全文获取类型
收费全文 | 704篇 |
免费 | 44篇 |
国内免费 | 34篇 |
专业分类
儿科学 | 46篇 |
妇产科学 | 8篇 |
基础医学 | 87篇 |
口腔科学 | 24篇 |
临床医学 | 103篇 |
内科学 | 166篇 |
皮肤病学 | 16篇 |
神经病学 | 12篇 |
特种医学 | 116篇 |
外科学 | 45篇 |
综合类 | 22篇 |
预防医学 | 37篇 |
眼科学 | 2篇 |
药学 | 75篇 |
肿瘤学 | 23篇 |
出版年
2021年 | 5篇 |
2020年 | 7篇 |
2019年 | 4篇 |
2018年 | 12篇 |
2017年 | 4篇 |
2016年 | 9篇 |
2015年 | 11篇 |
2014年 | 23篇 |
2013年 | 31篇 |
2012年 | 17篇 |
2011年 | 15篇 |
2010年 | 31篇 |
2009年 | 37篇 |
2008年 | 15篇 |
2007年 | 36篇 |
2006年 | 21篇 |
2005年 | 20篇 |
2004年 | 15篇 |
2003年 | 17篇 |
2002年 | 21篇 |
2001年 | 10篇 |
2000年 | 13篇 |
1999年 | 26篇 |
1998年 | 37篇 |
1997年 | 35篇 |
1996年 | 37篇 |
1995年 | 25篇 |
1994年 | 35篇 |
1993年 | 21篇 |
1992年 | 8篇 |
1991年 | 6篇 |
1990年 | 10篇 |
1989年 | 21篇 |
1988年 | 25篇 |
1987年 | 12篇 |
1986年 | 15篇 |
1985年 | 10篇 |
1984年 | 9篇 |
1983年 | 9篇 |
1982年 | 12篇 |
1981年 | 13篇 |
1980年 | 12篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 2篇 |
1976年 | 9篇 |
1975年 | 7篇 |
1973年 | 1篇 |
1969年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有782条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
Potentiation of atherosclerotic lesions in rabbits by a high dietary level of vitamin E 总被引:2,自引:0,他引:2
S L Godfried G F Combs J M Saroka L A Dillingham 《The British journal of nutrition》1989,61(3):607-617
1. Two experiments were conducted to determine whether or not high dietary levels of vitamin E affect the development of atherosclerotic lesions in aortas of cholesterol-fed (5 g/kg diet) rabbits that were mechanically deendothelialized by balloon catheterization. 2. In the first experiment, the aortas of rabbits fed 2000 mg vitamin E/kg diet (i.e. 50-fold their nutritional requirement) for 8 weeks showed no gross morphological differences, either within or outside experimentally damaged areas, from those of rabbits fed the nutritionally adequate control level (40 mg/kg) of the vitamin. 3. In the second experiment, rabbits fed 10,000 mg vitamin E/kg diet (i.e. 250-fold requirement) for 14-15 weeks showed significantly greater endothelial loss and plaque formation at aortic sites outside of the mechanically damaged area than did controls. Plasma cholesterol levels were very high (9000-14,000 mg/l) and were not affected by dietary vitamin E level until 10-12 weeks when they were reduced moderately (18%). 4. It is concluded that very high levels of vitamin E can potentiate spontaneous atherosclerotic lesions, and it is suggested that this effect may depend on high cholesterol status. 相似文献
5.
We used arthrotomography to study the glenoid labrum in 114 patients. Sixty-nine of the patients had anatomic instability of the shoulder (including recurrent dislocation and subluxation of the shoulder), and 45 patients had functional instability of the shoulder (denoted by chronic pain, clicking of the joint, and the sensation that an unstable condition exists without the objective signs of it). Labral tears were revealed arthrotomographically in 86% of the patients with anatomic instability, while only 40% of the patients with functional instability had labral abnormalities, and these were primarily of minor severity. Fifty-six patients (44 of whom had anatomic instability; 12, functional instability) required surgery. The surgical findings were correlated with the arthrotomographic findings, and no false-positive results were revealed. However, arthrotomography demonstrated only part of the pathologic condition of two patients. These results confirm that there is a strong correlation between labral pathologic conditions and anatomic instability of the shoulder. Arthrotomographic studies have a great impact on the selection of therapy in cases of both anatomic and functional instability of the shoulder. 相似文献
6.
Hausegger KA; Cragg AH; Lammer J; Lafer M; Fluckiger F; Klein GE; Sternthal MH; Pilger E 《Radiology》1994,190(1):199
7.
Rosenberg ZS; Jahss MH; Noto AM; Shereff MJ; Cheung Y; Frey CC; Norman A 《Radiology》1988,167(2):489-493
Computed tomography (CT) was performed in 42 patients with 49 clinically suspected tears of the posterior tibial tendon. Twenty-eight of the 49 suspected tears were subsequently surgically explored and repaired. Three patterns of tendon abnormalities were recognized on CT scans: type I-intact, hypertrophied, heterogeneous tendon; type II-attenuated tendon; and type III-absence of a portion of a tendon. Types I and II correlated with partial rupture seen during surgery, and type III correlated with complete rupture of the tendon. CT findings were accurate in 96% of the patients who underwent surgery. In four cases (14%), tendon rupture was seen on CT scans, but the extent of the injury was underestimated and the rupture was misclassified. Reactive periostitis of the distal tibia was seen in 71% of diseased tendons and may represent an important factor in the diagnosis of tendon rupture. 相似文献
8.
9.
Peroneus quartus muscle: MR imaging features 总被引:2,自引:0,他引:2
10.