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   999079篇
  免费   75364篇
  国内免费   2633篇
耳鼻咽喉   12976篇
儿科学   34537篇
妇产科学   28521篇
基础医学   145512篇
口腔科学   27735篇
临床医学   90465篇
内科学   193926篇
皮肤病学   22942篇
神经病学   79228篇
特种医学   38438篇
外国民族医学   305篇
外科学   149664篇
综合类   23773篇
一般理论   385篇
预防医学   77973篇
眼科学   22620篇
药学   71992篇
  3篇
中国医学   2046篇
肿瘤学   54035篇
  2018年   10616篇
  2017年   8280篇
  2016年   9423篇
  2015年   10644篇
  2014年   14497篇
  2013年   22098篇
  2012年   29100篇
  2011年   30927篇
  2010年   18564篇
  2009年   17492篇
  2008年   28872篇
  2007年   30536篇
  2006年   31055篇
  2005年   29732篇
  2004年   28998篇
  2003年   27857篇
  2002年   26865篇
  2001年   46961篇
  2000年   48065篇
  1999年   40296篇
  1998年   11188篇
  1997年   10104篇
  1996年   10176篇
  1995年   9785篇
  1994年   9095篇
  1993年   8486篇
  1992年   32276篇
  1991年   31487篇
  1990年   31021篇
  1989年   29889篇
  1988年   27179篇
  1987年   27340篇
  1986年   25442篇
  1985年   24617篇
  1984年   18407篇
  1983年   15522篇
  1982年   9292篇
  1981年   8376篇
  1979年   16865篇
  1978年   12221篇
  1977年   10321篇
  1976年   9760篇
  1975年   10182篇
  1974年   12327篇
  1973年   11851篇
  1972年   10885篇
  1971年   10119篇
  1970年   9381篇
  1969年   8725篇
  1968年   8110篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
To evaluate the long-term effects of entacapone on both mean daily 'on' time and health-related quality of life (QoL) in patients with Parkinson's disease (PD) experiencing 'end-of-dose' motor fluctuations and the benefits of an early therapeutic intervention. A prospective, multicenter, observational, 12-month study was performed with an initial 3-month intervention phase, consisting of a phone call to half of the patients from randomly selected investigators to assess if dose adjustment was necessary. Effectiveness was determined by home diaries ('on' time), subscales II and III of the Unified Parkinson's Disease Rating Scale (UPDRS), and the Parkinson's Disease Questionnaire (PDQ-8). After 3 months of treatment, 4.0% of the intervention group patients discontinued the study, versus 18.4% in the control group ( P  < 0.01). The improvement in 'on' time was significantly increased since the 3-month visit (21%, P  < 0.0001) until the end of the study (23% at 12 months, P  < 0.0001). Entacapone also induced significant reductions in the UPDRS scores for subscales II and III and in the PDQ-8 score. 11.2% of patients experienced at least one adverse reaction. This study confirms the effectiveness of entacapone in reducing motor fluctuations by increasing 'on' time, and in improving QoL of PD patients. An early adjustment of entacapone and levodopa doses reduces the number of treatment discontinuations during the first months of treatment.  相似文献   
992.
993.
We describe a case of neonatal osteofibrous dysplasia that was diagnosed 3 days after birth. Osteofibrous dysplasia is a fibro-osseous lesion rarely seen in long bones. It is also known as congenital osteitis fibrosa or ossifying fibroma of bones. Although it occurs in children under 10 years of age, it is extremely rare in newborn babies. It must be differentiated from adamantinoma due to their radiological appearance, predilection for tibia and fibula, clinical picture, and certain histological similarities.  相似文献   
994.
Guidelines for design of clinical trials evaluating behavioral headache treatments were developed to facilitate production of quality research evaluating behavioral therapies for management of primary headache disorders. These guidelines were produced by a Workgroup of headache researchers under auspices of the American Headache Society. The guidelines are complementary to and modeled after guidelines for pharmacological trials published by the International Headache Society, but they address methodologic considerations unique to behavioral and other nonpharmacological treatments. Explicit guidelines for evaluating behavioral headache therapies are needed as the optimal methodology for behavioral (and other nonpharmacologic) trials necessarily differs from the preferred methodology for drug trials. In addition, trials comparing and integrating drug and behavioral therapies present methodological challenges not addressed by guidelines for pharmacologic research. These guidelines address patient selection, trial design for behavioral treatments and for comparisons across multiple treatment modalities (eg, behavioral vs pharmacologic), evaluation of results, and research ethics. Although developed specifically for behavioral therapies, the guidelines may apply to the design of clinical trials evaluating many forms of nonpharmacologic therapies for headache.  相似文献   
995.
996.
997.
998.
999.
Streptococcus agalactiae, known as a pathogen that causes meningitis and septicemia in neonates, emerges as an invasive organism in nonpregnant adults. This case report describes the fulminant course of a necrotizing fasciitis (NF) with streptococcal toxic shock-like syndrome (STSS) in a 76-year-old diabetic patient caused by S. agalactiae, serotype V. Chronic diseases and immunodeficiency are considered to be risk factors for the acquisition of group B streptococcal disease. Since early surgical treatment in conjunction with antimicrobial and intensive care therapy is critical for the outcome of patients with NF and/or STSS, clinicians should be aware of invasive S. agalactiae infections in adults with subcutaneous emphysema.  相似文献   
1000.
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