全文获取类型
收费全文 | 353732篇 |
免费 | 25933篇 |
国内免费 | 2835篇 |
专业分类
耳鼻咽喉 | 7692篇 |
儿科学 | 10772篇 |
妇产科学 | 6704篇 |
基础医学 | 30277篇 |
口腔科学 | 8599篇 |
临床医学 | 37593篇 |
内科学 | 90171篇 |
皮肤病学 | 12300篇 |
神经病学 | 30191篇 |
特种医学 | 10917篇 |
外国民族医学 | 1篇 |
外科学 | 63587篇 |
综合类 | 1161篇 |
现状与发展 | 72篇 |
一般理论 | 37篇 |
预防医学 | 28568篇 |
眼科学 | 8255篇 |
药学 | 15264篇 |
9篇 | |
中国医学 | 766篇 |
肿瘤学 | 19564篇 |
出版年
2024年 | 1228篇 |
2023年 | 6041篇 |
2022年 | 2532篇 |
2021年 | 6600篇 |
2020年 | 7826篇 |
2019年 | 5776篇 |
2018年 | 13023篇 |
2017年 | 10744篇 |
2016年 | 11874篇 |
2015年 | 12336篇 |
2014年 | 20106篇 |
2013年 | 22472篇 |
2012年 | 17603篇 |
2011年 | 18329篇 |
2010年 | 16767篇 |
2009年 | 18991篇 |
2008年 | 16245篇 |
2007年 | 15194篇 |
2006年 | 17127篇 |
2005年 | 14041篇 |
2004年 | 12447篇 |
2003年 | 10823篇 |
2002年 | 10378篇 |
2001年 | 8781篇 |
2000年 | 8523篇 |
1999年 | 7509篇 |
1998年 | 4586篇 |
1997年 | 4085篇 |
1996年 | 3966篇 |
1995年 | 3755篇 |
1994年 | 2388篇 |
1993年 | 1924篇 |
1992年 | 3670篇 |
1991年 | 3462篇 |
1990年 | 3069篇 |
1989年 | 2882篇 |
1988年 | 2650篇 |
1987年 | 2383篇 |
1986年 | 2458篇 |
1985年 | 2202篇 |
1984年 | 1626篇 |
1983年 | 1459篇 |
1979年 | 1542篇 |
1977年 | 1217篇 |
1975年 | 1173篇 |
1974年 | 1359篇 |
1973年 | 1411篇 |
1972年 | 1426篇 |
1971年 | 1286篇 |
1970年 | 1269篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Background
Wearing a pollution mask is an effective, practical, and economic way to prevent the inhalation of dangerous particulate matter (PM). However, it is not uncommon to observe negligence in adopting such behaviour, and this especially among young segments of the population. Using the Theory of Planned Behaviour (TPB) as conceptual framework, this study explores the role of socio-cognitive factors that affect the decision of wearing a pollution mask in the context of young educated people. This is done by selecting a sample of college students in urban China, a country that has seen air quality as one of the major challenges in the last decades. While young urban college students might be expected to be receptive to standard attempts to be influenced through reason-based cognitive stimuli, it is often found that this is not the case. The empirical analysis was articulated it in two steps. Structural Equation Modelling (SEM) was first used to examine the relationships among the conceptual constructs derived from the TPB conceptual model, and second Step-Wise Ordinary Least Squares Regressions (SWOLS) were employed to observe the partial effect played by each item on the decision to wear a mask.Results
Results show that, while reason-based stimuli play a role, attitude, social norm, and self-efficacy were the most important predictors of the behavioural intention (p?<?0.01). The role of past behaviour was also acknowledged as strongly associated with the dependent variable (p?<?0.01). Overall, the likelihood of wearing a pollution mask increases with the importance of others socio-cognitive and psychological factors, which could help understand behavioural biases, and explain the relative role of several mechanisms behind the decision to wear a mask.Conclusions
While tackling pollution requires multiple and synergic approaches, encouraging self-prevention using pollution mask is a simple and effective action, implementable at negligible costs. Resistance among younger, well-educated cohorts to wear masks can be overcome by stressing the social desirability of action and the sense of empowerment derived from its usage. This study has the potential to inform policies aimed at changing suboptimal behavioural attitudes by identifying triggers for change, and it could serve in improving the tailoring of health promotion messages aimed at nudging healthy behaviour.22.
Infrequent isolation of extensively drug-resistant (XDR) Klebsiella pneumoniae resistant to colistin in Spain 总被引:1,自引:0,他引:1
23.
24.
25.
Juan R. Ordoñana Juan F. Sánchez Romera Lucía Colodro-Conde Eduvigis Carrillo Francisca González-Javier Juan J. Madrid-Valero José J. Morosoli-García Francisco Pérez-Riquelme José M. Martínez-Selva 《Gaceta sanitaria / S.E.S.P.A.S》2018,32(1):92-95
Genetically informative designs and, in particular, twin studies, are the most widely used methodology to analyse the relative contribution of genetic and environmental factors to inter-individual variability. These studies basically compare the degree of phenotypical similarity between monozygotic and dizygotic twin pairs. In addition to the traditional estimate of heritability, this kind of registry enables a wide variety of analyses which are unique due to the characteristics of the sample. The Murcia Twin Registry is population-based and focused on the analysis of health-related behaviour. The observed prevalence of health problems is comparable to that of other regional and national reference samples, which guarantees its representativeness. Overall, the characteristics of the Registry facilitate developing various types of research as well as genetically informative designs, and collaboration with different initiatives and consortia. 相似文献
26.
Pedro F. Sánchez-López Ignacio Ruiz-Arrondo Heiko Kotter Francisco Pacheco Martínez Manuel Segovia Hernández M. Elisa Gómez Campoy 《Gaceta sanitaria / S.E.S.P.A.S》2018,32(2):181-183
Historically, no black fly (Diptera: Simuliidae) nuisance has been reported in the Murcia Region. Back in September 2016 the Ojós City Council has contacted the Regional Public Health General Directorate for help regarding a local insect nuisance, most probably based on mosquitoes. After sampling with a BG-sentinel 2 trap, collecting adult specimens with an entomological aspirator, and collect larvae and pupae on submerged giant cane stalks at the river, it turned out that Simulium sergenti was the insect species causing the nuisance. This species is not considered particularly anthropophilic; therefore, a low vector risk for human health was considered. However, the high fly density impaired the life quality of the people at the village. A management plan was recommended, treating the river with Bacillus thuringiensis var israelensis. 相似文献
27.
Cristiana Cortes de Oliveira Carolina Ferreira Nicoletti Marcela Augusta de Souza Pinhel Bruno Affonso Parenti de Oliveira Driele Cristina Gomes Quinhoneiro Natália Yumi Noronha Priscila Giacomo Fassini Júlio Sérgio Marchini Wilson Araújo da Silva Júnior Wilson Salgado Júnior Carla Barbosa Nonino 《Clinical nutrition (Edinburgh, Scotland)》2018,37(4):1383-1388
28.
29.