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   2485929篇
  免费   220918篇
  国内免费   5066篇
耳鼻咽喉   36409篇
儿科学   76102篇
妇产科学   65931篇
基础医学   340776篇
口腔科学   72204篇
临床医学   242444篇
内科学   492695篇
皮肤病学   51592篇
神经病学   213714篇
特种医学   99271篇
外国民族医学   886篇
外科学   377481篇
综合类   56623篇
现状与发展   42篇
一般理论   1052篇
预防医学   206832篇
眼科学   57779篇
药学   180720篇
  4篇
中国医学   4407篇
肿瘤学   134949篇
  2019年   19970篇
  2018年   31047篇
  2017年   25778篇
  2016年   27949篇
  2015年   30846篇
  2014年   43416篇
  2013年   62750篇
  2012年   74696篇
  2011年   78068篇
  2010年   49675篇
  2009年   49528篇
  2008年   73881篇
  2007年   77331篇
  2006年   78988篇
  2005年   75655篇
  2004年   72275篇
  2003年   69385篇
  2002年   68367篇
  2001年   114089篇
  2000年   117536篇
  1999年   99837篇
  1998年   29713篇
  1997年   27120篇
  1996年   27053篇
  1995年   25994篇
  1994年   24049篇
  1993年   22316篇
  1992年   80000篇
  1991年   76900篇
  1990年   73992篇
  1989年   71245篇
  1988年   66252篇
  1987年   65092篇
  1986年   61599篇
  1985年   58636篇
  1984年   44430篇
  1983年   37902篇
  1982年   23060篇
  1981年   20494篇
  1979年   41341篇
  1978年   29083篇
  1977年   24447篇
  1976年   22911篇
  1975年   24029篇
  1974年   29692篇
  1973年   28087篇
  1972年   26295篇
  1971年   24185篇
  1970年   22794篇
  1969年   21104篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Although studies have documented underuse of controller medications and overuse of short-acting inhaled ss(2)-agonist among children with persistent asthma in disadvantaged communities, the persistence of oral ss(2)-agonist use in pediatric practice has not been studied since inhaled short-acting ss(2)-agonists became widespread. We describe medications used to treat asthma among children 3 to 5 years of age at 10 Head Start and other subsidized preschool centers in East and Central Harlem, New York City. We interviewed 149 parents/guardians of children who were identified as having probable asthma based on physician's diagnosis, persistent symptoms, hospitalization, and medication use. We classified 86 of the 149 children (58%) as having current persistent asthma. Only 15 of them (17%) were reported to have used controller medications at least 5 days/week in the last 4 weeks-only 2 of whom used inhaled corticosteroids. By contrast, 53 children (62%) used oral ss(2)-agonist in the last 4 weeks, often (72%) in conjunction with nebulized or inhaled short-acting ss(2)-agonist. Use of oral ss(2)-agonist was associated with more severe symptoms. This study documents the continued widespread use of oral ss(2)-agonist for treatment of children in a low-income community with high prevalence of asthma.  相似文献   
72.
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   
73.
74.
75.
76.
77.
78.
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   
79.
80.
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