全文获取类型
收费全文 | 1286篇 |
免费 | 51篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 57篇 |
妇产科学 | 20篇 |
基础医学 | 114篇 |
口腔科学 | 49篇 |
临床医学 | 105篇 |
内科学 | 152篇 |
皮肤病学 | 31篇 |
神经病学 | 16篇 |
特种医学 | 100篇 |
外科学 | 150篇 |
综合类 | 268篇 |
预防医学 | 120篇 |
眼科学 | 5篇 |
药学 | 82篇 |
肿瘤学 | 75篇 |
出版年
2021年 | 13篇 |
2019年 | 14篇 |
2018年 | 8篇 |
2017年 | 10篇 |
2016年 | 9篇 |
2015年 | 37篇 |
2014年 | 20篇 |
2013年 | 30篇 |
2012年 | 35篇 |
2011年 | 25篇 |
2010年 | 57篇 |
2009年 | 54篇 |
2008年 | 48篇 |
2007年 | 59篇 |
2006年 | 77篇 |
2005年 | 65篇 |
2004年 | 69篇 |
2003年 | 41篇 |
2002年 | 34篇 |
2001年 | 31篇 |
2000年 | 37篇 |
1999年 | 38篇 |
1998年 | 49篇 |
1997年 | 59篇 |
1996年 | 57篇 |
1995年 | 34篇 |
1994年 | 31篇 |
1993年 | 13篇 |
1992年 | 18篇 |
1991年 | 22篇 |
1990年 | 21篇 |
1989年 | 24篇 |
1988年 | 25篇 |
1987年 | 21篇 |
1986年 | 18篇 |
1985年 | 19篇 |
1984年 | 19篇 |
1983年 | 5篇 |
1982年 | 11篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 6篇 |
1978年 | 4篇 |
1977年 | 9篇 |
1976年 | 5篇 |
1975年 | 6篇 |
1974年 | 6篇 |
1973年 | 5篇 |
1972年 | 8篇 |
1966年 | 5篇 |
排序方式: 共有1347条查询结果,搜索用时 15 毫秒
1.
SK Raina 《Journal of postgraduate medicine》2015,61(3):213-Sep;61(3):213
2.
3.
4.
In the doubly-labelled water (2H2(18)O) method for the measurement of carbon dioxide production rate in man, single exponential disappearance curves for 2H2O and H2(18)O in body water are used; the precision with which the slopes and intercepts of the curves are estimated determines the precision of the estimate of carbon dioxide production rate. In studies with infants, and in computer simulations, the effect of different experimental regimes on the overall precision of the carbon dioxide production estimate was investigated. When the number of data points used was progressively reduced by shortening the total observation period from 7 d (about 3 biological half-lives for the isotopes) to 1 d there was a deleterious effect on precision and in the infants there was an upward bias in the values for carbon dioxide production. When the number of data points was reduced by removing points from the middle of the exponential curves with the maintenance of the 7-d experimental period, precision was also reduced but by less than in the former procedure and there were no consistent trends in the average values for carbon dioxide production. 相似文献
5.
Sonoelasticity imaging of prostate cancer: in vitro results 总被引:2,自引:0,他引:2
6.
7.
Guntur E Luis Chee-Khuen Yong Deepak A Singh S Sengupta David SK Choon 《Journal of orthopaedic surgery and research》2007,2(1):22-10
Background
Acromioclavicular injuries are common in sports medicine. Surgical intervention is generally advocated for chronic instability of Rockwood grade III and more severe injuries. Various methods of coracoclavicular ligament reconstruction and augmentation have been described. The objective of this study is to compare the biomechanical properties of a novel palmaris-longus tendon reconstruction with those of the native AC+CC ligaments, the modified Weaver-Dunn reconstruction, the ACJ capsuloligamentous complex repair, screw and clavicle hook plate augmentation. 相似文献8.
9.
10.
The magnetic resonance (MR) images of six patients with thrombosis of a dural sinus were reviewed. The diagnosis had been verified by computed tomographic scans in three patients and arteriograms in two; in the sixth patient, only MR imaging was used to confirm the clinical syndrome. In all patients, high-intensity signal was seen from the thrombus within the affected dural sinus on all echoes. This persistent signal intensity allowed intravascular clot to be distinguished from normal causes of increased signal such as flow-related enhancement (entry phenomenon) and even-echo rephasing. MR imaging demonstrated the cause of the thrombosis in three patients: two were secondary to adjacent tumors, and one was secondary to unsuspected mastoiditis. Complications such as infarction were also demonstrated. Using MR imaging, one can easily and safely diagnose thrombosis of a dural sinus. MR should be the imaging method of choice in patients suspected of having thrombosis of a dural sinus. 相似文献