全文获取类型
收费全文 | 29674篇 |
免费 | 2074篇 |
国内免费 | 98篇 |
专业分类
耳鼻咽喉 | 331篇 |
儿科学 | 695篇 |
妇产科学 | 620篇 |
基础医学 | 4287篇 |
口腔科学 | 953篇 |
临床医学 | 3462篇 |
内科学 | 5796篇 |
皮肤病学 | 359篇 |
神经病学 | 3240篇 |
特种医学 | 1116篇 |
外国民族医学 | 2篇 |
外科学 | 3532篇 |
综合类 | 357篇 |
一般理论 | 25篇 |
预防医学 | 2304篇 |
眼科学 | 560篇 |
药学 | 2306篇 |
中国医学 | 28篇 |
肿瘤学 | 1873篇 |
出版年
2023年 | 143篇 |
2022年 | 212篇 |
2021年 | 492篇 |
2020年 | 334篇 |
2019年 | 435篇 |
2018年 | 492篇 |
2017年 | 454篇 |
2016年 | 548篇 |
2015年 | 645篇 |
2014年 | 888篇 |
2013年 | 1305篇 |
2012年 | 1996篇 |
2011年 | 2151篇 |
2010年 | 1268篇 |
2009年 | 1121篇 |
2008年 | 1997篇 |
2007年 | 1971篇 |
2006年 | 1912篇 |
2005年 | 2037篇 |
2004年 | 1876篇 |
2003年 | 1811篇 |
2002年 | 1717篇 |
2001年 | 338篇 |
2000年 | 255篇 |
1999年 | 351篇 |
1998年 | 442篇 |
1997年 | 325篇 |
1996年 | 296篇 |
1995年 | 292篇 |
1994年 | 236篇 |
1993年 | 207篇 |
1992年 | 194篇 |
1991年 | 167篇 |
1990年 | 159篇 |
1989年 | 154篇 |
1988年 | 151篇 |
1987年 | 142篇 |
1986年 | 151篇 |
1985年 | 153篇 |
1984年 | 171篇 |
1983年 | 162篇 |
1982年 | 216篇 |
1981年 | 177篇 |
1980年 | 189篇 |
1979年 | 99篇 |
1978年 | 128篇 |
1977年 | 116篇 |
1976年 | 91篇 |
1975年 | 94篇 |
1974年 | 76篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
Roger Searle 《Journal of reproductive immunology》1996,30(2-3):191-193
The British Society for Immunology Spring Meeting, held at the University of Bristol on April 17–19th, 1996, to mark the bicentenary of Edward Jenner's vaccination against smallpox, provided the setting for the recent meeting of the UK Materno-Fetal Immunobiology Group (MFIG). The theme for the MFIG workshop was ‘Cytokines in Reproduction’ and it was attended by over 60 delegates. 相似文献
74.
75.
Amyloid plaque deposition involves the aggregation of normally soluble proteins into insoluble amyloid fibrils (fibrillization) and proceeds through intermediates with distinct morphologies, including spherical aggregates, protofibrils, and mature fibrils. Recently, a novel annular protofibril-like intermediate with unique pore-like properties was produced by alpha-synuclein, A beta-Arctic and amylin, which are proteins associated with Parkinson's disease, Alzheimer's disease, and type-II diabetes. The observation of annular structures coupled with size selective channel-like activity by these proteins suggests that these structures may be responsible for vesicle permeability by ion-channel formation. Using atomic force spectroscopy, we report here that the ABri peptide associated with familial British dementia produces similar annular and ring-like protofibril structures during the following sequence of events: spherical aggregates (0.4-1.5 nm height)-->chain-like protofibrils (1.5-2.3 nm height)-->ring-like protofibrils and annular protofibrils (1.5-2.3 nm height). This suggests that ABri fibrillization occurs in a similar fashion to other amyloidogenic proteins and that the annular protofibrillar structures may represent a common amyloid intermediate. 相似文献
76.
77.
PURPOSE: Research in the field of brain injury rehabilitation has tended to regard return to work as a measure of outcome. Researchers have not paid particular attention to the experiences of people living with a brain injury. The aim of the phenomenological study reported here was to identify and describe what characterizes the meaning of work to those with acquired brain injury. METHODS: Ten participants of working age were interviewed about the meaning of work 1-5 years after being inflicted with a brain injury. Data were analyzed and interpreted using the Empirical Phenomenological Psychological method. RESULTS: The findings revealed a meaning structure consisting of four main characteristics. Work was no longer experienced as the primary event in life and the social dimension had become more important. The perceived competence and work identity were threatened after the injury. A common theme across all interviews was the struggle to return to a state of normality, and working was considered to be evidence of success. CONCLUSION: The findings described the altered meaning of work 1-5 years after brain injury. This knowledge should lead to an increased understanding among occupational therapists engaged in work rehabilitation after brain injury and can serve as a basis for individualized intervention strategies. 相似文献
78.
Roger Watson 《Journal of advanced nursing》2003,42(6):645-646
79.