全文获取类型
收费全文 | 1108篇 |
免费 | 54篇 |
国内免费 | 56篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 68篇 |
妇产科学 | 8篇 |
基础医学 | 121篇 |
口腔科学 | 21篇 |
临床医学 | 143篇 |
内科学 | 264篇 |
皮肤病学 | 51篇 |
神经病学 | 19篇 |
特种医学 | 298篇 |
外科学 | 45篇 |
综合类 | 23篇 |
预防医学 | 39篇 |
眼科学 | 5篇 |
药学 | 55篇 |
中国医学 | 2篇 |
肿瘤学 | 55篇 |
出版年
2023年 | 4篇 |
2022年 | 3篇 |
2021年 | 8篇 |
2020年 | 9篇 |
2019年 | 8篇 |
2018年 | 17篇 |
2017年 | 3篇 |
2016年 | 6篇 |
2015年 | 13篇 |
2014年 | 13篇 |
2013年 | 39篇 |
2012年 | 20篇 |
2011年 | 12篇 |
2010年 | 35篇 |
2009年 | 55篇 |
2008年 | 18篇 |
2007年 | 53篇 |
2006年 | 20篇 |
2005年 | 21篇 |
2004年 | 11篇 |
2003年 | 11篇 |
2002年 | 13篇 |
2001年 | 13篇 |
2000年 | 14篇 |
1999年 | 19篇 |
1998年 | 71篇 |
1997年 | 80篇 |
1996年 | 101篇 |
1995年 | 61篇 |
1994年 | 58篇 |
1993年 | 52篇 |
1992年 | 16篇 |
1991年 | 15篇 |
1990年 | 20篇 |
1989年 | 37篇 |
1988年 | 36篇 |
1987年 | 34篇 |
1986年 | 44篇 |
1985年 | 40篇 |
1984年 | 8篇 |
1983年 | 14篇 |
1982年 | 13篇 |
1981年 | 9篇 |
1980年 | 11篇 |
1979年 | 8篇 |
1978年 | 12篇 |
1977年 | 9篇 |
1976年 | 13篇 |
1975年 | 13篇 |
1973年 | 2篇 |
排序方式: 共有1218条查询结果,搜索用时 15 毫秒
71.
Venous clots: evaluation with MR imaging 总被引:2,自引:0,他引:2
In vitro and in vivo studies were performed to determine the proton relaxation and imaging characteristics of static blood and acute and organized clot in canine jugular veins. In vivo, it was found that two inversion recovery sequences using a short inversion time (100 msec) demonstrated better differentiation of signal intensity of intravascular clot from surrounding soft tissues than did standard T1- and T2-weighted sequences. In vitro, quantitative measurements showed marked reduction of both T1 and T2 relaxation time of acute clot compared with stagnant blood. In addition, the T1 relaxation time, and to a lesser extent the T2 relaxation time, shortened as the clot aged, indicating a potential role for magnetic resonance imaging in determining the age of venous thrombi. 相似文献
72.
73.
High-field surface coil magnetic resonance (MR) images were obtained of 12 ankles: two from healthy volunteers, seven from patients, and three from fresh cadavers. The cadaver ankles were sectioned in the coronal, sagittal, and axial planes for direct comparison with the MR images. Plain film confirmation of pathologic conditions was obtained in all patients, and five underwent arthroscopy or surgery, or both. MR imaging provided excellent delineation of ligaments and cartilaginous structures in all cases. 相似文献
74.
75.
7-(1,7-双取代-1,4-二氢-4-酮-1,8-萘啶-3-甲酰氨基)头孢菌素的合成 总被引:1,自引:0,他引:1
本文报道了以1,7-双取代-1,4-二氢-4-酮-1,8-萘啶-3-羧酸,用混合酸酐法与7-ACA,7-ADCA,7-ACT和7-ACD缩合,合成了24个1,7-双取代-1,4-二氢-4-酮-1,8-萘啶-3-甲酰胺头孢菌素衍生物,通过葡聚糖凝胶(Sephadex LH-20)及离心薄层层析纯化精制,得到纯品。体外抑菌试验结果表明:大多数新头孢菌素衍生物对革兰氏阳性菌具有较好的抗菌作用。尚有一些新头孢菌素衍生物对某些革兰氏阴性菌具有中等敏感程度。 相似文献
76.
77.
To test the feasibility of teleradiology for use with excretory urograms obtained in the emergency department in cases for suspected renal colic, radiographs from 43 patients were digitized, transmitted via standard phone lines, and viewed on a video monitor 2 miles distant. Diagnostic interpretations of the video image and the original radiograph were reviewed for degree of concordance. The video and film images of the 27 examinations showing obstruction were interpreted with 100% correlation. Agreement as to the site of obstruction was present in 93% of cases. Only two-thirds of renal and ureteral calculi seen on the radiographs were discerned on the video images, however. Teleradiology proved as useful for ongoing monitoring and modification of these examinations as for initial interpretation. 相似文献
78.
79.
80.