全文获取类型
收费全文 | 516篇 |
免费 | 22篇 |
国内免费 | 21篇 |
专业分类
儿科学 | 22篇 |
妇产科学 | 3篇 |
基础医学 | 40篇 |
口腔科学 | 5篇 |
临床医学 | 43篇 |
内科学 | 145篇 |
皮肤病学 | 8篇 |
神经病学 | 19篇 |
特种医学 | 139篇 |
外科学 | 20篇 |
综合类 | 33篇 |
预防医学 | 21篇 |
眼科学 | 12篇 |
药学 | 29篇 |
中国医学 | 1篇 |
肿瘤学 | 19篇 |
出版年
2023年 | 2篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 5篇 |
2018年 | 6篇 |
2017年 | 6篇 |
2016年 | 2篇 |
2015年 | 4篇 |
2014年 | 6篇 |
2013年 | 11篇 |
2012年 | 9篇 |
2011年 | 9篇 |
2010年 | 14篇 |
2009年 | 22篇 |
2008年 | 14篇 |
2007年 | 16篇 |
2006年 | 19篇 |
2005年 | 20篇 |
2004年 | 8篇 |
2003年 | 13篇 |
2002年 | 11篇 |
2001年 | 10篇 |
2000年 | 8篇 |
1999年 | 14篇 |
1998年 | 27篇 |
1997年 | 40篇 |
1996年 | 29篇 |
1995年 | 22篇 |
1994年 | 23篇 |
1993年 | 19篇 |
1992年 | 6篇 |
1991年 | 18篇 |
1990年 | 5篇 |
1989年 | 24篇 |
1988年 | 15篇 |
1987年 | 16篇 |
1986年 | 11篇 |
1985年 | 12篇 |
1984年 | 7篇 |
1983年 | 10篇 |
1982年 | 9篇 |
1981年 | 11篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有559条查询结果,搜索用时 15 毫秒
81.
82.
The authors describe a magnetic resonance imaging method for examination of the glenoid labrum of the shoulder joint that utilizes a radial fast-imaging sequence. Seven shoulders were examined: a total of five in three healthy asymptomatic volunteers, one in a symptomatic patient not suspected of having a lesion of the glenoid labrum, and one in a patient with recurrent shoulder dislocation and surgical proof of an extensive tear of the labrum. The preliminary results suggest that this technique may advantageously demonstrate pathologic changes in the glenoid labrum and may contribute to the evaluation of the unstable and painful shoulder. 相似文献
83.
84.
85.
86.
Work in progress: [18F] fluorodeoxyglucose and positron emission tomography in the evaluation of radiation necrosis of the brain 总被引:3,自引:0,他引:3
87.
88.
Choyke PL; Frank JA; Girton ME; Inscoe SW; Carvlin MJ; Black JL; Austin HA; Dwyer AJ 《Radiology》1989,170(3):713
89.
The contribution of proton spectroscopic (PS) imaging to magnetic resonance (MR) imaging of the liver was assessed at 0.5 T in 55 patients with known or suspected hepatic malignancy. PS images were compared subjectively with T1- and T2-weighted spin-echo (SE) images for hepatic lesion detection and conspicuity. For hepatic metastases (n = 27), PS images were equal to T1-weighted images in lesion detection in 17 patients but showed fewer lesions in five patients and false-negative results in two. When compared with T2-weighted images, PS images depicted more lesions in six patients, an equal number of lesions in 18, and fewer lesions in two. Hepatomas (n = 8) were detected with each sequence in all patients. Hepatomas were often more conspicuous on PS images than on T2-weighted images; they were of equal conspicuity on PS and T1-weighted images in most cases. Whereas fatty infiltration (n = 16) appeared on PS images as areas of low signal intensity similar to that of paraspinal muscle, it produced no detectable abnormality on either T1- or T2-weighted images. PS imaging is inferior to T1-weighted SE imaging in the detection of hepatic metastases. The major role of PS imaging at intermediate field strength is to differentiate focal fatty infiltration from hepatic metastases. 相似文献
90.
F Piovella M M Ricetti P Almasio A Samaden G Semino E Ascari 《Thrombosis research》1984,33(3):323-332
The effect of ticlopidine at various concentrations (150, 30, 6 microM), has been studied on cultured endothelial cells derived from human umbilical cord vein. Ticlopidine affects the initial attachment of endothelial cells to artificial substrata and has an inhibitory effect on endothelial cell growth rate which correlates to the concentration of the chemical in the culture medium. These effects are related to a marked reduction of intra- and extracellular fibronectin as evidentiated by immunofluorescence. The drug seems to interfere with the formation of fibronectin filaments from intracellular granules. The reduction of fibronectin availability could affect platelet adhesion to subendothelium as well as endothelial cell repair, and subsequently influence the bleeding time. The inhibition of cell proliferation and its possible effect on the thickness of the vessel wall should be considered as additional mechanisms of action for this substance. 相似文献