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   3140537篇
  免费   222770篇
  国内免费   8423篇
耳鼻咽喉   43011篇
儿科学   99945篇
妇产科学   85714篇
基础医学   441515篇
口腔科学   88292篇
临床医学   285155篇
内科学   616672篇
皮肤病学   73674篇
神经病学   256043篇
特种医学   120972篇
外国民族医学   800篇
外科学   475989篇
综合类   63180篇
现状与发展   5篇
一般理论   1150篇
预防医学   235877篇
眼科学   71138篇
药学   231745篇
  10篇
中国医学   6553篇
肿瘤学   174290篇
  2019年   24111篇
  2018年   34297篇
  2017年   26422篇
  2016年   30552篇
  2015年   34385篇
  2014年   47234篇
  2013年   70609篇
  2012年   93891篇
  2011年   99207篇
  2010年   59691篇
  2009年   57320篇
  2008年   93351篇
  2007年   98970篇
  2006年   100859篇
  2005年   96778篇
  2004年   93237篇
  2003年   89821篇
  2002年   87066篇
  2001年   155673篇
  2000年   159677篇
  1999年   134707篇
  1998年   37579篇
  1997年   33182篇
  1996年   33414篇
  1995年   32296篇
  1994年   29640篇
  1993年   27741篇
  1992年   104476篇
  1991年   100383篇
  1990年   97386篇
  1989年   94070篇
  1988年   86144篇
  1987年   84443篇
  1986年   79139篇
  1985年   75571篇
  1984年   55916篇
  1983年   47363篇
  1982年   27372篇
  1981年   24349篇
  1979年   49479篇
  1978年   34457篇
  1977年   29477篇
  1976年   26961篇
  1975年   28864篇
  1974年   34300篇
  1973年   32493篇
  1972年   30501篇
  1971年   28406篇
  1970年   26468篇
  1969年   25331篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
81.
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   
82.
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   
83.
84.
85.
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   
86.
87.
88.
89.
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   
90.
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