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   2374761篇
  免费   195047篇
  国内免费   4210篇
耳鼻咽喉   34271篇
儿科学   72753篇
妇产科学   62935篇
基础医学   334887篇
口腔科学   67524篇
临床医学   215529篇
内科学   468602篇
皮肤病学   47931篇
神经病学   200782篇
特种医学   95966篇
外国民族医学   886篇
外科学   360413篇
综合类   56218篇
现状与发展   1篇
一般理论   977篇
预防医学   190602篇
眼科学   55467篇
药学   177531篇
  4篇
中国医学   4366篇
肿瘤学   126373篇
  2018年   24206篇
  2016年   20580篇
  2015年   23285篇
  2014年   33538篇
  2013年   50833篇
  2012年   68743篇
  2011年   72280篇
  2010年   42476篇
  2009年   40870篇
  2008年   68768篇
  2007年   73098篇
  2006年   74001篇
  2005年   72036篇
  2004年   69339篇
  2003年   67016篇
  2002年   66258篇
  2001年   112452篇
  2000年   116526篇
  1999年   98336篇
  1998年   27859篇
  1997年   25524篇
  1996年   25447篇
  1995年   24609篇
  1994年   23161篇
  1993年   21554篇
  1992年   79388篇
  1991年   76397篇
  1990年   73577篇
  1989年   70843篇
  1988年   65850篇
  1987年   64803篇
  1986年   61335篇
  1985年   58401篇
  1984年   44224篇
  1983年   37658篇
  1982年   22887篇
  1981年   20333篇
  1980年   19035篇
  1979年   41302篇
  1978年   28987篇
  1977年   24348篇
  1976年   22832篇
  1975年   23965篇
  1974年   29640篇
  1973年   28043篇
  1972年   26228篇
  1971年   24152篇
  1970年   22752篇
  1969年   21087篇
  1968年   19135篇
排序方式: 共有10000条查询结果,搜索用时 0 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