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   2546576篇
  免费   201117篇
  国内免费   3859篇
耳鼻咽喉   34608篇
儿科学   84209篇
妇产科学   72237篇
基础医学   370267篇
口腔科学   74544篇
临床医学   232243篇
内科学   492448篇
皮肤病学   55181篇
神经病学   206228篇
特种医学   98684篇
外国民族医学   713篇
外科学   374954篇
综合类   59473篇
现状与发展   5篇
一般理论   1060篇
预防医学   205185篇
眼科学   58354篇
药学   190816篇
  8篇
中国医学   4479篇
肿瘤学   135856篇
  2018年   25239篇
  2016年   21644篇
  2015年   25076篇
  2014年   34580篇
  2013年   53111篇
  2012年   71826篇
  2011年   76318篇
  2010年   44730篇
  2009年   42918篇
  2008年   72466篇
  2007年   76971篇
  2006年   77323篇
  2005年   75354篇
  2004年   73534篇
  2003年   70498篇
  2002年   68628篇
  2001年   113926篇
  2000年   117281篇
  1999年   99616篇
  1998年   27919篇
  1997年   25401篇
  1996年   25683篇
  1995年   24734篇
  1994年   23135篇
  1993年   21782篇
  1992年   81565篇
  1991年   79657篇
  1990年   77701篇
  1989年   75259篇
  1988年   69842篇
  1987年   68737篇
  1986年   65624篇
  1985年   63008篇
  1984年   47523篇
  1983年   41415篇
  1982年   24481篇
  1981年   22067篇
  1980年   20793篇
  1979年   45480篇
  1978年   32314篇
  1977年   27228篇
  1976年   25567篇
  1975年   27189篇
  1974年   33146篇
  1973年   32216篇
  1972年   29957篇
  1971年   28111篇
  1970年   26134篇
  1969年   24755篇
  1968年   22724篇
排序方式: 共有10000条查询结果,搜索用时 268 毫秒
91.
92.
93.
94.
95.
96.
A 48-year-old smoker with a history of hyperthyroidism treated 10 years prior to presentation with radioactive iodine ablation of the thyroid gland presented to his ophthalmologist with a 2-week history of transient loss of vision in the right eye occurring for 1 to 2 hours each morning. He denied ocular pain, diplopia or change in the prominence of one or both eyes. Examination revealed 2 mm of relative proptosis on the right, bilateral temporal flare and lower lid retraction. There was minimal upper lid retraction and no evidence of lid lag. Ocular motility was full. Dilated fundoscopic examination revealed bilateral optic nerve edema, right more than left. CT of the orbit demonstrated enlargement of the extraocular muscles bilaterally with marked enlargement of the right medial rectus and left inferior rectus muscles resulting in crowding at the orbital apex bilaterally. Laboratory testing revealed the patient to be hyperthyroid. The patient was treated with high dose oral steroids followed by orbital radiation. Hyperthyroidism was managed by the patient’s primary care physician. Visual symptoms rapidly improved with oral steroids and orbital radiation. Optic nerve edema completely resolved. Repeat CT imaging demonstrated a reduction in the enlargement of the extraocular muscles with relief of bilateral optic nerve compression.  相似文献   
97.
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   
98.
99.
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