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   2901419篇
  免费   204065篇
  国内免费   7877篇
耳鼻咽喉   38920篇
儿科学   95861篇
妇产科学   79856篇
基础医学   414522篇
口腔科学   79528篇
临床医学   262694篇
内科学   568462篇
皮肤病学   69983篇
神经病学   234909篇
特种医学   110879篇
外国民族医学   779篇
外科学   433163篇
综合类   56099篇
现状与发展   5篇
一般理论   1057篇
预防医学   221808篇
眼科学   65115篇
药学   213257篇
  8篇
中国医学   5906篇
肿瘤学   160550篇
  2019年   22566篇
  2018年   31987篇
  2017年   24550篇
  2016年   28481篇
  2015年   31970篇
  2014年   43930篇
  2013年   66041篇
  2012年   87575篇
  2011年   92886篇
  2010年   55962篇
  2009年   53590篇
  2008年   86864篇
  2007年   92470篇
  2006年   94231篇
  2005年   90187篇
  2004年   86970篇
  2003年   83785篇
  2002年   81130篇
  2001年   140432篇
  2000年   144129篇
  1999年   121098篇
  1998年   34462篇
  1997年   30507篇
  1996年   30963篇
  1995年   29947篇
  1994年   27501篇
  1993年   25753篇
  1992年   94028篇
  1991年   91032篇
  1990年   88468篇
  1989年   85497篇
  1988年   78237篇
  1987年   76838篇
  1986年   71793篇
  1985年   68638篇
  1984年   51012篇
  1983年   43163篇
  1982年   25372篇
  1981年   22730篇
  1979年   45339篇
  1978年   32058篇
  1977年   27291篇
  1976年   25285篇
  1975年   27267篇
  1974年   32281篇
  1973年   30519篇
  1972年   28793篇
  1971年   26819篇
  1970年   24782篇
  1969年   23769篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.
73.
Neu-Laxova syndrome (NLS) is a rare autosomal recessive syndrome, characterized by severe intrauterine growth retardation (IUGR), microcephaly, abnormal brain development, oedema and ichthyosis. It was first reported in 1971 by Neu et al. (Pediatrics 47: 610-612) and since then no more than 60 cases have been reported. A newborn girl delivered from a 29-year-old healthy mother was admitted to hospital with a thick membrane covering her body and dismorphic appearance. The diagnosis of NLS was made according to characteristic features. The syndrome is known to have a poor prognosis and the baby lived for 9 weeks. This case is one of the longest living cases of NLS and the fourth case reported from Turkey.  相似文献   
74.
The clinical outcome and appropriate management for patients showing 'borderline changes' on allograft biopsy after renal transplantation is still controversial. In an attempt to identify predictive factors of clinical outcome of patients with such lesions, we reviewed the clinical course of 91 patients with borderline changes. Multivariate analysis revealed significant and independent effects of histological stage (i + t < or = or > 2) and time to borderline changes (< or = or > 3 months after transplant) on serum creatinine levels at 1 year from borderline changes episodes (respectively, p = 0.04 and p = 0.02) and only a significant effect of time to borderline changes on serum creatinine levels at 2 years (p = 0.005). Renal function at 1 year and 2 years as 5- and 8-year graft survival were not significantly different in the group of patients treated with antirejection therapy (T group, n = 49) compared with the untreated group (UT group, n = 42). This study strongly suggests that borderline changes with histological score (i + t) > 2 and late episodes of borderline changes should be considered to be of poor prognosis.  相似文献   
75.
76.
77.
Primary chemotherapy administered to breast cancer patientsis the best model to identify baseline features able to predictwhich patients may be most likely to benefit or not from a cytotoxicregimen. In the March issue of Annals of Oncology two papersevaluated the predictive role of immunohistochemical p53 expressionon  相似文献   
78.
79.
PURPOSE: In children with locally advanced or recurrent malignant tumours, prognosis can be improved by regional deep hyperthermia (RHT) in combination with platin-based chemotherapy. However, because of the increasing number of patients that achieve long-time remission with this therapy, it is necessary to evaluate long-term sequelae of thermochemotherapy. During the years 1993-2004 one has observed avascular osteonecrosis (AON) of the femoral head after RHT in seven children with pelvic germ cell tumours or rhabdomyosarcomas. METHODS: Although AON may develop in patients with malignancies treated with chemo- or radiotherapy alone, RHT might nevertheless contribute to the occurrence of AON. In order to determine potential risk factors for AON after RHT, this study analysed the relationship of AON to the patient's age, medical history and treatment parameters such as thermal dose equivalent and power output. RESULTS AND CONCLUSIONS: In the present study AON was associated with young age as well as intensity of hyperthermia indicated by high power levels that exceed 20 W per kg body weight and/or application of eight or more heat sessions as well as additional radiotherapy. Based on this observation, it was assumed that an optimized three dimensional thermal field modelling may be helpful to avoid hazardous temperatures in the femoral heads during RHT treatment and to reduce AON of the femoral heads.  相似文献   
80.
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified.  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