全文获取类型
收费全文 | 1479篇 |
免费 | 80篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 24篇 |
儿科学 | 127篇 |
妇产科学 | 36篇 |
基础医学 | 143篇 |
口腔科学 | 66篇 |
临床医学 | 217篇 |
内科学 | 319篇 |
皮肤病学 | 16篇 |
神经病学 | 35篇 |
特种医学 | 231篇 |
外科学 | 137篇 |
综合类 | 41篇 |
一般理论 | 1篇 |
预防医学 | 82篇 |
眼科学 | 7篇 |
药学 | 40篇 |
1篇 | |
肿瘤学 | 47篇 |
出版年
2020年 | 8篇 |
2019年 | 11篇 |
2018年 | 15篇 |
2017年 | 17篇 |
2016年 | 12篇 |
2015年 | 24篇 |
2014年 | 25篇 |
2013年 | 34篇 |
2012年 | 42篇 |
2011年 | 36篇 |
2010年 | 45篇 |
2009年 | 50篇 |
2008年 | 49篇 |
2007年 | 26篇 |
2006年 | 39篇 |
2005年 | 34篇 |
2004年 | 31篇 |
2003年 | 25篇 |
2002年 | 30篇 |
2001年 | 25篇 |
2000年 | 22篇 |
1999年 | 31篇 |
1998年 | 86篇 |
1997年 | 91篇 |
1996年 | 94篇 |
1995年 | 68篇 |
1994年 | 59篇 |
1993年 | 46篇 |
1992年 | 26篇 |
1991年 | 32篇 |
1990年 | 17篇 |
1989年 | 44篇 |
1988年 | 40篇 |
1987年 | 40篇 |
1986年 | 25篇 |
1985年 | 36篇 |
1984年 | 27篇 |
1983年 | 21篇 |
1982年 | 22篇 |
1981年 | 20篇 |
1980年 | 14篇 |
1979年 | 13篇 |
1978年 | 15篇 |
1977年 | 14篇 |
1976年 | 14篇 |
1975年 | 12篇 |
1973年 | 7篇 |
1970年 | 9篇 |
1969年 | 8篇 |
1968年 | 6篇 |
排序方式: 共有1570条查询结果,搜索用时 31 毫秒
1.
PJ Commerford 《Cardiovascular journal of Africa》2015,26(4):151-Aug;26(4):151
2.
A. Cagnin M. Kassiou S. R. Meikle R. B. Banati 《Acta neurologica Scandinavica》2006,114(S185):107-114
3.
Andrew Meikle Davison 《Forensic science, medicine, and pathology》2009,5(2):90-94
A 62-year-old male with no significant medical history developed thromboembolic complications in the lower limbs shortly after
an assault which involved punching and kicking to the trunk. Laparotomy revealed intra-abdominal injuries and an abdominal
aortic aneurysm. Death from multi-organ failure and sepsis occurred 9 days post-injury. The discussion concentrates on blunt
force trauma to the abdominal aorta, specifically on causation, mechanisms of injury and complications. 相似文献
4.
Much of the connective tissue degradation that takes place in periodontal diseases is mediated by proteolytic enzymes. Previous studies have focused on the action of proteinases released by invading polymorphonuclear neutrophils and macrophages, and bacterial enzymes. In view of recent work establishing that resident connective tissue cells can be induced by cytokines to bring about the destruction of their own matrix, we propose a new hypothesis. In this we envisage that a critical step is the interaction of bacterial antigens with inflammatory cells, resulting in the production of a cytokine, interleukin-1. Our interpretation of in vitro evidence is that the loss of connective tissue attachment and bone matrix resorption in periodontal diseases is mediated by metalloproteinases such as collagenase and stromelysin released by cells of the periodontium. Such proteolytic destruction can be induced by interleukin-1, whose production may not be dependent on a specific microbial flora but may be triggered by a number of organisms. It is now clear that interleukin-1 has multiple actions on both immune and non-immune cells; these include the induction of lymphocyte differentiation and proliferation and the stimulation of bone and cartilage resorption, and prostaglandin and metalloproteinase synthesis by connective tissues. It seems likely that further knowledge about the production and function of this cytokine will have an increasing impact in many diseases that involve resorption, particularly since interleukin-1-like molecules can be produced by cell types other than monocytes/macrophages, including keratinocytes and fibroblasts. 相似文献
5.
Hans Bosma Martin PJ van Boxtel Gertrudis IJM Kempen Jacques ThM van Eijk Jelle Jolles 《BMC public health》2007,7(1):179
Background
The aims of this study were to examine the extent to which higher intellectual abilities protect higher socio-economic groups from functional decline and to examine whether the contribution of intellectual abilities is independent of childhood deprivation and low birth weight and other socio-economic and developmental factors in early life. 相似文献6.
7.
8.
Previous reports in the literature have described correlation of increasing repeat length with severity of the phenotype, in Kennedy syndrome. We describe male siblings with different repeat lengths, with lack of expression of the phenotype in the sibling with the longer repeat length. The phenotype was identical to motor neurone disease. There is variability of expression in Kennedy syndrome and repeat length even in siblings cannot be taken as a conclusive indicator of severity. CAG repeat length cannot be used to predict the natural history of Kennedy disease. The diagnosis of Kennedy syndrome should be considered in male patients presenting with atypical motor neurone disease. 相似文献
9.
P S Withington T R Graham R J Meikle A Allan M T Marrinan C T Lewis 《Journal of medical engineering & technology》1991,15(2):68-71
The development of implantable left ventricular assist devices (LVADs) has almost reached the stage of providing permanent circulatory support in patients who are unsuitable for, or denied, the transplant option. As part of our ongoing haemodynamic evaluation of the Thermo Cardiosystems Inc. (Boston, USA) Mark 14 pneumatic LVAD, pressure-volume loops have been produced from in vitro studies using a modified National Heart Lung and Blood Institute (NHLBI, USA) mock circulatory loop. These studies have demonstrated that during certain phases of the pump cycle non-physiologically high and low pressures are generated within the LVAD. Such abnormal pressures may damage either the bioprosthetic valves in the LVAD or the native heart, and may have adverse effects on cardiovascular control mechanisms. 相似文献
10.