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   2164794篇
  免费   151371篇
  国内免费   2846篇
耳鼻咽喉   29536篇
儿科学   70487篇
妇产科学   59138篇
基础医学   315329篇
口腔科学   60418篇
临床医学   197546篇
内科学   414616篇
皮肤病学   48101篇
神经病学   169221篇
特种医学   82350篇
外国民族医学   461篇
外科学   316307篇
综合类   44639篇
现状与发展   3篇
一般理论   785篇
预防医学   167157篇
眼科学   49362篇
药学   165550篇
  12篇
中国医学   4525篇
肿瘤学   123468篇
  2018年   22648篇
  2017年   17528篇
  2016年   19516篇
  2015年   22194篇
  2014年   30672篇
  2013年   46028篇
  2012年   62786篇
  2011年   66685篇
  2010年   39035篇
  2009年   37200篇
  2008年   62675篇
  2007年   67061篇
  2006年   67315篇
  2005年   65078篇
  2004年   62430篇
  2003年   59997篇
  2002年   58005篇
  2001年   104462篇
  2000年   106897篇
  1999年   89711篇
  1998年   23959篇
  1997年   21483篇
  1996年   21674篇
  1995年   20361篇
  1994年   18857篇
  1993年   17708篇
  1992年   69560篇
  1991年   67614篇
  1990年   66068篇
  1989年   63863篇
  1988年   58473篇
  1987年   57068篇
  1986年   54222篇
  1985年   51072篇
  1984年   38076篇
  1983年   32759篇
  1982年   18795篇
  1981年   16736篇
  1979年   35329篇
  1978年   24978篇
  1977年   21560篇
  1976年   19452篇
  1975年   21438篇
  1974年   25629篇
  1973年   25024篇
  1972年   23834篇
  1971年   22316篇
  1970年   20833篇
  1969年   19877篇
  1968年   18182篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
Summary: A female patient with isovaleric acidaemia had a successful outcome from pregnancy.  相似文献   
53.
54.
Pulmonary hamartomas are usually an incidental finding and range in size from 1 cm to 8 cm in diameter in various series. We report a case of a massive pulmonary hamartoma (size 25.5 × 17.5 × 6.5 cm and weighing 1134 g) in a 61 year old male who presented with a short history of breathlessness. The tumour was arising from the medial border of the right lung and occupying most of the right chest extending in to the anterior mediastinum. The tumour was compressing the right lung and there was no evidence of infiltration into the surrounding structures. It was successfully treated by surgical resection and final histology was pulmonary hamartoma with predominantly adipose and leiomyomatous differentiation.  相似文献   
55.
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   
56.
57.
58.
Here we report how the different types of regional muscle involvement, i.e. bulbar, ocular or generalized, in patients with myasthenia gravis (MG) influence the mental aspects of quality of life. Clinical examination according to Osserman was performed in 48 MG patients (45 women, three men; mean age 54, SD 12 years). Each patient was at the time for clinical evaluation asked to fill out the disease-specific Myasthenia Gravis Questionnaire (MGQ) and the Short-Form 36-item questionnaire for health survey (SF-36) as patient-oriented tools. We related the regional domains (generalized domain, bulbar domain and ocular domain) of the MGQ and the clinical findings, respectively, with mental quality of life as assessed by SF-36. Bulbar and generalized involvement results in impairment of mental aspects of quality of life, whereas ocular involvement does not.  相似文献   
59.
目的:描述胚胎种植前遗传诊断在1例携带Ⅰ型白细胞黏附缺陷病(LAD-1)携带者并完成健康妊娠夫妇中的应用。设计:病例报道。机构:大学医院生殖中心。患者:1例男女双方都是LAD-1携带者的夫妇,女方CD18基因的外显子4携带有G400A置换,男方的外显子5携带有C562T置换。干预:标准体外受精(IVF)后第3天行卵裂期活检和分裂球遗传分析以检测2处突变以及21号染色体标记物。主要观察指标:1个未罹患LAD-1婴儿的出生。结果:得到15个卵母细胞,其中10个受精。8个胚胎适宜胚胎活组织检查。  相似文献   
60.
Using the SF-12 to measure physical and mental functioning, the authors examine the intra-individual changes in health-related quality of life (HRQOL) 6 months post-discharge for depressed older adults. In addition, they examine three sets of predictors that might influence these changes. The sample of depressed older adults was recruited from an inpatient geropsychiatry unit. Although their physical and mental health scores on the SF-12 were lower than comparable norms, the sample showed an average increase in their mental functioning but a decrease in the physical functioning over the 6 months. Negative life-events were significant predictors of people who reported no change in their mental health functioning and decreases in their physical health functioning. Interestingly, those who experienced positive life events were more likely to report declines and younger participants were more likely to report no change in their physical functioning. The findings indicate that the effects of depression on HRQOL can have enduring effects on a sample of previously hospitalized older adults. The significance of life event changes might signify the importance of taking into account non-traditional areas of medical interventions. Further, the findings indicate the usefulness of the SF-12 quantifying HRQOL outcomes.  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