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   59065篇
  免费   4903篇
  国内免费   2522篇
耳鼻咽喉   529篇
儿科学   1257篇
妇产科学   839篇
基础医学   7878篇
口腔科学   904篇
临床医学   6539篇
内科学   10901篇
皮肤病学   926篇
神经病学   3848篇
特种医学   2148篇
外国民族医学   34篇
外科学   7060篇
综合类   5594篇
现状与发展   5篇
一般理论   3篇
预防医学   4396篇
眼科学   1336篇
药学   5273篇
  29篇
中国医学   2004篇
肿瘤学   4987篇
  2024年   165篇
  2023年   672篇
  2022年   1679篇
  2021年   2286篇
  2020年   1621篇
  2019年   1665篇
  2018年   1889篇
  2017年   1490篇
  2016年   1515篇
  2015年   2027篇
  2014年   2539篇
  2013年   2713篇
  2012年   3860篇
  2011年   4120篇
  2010年   2590篇
  2009年   2108篇
  2008年   2908篇
  2007年   3010篇
  2006年   2849篇
  2005年   2794篇
  2004年   2134篇
  2003年   2176篇
  2002年   1884篇
  2001年   1684篇
  2000年   1733篇
  1999年   1716篇
  1998年   801篇
  1997年   759篇
  1996年   584篇
  1995年   513篇
  1994年   514篇
  1993年   343篇
  1992年   730篇
  1991年   678篇
  1990年   624篇
  1989年   582篇
  1988年   578篇
  1987年   484篇
  1986年   447篇
  1985年   447篇
  1984年   283篇
  1983年   204篇
  1982年   132篇
  1981年   114篇
  1979年   229篇
  1978年   111篇
  1977年   124篇
  1976年   113篇
  1974年   131篇
  1972年   128篇
排序方式: 共有10000条查询结果,搜索用时 24 毫秒
51.
检测了18例精神分裂症患者和25例健康人的SCE频率,结果提示患者组SCE频率显著高于对照组,与年龄、性别、病程、临床类型、有无遗传家族史无明显相关。研究提示SCE频率增高似与疾病本身有关。  相似文献   
52.
53.
Nosocomial infections are a preoccupation in a pediatric hospital mainly during the winter with bronchiolitis and gastroenteritis epidemics. We have examined the risk factors of nosocomial infections. MATERIAL AND METHODS: A prospective study was conducted between November, 1999 and March, 2000 in the infants units of the Le Havre hospital. We systematically listed the admissions and contacted the family after their discharge by phone. A geographic information system was implemented to display the epidemiological data; this software is able to illustrate the sectors at risk. RESULTS: During the study, 687 infants were hospitalized of whom 458 for bronchiolitis and community-acquired gastroenteritis. Mean age was 5.4 months old. No nosocomial bronchiolitis occurred. Prevalence of nosocomial gastroenteritis was 10% (68 cases including nine after discharge). Infants with nosocomial infection were younger than those with community-acquired infection (6.6 months vs. 11.2 months, P < 0.01). The mean length of stay was longer in nosocomial infection (7.7 vs. 4.1 days, P < 0.05). Among the infants with bronchiolitis, 16% have developed nosocomial intestinal infections (RR = 2.65, IC: 1.59-4.4; P < 0.01). The geographic analysis pointed the area with nosocomial risk (bedroom without water, nearness of nurse office and games room). CONCLUSION: Geographic information system is a part of the quality control system and may have some interaction effect on final decision making. Incidence of nosocomial infections showed the need for a prevention strategy in a pediatric hospital.  相似文献   
54.
Treatment of hyperactive child is multimodal, a combination of behaviour therapy and medication. Stimulant drugs are the most often prescribed medications. In France, we use methylphenidate (Ritaline); its efficacy was demonstrated with mild side effects. New formulations of methylphenidate with prolonged action, and non-psychostimulant treatment (atomoxetine) are available in some countries, but not yet in France.  相似文献   
55.
56.
目的 探讨西藏地区农、牧民生活习俗与包囊虫病的关系。方法 自制问卷对 7个县 2 40个家庭 163 1名成员与包囊虫感染有关的生活习俗进行调查分析。结果 饭前便后洗手的人仅有 16 1%,餐具一般都用天然水洗 ,大部家庭用天然绵羊绒擦洗茶具。大多数人都喝过河溪水 ,池塘水 ,人人都吃半生不熟的肉 ,半数以上的吃生肉和生血肠 ,绝大多数人喝未经消毒的鲜牛、羊奶。 10 0 %家庭养狗 ,所有人员与狗、羊、牛、马接触密切。包囊虫病人占调查人数 0 43 %( 7/ 163 1) ,有典型症状者占 0 67%( 11/ 163 1)。结论 当地居民感染包囊虫与不良生活习俗有关  相似文献   
57.
58.
BACKGROUND: In 1992 France set up a national cystic fibrosis observatory (Observatoire national de la mucoviscidose, ONM) to monitor the state of health of patients on an annual basis. Using the ONM data, this study estimates the main indicators for life expectancy and assesses the total number of cystic fibrosis patients. METHODS: The data for the years 1994 to 2003 are divided into 3-year periods. Life tables are drawn up for these periods, from which mean and median lengths of life are determined. Using the most recent life table, the number of births in 2003 and the incidence of the disease, the total population of patients can be estimated, assuming a stationary population. RESULTS: In 2001-2003, life expectancy at birth of patients registered with the ONM was 39.1 years and median length of life was 36.4 years. These results, substantially better than those of 1994-1996, are linked to improved conditions of patient inclusion in the ONM database, to improvements in their healthcare, but also to the limitations of the life tables. Based on the 2003 data, the total theoretical number of patients is 6490, and coverage by the ONM database is thus 63.2%. CONCLUSIONS: These provisional results demonstrate the need to convert the ONM observatory into a registry providing exhaustive coverage of all patients.  相似文献   
59.
Although benign, hepatic haemangioendotheliomas (HHE) are rare vascular tumours of the infant which have a high mortality rate secondary to high output congestive heart failure. The management of these tumours is still controversial and none of the different medical or surgical options has been unanimously accepted. We report the case of a neonate with congestive heart failure (CHF) due to a localized HHE, treated successfully by selective ligation of the left hepatic artery branch irrigating the tumour, under perioperative ultrasound Doppler control. A review of the literature showed 35 cases of HHE treated by hepatic artery ligation (HAL) with a survival rate of 80 %.  相似文献   
60.
The cyclic vomiting syndrome is defined by episodes of vomiting lasting from hours to days with free intervals between episodes. Various symptoms can be associated with vomiting: nausea, abdominal pain, photophobia, fever, pallor, dehydratation, excess salivation, social withdrawal. Some factors often precipitate the crisis: infection, psychological stresses, menstruation. Excluding a medical condition, especially a gastro-intestinal or a neurological disease is compulsory for the diagnostic of cyclic vomiting syndrome. The cyclic vomiting syndrome shares many common features with migraine including treatment. Due to negative paraclinical testing, a psychiatric disease is often suspected in these children. Pathophysiology of cyclic vomiting syndrome is unknown. As for migraine, mitochondrial and ionic channels abnormalities are thought to play a role. Overactivation of hypothalamic-pituitary-adrenal axis and autonomic dysfunction seem to be involved too. Three clinical vignets will illustrate these aspects.  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