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   2291628篇
  免费   175036篇
  国内免费   3347篇
耳鼻咽喉   32120篇
儿科学   77676篇
妇产科学   63473篇
基础医学   333683篇
口腔科学   63160篇
临床医学   208420篇
内科学   450191篇
皮肤病学   49739篇
神经病学   182187篇
特种医学   88294篇
外国民族医学   898篇
外科学   337779篇
综合类   49115篇
现状与发展   4篇
一般理论   890篇
预防医学   183374篇
眼科学   51807篇
药学   169619篇
  8篇
中国医学   4102篇
肿瘤学   123472篇
  2018年   23975篇
  2017年   18179篇
  2016年   19937篇
  2015年   22848篇
  2014年   31587篇
  2013年   48477篇
  2012年   66364篇
  2011年   70738篇
  2010年   41563篇
  2009年   39860篇
  2008年   67114篇
  2007年   71934篇
  2006年   71785篇
  2005年   70172篇
  2004年   68062篇
  2003年   65525篇
  2002年   64025篇
  2001年   104978篇
  2000年   108152篇
  1999年   91819篇
  1998年   25792篇
  1997年   23262篇
  1996年   23898篇
  1995年   22592篇
  1994年   21258篇
  1993年   19790篇
  1992年   73277篇
  1991年   71897篇
  1990年   69827篇
  1989年   67235篇
  1988年   62163篇
  1987年   61196篇
  1986年   57653篇
  1985年   55034篇
  1984年   41689篇
  1983年   35610篇
  1982年   20984篇
  1981年   19157篇
  1979年   38356篇
  1978年   27590篇
  1977年   23170篇
  1976年   21683篇
  1975年   23316篇
  1974年   27800篇
  1973年   27206篇
  1972年   25402篇
  1971年   23444篇
  1970年   22039篇
  1969年   20518篇
  1968年   18959篇
排序方式: 共有10000条查询结果,搜索用时 15 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