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   2377119篇
  免费   195143篇
  国内免费   4220篇
耳鼻咽喉   34286篇
儿科学   72770篇
妇产科学   62933篇
基础医学   335180篇
口腔科学   67594篇
临床医学   215712篇
内科学   469174篇
皮肤病学   47972篇
神经病学   201000篇
特种医学   96063篇
外国民族医学   886篇
外科学   360754篇
综合类   56226篇
现状与发展   1篇
一般理论   977篇
预防医学   190705篇
眼科学   55496篇
药学   177671篇
  4篇
中国医学   4372篇
肿瘤学   126706篇
  2018年   24240篇
  2016年   20603篇
  2015年   23312篇
  2014年   33586篇
  2013年   50905篇
  2012年   68855篇
  2011年   72411篇
  2010年   42543篇
  2009年   40926篇
  2008年   68860篇
  2007年   73195篇
  2006年   74089篇
  2005年   72146篇
  2004年   69441篇
  2003年   67125篇
  2002年   66381篇
  2001年   112549篇
  2000年   116618篇
  1999年   98425篇
  1998年   27913篇
  1997年   25546篇
  1996年   25471篇
  1995年   24634篇
  1994年   23177篇
  1993年   21571篇
  1992年   79447篇
  1991年   76455篇
  1990年   73628篇
  1989年   70888篇
  1988年   65909篇
  1987年   64861篇
  1986年   61370篇
  1985年   58458篇
  1984年   44250篇
  1983年   37677篇
  1982年   22894篇
  1981年   20339篇
  1980年   19037篇
  1979年   41311篇
  1978年   28993篇
  1977年   24359篇
  1976年   22839篇
  1975年   23975篇
  1974年   29656篇
  1973年   28049篇
  1972年   26239篇
  1971年   24169篇
  1970年   22765篇
  1969年   21091篇
  1968年   19142篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
A 27-year-old man was admitted with high fever and shivers eleven days after returning from vacation in Indonesia. Physical examination, laboratory values, abdominal ultrasound, and chest x-ray were not conclusive. All blood cultures yielded growth of Salmonella enterica serovar Typhi, and typhoid fever was diagnosed. Subsequently, the patient developed septic shock and pulmonary edema.In this case report epidemiological, clinical, and therapeutic aspects of typhoid fever are discussed with special emphasis on criteria for severe typhoid fever, which is treated with additional glucocorticoids.  相似文献   
62.
63.
64.
65.
66.
AIM: Cardiovascular risk factors can be present in children and young adults. We previously found abnormal microvascular function in children who had glucose intolerance and insulin resistance. The aim of the present study was to investigate whether they also have abnormalities in left ventricular mass (LVM) and arterial stiffness. METHODS: We measured heart dimensions and LVM using echocardiography, and arterial stiffness using pulse wave analysis in 23 children with good glucose handling (postfeeding glucose: 3.9 to 5 mmol/L) and 21 with poor glucose handling (7.7 to 11.4 mmol/L). RESULTS: The time to pulse reflection was slightly shorter in the poorer glucose handlers (mean+/-SD: 143+/-10 vs 153+/-20 ms, P=0.04), suggestive of increased arterial stiffness. Also in this group, there were significant relationships between intraventricular septal thickness, blood pressure and body mass index, but not in the normal glucose handlers. CONCLUSIONS: We have found that normal children who are in the lowest quintile of glucose tolerance in comparison with their peers are exhibiting the first signs of arterial stiffening. In addition, we have seen the beginnings of a relationship between blood pressure, body mass index and left ventricular enlargement in this group. While these changes may not yet be clinically significant, their emergence might be further evidence of early predisposition to cardiovascular disease.  相似文献   
67.
68.
69.
70.
BACKGROUND: This study examines trends in the presentation and surgical management of acute diabetic foot problems in a single institution. METHOD: Prospective audit of all diabetic patients who had a primary procedure for critical lower limb ischaemia (CLI) and/or foot sepsis between 1st January 1990 and 31st December 2002. Primary and secondary intervention, mortality and limb salvage rate within 6 weeks of the index procedure were recorded. RESULTS: There were 661 patients (417 men and 244 women of median age 69, range 31-99, years) with 799 affected limbs. CLI alone was present in 625 (78%) limbs, combined CLI and foot sepsis in 53 (7%) and foot sepsis alone in 121 (15%). The primary intervention was minor amputation in 323 (40%) limbs, revascularisation in 288 (36%), major amputation in 185 (23%) and sympathectomy in three limbs. Within 6 weeks, 125 (16%) limbs required secondary intervention, the peri-procedural mortality rate was 38 of 924 (4%), and the limb salvage rates for patients with CLI, combined CLI and sepsis and sepsis alone were 66, 66 and 80%, respectively. There was a significant decline in the proportion of patients presenting with CLI alone and a significant increase in the proportion presenting with combined CLI and sepsis and sepsis alone. In patients with CLI alone, there was a significant increase in the primary major amputation rate and a significant decline in the minor amputation rate with no significant change in the revascularisation rate. CONCLUSION: There has been a progressive decline in the proportion of patients presenting with CLI alone and a greater proportion of patients presenting with an element of foot sepsis. In patients with CLI alone, the primary major amputation rate has increased at the expense of a decline in minor amputation rate.  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