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   18256篇
  免费   1342篇
  国内免费   73篇
耳鼻咽喉   219篇
儿科学   491篇
妇产科学   390篇
基础医学   2534篇
口腔科学   1599篇
临床医学   1450篇
内科学   3741篇
皮肤病学   468篇
神经病学   1560篇
特种医学   351篇
外科学   1872篇
综合类   114篇
一般理论   12篇
预防医学   1920篇
眼科学   391篇
药学   1344篇
中国医学   145篇
肿瘤学   1070篇
  2024年   21篇
  2023年   221篇
  2022年   467篇
  2021年   859篇
  2020年   568篇
  2019年   747篇
  2018年   856篇
  2017年   557篇
  2016年   625篇
  2015年   730篇
  2014年   946篇
  2013年   1033篇
  2012年   1600篇
  2011年   1607篇
  2010年   819篇
  2009年   736篇
  2008年   1096篇
  2007年   1087篇
  2006年   885篇
  2005年   782篇
  2004年   754篇
  2003年   571篇
  2002年   480篇
  2001年   235篇
  2000年   187篇
  1999年   177篇
  1998年   100篇
  1997年   48篇
  1996年   43篇
  1995年   35篇
  1994年   26篇
  1993年   20篇
  1992年   65篇
  1991年   54篇
  1990年   76篇
  1989年   54篇
  1988年   57篇
  1987年   64篇
  1986年   50篇
  1985年   42篇
  1984年   22篇
  1983年   28篇
  1980年   17篇
  1976年   18篇
  1975年   16篇
  1974年   23篇
  1973年   22篇
  1969年   14篇
  1968年   12篇
  1966年   17篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
1.
Depigmented lesions may occur as postinflammatory sequelae of subacute cutaneous lupus erythematosus (SCLE), leading to great psychosocial impact. A 53‐year‐old male patient presented with post‐SCLE depigmented facial lesions after five years of disease stability. We proposed surgical treatment with melanocyte‐keratinocyte transplantation procedure (MKTP), and after five months the patient achieved 90% repigmentation, without Koebner phenomenon (KP). In theory, KP is a possible complication of MKTP procedure since the preparation of the receptor area involves the use of dermabrasion. In an attempt to avoid it, we suggest to maintain the treatment of the underlying disease and wait for a minimum period of disease stability before the procedure.  相似文献   
2.
3.
4.
5.
6.
7.
Objective:The present study evaluates a training program for fitting different hearing protection devices (HPDs) based on personal attenuation rating (PAR) before, immediately after, and six months after training.Methods:A total of 67 workers from a public university in the city of São Paulo, Brazil, were invited to participate in the measurement of PARs for foam and silicone protectors through the 3M™ E-A-Rfit Validation System. Two evaluations were performed for each protector at each sampling date: one after reading printed material (the package instructions) and another after being trained by an audiologist. The same procedures were repeated after six months. The final sample consisted of 30 individuals. ANOVA was used for statistical analysis.Results:Larger PAR values were observed after training by the audiologist, and smaller values were observed after six months. Then, after re-training, the values increased again. There were no statistically significant differences in PAR among the HPDs tested. Even after the two training sessions, 23 to 27% of the subjects did not obtain adequate PAR values.Conclusion:These findings emphasize the need for continual worker training in the correct fit of earplug HPDs and the importance of longitudinal PAR monitoring. In addition, some workers, despite the training provided, did not adapt to the HPDs used. Therefore, it is essential that other protection methods and/or other HPD types are made available to these individuals.Key words: Hearing, noise-induced hearing loss, occupational health, personal protective equipment, hearing protection devices  相似文献   
8.
Prevention Science - This study aimed to evaluate the effectiveness of the drug and violence resistance educational program (PROERD) on short-term secondary outcomes, such as intentions to use...  相似文献   
9.
10.
This study was designed to characterize a collection of 60 enteropathogenic Escherichia coli (EPEC) isolates from diarrheic feces of patients in the Ribeirão Preto metropolitan area regarding different phenotypic and molecular features. We examined antibiotic resistance profiles, occurrence of virulence factors‐encoding genes, intimin subtypes and the correlation of serotypes among typical (tEPEC) and atypical (aEPEC) EPEC isolates. The results demonstrated that atypical EPEC was more heterogeneous than typical EPEC concerning the characteristics investigated and 45.2% do not belong to classical EPEC serogroups. Intimin subtype β was the most frequent among the EPEC isolates (46.7%), being detected in both tEPEC and aEPEC. The majority of aEPEC isolates presented localized adherence‐like (LAL) pattern to HEp‐2 cells, although aEPEC isolates displaying diffuse adherence (DA) or non‐adherent were also detected. High prevalence of antimicrobial resistance was found for ampicillin, cephalothin, sulfonamide and tetracycline. In general, tEPEC isolates were more resistant to the antimicrobials tested than aEPEC isolates.  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