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   535822篇
  免费   34630篇
  国内免费   695篇
耳鼻咽喉   7181篇
儿科学   17410篇
妇产科学   14153篇
基础医学   88508篇
口腔科学   14783篇
临床医学   46391篇
内科学   97724篇
皮肤病学   12707篇
神经病学   38374篇
特种医学   19597篇
外国民族医学   71篇
外科学   80133篇
综合类   8637篇
一般理论   129篇
预防医学   40416篇
眼科学   12647篇
药学   42038篇
中国医学   1060篇
肿瘤学   29188篇
  2018年   5298篇
  2016年   4481篇
  2015年   4923篇
  2014年   6572篇
  2013年   10158篇
  2012年   13875篇
  2011年   15318篇
  2010年   8862篇
  2009年   8312篇
  2008年   14546篇
  2007年   15631篇
  2006年   15876篇
  2005年   15276篇
  2004年   14896篇
  2003年   14190篇
  2002年   14055篇
  2001年   24808篇
  2000年   25742篇
  1999年   21173篇
  1998年   5685篇
  1997年   4921篇
  1996年   5226篇
  1995年   4806篇
  1994年   4468篇
  1992年   16090篇
  1991年   16659篇
  1990年   16804篇
  1989年   16147篇
  1988年   14901篇
  1987年   14782篇
  1986年   13917篇
  1985年   13297篇
  1984年   9859篇
  1983年   8446篇
  1982年   4700篇
  1981年   4345篇
  1979年   9656篇
  1978年   7048篇
  1977年   5944篇
  1976年   5751篇
  1975年   6556篇
  1974年   7812篇
  1973年   7302篇
  1972年   7164篇
  1971年   6857篇
  1970年   6307篇
  1969年   6046篇
  1968年   5687篇
  1967年   5177篇
  1966年   4546篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
2.
3.
4.
5.
6.
Pharmaceutical Chemistry Journal - Three extracts were produced from the above-ground part of the meadowsweet Filipendula ulmaria (L.) Maxim. using water, 40% ethanol, and 70% ethanol. Comparative...  相似文献   
7.
8.
9.
Past research suggests that as many as 50% of onward human immunodeficiency virus (HIV) transmissions occur during acute and recent HIV infection. It is clearly important to develop interventions which focus on this highly infectious stage of HIV infection to prevent further transmission in the risk networks of acutely and recently infected individuals. Project Protect tries to find recently and acutely infected individuals and prevents HIV transmission in their risk networks. Participants are recruited by community health outreach workers at community-based HIV testing sites and drug users' community venues, by coupon referrals and through referrals from AIDS clinics. When a network with acute/recent infection is identified, network members are interviewed about their risky behaviors, network information is collected, and blood is drawn for HIV testing. Participants are also educated and given prevention materials (condoms, syringes, educational materials); HIV-infected participants are referred to AIDS clinics and are assisted with access to care. Community alerts about elevated risk of HIV transmission are distributed within the risk networks of recently infected. Overall, 342 people were recruited to the project and screened for acute/recent HIV infection. Only six index cases of recent infection (2.3% of all people screened) were found through primary screening at voluntary counseling and testing (VCT) sites, but six cases of recent infection were found through contact tracing of these recently infected participants (7% of network members who came to the interview). Combining screening at VCT sites and contact tracing the number of recently infected people we located as compared to VCT screening alone. No adverse events were encountered. These first results provide evidence for the theory behind the intervention, i.e., in the risk networks of recently infected people there are other people with recent HIV infection and they can be successfully located without increasing stigma for project participants.  相似文献   
10.
There is an increasing number of effective therapies for fracture prevention in adults at risk of osteoporosis. However, shortcomings in the evidence underpinning our management of osteoporosis still exist. Evidence of antifracture efficacy in the groups of patients who most commonly use calcium and vitamin D supplements is lacking, the safety of calcium supplements is in doubt, and the safety and efficacy of high doses of vitamin D give cause for concern. Alendronate, risedronate, zoledronate and denosumab have been shown to prevent spine, nonspine and hip fractures; in addition, teriparatide and strontium ranelate prevent both spine and nonspine fractures, and raloxifene and ibandronate prevent spine fractures. However, most trials provide little information regarding long‐term efficacy or safety. A particular concern at present is the possibility that oral bisphosphonates might cause atypical femoral fractures. Observational data suggest that the incidence of this type of fracture increases steeply with duration of bisphosphonate use, resulting in concern that the benefit–risk balance may become negative in the long term, particularly in patients in whom the osteoporotic fracture risk is not high. Therefore, reappraisal of ongoing use of bisphosphonates after about 5 years is endorsed by expert consensus, and ‘drug holidays’ should be considered at this time. Further studies are needed to guide clinical practice in this area.  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