全文获取类型
收费全文 | 991篇 |
免费 | 59篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 47篇 |
妇产科学 | 6篇 |
基础医学 | 115篇 |
口腔科学 | 44篇 |
临床医学 | 88篇 |
内科学 | 185篇 |
皮肤病学 | 40篇 |
神经病学 | 54篇 |
特种医学 | 160篇 |
外国民族医学 | 1篇 |
外科学 | 91篇 |
综合类 | 39篇 |
预防医学 | 80篇 |
眼科学 | 8篇 |
药学 | 48篇 |
中国医学 | 1篇 |
肿瘤学 | 46篇 |
出版年
2021年 | 3篇 |
2020年 | 4篇 |
2019年 | 7篇 |
2018年 | 10篇 |
2017年 | 13篇 |
2016年 | 14篇 |
2015年 | 27篇 |
2014年 | 16篇 |
2013年 | 32篇 |
2012年 | 29篇 |
2011年 | 27篇 |
2010年 | 38篇 |
2009年 | 48篇 |
2008年 | 31篇 |
2007年 | 30篇 |
2006年 | 30篇 |
2005年 | 29篇 |
2004年 | 42篇 |
2003年 | 27篇 |
2002年 | 20篇 |
2001年 | 16篇 |
2000年 | 16篇 |
1999年 | 26篇 |
1998年 | 54篇 |
1997年 | 67篇 |
1996年 | 58篇 |
1995年 | 43篇 |
1994年 | 41篇 |
1993年 | 38篇 |
1992年 | 11篇 |
1991年 | 16篇 |
1990年 | 17篇 |
1989年 | 16篇 |
1988年 | 25篇 |
1987年 | 24篇 |
1986年 | 22篇 |
1985年 | 9篇 |
1984年 | 4篇 |
1983年 | 9篇 |
1982年 | 18篇 |
1981年 | 3篇 |
1980年 | 9篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1976年 | 7篇 |
1975年 | 2篇 |
1968年 | 3篇 |
1959年 | 2篇 |
1937年 | 1篇 |
排序方式: 共有1059条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
B. P. van der Sanden P. F. Rijken A. Heerschap H. J. Bernsen A. J. van der Kogel 《British journal of cancer》1997,75(10):1432-1438
The relationship between the bioenergetic status of human glioma xenografts in nude mice and morphometric parameters of the perfused vascular architecture was studied using (31)P magnetic resonance spectroscopy (MRS), fluorescence microscopy and two-dimensional digital image analysis. Two tumour lines with a different vascular architecture were used for this study. Intervascular distances and non-perfused area fractions varied greatly between tumours of the same line and tumours of different lines. The inorganic phosphate-nucleoside triphosphate (P(i)/NTP) ratio increased rapidly as mean intervascular distances increased from 100 microm to 300 microm. Two morphometric parameters - the percentage of intervascular distances larger than 200 microm (ivd200) and the non-perfused area fraction at a distance larger than 100 microm from a nearest perfused vessel (area100), - were deduced from these experiments and related to the P(i)/NTP ratio of the whole tumour. It is assumed that an aerobic to anaerobic transition influences the bioenergetic status, i.e. the P(i)/NTP ratio increased linearly with the percentage of ivd200 and the area100. 相似文献
5.
Ketai LH; Williamson MR; Telepak RJ; Levy H; Koster FT; Nolte KB; Allen SE 《Radiology》1994,191(3):665
6.
7.
8.
9.
S. van Ruth† EBL van Dorst‡ MR Canninga-van Dijk§ MS de Bruin-Weller† 《Journal of the European Academy of Dermatology and Venereology》2007,21(5):678-680
Cutaneous metastasis of vaginal carcinoma is extremely rare. So far, the total number of reported skin metastasis of vaginal carcinoma is only one. We present another case with an unusual manifestation of vagina carcinoma metastasis: skin metastasis presenting as a leg ulcer on the lower leg. 相似文献
10.
A 38-year-old layer of parquet flooring was referred because of memory impairment, tiredness and diffuse headaches. His work involved using several neurotoxic organic solvents. Extensive laboratory, neuropsychological, clinical neurophysiological, neuroadiological, magnetic resonance (MR) imaging and spectroscopy studies were performed. The neuropsychological and behavioural assessments showed an organic brain syndrome. MR imaging and CT scanning of the brain revealed enlarged ventricles and generalized atrophy. 31P and 1H MR spectroscopic measurements did not show any abnormalities. Owing to recent improvements regarding sensitivity and facilitated assignment, MR spectroscopy may provide in the near future significant additional information on brain metabolism in patients with brain dysfunction presumably induced by organic solvents. 相似文献