全文获取类型
收费全文 | 1770篇 |
免费 | 320篇 |
国内免费 | 39篇 |
专业分类
耳鼻咽喉 | 13篇 |
儿科学 | 101篇 |
妇产科学 | 22篇 |
基础医学 | 115篇 |
口腔科学 | 27篇 |
临床医学 | 295篇 |
内科学 | 625篇 |
皮肤病学 | 62篇 |
神经病学 | 175篇 |
特种医学 | 279篇 |
外科学 | 194篇 |
综合类 | 31篇 |
预防医学 | 58篇 |
眼科学 | 18篇 |
药学 | 58篇 |
中国医学 | 1篇 |
肿瘤学 | 55篇 |
出版年
2024年 | 9篇 |
2023年 | 52篇 |
2022年 | 15篇 |
2021年 | 30篇 |
2020年 | 91篇 |
2019年 | 12篇 |
2018年 | 90篇 |
2017年 | 69篇 |
2016年 | 68篇 |
2015年 | 62篇 |
2014年 | 96篇 |
2013年 | 111篇 |
2012年 | 49篇 |
2011年 | 38篇 |
2010年 | 80篇 |
2009年 | 110篇 |
2008年 | 47篇 |
2007年 | 47篇 |
2006年 | 47篇 |
2005年 | 31篇 |
2004年 | 17篇 |
2003年 | 13篇 |
2002年 | 19篇 |
2001年 | 35篇 |
2000年 | 16篇 |
1999年 | 28篇 |
1998年 | 81篇 |
1997年 | 97篇 |
1996年 | 79篇 |
1995年 | 68篇 |
1994年 | 49篇 |
1993年 | 53篇 |
1992年 | 29篇 |
1991年 | 15篇 |
1990年 | 27篇 |
1989年 | 55篇 |
1988年 | 46篇 |
1987年 | 30篇 |
1986年 | 21篇 |
1985年 | 21篇 |
1984年 | 18篇 |
1983年 | 12篇 |
1982年 | 16篇 |
1981年 | 14篇 |
1980年 | 14篇 |
1979年 | 9篇 |
1978年 | 8篇 |
1977年 | 9篇 |
1976年 | 12篇 |
1971年 | 8篇 |
排序方式: 共有2129条查询结果,搜索用时 15 毫秒
61.
62.
63.
Saurabh Kumar Gupta MD DM Anita Saxena MD DM Rajnish Juneja MD DM Gurpreet Singh Gulati MD 《Congenital heart disease》2014,9(4):E125-E128
Atresia of the left main coronary artery is a rare anomaly that, if left untreated, has an unfavorable outcome. We hereby report left main coronary artery atresia in a child with tetralogy of Fallot with absent pulmonary valve and discuss the possible developmental basis of the association. 相似文献
64.
Arinaminpathy N Ratmann O Koelle K Epstein SL Price GE Viboud C Miller MA Grenfell BT 《Proceedings of the National Academy of Sciences of the United States of America》2012,109(8):3173-3177
Large-scale immunization has profoundly impacted control of many infectious diseases such as measles and smallpox because of the ability of vaccination campaigns to maintain long-term herd immunity and, hence, indirect protection of the unvaccinated. In the case of human influenza, such potential benefits of mass vaccination have so far proved elusive. The central difficulty is a considerable viral capacity for immune escape; new pandemic variants, as well as viral escape mutants in seasonal influenza, compromise the buildup of herd immunity from natural infection or deployment of current vaccines. Consequently, most current influenza vaccination programs focus mainly on protection of specific risk groups, rather than mass prophylactic protection. Here, we use epidemiological models to show that emerging vaccine technologies, aimed at broad-spectrum protection, could qualitatively alter this picture. We demonstrate that sustained immunization with such vaccines could--through potentially lowering transmission rates and improving herd immunity--significantly moderate both influenza pandemic and seasonal epidemics. More subtly, phylodynamic models indicate that widespread cross-protective immunization could slow the antigenic evolution of seasonal influenza; these effects have profound implications for a transition to mass vaccination strategies against human influenza, and for the management of antigenically variable viruses in general. 相似文献
65.
66.
67.
68.
69.
70.
Amyotrophic lateral sclerosis (ALS) is the most common motor neuron disease in adults. The biologic basis of ALS remains unknown. However, ALS research has taken a dramatic turn over the past 4 years. Ground breaking discoveries of mutations of genes that encode RNA processing proteins, and demonstration that abnormal aggregates of these and other proteins precede motor neuron loss in familial and sporadic ALS, have initiated a paradigm shift in understanding the pathogenic mechanisms of ALS. Curiously, some of these RNA binding proteins have prion‐like domains, with a propensity to self‐aggregation. The emerging hypothesis that a focal cascade of toxic protein aggregates, and their consequent non–cell‐autonomous spread to neighborhood groups of neurons, fits the classical temporo‐spatial progression of ALS. This article reviews the current research efforts toward understanding the role of RNA‐processing regulation and protein aggregates in ALS. Muscle Nerve 47:330‐338, 2013 相似文献