收费全文 | 126622篇 |
免费 | 8900篇 |
国内免费 | 808篇 |
耳鼻咽喉 | 1406篇 |
儿科学 | 3788篇 |
妇产科学 | 3747篇 |
基础医学 | 16298篇 |
口腔科学 | 3193篇 |
临床医学 | 14091篇 |
内科学 | 26556篇 |
皮肤病学 | 2486篇 |
神经病学 | 11428篇 |
特种医学 | 4325篇 |
外国民族医学 | 23篇 |
外科学 | 16454篇 |
综合类 | 1880篇 |
一般理论 | 100篇 |
预防医学 | 9447篇 |
眼科学 | 1922篇 |
药学 | 9667篇 |
4篇 | |
中国医学 | 627篇 |
肿瘤学 | 8888篇 |
2023年 | 893篇 |
2022年 | 1545篇 |
2021年 | 2883篇 |
2020年 | 1966篇 |
2019年 | 2684篇 |
2018年 | 3314篇 |
2017年 | 2569篇 |
2016年 | 2702篇 |
2015年 | 3087篇 |
2014年 | 4069篇 |
2013年 | 5633篇 |
2012年 | 7358篇 |
2011年 | 7734篇 |
2010年 | 4762篇 |
2009年 | 4261篇 |
2008年 | 6473篇 |
2007年 | 6637篇 |
2006年 | 6108篇 |
2005年 | 5885篇 |
2004年 | 5993篇 |
2003年 | 5642篇 |
2002年 | 5538篇 |
2001年 | 4034篇 |
2000年 | 3882篇 |
1999年 | 3244篇 |
1998年 | 1420篇 |
1997年 | 1149篇 |
1996年 | 1049篇 |
1995年 | 957篇 |
1994年 | 818篇 |
1993年 | 787篇 |
1992年 | 1885篇 |
1991年 | 1894篇 |
1990年 | 1605篇 |
1989年 | 1519篇 |
1988年 | 1386篇 |
1987年 | 1243篇 |
1986年 | 1232篇 |
1985年 | 1117篇 |
1984年 | 818篇 |
1983年 | 752篇 |
1982年 | 484篇 |
1981年 | 415篇 |
1979年 | 592篇 |
1978年 | 441篇 |
1975年 | 437篇 |
1974年 | 488篇 |
1973年 | 474篇 |
1972年 | 428篇 |
1971年 | 403篇 |
Background
There are well-established relationships between health and homelessness, and shelters can facilitate the transmission of diseases and contribute to their prevention. Adequate environmental health conditions and hygiene behaviors in homeless shelters are fundamental to the health of their clients, a marginalized population. We report the status of environmental health conditions and hygiene behaviors in homeless shelters and associated health outcomes; interventions to improve these conditions, behaviors, and outcomes; and obstacles to improvement.Methods
PubMed, Web of Science, Scopus, and EBSCOhost were searched for peer-reviewed studies, and additional sources for grey literature. Studies were included if they reported primary data on one or more environmental health condition or hygiene behavior in homeless shelters.Results
Twenty-eight studies were included in the review. Insufficient ventilation systems, unhygienic bedding, and overcrowding were the most documented environmental health and hygiene deficiencies in homeless shelters, and tuberculosis infections and skin diseases were the most documented associated health outcomes among clients. Studies frequently recommended or described implementation of behavioral and administrative controls, ventilation system improvements, and ultraviolet germicidal irradiation fixtures.Discussion
Most studies addressed airborne transmission of tuberculosis and were conducted in high-income countries, revealing an imbalance in the literature. Insufficient resources and the transience of clients are barriers to improving hygiene behaviors and environmental conditions in homeless shelters. Further investment and research into ensuring adequate hygiene and environmental health in this setting can protect and promote the health and well-being of people experiencing homelessness. 相似文献Methods: Prospective cross-sectional study.
Results: Twenty-seven of 106 patients had positive PCR and/or GWC results on aqueous humor (AH) sampling and 15 of 27 (55.6%) were HIV-positive. Patients with non-anterior uveitis (NAU) were more likely to be HIV+ (p = 0.005). More than 1 possible pathogen was identified in 9 of 27 patients of whom 7 were HIV+. The final clinical diagnosis was discordant with AH findings in 9 of 27 cases. A positive EBV PCR result was associated with a discordant diagnosis (p = 0.001). All cases of herpetic anterior uveitis (42.9% HIV+) tested PCR-/GWC+ while all cases of herpetic NAU tested PCR+/GWC- (83.3% HIV+). All rubella virus cases were PCR+/GWC+.
Conclusion: PCR is useful to diagnose herpetic NAU in HIV+ patients while GWC is useful to diagnose herpetic anterior uveitis. 相似文献