全文获取类型
收费全文 | 2741篇 |
免费 | 185篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 34篇 |
儿科学 | 60篇 |
妇产科学 | 37篇 |
基础医学 | 364篇 |
口腔科学 | 336篇 |
临床医学 | 209篇 |
内科学 | 622篇 |
皮肤病学 | 60篇 |
神经病学 | 126篇 |
特种医学 | 154篇 |
外科学 | 305篇 |
综合类 | 24篇 |
一般理论 | 1篇 |
预防医学 | 331篇 |
眼科学 | 27篇 |
药学 | 152篇 |
中国医学 | 26篇 |
肿瘤学 | 77篇 |
出版年
2023年 | 26篇 |
2022年 | 33篇 |
2021年 | 99篇 |
2020年 | 78篇 |
2019年 | 88篇 |
2018年 | 106篇 |
2017年 | 73篇 |
2016年 | 84篇 |
2015年 | 91篇 |
2014年 | 118篇 |
2013年 | 153篇 |
2012年 | 248篇 |
2011年 | 237篇 |
2010年 | 121篇 |
2009年 | 112篇 |
2008年 | 147篇 |
2007年 | 149篇 |
2006年 | 128篇 |
2005年 | 97篇 |
2004年 | 82篇 |
2003年 | 73篇 |
2002年 | 53篇 |
2001年 | 36篇 |
2000年 | 48篇 |
1999年 | 35篇 |
1998年 | 29篇 |
1997年 | 22篇 |
1996年 | 33篇 |
1995年 | 21篇 |
1994年 | 10篇 |
1993年 | 10篇 |
1992年 | 15篇 |
1991年 | 16篇 |
1990年 | 17篇 |
1989年 | 17篇 |
1988年 | 31篇 |
1987年 | 17篇 |
1986年 | 15篇 |
1985年 | 26篇 |
1984年 | 11篇 |
1983年 | 12篇 |
1982年 | 7篇 |
1981年 | 7篇 |
1979年 | 8篇 |
1977年 | 10篇 |
1976年 | 14篇 |
1974年 | 9篇 |
1972年 | 7篇 |
1971年 | 7篇 |
1965年 | 7篇 |
排序方式: 共有2945条查询结果,搜索用时 844 毫秒
1.
2.
A new range of stand magnifiers has been released by the COIL company in the United Kingdom. Examination of these magnifiers reveals that they fail to deliver the rated magnifications labelled prominently on the appliances, as a result of the manufacturer's conformance with the requirements of the German DIN standard and the use of back vertex power (F'v) rather than equivalent dioptric power (Fm) of the magnifier. In this study we provide information on the optometric parameters of these new stand magnifiers that will assist the more accurate specification of improvements in vision expected from their use. 相似文献
3.
Twenty one patients with idiopathic Parkinsonism beginning before the age of 40 years were investigated. The mean duration of the disease was 19 years. There was a good and sustained response to levodopa. Only four patients reached stages IV and V (Hoehn and Yahr). Intolerance to levodopa was observed in the more advanced stages of the disease. In the series the familial incidence of Parkinsonism (2 cases) and essential tremor (3 cases) was very low. Thyroid disorder, diabetes mellitus or macrocytic anaemia was not found in any of the cases. 相似文献
4.
Milena Soares Santos Guilherme de Sousa Ribeiro Tainara Queiroz Oliveira Renan Cardoso Nery Santos Edilane Gouveia Kátia Salgado Daniele Takahashi Cleuber Fontes Leila Carvalho Campos Mitermayer Galvão Reis Albert Icksang Ko Joice Neves Reis 《International journal of infectious diseases》2009,13(4):456-461
5.
Anna Letícia Soares Marinez de Oliveira Sousa Luci Maria Dusse Ana Paula Salles Moura Fernandes Marcelo Carvalho Lasmar Bethania Alves Novelli Geralda de Fátima Guerra Lages Maria das Gra?as Carvalho 《Blood coagulation & fibrinolysis》2007,18(5):395-399
This study aimed to investigate whether endothelial cells are damaged and to evaluate fibrinolytic system function in patients with type 2 diabetes. For this proposal, plasma levels of von Willebrand factor (an endothelial marker of injury), homocysteine (an inductor of endothelial injury), D-dimer (a marker of coagulation cascade activation) and plasminogen activator inhibitor-1 (a fibrinolysis marker) were measured in individuals with both type 2 diabetes and high blood pressure, with type 2 diabetes, with high blood pressure and in healthy control individuals. No significant differences among groups were observed for von Willebrand factor and homocysteine plasma levels. The type 2 diabetes and high blood pressure group presented a significant difference to the other groups for D-dimer and also presented high values for plasminogen activator inhibitor-1. The high blood pressure group and type 2 diabetes group presented separately higher values of plasminogen activator inhibitor-1 compared with the control group. High levels of D-dimer and plasminogen activator inhibitor-1 in patients with type 2 diabetes and high blood pressure with normoalbuminuria therefore indicate a state of hypercoagulability and hypofibrinolysis, despite no evident microvascular injury supported by normal levels of von Willebrand factor and homocysteine. 相似文献
6.
7.
8.
Pheochromocytoma and paraganglioma: comparison of MR imaging with CT and I-131 MIBG scintigraphy 总被引:6,自引:0,他引:6
To ascertain the magnetic resonance (MR) imaging characteristics of pheochromocytomas and paragangliomas and to compare MR with computed tomography (CT) and iodine-131 metaiodobenzylguanidine (I-131 MIBG), 19 patients (18 with pheochromocytomas, one with a paraganglioma) were studied. The 18 patients with pheochromocytomas had had positive findings with I-131 MIBG scintigraphy. Abdominal pheochromocytomas were generally hypointense compared with normal liver on T1-weighted MR images and extremely hyperintense on T2-weighted MR images. MR imaging was preferable to CT in the evaluation of primary pheochromocytomas due to superior tissue characterization, particularly in the patient with hypertension and borderline catecholamine levels. For patients with recurrent or metastatic disease, the data suggest that I-131 MIBG scintigraphy is the examination of choice. 相似文献
9.
10.