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   3037591篇
  免费   252659篇
  国内免费   13399篇
耳鼻咽喉   41491篇
儿科学   95719篇
妇产科学   76093篇
基础医学   495998篇
口腔科学   81292篇
临床医学   273239篇
内科学   523778篇
皮肤病学   85084篇
神经病学   258616篇
特种医学   118509篇
外国民族医学   107篇
外科学   473835篇
综合类   94178篇
现状与发展   23篇
一般理论   2113篇
预防医学   256278篇
眼科学   69427篇
药学   205839篇
  23篇
中国医学   9731篇
肿瘤学   142276篇
  2022年   23015篇
  2021年   54781篇
  2020年   34994篇
  2019年   57882篇
  2018年   70332篇
  2017年   53552篇
  2016年   58910篇
  2015年   73472篇
  2014年   107526篇
  2013年   172491篇
  2012年   80481篇
  2011年   78772篇
  2010年   113724篇
  2009年   118724篇
  2008年   66031篇
  2007年   67659篇
  2006年   78939篇
  2005年   74178篇
  2004年   76521篇
  2003年   67513篇
  2002年   57631篇
  2001年   85238篇
  2000年   77189篇
  1999年   80639篇
  1998年   63080篇
  1997年   61303篇
  1996年   59014篇
  1995年   54538篇
  1994年   48712篇
  1993年   45495篇
  1992年   54417篇
  1991年   52238篇
  1990年   49311篇
  1989年   49488篇
  1988年   45729篇
  1987年   44495篇
  1986年   42296篇
  1985年   42842篇
  1984年   41109篇
  1983年   38210篇
  1982年   38933篇
  1981年   36987篇
  1980年   34980篇
  1979年   32878篇
  1978年   30811篇
  1977年   28638篇
  1976年   26297篇
  1975年   24911篇
  1974年   24675篇
  1973年   23536篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
Caring for patients with end-stage kidney disease (ESKD) in the United States is challenging, due in part to the complex epidemiology of the disease's progression as well as the ways in which care is delivered. As CKD progresses toward ESKD, the number of comorbidities increases and care involves multiple healthcare providers from multiple subspecialties. This occurs in the context of a fragmented US healthcare delivery system that is traditionally siloed by provider specialty, organization, as well as systems of payment and administration. This article describes the role of care fragmentation in the delivery of optimal ESKD care and identifies research gaps in the evidence across the continuum of care. We then consider the impact of care fragmentation on ESKD care from the patient and health system perspectives and explore opportunities for system-level interventions aimed at improving care for patients with ESKD.  相似文献   
83.
AimsWe previously showed that the protective effects of endothelial progenitor cells (EPCs)‐released exosomes (EPC‐EXs) on endothelium in diabetes. However, whether EPC‐EXs are protective in diabetic ischemic stroke is unknown. Here, we investigated the effects of EPC‐EXs on diabetic stroke mice and tested whether miR‐126 enriched EPC‐EXs (EPC‐EXsmiR126) have enhanced efficacy.MethodsThe db/db mice subjected to ischemic stroke were intravenously administrated with EPC‐EXs 2 hours after ischemic stroke. The infarct volume, cerebral microvascular density (MVD), cerebral blood flow (CBF), neurological function, angiogenesis and neurogenesis, and levels of cleaved caspase‐3, miR‐126, and VEGFR2 were measured on day 2 and 14.ResultsWe found that (a) injected EPC‐EXs merged with brain endothelial cells, neurons, astrocytes, and microglia in the peri‐infarct area; (b) EPC‐EXsmiR126 were more effective than EPC‐EXs in decreasing infarct size and increasing CBF and MVD, and in promoting angiogenesis and neurogenesis as well as neurological functional recovery; (c) These effects were accompanied with downregulated cleaved caspase‐3 on day 2 and vascular endothelial growth factor receptor 2 (VEGFR2) upregulation till day 14.ConclusionOur results indicate that enrichment of miR126 enhanced the therapeutic efficacy of EPC‐EXs on diabetic ischemic stroke by attenuating acute injury and promoting neurological function recovery.  相似文献   
84.
85.
86.
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   
87.
88.
89.
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   
90.
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