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   994659篇
  免费   72098篇
  国内免费   1523篇
耳鼻咽喉   13430篇
儿科学   26265篇
妇产科学   24275篇
基础医学   141571篇
口腔科学   29635篇
临床医学   87339篇
内科学   196548篇
皮肤病学   20155篇
神经病学   78401篇
特种医学   38811篇
外国民族医学   80篇
外科学   161155篇
综合类   18858篇
现状与发展   1篇
一般理论   303篇
预防医学   67501篇
眼科学   22902篇
药学   76945篇
  4篇
中国医学   2231篇
肿瘤学   61870篇
  2019年   7160篇
  2018年   10480篇
  2017年   8149篇
  2016年   8976篇
  2015年   10287篇
  2014年   14088篇
  2013年   20433篇
  2012年   28782篇
  2011年   29878篇
  2010年   17532篇
  2009年   16691篇
  2008年   29060篇
  2007年   30537篇
  2006年   31265篇
  2005年   29948篇
  2004年   28872篇
  2003年   27554篇
  2002年   27003篇
  2001年   55243篇
  2000年   56908篇
  1999年   47526篇
  1998年   11558篇
  1997年   10161篇
  1996年   10185篇
  1995年   9493篇
  1994年   8737篇
  1993年   8018篇
  1992年   35806篇
  1991年   34194篇
  1990年   32964篇
  1989年   32092篇
  1988年   29221篇
  1987年   28446篇
  1986年   26503篇
  1985年   25376篇
  1984年   18124篇
  1983年   15453篇
  1982年   8169篇
  1979年   15963篇
  1978年   10823篇
  1977年   9238篇
  1976年   7996篇
  1975年   8705篇
  1974年   10556篇
  1973年   9929篇
  1972年   9424篇
  1971年   8906篇
  1970年   8469篇
  1969年   7952篇
  1968年   7224篇
排序方式: 共有10000条查询结果,搜索用时 310 毫秒
31.
32.
33.
34.
35.
The Yakima Valley Farm Workers Clinic (YVFWC) is one of the largest community health centers in the country with clinics throughout south-central Washington and northern Oregon. Its dental program consists of 14 dental clinics providing general and specialty services to the low-income populations it serves. Modeling itself after the YVFWC medical managed care program; the Dental program recently added value-based metrics to its dental practice after Oregon offered a value-based dental reimbursement plan in 2019. This is the first-step YVFWC's dental program that has taken to prepare for value-based reimbursement and transform its dental practice in order to reduce the disease burden in its patient population. The purpose of this article is to describe the processes YVFWC undertook to prepare itself for the new reimbursement model, which included the development of metrics, a metric validation process, a clinical dashboard, and a method for improving metrics. It also outlines its medical/dental integration improvement brought about by embedding hygienists into the medical primary care teams.  相似文献   
36.
37.
38.
39.
Preimplantation genetic diagnosis (PGD) was originally developed to diagnose embryo-related genetic abnormalities for couples who present a high risk of a specific inherited disorder. Because this technology involves embryo selection, the medical, bioethical, and legal implications of the technique have been debated, particularly when it is used to select features that are not related to serious diseases. Although several initiatives have attempted to achieve regulatory harmonization, the diversity of healthcare services available and the presence of cultural differences have hampered attempts to achieve this goal. Thus, in different countries, the provision of PGD and regulatory frameworks reflect the perceptions of scientific groups, legislators, and society regarding this technology. In Brazil, several texts have been analyzed by the National Congress to regulate the use of assisted reproduction technologies. Legislative debates, however, are not conclusive, and limited information has been published on how PGD is specifically regulated. The country requires the development of new regulatory standards to ensure adequate access to this technology and to guarantee its safe practice. This study examined official documents published on PGD regulation in Brazil and demonstrated how little direct oversight of PGD currently exists. It provides relevant information to encourage reflection on a particular regulation model in a Brazilian context, and should serve as part of the basis to enable further reform of the clinical practice of PGD in the country.  相似文献   
40.
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   
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