全文获取类型
收费全文 | 1294篇 |
免费 | 184篇 |
国内免费 | 18篇 |
专业分类
耳鼻咽喉 | 20篇 |
儿科学 | 51篇 |
妇产科学 | 20篇 |
基础医学 | 86篇 |
口腔科学 | 38篇 |
临床医学 | 219篇 |
内科学 | 294篇 |
皮肤病学 | 105篇 |
神经病学 | 39篇 |
特种医学 | 133篇 |
外科学 | 185篇 |
综合类 | 96篇 |
现状与发展 | 30篇 |
预防医学 | 52篇 |
眼科学 | 15篇 |
药学 | 34篇 |
中国医学 | 3篇 |
肿瘤学 | 76篇 |
出版年
2024年 | 18篇 |
2023年 | 179篇 |
2022年 | 12篇 |
2021年 | 16篇 |
2020年 | 55篇 |
2019年 | 21篇 |
2018年 | 51篇 |
2017年 | 45篇 |
2016年 | 39篇 |
2015年 | 57篇 |
2014年 | 82篇 |
2013年 | 62篇 |
2012年 | 27篇 |
2011年 | 31篇 |
2010年 | 74篇 |
2009年 | 88篇 |
2008年 | 28篇 |
2007年 | 53篇 |
2006年 | 19篇 |
2005年 | 20篇 |
2004年 | 11篇 |
2003年 | 17篇 |
2002年 | 19篇 |
2001年 | 12篇 |
2000年 | 16篇 |
1999年 | 28篇 |
1998年 | 37篇 |
1997年 | 49篇 |
1996年 | 40篇 |
1995年 | 35篇 |
1994年 | 31篇 |
1993年 | 34篇 |
1992年 | 10篇 |
1991年 | 9篇 |
1990年 | 9篇 |
1989年 | 26篇 |
1988年 | 24篇 |
1987年 | 17篇 |
1986年 | 5篇 |
1985年 | 13篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 8篇 |
1981年 | 10篇 |
1980年 | 12篇 |
1978年 | 5篇 |
1977年 | 3篇 |
1976年 | 14篇 |
1975年 | 10篇 |
1974年 | 3篇 |
排序方式: 共有1496条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
Magnetic resonance imaging of restrictive cardiomyopathy 总被引:1,自引:0,他引:1
U Sechtem C B Higgins B A Sommerhoff M J Lipton E C Huycke 《The American journal of cardiology》1987,59(5):480-482
65.
66.
67.
CHENGGANG YI MD YONG PAN MD YAN ZHEN MM LINXI ZHANG MD XUDONG ZHANG MD MAOGUO SHU MD YAN HAN MD SHUZHONG GUO MD 《Dermatologic surgery》2006,32(12):1437-1443
BACKGROUND: A recent discovery showed that endothelial progenitor cells (EPCs) could augment collateral vessel growth to ischemic tissues. OBJECTIVE: The objective was to demonstrate the effects of EPCs on the vasculogenesis and survival of free transplanted fat tissues in nude mice. METHODS: EPCs from human donors were cultured in vitro for 7 days. Human fat tissues were injected subcutaneously into the scalps of 20 6-week-old nude male mice. EPCs stained with CM-DiI were mixed with the transplanted fat tissues and injected into the mice. EBM-2 medium was used as control group. The animals were euthanized 15 weeks after the procedure. Graft volume were measured, and histologic evaluation was performed. The central part of fat tissues was histologically evaluated 15 weeks after the fat injection. RESULTS: The survival volume of the experimental group was significantly greater than that of the control group (p< .05). Less cyst formation and fibrosis was obtained in the experimental group. Histologic evaluation of the central part of fat tissues 15 weeks after the fat injection showed that capillary densities increased markedly in the experimental group mice. CONCLUSION: The results indicate that EPCs have the ability to enhance the survival and the quality of the transplanted fat tissues. 相似文献
68.
Breast feeding and dietary habits were studied prospectively in a cohort of children under the age of five years in a rural Somali community. The median duration of breast feeding was 19.5 months. However, all the children also received cow's milk by cup from the first day of life and onwards. Energy supplements (mainly sugar and oil) as well as additional water were given daily from early infancy. Staples, protein-rich foods (beans and meat), vegetables and fruits were usually introduced when the children reached the age of 12-18 months. There was a seasonal variation with the lowest intake of protein-rich and vitamin-rich foods during the rains in May to June. Thus, there was a complete absence of exclusive breast feeding. Energy-reinforced cow's milk and human milk dominated the diet up to the age of one year. Staples were mixed with oil and supplemented with milk, thereby leading to a much higher energy density in the complementary food than is usually the case in African communities. 相似文献
69.
70.
Huycke MM 《The Journal of the Oklahoma State Medical Association》2002,95(11):725-728
Smallpox is a recently extinct human viral infection for which herd immunity has rapidly waned. The threat of smallpox during a bioterrorist event using caches of virus outside reference repositories would lead to epidemics of great and predictable mortality. The result would be short-term societal chaos. Control of smallpox requires vaccination and quarantine, the same measures that eliminated this disease in the 1970's. Extensive coordination and planning would be needed among the healthcare infrastructure, law enforcement agencies and political leadership for effective responses to this public health threat. Despite this challenge, we must remind ourselves that smallpox transmission and vaccinia effectiveness are well understood. Strategies that successfully eradicated smallpox 25 years ago, if appropriately implemented again, would undoubtedly lead to its elimination once again. 相似文献