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   9906篇
  免费   839篇
  国内免费   63篇
耳鼻咽喉   136篇
儿科学   321篇
妇产科学   201篇
基础医学   1143篇
口腔科学   158篇
临床医学   1061篇
内科学   2190篇
皮肤病学   169篇
神经病学   620篇
特种医学   753篇
外科学   1360篇
综合类   398篇
一般理论   3篇
预防医学   646篇
眼科学   327篇
药学   466篇
  2篇
中国医学   36篇
肿瘤学   818篇
  2021年   113篇
  2020年   91篇
  2019年   87篇
  2018年   110篇
  2017年   98篇
  2016年   77篇
  2015年   124篇
  2014年   170篇
  2013年   291篇
  2012年   383篇
  2011年   387篇
  2010年   237篇
  2009年   264篇
  2008年   380篇
  2007年   398篇
  2006年   430篇
  2005年   423篇
  2004年   362篇
  2003年   355篇
  2002年   325篇
  2001年   304篇
  2000年   283篇
  1999年   291篇
  1998年   166篇
  1997年   159篇
  1996年   138篇
  1995年   168篇
  1994年   120篇
  1993年   136篇
  1992年   267篇
  1991年   235篇
  1990年   205篇
  1989年   249篇
  1988年   221篇
  1987年   208篇
  1986年   190篇
  1985年   192篇
  1984年   171篇
  1983年   167篇
  1982年   91篇
  1981年   90篇
  1980年   95篇
  1979年   136篇
  1978年   98篇
  1977年   88篇
  1976年   92篇
  1973年   91篇
  1972年   84篇
  1971年   78篇
  1968年   86篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
1.
2.
Erosive pustular dermatosis of the scalp (EPDS) is an uncommon chronic inflammatory response to scalp trauma that usually resolves with cicatricial alopecia. It most commonly affects elderly patients with a history of actinic damage. Herein, we describe a 16‐year‐old girl with acrofacial dysostosis type 1 presenting after surgery with crusting purulent scalp lesions, whose clinical presentation and histopathologic findings were consistent with EPDS. A review of the literature on EPDS in children is also detailed.  相似文献   
3.
4.
5.
6.
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   
7.
Background Beating heart surgery has now become the commonest technique of doing Coronary Artery Bypass Graft Surgery (CABG) in our country. It is being used even in such high risk situations like diffuse coronary disease and Critical Left Main stem Stenosis (LMCS) with good results. The aim of this study is to retrospectively review our results in Off-Pump Coronary Artery Bypass Surgery (OPCAB) in patients with critical left main stem stenosis. Methods This study is a retrospective analysis of the data of patients who underwent primary coronary artery bypass surgery. During the period from April 2003 to September 2005 a total of 64 patients underwent OPCAB procedure for critical LMCS. During the same period 10 patients underwent CABG on Cardio Pulmonary Bypass (CPB). The age range was 36–77yrs. The sex distribution was M: F 53∶10. Ten patients were done as emergency. 2 of them were on Intra Aortic Balloon Pump (IABP) support preoperatively. 10 patients were high risk with a Euro score of ≥5. Results Left Internal Mammary Artery (LIMA) was used in 78% of cases. Average grafts per patient was 2.96. The median ventilation time was 5.91 hrs. New IABP insertion in postoperative period was required in 1 patient. One patient was reexplored for bleeding. There was one perioperative myocardial infarction. 57% of patients did not need any blood transfusion. There was no conversion to CPB. There was no operative mortality. Inotropes were used in ten cases. Conclusions OPCAB is a safe method of revascularization in patients with critical LMCS. Preoperative IABP is useful in patients with cardiogenic shock. However, there is a place for CPB in patients needing additional procedures like Mitral Valve repair (MV repair) or Dor's procedure or when the vessels are very diffusely diseased. Those patients who are unstable despite IABP support may be managed by Beating heart On Pump (BHOP) technique.  相似文献   
8.
9.
To measure prefrontal and subcortical activity during a cognitive task, we examined 19 newly diagnosed schizophrenics and patients with schizophreniform psychosis. Seven healthy volunteers served as controls. The patients were drug naive or had received neuroleptics for a few days only. Cerebral blood flow distribution was depicted by single photon emission computed tomography at rest and during activation with the Wisconsin Card Sorting Test. A significant relative activation deficit in the left inferior-prefrontal region was revealed during the Wisconsin Card Sorting Test in the patient group. Furthermore, the patients had impaired striatal suppression on the left side during the cognitive task. The test performance was significantly impaired in the patients. The inability to reduce striatal activity may be due to a lack of corticostriatal feedback during prefrontal activation.  相似文献   
10.
Long-term care is now the most common cause of catastrophic illness costs for the elderly. Although acute care health insurance represents a mature market, private long-term care insurance is in its infancy and poised for development. This study presents a comparative analysis of simulation data, generated from the Brookings-ICF Long-Term Care Financing Model, for five alternative private long-term care insurance models. The simulation results indicate 1) the potential market for private long-term care insurance is substantial, 2) moderately comprehensive long-term care policies are affordable by a significant minority of the elderly, 3) policies are considerably more affordable to those under age 65, and 4) long-term care insurance has somewhat less potential to pay for nursing home costs for high risk groups than for other elderly.  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