全文获取类型
收费全文 | 2507篇 |
免费 | 280篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 122篇 |
妇产科学 | 149篇 |
基础医学 | 351篇 |
口腔科学 | 70篇 |
临床医学 | 214篇 |
内科学 | 400篇 |
皮肤病学 | 62篇 |
神经病学 | 192篇 |
特种医学 | 274篇 |
外科学 | 233篇 |
综合类 | 58篇 |
预防医学 | 259篇 |
眼科学 | 69篇 |
药学 | 188篇 |
1篇 | |
肿瘤学 | 160篇 |
出版年
2018年 | 26篇 |
2016年 | 25篇 |
2015年 | 42篇 |
2014年 | 49篇 |
2013年 | 80篇 |
2012年 | 61篇 |
2011年 | 73篇 |
2010年 | 78篇 |
2009年 | 77篇 |
2008年 | 76篇 |
2007年 | 89篇 |
2006年 | 78篇 |
2005年 | 64篇 |
2004年 | 64篇 |
2003年 | 78篇 |
2002年 | 71篇 |
2001年 | 64篇 |
2000年 | 43篇 |
1999年 | 55篇 |
1998年 | 94篇 |
1997年 | 95篇 |
1996年 | 68篇 |
1995年 | 61篇 |
1994年 | 52篇 |
1993年 | 60篇 |
1992年 | 34篇 |
1991年 | 65篇 |
1990年 | 46篇 |
1989年 | 66篇 |
1988年 | 66篇 |
1987年 | 52篇 |
1986年 | 55篇 |
1985年 | 61篇 |
1984年 | 25篇 |
1983年 | 31篇 |
1982年 | 28篇 |
1981年 | 29篇 |
1980年 | 35篇 |
1979年 | 37篇 |
1978年 | 39篇 |
1977年 | 37篇 |
1976年 | 30篇 |
1975年 | 38篇 |
1974年 | 38篇 |
1973年 | 34篇 |
1972年 | 38篇 |
1971年 | 36篇 |
1970年 | 25篇 |
1969年 | 23篇 |
1968年 | 31篇 |
排序方式: 共有2806条查询结果,搜索用时 15 毫秒
1.
2.
3.
Lori Dorfman Lawrence Wallack Katie Woodruff 《Health education & behavior》2005,32(3):320-36; discussion 355-62
Framing battles in public health illustrate the tension in our society between individual freedom and collective responsibility. This article describes how two frames, market justice and social justice, first articulated in a public health context by Dan Beauchamp, influence public dialogue on the health consequences of corporate practices. The authors argue that public health advocates must articulate the social justice values motivating the changes they seek in specific policy battles that will be debated in the context of news coverage. The authors conclude with lessons for health education practitioners who need to frame public health issues in contentious and controversial policy contexts. Specific lessons include the importance of understanding the existing values and beliefs motivating the public health change being sought, the benefits of articulating core messages that correspond to shared values, and the necessity of developing media skills to compete effectively with adversaries in public debate. 相似文献
4.
Cerebrovascular and metabolic perturbations in delayed heavy charged particle radiation injury 总被引:5,自引:0,他引:5
E H Lo K A Frankel R L Delapaz A Poljak K H Woodruff K M Brennan M H Phillips P E Valk G K Steinberg J I Fabrikant 《Brain research》1989,504(1):168-172
Focal heavy charged particle irradiation of the rabbit brain created defined lesions which were observable by nuclear magnetic resonance (NMR) and positron emission tomography (PET) imaging techniques. The lesions appeared approximately 9-11 months after left partial hemibrain irradiation with 30 Gy (230 MeV/u helium ions), and were restricted to the white matter tracts and deep perithalamic and thalamic regions. 82Rubidium PET and Gadolinium DTPA enhanced NMR imaging were used to detect blood-brain barrier perturbations. 18Fluordeoxyglucose PET studies demonstrated widespread decreases in cerebral glucose uptake in the cortex and thalamus of the irradiated hemisphere. NMR and PET imaging results correlated well with histological findings. Rabbits irradiated with 15 Gy did not demonstrate any abnormalities in the brain with sequential NMR scans through 14 months post-irradiation. 相似文献
5.
In 2002/2005, separate energy requirement equations were generated by the Institute of Medicine's (IOM) Dietary Reference Intake process for normal weight and overweight/obese children and adolescents. The current paper questions the theoretical rationale of having two sets of equations (based solely on body-weight classification): when body weight is considered, overweight and obese children and adolescents do not seem to differ from their normal weight counterparts in energy expended for basal metabolism or physical activity tasks. However, energy needs for weight maintenance among overweight/obese girls were consistently higher when predicted using the equations for overweight/obese individuals compared with those developed for normal weight individuals. In contrast, among overweight/obese boys, they were consistently lower . Although the differences are within the variability of the estimates, even theoretical support for a higher energy intake (as occurs in girls) seems unwise because of the potential contribution to a higher body mass in children who are already at risk. It is the opinion of the authors that the IOM revisit the use of two separate equations and generate one set that is appropriate for all children and adolescents. 相似文献
6.
7.
8.
Pyomyositis: characteristics at CT and MR imaging 总被引:9,自引:0,他引:9
9.
AJ Larner MRCP 《International journal of clinical practice》1994,48(5):272-274
SUMMARY A case is reported of pseudohyperphosphataemia in association with a monoclonal gammopathy of undetermined significance. 相似文献
10.