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   2101889篇
  免费   162716篇
  国内免费   7312篇
耳鼻咽喉   27799篇
儿科学   62891篇
妇产科学   55768篇
基础医学   291190篇
口腔科学   60705篇
临床医学   187049篇
内科学   424073篇
皮肤病学   47878篇
神经病学   169264篇
特种医学   85043篇
外国民族医学   346篇
外科学   334757篇
综合类   46263篇
现状与发展   3篇
一般理论   627篇
预防医学   157600篇
眼科学   45892篇
药学   154077篇
  8篇
中国医学   4051篇
肿瘤学   116633篇
  2018年   20432篇
  2016年   18846篇
  2015年   21199篇
  2014年   29371篇
  2013年   43773篇
  2012年   55517篇
  2011年   59138篇
  2010年   36324篇
  2009年   35302篇
  2008年   56195篇
  2007年   59656篇
  2006年   61311篇
  2005年   59218篇
  2004年   56713篇
  2003年   55075篇
  2002年   52990篇
  2001年   109075篇
  2000年   112616篇
  1999年   94050篇
  1998年   25601篇
  1997年   22622篇
  1996年   23595篇
  1995年   23159篇
  1994年   21562篇
  1993年   20087篇
  1992年   75489篇
  1991年   73040篇
  1990年   70513篇
  1989年   67834篇
  1988年   62558篇
  1987年   61169篇
  1986年   57517篇
  1985年   55403篇
  1984年   41053篇
  1983年   34730篇
  1982年   20206篇
  1981年   17911篇
  1980年   16792篇
  1979年   36764篇
  1978年   25857篇
  1977年   21971篇
  1976年   19780篇
  1975年   21056篇
  1974年   25012篇
  1973年   23806篇
  1972年   22303篇
  1971年   20764篇
  1970年   19253篇
  1969年   18032篇
  1968年   16639篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
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   
53.
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 The volume of CSF withdrawn intraoperatively, on the day of operation as well as on the 1st and 2nd postoperative day was recorded.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   
54.
55.
56.
57.
58.
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   
59.
60.
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