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   2454123篇
  免费   195410篇
  国内免费   4214篇
耳鼻咽喉   34849篇
儿科学   75639篇
妇产科学   64224篇
基础医学   345115篇
口腔科学   68005篇
临床医学   220153篇
内科学   484581篇
皮肤病学   48325篇
神经病学   208584篇
特种医学   99386篇
外国民族医学   886篇
外科学   373746篇
综合类   56887篇
现状与发展   1篇
一般理论   977篇
预防医学   197607篇
眼科学   56313篇
药学   182172篇
  4篇
中国医学   4384篇
肿瘤学   131909篇
  2018年   33392篇
  2017年   26201篇
  2016年   29296篇
  2015年   23648篇
  2014年   33802篇
  2013年   51095篇
  2012年   71262篇
  2011年   80483篇
  2010年   49095篇
  2009年   45541篇
  2008年   77217篇
  2007年   83376篇
  2006年   74207篇
  2005年   73887篇
  2004年   71459篇
  2003年   70076篇
  2002年   68337篇
  2001年   112713篇
  2000年   116941篇
  1999年   98503篇
  1998年   28009篇
  1997年   25732篇
  1996年   25555篇
  1995年   24738篇
  1994年   23315篇
  1993年   21666篇
  1992年   79490篇
  1991年   76506篇
  1990年   73690篇
  1989年   70927篇
  1988年   65942篇
  1987年   64908篇
  1986年   61427篇
  1985年   58473篇
  1984年   44274篇
  1983年   37709篇
  1982年   22951篇
  1981年   20340篇
  1979年   41387篇
  1978年   29039篇
  1977年   24361篇
  1976年   22895篇
  1975年   23967篇
  1974年   29667篇
  1973年   28051篇
  1972年   26226篇
  1971年   24151篇
  1970年   22772篇
  1969年   21112篇
  1968年   19150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