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   3158274篇
  免费   248225篇
  国内免费   5650篇
耳鼻咽喉   45775篇
儿科学   101523篇
妇产科学   85307篇
基础医学   446368篇
口腔科学   89932篇
临床医学   287103篇
内科学   614901篇
皮肤病学   65735篇
神经病学   260880篇
特种医学   125778篇
外国民族医学   1301篇
外科学   477156篇
综合类   74237篇
现状与发展   2篇
一般理论   1240篇
预防医学   253014篇
眼科学   73805篇
药学   236191篇
  6篇
中国医学   5947篇
肿瘤学   165948篇
  2018年   32555篇
  2017年   24943篇
  2016年   27504篇
  2015年   31064篇
  2014年   44427篇
  2013年   67778篇
  2012年   92007篇
  2011年   97388篇
  2010年   57527篇
  2009年   54984篇
  2008年   92468篇
  2007年   98588篇
  2006年   99230篇
  2005年   96579篇
  2004年   93434篇
  2003年   90425篇
  2002年   88894篇
  2001年   146082篇
  2000年   151288篇
  1999年   128259篇
  1998年   37155篇
  1997年   33680篇
  1996年   33540篇
  1995年   32338篇
  1994年   30316篇
  1993年   28324篇
  1992年   103155篇
  1991年   100266篇
  1990年   96861篇
  1989年   93248篇
  1988年   86384篇
  1987年   85110篇
  1986年   80334篇
  1985年   76844篇
  1984年   58288篇
  1983年   49601篇
  1982年   29846篇
  1981年   26789篇
  1979年   54266篇
  1978年   38007篇
  1977年   32164篇
  1976年   30221篇
  1975年   32133篇
  1974年   39162篇
  1973年   37343篇
  1972年   34808篇
  1971年   32028篇
  1970年   30336篇
  1969年   28061篇
  1968年   25556篇
排序方式: 共有10000条查询结果,搜索用时 14 毫秒
81.
82.
83.
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   
84.
85.
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   
86.
87.
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   
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