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   957729篇
  免费   59550篇
  国内免费   1073篇
耳鼻咽喉   12618篇
儿科学   31633篇
妇产科学   25015篇
基础医学   157642篇
口腔科学   25275篇
临床医学   83759篇
内科学   176725篇
皮肤病学   22454篇
神经病学   66925篇
特种医学   35191篇
外国民族医学   116篇
外科学   142132篇
综合类   15680篇
现状与发展   2篇
一般理论   219篇
预防医学   71467篇
眼科学   22528篇
药学   74387篇
  1篇
中国医学   2015篇
肿瘤学   52568篇
  2018年   9885篇
  2016年   8250篇
  2015年   9189篇
  2014年   12417篇
  2013年   18907篇
  2012年   26672篇
  2011年   29186篇
  2010年   16990篇
  2009年   15670篇
  2008年   27417篇
  2007年   29778篇
  2006年   29584篇
  2005年   28256篇
  2004年   27592篇
  2003年   26542篇
  2002年   25833篇
  2001年   43313篇
  2000年   44762篇
  1999年   36849篇
  1998年   9963篇
  1997年   8522篇
  1996年   8833篇
  1995年   8208篇
  1994年   7508篇
  1992年   27775篇
  1991年   28980篇
  1990年   29109篇
  1989年   28275篇
  1988年   25974篇
  1987年   25733篇
  1986年   24150篇
  1985年   23123篇
  1984年   17251篇
  1983年   14692篇
  1982年   8032篇
  1981年   7342篇
  1979年   16679篇
  1978年   11999篇
  1977年   9906篇
  1976年   9959篇
  1975年   11678篇
  1974年   13494篇
  1973年   12973篇
  1972年   12204篇
  1971年   11741篇
  1970年   10928篇
  1969年   10361篇
  1968年   9780篇
  1967年   8769篇
  1966年   7826篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
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   
25.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  相似文献   
26.
27.
28.
29.
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   
30.
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