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   2922451篇
  免费   201323篇
  国内免费   7866篇
耳鼻咽喉   38940篇
儿科学   96064篇
妇产科学   79738篇
基础医学   421546篇
口腔科学   78135篇
临床医学   266593篇
内科学   572611篇
皮肤病学   69809篇
神经病学   234415篇
特种医学   111907篇
外国民族医学   774篇
外科学   435904篇
综合类   55866篇
现状与发展   6篇
一般理论   1058篇
预防医学   222191篇
眼科学   64956篇
药学   214087篇
  9篇
中国医学   5961篇
肿瘤学   161070篇
  2019年   22867篇
  2018年   32569篇
  2017年   24971篇
  2016年   29006篇
  2015年   32595篇
  2014年   44624篇
  2013年   66762篇
  2012年   89574篇
  2011年   95181篇
  2010年   57226篇
  2009年   54435篇
  2008年   88631篇
  2007年   94504篇
  2006年   95949篇
  2005年   91781篇
  2004年   88438篇
  2003年   85576篇
  2002年   82528篇
  2001年   140087篇
  2000年   143353篇
  1999年   120692篇
  1998年   34413篇
  1997年   30469篇
  1996年   30735篇
  1995年   29702篇
  1994年   27215篇
  1993年   25620篇
  1992年   93485篇
  1991年   91116篇
  1990年   88470篇
  1989年   85670篇
  1988年   78469篇
  1987年   76944篇
  1986年   71972篇
  1985年   68796篇
  1984年   51091篇
  1983年   43192篇
  1982年   25184篇
  1981年   22563篇
  1979年   45161篇
  1978年   31874篇
  1977年   26838篇
  1976年   25379篇
  1975年   27503篇
  1974年   32127篇
  1973年   30536篇
  1972年   28548篇
  1971年   26613篇
  1970年   24586篇
  1969年   23570篇
排序方式: 共有10000条查询结果,搜索用时 13 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.
Endoscopic clips have been used mainly for control of gastrointestinal (GI) bleeding and occasionally for closure of GI perforations. However, closure of spontaneous esophageal perforation (Boerhaave's syndrome) by clipping has not been reported. We described successful non-surgical closure of spontaneous esophageal perforation by endoscopic clipping in a patient with bilateral pyopneumothorax and septicemia.  相似文献   
77.
78.
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   
79.
80.
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   
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