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   2286223篇
  免费   169066篇
  国内免费   3721篇
耳鼻咽喉   33563篇
儿科学   77956篇
妇产科学   65379篇
基础医学   329575篇
口腔科学   63479篇
临床医学   198631篇
内科学   448846篇
皮肤病学   49104篇
神经病学   178589篇
特种医学   90353篇
外国民族医学   973篇
外科学   351600篇
综合类   49094篇
现状与发展   1篇
一般理论   632篇
预防医学   171441篇
眼科学   52029篇
药学   172001篇
  3篇
中国医学   4418篇
肿瘤学   121343篇
  2018年   22521篇
  2016年   19010篇
  2015年   21647篇
  2014年   30119篇
  2013年   45981篇
  2012年   63036篇
  2011年   67261篇
  2010年   40023篇
  2009年   37954篇
  2008年   64625篇
  2007年   69693篇
  2006年   70318篇
  2005年   68671篇
  2004年   66703篇
  2003年   64552篇
  2002年   63472篇
  2001年   105883篇
  2000年   109343篇
  1999年   93106篇
  1998年   26234篇
  1997年   23563篇
  1996年   23944篇
  1995年   22691篇
  1994年   21477篇
  1993年   19904篇
  1992年   74555篇
  1991年   73231篇
  1990年   71818篇
  1989年   69057篇
  1988年   64077篇
  1987年   62954篇
  1986年   59344篇
  1985年   56864篇
  1984年   42723篇
  1983年   36427篇
  1982年   21596篇
  1981年   19361篇
  1980年   17769篇
  1979年   39373篇
  1978年   27514篇
  1977年   23657篇
  1976年   22286篇
  1975年   24271篇
  1974年   28510篇
  1973年   27479篇
  1972年   25804篇
  1971年   23755篇
  1970年   22282篇
  1969年   20871篇
  1968年   19384篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
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   
52.
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   
53.
Leocani  L.  Comi  G. 《Neurological sciences》2006,27(1):s27-s29
Neurological Sciences - Brain plasticity, intended as the pattern of functional and structural changes in responses to environmental physiological or pathological events, is underlined by several...  相似文献   
54.
55.
AIM: The intention was to investigate cerebrospinal fluid pressure (CSFP) and volume of cerebrospinal fluid (CSF) drained during and after thoracic- and thoracoabdominal aneurysm repair. The findings were related to the occurrence of postoperative neurologic deficits. METHODS: Twenty-nine patients (12 with thoracic and 17 with thoracoabdominal aortic aneurysm) were operated without shunting or extracorporeal circulation. For monitoring of CSFP an intrathecal catheter was placed in all patients. The volume of CSF withdrawn intraoperatively, on the day of operation as well as on the 1st and 2nd postoperative day was recorded. RESULTS: Twenty-six patients had no postoperative neurologic sequelae. One patient had postoperative paraplegia while 2 had paraparesis. The three patients with neurologic sequelae had higher CSFP intraoperatively than those without neurologic symptoms (P=0.04). Median CSFP during aortic cross-clamping was 19 mmHg and 10 mmHg and the median volumes of CSF drained on the day of operation 210 and 85 mL in the two groups, respectively. There was a significant positive correlation between CSFP and central venous pressure. CONCLUSIONS: A higher intraoperative CSFP was observed in patients with neurologic sequelae following thoracic- and thoracoabdominal aneurysm repair. Further, there was a tendency of higher volumes of CSF drained in this group of patients. Although, the series is too small to allow firm conclusions, it supports the view that CSFP monitoring and drainage is beneficial during thoracic- and thoracoabdominal aneurysm repair.  相似文献   
56.
57.
58.
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   
59.
60.
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