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   1049481篇
  免费   75317篇
  国内免费   2918篇
耳鼻咽喉   14388篇
儿科学   32584篇
妇产科学   28881篇
基础医学   146295篇
口腔科学   28376篇
临床医学   90241篇
内科学   213550篇
皮肤病学   20920篇
神经病学   84578篇
特种医学   42279篇
外国民族医学   338篇
外科学   165302篇
综合类   21526篇
现状与发展   1篇
一般理论   435篇
预防医学   79120篇
眼科学   23627篇
药学   74850篇
  3篇
中国医学   1982篇
肿瘤学   58440篇
  2021年   8607篇
  2019年   9017篇
  2018年   12221篇
  2017年   9409篇
  2016年   10090篇
  2015年   11642篇
  2014年   16631篇
  2013年   25649篇
  2012年   34991篇
  2011年   37187篇
  2010年   22049篇
  2009年   20879篇
  2008年   34954篇
  2007年   37164篇
  2006年   36851篇
  2005年   36586篇
  2004年   34965篇
  2003年   33536篇
  2002年   32908篇
  2001年   43380篇
  2000年   44401篇
  1999年   38348篇
  1998年   11756篇
  1997年   10547篇
  1996年   10472篇
  1995年   9780篇
  1994年   9221篇
  1993年   8696篇
  1992年   29617篇
  1991年   28401篇
  1990年   27756篇
  1989年   26590篇
  1988年   24744篇
  1987年   24334篇
  1986年   23457篇
  1985年   22375篇
  1984年   17039篇
  1983年   14661篇
  1982年   9335篇
  1979年   15566篇
  1978年   11127篇
  1977年   9396篇
  1976年   8841篇
  1975年   9607篇
  1974年   11425篇
  1973年   10856篇
  1972年   10176篇
  1971年   9463篇
  1970年   9051篇
  1969年   8415篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.

Background

Arterial vascular anomalies in patients undergoing kidney transplantation (KT) are correlated with a higher incidence of early surgical complications, potentially causing graft loss. Arterial reconstruction allows patients to overcome these surgical challenges, thus minimizing the risk of poor outcomes. The aim of the present study is to retrospectively investigate the safety and effectiveness of the multiple arterial reconstruction technique with a Teflon patch in case of an unavailable aortic patch: to do so, surgical complications, graft function, and patient survival were evaluated.

Methods

During the period January 2009 to August 2016, 202 adult deceased-donor KTs were performed at our center. Group A (n = 27; reconstruction of multiple arteries) and Group B (n = 175; control group) were compared.

Results

No differences were observed between the 2 groups in terms of early postoperative course, with no vascular complication observed in Group A. No vascular patch infections were reported, nor longer cold ischemia time rates. Similarly, long-term survival rates were similar between the 2 groups.

Conclusions

The Teflon-patch arterial reconstruction technique appears to be safe and effective, with an acceptable balance of benefits and potential risks of using a prosthetic material. Studies based on larger series are needed to further validate this approach.  相似文献   
73.
74.
75.
Demodex mites are microscopic arachnids found in the normal skin of many mammals. In humans, it is well established that Demodex mite density is higher in patients with the skin condition rosacea, and treatment with acaricidal agents is effective in resolving symptoms. However, pathophysiology of rosacea is complex and multifactorial. In dogs, demodicosis is a significant veterinary issue, particularly the generalized form of the disease which can be fatal if untreated. In each species, clinical and molecular studies have shown that the host’s immunological interactions with Demodex mites are an important, but not fully understood, aspect of how Demodex can live in the skin either as a harmless commensal organism or as a pathogenic agent. This review outlines the role of Demodex mites in humans and dogs, considering morphology, prevalence, symptoms, diagnosis, histology treatment and pathogenesis.  相似文献   
76.
77.
78.
79.
80.
Psoriasis is a chronic, inflammatory, immune‐mediated disease. Approximately 30% of patients have disease onset before age 18 years. Psoriasis in children and adolescents may be difficult to control, with subsequent poor quality of life and psychosocial consequences. We describe the case of a 12‐year‐old boy with severe, refractory, chronic plaque psoriasis for 6 years. Various therapeutic regimens including different topical corticosteroids, topical vitamin D analogs, phototherapy, photochemotherapy, systemic therapy with methotrexate, cyclosporin, and combination therapies showed only partial or transient responses with frequent relapses. Because anti‐interleukin‐12/23 agents have been successfully used in adults with psoriasis, ustekinumab was initiated and our patient showed a rapid, excellent, sustained response. No recurrence or flares have been observed after 33 months of follow‐up. This case illustrates that ustekinumab may be an effective and safe therapeutic option in adolescents with psoriasis.  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