篇
外科学   456篇
综合类   338篇
现状与发展   1篇
一般理论   9篇
预防医学   347篇
眼科学   107篇
药学   306篇
中国医学   132篇
肿瘤学   384篇
  2024年   7篇
  2023年   85篇
  2022年   175篇
  2021年   188篇
  2020年   145篇
  2019年   155篇
  2018年   140篇
  2017年   107篇
  2016年   121篇
  2015年   174篇
  2014年   193篇
  2013年   187篇
  2012年   290篇
  2011年   322篇
  2010年   196篇
  2009年   194篇
  2008年   276篇
  2007年   244篇
  2006年   269篇
  2005年   226篇
  2004年   150篇
  2003年   155篇
  2002年   133篇
  2001年   103篇
  2000年   97篇
  1999年   99篇
  1998年   74篇
  1997年   43篇
  1996年   45篇
  1995年   38篇
  1994年   23篇
  1993年   18篇
  1992年   51篇
  1991年   25篇
  1990年   32篇
  1989年   29篇
  1988年   20篇
  1987年   27篇
  1986年   19篇
  1985年   23篇
  1984年   10篇
  1983年   15篇
  1978年   8篇
  1977年   6篇
  1976年   7篇
  1975年   6篇
  1974年   6篇
  1969年   8篇
  1938年   6篇
  1935年   8篇
排序方式: 共有5067条查询结果,搜索用时 15 毫秒
1.
2.
PurposeTwitter is an increasingly popular social media platform within the health care community. The objective of this analysis is to characterize the profile of radiation oncology–related tweets and Twitter users over the past 6 years.Methods and MaterialsUsing the web-based social media analytics platform Symplur Signals, we filtered tweets containing at least 1 of the following hashtags or key words: #radonc, #radiationoncology, "rad onc," or "radiation oncology." We evaluated radiation oncology–related Twitter activity between October 2014 and March 2020 for tweet frequency, tweet content, and individuals or groups posting tweets. We identified the most influential Twitter users contributing to radiation oncology–related tweets.ResultsFrom 2014 to 2020, the quarterly volume of radiation oncology–related tweets increased from 5027 to 29,763. Physicians contributed the largest growth in tweet volume. Academic radiation oncologists comprise 60% of the most influential Twitter accounts responsible for radiation oncology–related content. The number of radiation-oncology resident physicians on Twitter increased from 25 to 328 over the past 6 years, and 20% of radiation-oncology residency programs have a Twitter account. Seventy-one percent of radiation oncology–related tweets generated direct communication via mentions, and 59% of tweets contain links to external sources, including scientific articles.ConclusionsThe number of physicians contributing radiation oncology–related Twitter content has increased significantly in recent years. Academic radiation oncologists are the primary influencers of radiation oncology–related Twitter activity. Twitter is used by radiation oncologists to both professionally network and discuss findings related to the field. There remains the opportunity for radiation oncologists to broaden their audience on Twitter to encompass a more diverse community, including patients.  相似文献   
3.
A 68 year-old woman presented with a two-week history of amaurosis fugax, ipsilateral fronto-temporal headache and jaw claudication suggesting carotid giant cell arteritis. However, this syndrome proved to be due to atherosclerosis causing complete occlusion of the external carotid artery at its origin and narrowing of the internal carotid artery. Combined external and internal carotid endarterectomy relieved the symptoms. The symptom complex of temporal arteritis may be rarely mimicked by carotid atherosclerotic occlusive disease.  相似文献   
4.
5.
Nocturnal Sleep‐Related Eating Disorder (NSRED) is a well‐documented sleeping disorder where the person is reported to experience bizarre eating behavior during sleep. Although various causes are implicated in this disorder, role of drugs cannot be ruled out. Here we narrate an interesting rare case report of a drug‐induced new onset NSRED, where a 45‐year‐old man on zolipdem performed an unexpected and bizarre eating behavior during somnambulistic state, type of which has not been reported earlier in the literature. The case falls under even rarer category as such behavior in sleep is reported mainly in woman. © 2008 by Wiley Periodicals, Inc. Int J Eat Disord 2009  相似文献   
6.
152例老年高血压病的诊治体会   总被引:1,自引:0,他引:1  
目的:观察中西医结合治疗老年高血压的疗效。方法:将152例老年高血压患者随机分成两组,对照组76例采用西药治疗,治疗组76例除用西药治疗外辅助中药治疗。结果:治疗组显效30例,有效44例,总有效率97.4%;对照组显效24例,有效40例,总有效率为84.2%。结论:中西医结合治疗老年高血压有较好的疗效。  相似文献   
7.
Summary A simple technique of stereotactic craniotomy and intraoperative lesion localisation that uses the Brown-Robert-Wells (BRW) stereotactic frame is presented. The method optimises craniotomy placement and facilitates localisation of small intracerebral lesions. Using the system, 16 patients have had resection of intracranial neoplasms from deep and/or eloquent areas of the brain with no neurological morbidity.  相似文献   
8.
9.
10.
Human C-reactive protein (CRP), the classic acute phase plasma protein, increases in concentration after myocardial infarction and stroke. Human CRP binds to ligands exposed in damaged tissue and can then activate complement and its proinflammatory functions. In contrast, rat CRP, which binds to similar ligands, does not activate complement. In the present study, systemic complement depletion with cobra venom factor in adult rats subjected to middle cerebral artery occlusion did not affect cerebral infarct size, indicating that circulating complement does not contribute to injury in this model. However, we have previously reported that administration of human CRP to rats undergoing coronary artery ligation caused a marked increase in size of the resulting myocardial infarction, associated with codeposition of human CRP and rat complement in the infarcts. In the present study, we show that adult rats subjected to middle cerebral artery occlusion and then treated with human CRP similarly developed significantly larger cerebral infarcts compared with control subjects receiving human serum albumin. Human CRP can thus contribute to ischemic tissue damage in the brain as well as in the heart, and inhibition of CRP binding may therefore be a promising target for tissue protective acute therapeutic intervention in stroke as well as in myocardial infarction.  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