全文获取类型
收费全文 | 447篇 |
免费 | 21篇 |
国内免费 | 14篇 |
专业分类
儿科学 | 20篇 |
妇产科学 | 4篇 |
基础医学 | 31篇 |
口腔科学 | 6篇 |
临床医学 | 48篇 |
内科学 | 75篇 |
皮肤病学 | 11篇 |
神经病学 | 15篇 |
特种医学 | 139篇 |
外科学 | 18篇 |
综合类 | 33篇 |
预防医学 | 26篇 |
眼科学 | 12篇 |
药学 | 26篇 |
中国医学 | 1篇 |
肿瘤学 | 17篇 |
出版年
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 5篇 |
2017年 | 4篇 |
2016年 | 2篇 |
2015年 | 4篇 |
2014年 | 6篇 |
2013年 | 11篇 |
2012年 | 3篇 |
2011年 | 3篇 |
2010年 | 12篇 |
2009年 | 16篇 |
2008年 | 11篇 |
2007年 | 7篇 |
2006年 | 14篇 |
2005年 | 10篇 |
2004年 | 3篇 |
2003年 | 7篇 |
2002年 | 11篇 |
2001年 | 8篇 |
2000年 | 6篇 |
1999年 | 12篇 |
1998年 | 25篇 |
1997年 | 38篇 |
1996年 | 26篇 |
1995年 | 24篇 |
1994年 | 24篇 |
1993年 | 18篇 |
1992年 | 4篇 |
1991年 | 11篇 |
1990年 | 6篇 |
1989年 | 24篇 |
1988年 | 15篇 |
1987年 | 16篇 |
1986年 | 10篇 |
1985年 | 11篇 |
1984年 | 6篇 |
1983年 | 10篇 |
1982年 | 9篇 |
1981年 | 11篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1969年 | 1篇 |
排序方式: 共有482条查询结果,搜索用时 0 毫秒
71.
Edgar T. Iwamoto E.C. Williamson Charles Wash Ray Hancock 《Pharmacology, biochemistry, and behavior》1984,20(6):959-963
A new drug infusion pump capable of injecting nanoliter volumes of drug solution into the brains of awake rats has been constructed which incorporates a new “turntable” commutator and a compact tubing compressor mechanism requiring no gears. Injector cannulas inserted into guide cannulas permanently mounted in the rat's skull are connected to the drug pump by spring-protected, PE 10 tubing. Drug solutions are delivered when the pump rollers compress the drug-filled PE 10 tubing. An additional animal-activated switch and motorized mechanism rotates the drug pump in response to the animal's movements so that the PE 10 drug reservoir is not twisted. Testing the drug pump's performance in vivo with injections of 14C-nicotine into the caudate nucleus shows that drug delivery is both reliable and reproducible. 相似文献
72.
73.
74.
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
75.
76.
Choyke PL; Frank JA; Girton ME; Inscoe SW; Carvlin MJ; Black JL; Austin HA; Dwyer AJ 《Radiology》1989,170(3):713
77.
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
78.
79.
Complications of spinal cord arteriography: prospective assessment of risk for diagnostic procedures
Forbes G; Nichols DA; Jack CR Jr; Ilstrup DM; Kispert DB; Piepgras DG; Wiebers DO; Earnest F th; Axley PL 《Radiology》1988,169(2):479-484
A prospective study was done of complications associated with 134 consecutive diagnostic spinal cord arteriograms in 96 patients (63 men and 33 women aged 17-78 years). Patients were examined for either arteriovenous malformation (n = 88) or tumor (n = 8), as indicated by myelography. Among the complications, 11 (8.2%) were local, five (3.7%) were systemic nonneurologic, and three (2.2%) were neurologic (two were associated with full recovery in less than 24 hours, and one was associated with full recovery in less than 1 week). No specific clinical or technical factors were significantly associated with the development of neurologic complications. Details of the clinical profile, angiographic technique, and pathologic findings for each patient were recorded and analyzed with respect to the potential risk for arteriographic complications. Diagnostic spinal cord arteriography had an acceptable risk within the range of other neuroangiographic diagnostic procedures. 相似文献
80.