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   981篇
  免费   45篇
  国内免费   8篇
耳鼻咽喉   12篇
儿科学   21篇
妇产科学   24篇
基础医学   100篇
口腔科学   112篇
临床医学   81篇
内科学   239篇
皮肤病学   26篇
神经病学   38篇
特种医学   108篇
外科学   78篇
综合类   6篇
预防医学   63篇
眼科学   1篇
药学   88篇
中国医学   5篇
肿瘤学   32篇
  2023年   5篇
  2022年   10篇
  2021年   19篇
  2020年   13篇
  2019年   25篇
  2018年   16篇
  2017年   10篇
  2016年   16篇
  2015年   16篇
  2014年   11篇
  2013年   26篇
  2012年   45篇
  2011年   65篇
  2010年   35篇
  2009年   43篇
  2008年   74篇
  2007年   67篇
  2006年   79篇
  2005年   46篇
  2004年   59篇
  2003年   35篇
  2002年   28篇
  2001年   21篇
  2000年   23篇
  1999年   11篇
  1998年   19篇
  1997年   24篇
  1996年   10篇
  1995年   16篇
  1994年   17篇
  1993年   8篇
  1992年   4篇
  1991年   10篇
  1990年   6篇
  1989年   15篇
  1988年   21篇
  1987年   9篇
  1986年   11篇
  1985年   5篇
  1984年   5篇
  1983年   4篇
  1982年   3篇
  1981年   4篇
  1980年   9篇
  1978年   6篇
  1977年   9篇
  1976年   6篇
  1975年   5篇
  1969年   2篇
  1967年   2篇
排序方式: 共有1034条查询结果,搜索用时 15 毫秒
51.
This paper translates the fourteen-year history of the Research Committee of the College of Nursing at Ribeir?o Preto-USP. It shows the tasks, competencies and activities accomplished by their members, emphasizing the Institutional Scientific Initiation Program by the National Council for Scientific and Technological Development and the University of S?o Paulo, the International Scientific Initiation Symposium by the University of S?o Paulo, the research groups and the research grant resource modalities under the Committee's responsibility or monitoring, highlighting its growing importance in the College of Nursing at Ribeir?o Preto-USP.  相似文献   
52.
BACKGROUND: Little non-clinic-based data are available on incident genital warts rates and related healthcare use. GOAL:: The goal of this study was to describe the incidence and predictors of genital warts and associated healthcare utilization patterns among a group of privately insured patients in the United States. STUDY: Health claims were evaluated prospectively from 5,914,107 privately insured individuals. RESULTS: The rate of new genital warts claims per 100,000 person-years at risk, age-standardized to the 2001 U.S. privately insured population, increased from 117.8 in 1998 to 205.0 in 2001. The highest rates were among 20- to 29-year-olds. The majority of claims came from dermatology and obstetrics/gynecology. CONCLUSIONS: The incidence of genital warts, as measured by the rate of new claims, appears to be rising. Age associations with the rate of new genital warts claims differed by gender; these associations may be influenced by changes in health-seeking behavior, potentially driven by health awareness.  相似文献   
53.
54.
This study evaluated the effects of collagen removal on the microleakage of two single-bottle adhesive systems. Forty human third molars were selected and each received two root preparations. The roots were randomly assigned for restoration using Prime & Bond 2.1 (Dentsply Ltda, Petrópolis, RJ 90915, Brazil) or Single Bond (3M Dental Products, St Paul, MN 55144, USA). One root in each tooth was treated with 36% H3PO4 for 15 seconds and the other received an additional treatment with 10% NaOCl for 60 seconds to remove the collagen layer before adhesive was applied. All preparations were restored with Z100 restorative resin (3M Dental Products). The specimens were submitted to 5,000 thermal cycles (5-55 degrees C) and stored in 37 degrees C distilled water for one year. The specimens were then coated with a varnish except for 1 mm of tooth structure surrounding the restoration and immersed in 2% buffered methylene blue for four hours. After rinsing, the restorations were sectioned and two independent observers scored the microleakage at the interface between the restorative material and the tooth using an optical microscope at x45 magnification. The scores were submitted to Fisher's Exact Test and the results showed that collagen removal significantly reduced microleakage for Prime & Bond 2.1 and had no effect on microleakage for Single Bond.  相似文献   
55.
Based on categories related to structure, content, language, and illustrations, the present study provides an evaluation of the quality of educational materials on leishmaniasis available to health services in Brazil. The 18 publications evaluated consisted of four handbooks, four guided studies, four booklets, and six leaflets. Of the total publications assessed, nine were produced by the Brazilian National Health Foundation (FUNASA), five by State and Municipal Health Departments jointly with FUNASA, and one by the Pan-American Health Organization. The evaluations were also performed by three professionals: a physician specialized in leishmaniasis, a parasitologist, and an information/communications expert. The publications failed to specify key items such as target public, objective, and bibliography. The illustrations, especially in the booklets and leaflets, failed to clarify the text, portrayed biased concepts, and omitted credits and scale. According to this study, informative materials on leishmaniasis distributed in Brazil present major limitations which jeopardize the quality of information they contain.  相似文献   
56.
A male patient with palpitations and syncope during an episode of atrial fibrillation was evaluated. After DC cardioversion, the ECG showed a pattern of pre-excitation compatible with right posteroseptal bypass tract. The patient was submitted to RF. During energy application a slow junctional rhythm without AV block was noted. Twenty-four hours after the procedure AV block was observed. The AV conduction was resumed spontaneously 48 hours later with unremarkable outcome up to 1 year. We postulated that the edema caused by RF application damaged the compact AV node, causing transient AV block. The AV node lesion has been manifested by a fast junctional rhythm, but in this case we observed that even a slow junctional rhythm could do it.  相似文献   
57.
The term leptospirosis describes a group of diseases caused by members of the order Spirochaetales, mainly the species Leptospira interrogans. Infection can be asymptomatic but disease of differing severity and clinical features (often suggestive of menin  相似文献   
58.
Twenty-one children who had been diagnosed as having laryngomalacia by direct laryngoscopy in infancy were reviewed 7 to 12 years later. The natural history of the disease is documented. A wide variation in the time of onset and duration of the stridor was found and there was a high incidence of feeding difficulties. A previously reported association with mental retardation or cerebral palsy is not confirmed. 4 out of the 21 children had early speech problems.  相似文献   
59.
In an infant with Menkes's steely-hair syndrome, early treatment (from 21 days of age) with parenteral copper failed to halt the disease. In addition to urinary tract abnormalities, panlobular emphysema was present a finding not previously noted in the syndrome.  相似文献   
60.
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