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   1684186篇
  免费   114830篇
  国内免费   3767篇
耳鼻咽喉   24340篇
儿科学   51075篇
妇产科学   45674篇
基础医学   235439篇
口腔科学   47712篇
临床医学   142997篇
内科学   337545篇
皮肤病学   38298篇
神经病学   138193篇
特种医学   64658篇
外国民族医学   560篇
外科学   254748篇
综合类   33790篇
现状与发展   7篇
一般理论   637篇
预防医学   123657篇
眼科学   38791篇
药学   124536篇
  5篇
中国医学   3853篇
肿瘤学   96268篇
  2019年   13893篇
  2018年   21341篇
  2017年   16116篇
  2016年   17388篇
  2015年   19640篇
  2014年   25823篇
  2013年   39706篇
  2012年   56054篇
  2011年   58550篇
  2010年   33236篇
  2009年   30645篇
  2008年   54741篇
  2007年   59043篇
  2006年   58554篇
  2005年   57537篇
  2004年   55351篇
  2003年   53122篇
  2002年   51582篇
  2001年   70851篇
  2000年   72465篇
  1999年   62031篇
  1998年   17230篇
  1997年   15554篇
  1996年   14762篇
  1995年   13956篇
  1994年   12926篇
  1992年   46603篇
  1991年   44742篇
  1990年   43847篇
  1989年   42624篇
  1988年   39823篇
  1987年   39099篇
  1986年   37463篇
  1985年   35555篇
  1984年   26920篇
  1983年   22932篇
  1982年   14356篇
  1981年   13011篇
  1979年   25495篇
  1978年   18361篇
  1977年   16050篇
  1976年   14410篇
  1975年   16372篇
  1974年   19342篇
  1973年   18803篇
  1972年   17918篇
  1971年   16760篇
  1970年   15898篇
  1969年   15396篇
  1968年   14353篇
排序方式: 共有10000条查询结果,搜索用时 765 毫秒
71.
INTRODUCTIONPsoriasis is a chronic inflammatory condition that affects the skin and joints, and is associated with cardiovascular risk factors, including metabolic syndrome (MetS). We aimed to assess the prevalence of MetS in patients with psoriasis and determine whether there was a correlation between psoriasis severity and MetS in a Singapore population.METHODSThis was a cross-sectional study of patients with psoriasis, aged 18–69 years, who attended a tertiary dermatology referral centre in Singapore from October 2007 to February 2009. Fasting glucose, lipids, blood pressure, Psoriasis Area and Severity Index, and body mass index were measured. MetS was diagnosed in the presence of three or more criteria of the modified National Cholesterol Education Program Adult Treatment Panel III.RESULTSAmong 338 patients with psoriasis, there were 238 (70.4%) men and 100 (29.6%) women, who were Chinese (n = 228; 67.5%), Malay (n = 52; 15.4%) and Indian (n = 58; 17.2%). The prevalence of MetS was 45.1%. MetS was 44% more prevalent in patients older than 50 years (p = 0.02). Malay patients with psoriasis were significantly more likely to have hypertriglyceridaemia, elevated fasting plasma glucose and abdominal obesity. There was no significant correlation between psoriasis severity and risk of MetS.CONCLUSIONThe prevalence of MetS in patients with psoriasis in Singapore was 45.1%, or nearly threefold higher than the Singapore general population. Patients with psoriasis should be screened yearly for MetS and any modifiable cardiovascular risk factors should be actively controlled.  相似文献   
72.
73.

Objective

The “Centre Hospitalier Francois Dunan” is located on an isolated island and ensures patients care in hemodialysis thanks to telemedicine support. Many research studies have demonstrated the importance of hemodialysis fluids composition to reduce morbidity in patients on chronic hemodialysis. The aim of this study was to identify the risks inherent in the production of dialysis fluids in a particular context, in order to set up an improvement action plan to improve risk control on the production of dialysis fluids.

Methods

The risk analysis was conducted with the FMECA methodology (Failure Mode, Effects and Criticality Analysis) by a multi professional work group. Three types of risk have been reviewed: technical risks that may impact the production of hemodialysis fluids, health risks linked with chemical composition and health risks due to microbiological contamination of hemodialysis fluids.

Results

The work group, in close cooperation with the expert staff of the dialysis center providing telemedicine assistance, has developed an action plan in order to improve the control of the main risks brought to light by the risk analysis.

Conclusion

The exhaustive analysis of the risks and their prioritisation have permitted to establish a relevant action plan in this improving quality of dialysis fluids approach. The risk control of dialysis fluids is necessary for the security of dialysis sessions for patients, even more when these sessions are realized by telemedicine in Saint-Pierre-et-Miquelon.  相似文献   
74.
75.
76.
77.
78.
Porocarcinoma is an unusual, locally aggressive and potentially fatal neoplasm. Several cutaneous malignancies have been described in association with porocarcinoma, including squamous cell carcinoma, basal cell carcinoma and tricholemmal carcinoma. Previous reports have indicated that the occurrence of malignant tumours in combination with porocarcinoma is extremely rare, in particular with regard to Bowen disease (BD). We report an uncommon case of porocarcinoma occurring synchronously in a single BD lesion in a 63‐year‐old woman with multiple BD lesions. The clinical and histological findings confirmed this diagnosis.  相似文献   
79.
Children who expect they can bring about good outcomes and avoid bad outcomes tend to experience more personal successes. Little is known about factors that contribute to these ‘control expectancies’. The purpose of the present study was to determine whether children's internal control expectancies occur in the context of parents’ internal control expectancies, low family strain, and high family cohesiveness and whether these factors are more strongly related to daughters’ than sons’ control expectancies. A community sample of 85 children aged 9–11 years and their parents (85 mothers; 63 fathers) completed rating scales. Fathers’ more internal control expectancies and mothers’ reports of fewer family strains were associated with daughters’ but not sons’ greater internal control expectancies, and greater family cohesiveness was related to both daughters’ and sons’ internal control orientations. These findings suggest that family factors may contribute to children's, particularly daughters’, development of internal control expectancies.  相似文献   
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