全文获取类型
收费全文 | 1499篇 |
免费 | 127篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 66篇 |
妇产科学 | 24篇 |
基础医学 | 251篇 |
口腔科学 | 29篇 |
临床医学 | 160篇 |
内科学 | 282篇 |
皮肤病学 | 46篇 |
神经病学 | 197篇 |
特种医学 | 38篇 |
外科学 | 155篇 |
综合类 | 2篇 |
现状与发展 | 1篇 |
一般理论 | 1篇 |
预防医学 | 172篇 |
眼科学 | 19篇 |
药学 | 65篇 |
中国医学 | 2篇 |
肿瘤学 | 107篇 |
出版年
2023年 | 18篇 |
2022年 | 32篇 |
2021年 | 46篇 |
2020年 | 44篇 |
2019年 | 30篇 |
2018年 | 45篇 |
2017年 | 40篇 |
2016年 | 50篇 |
2015年 | 52篇 |
2014年 | 74篇 |
2013年 | 65篇 |
2012年 | 119篇 |
2011年 | 129篇 |
2010年 | 70篇 |
2009年 | 79篇 |
2008年 | 132篇 |
2007年 | 110篇 |
2006年 | 113篇 |
2005年 | 90篇 |
2004年 | 96篇 |
2003年 | 78篇 |
2002年 | 57篇 |
2001年 | 4篇 |
2000年 | 6篇 |
1999年 | 13篇 |
1998年 | 5篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 7篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1987年 | 1篇 |
排序方式: 共有1629条查询结果,搜索用时 0 毫秒
141.
Gemma Nicholls Tom Bailey Corinna F. Grindle Richard P. Hastings 《Journal of Applied Research in Intellectual Disabilities》2023,36(2):366-373
Background
Longitudinal research is needed to strengthen evidence for risk factors for challenging behaviour in children with intellectual disabilities and to understand patterns of change over time.Methods
Data on challenging behaviour were collected for 225 students in one school over four annual time points and a range of potential risk correlates. Data were analysed using Generalised Estimating Equations.Results
Prevalence of challenging behaviour, aggression and self-injury did not vary significantly over time. Stereotyped behaviours increased over the 4-year period. Challenging behaviour was associated with lower levels of adaptive skills and autism. Stereotyped behaviour increased with age. Self-injurious behaviour was less likely to be shown in children with profound intellectual disabilities over time.Conclusions
These findings are consistent with previous research in terms of potential risk factors identified. Implications for schools include proactive interventions for children with intellectual disabilities at high risk; especially those with autism and poorer adaptive skills. 相似文献142.
143.
Ellen E. Fitzsimmons-Craft PhD Agatha A. Laboe BA Claire McGinnis BA Marie-Laure Firebaugh LMSW Jillian Shah BS Michael Wallendorf PhD Corinna Jacobi PhD Anna M. Bardone-Cone PhD Kathleen M. Pike PhD C. Barr Taylor MD Denise E. Wilfley PhD 《The International journal of eating disorders》2023,56(3):654-661
144.
145.
146.
Koch-Gromus Uwe Bergelt Corinna 《Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz》2022,65(4):403-405
Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz - 相似文献
147.
148.
149.
150.
Kehrenberg C Meunier D Targant H Cloeckaert A Schwarz S Madec JY 《The Journal of antimicrobial chemotherapy》2006,58(1):13-17
OBJECTIVES: A florfenicol-resistant Pasteurella trehalosi isolate from a calf was investigated for the presence and the location of the gene floR. METHODS: The P. trehalosi isolate 13698 was investigated for its in vitro susceptibility to antimicrobial agents and its plasmid content. A 14.9 kb plasmid, designated pCCK13698, was identified by transformation into Pasteurella multocida to mediate resistance to florfenicol, chloramphenicol and sulphonamides. The plasmid was sequenced completely and analysed for its structure and organization. RESULTS: Plasmid pCCK13698 exhibited extended similarity to plasmid pHS-Rec from Haemophilus parasuis including the region carrying the parA, repB, rec and int genes. Moreover, it revealed similarities to plasmid RSF1010 in the parts covering the mobC and repA-repC genes and to plasmid pMVSCS1 in the parts covering the sul2-catA3-strA gene cluster. Moreover, the floR gene area corresponded to that of transposon TnfloR. In addition, two complete insertion sequences were detected that were highly similar to IS1593 from Mannheimia haemolytica and IS26 from Enterobacteriaceae. Several potential recombination sites were identified that might explain the development of plasmid pCCK13698 by recombination events. CONCLUSIONS: The results of this study showed that in the bovine pathogen P. trehalosi, floR-mediated resistance to chloramphenicol and florfenicol was associated with a plasmid, which also carried functionally active genes for resistance to sulphonamides (sul2) and chloramphenicol (catA3). This is to the best of our knowledge the first report of resistance genes in P. trehalosi and only the second report of the presence of a florfenicol-resistance gene in target bacteria of the family Pasteurellaceae. 相似文献