全文获取类型
收费全文 | 479篇 |
免费 | 17篇 |
国内免费 | 43篇 |
专业分类
儿科学 | 16篇 |
妇产科学 | 4篇 |
基础医学 | 43篇 |
口腔科学 | 14篇 |
临床医学 | 67篇 |
内科学 | 73篇 |
皮肤病学 | 1篇 |
神经病学 | 11篇 |
特种医学 | 81篇 |
外科学 | 110篇 |
综合类 | 21篇 |
预防医学 | 26篇 |
眼科学 | 4篇 |
药学 | 42篇 |
中国医学 | 1篇 |
肿瘤学 | 25篇 |
出版年
2023年 | 6篇 |
2021年 | 5篇 |
2020年 | 5篇 |
2019年 | 6篇 |
2018年 | 5篇 |
2017年 | 6篇 |
2016年 | 7篇 |
2015年 | 7篇 |
2014年 | 13篇 |
2013年 | 9篇 |
2012年 | 11篇 |
2010年 | 14篇 |
2009年 | 15篇 |
2008年 | 7篇 |
2007年 | 33篇 |
2006年 | 18篇 |
2005年 | 15篇 |
2004年 | 13篇 |
2003年 | 11篇 |
2002年 | 7篇 |
2001年 | 12篇 |
2000年 | 13篇 |
1999年 | 11篇 |
1998年 | 20篇 |
1997年 | 11篇 |
1996年 | 9篇 |
1995年 | 9篇 |
1994年 | 9篇 |
1993年 | 8篇 |
1992年 | 10篇 |
1991年 | 8篇 |
1990年 | 11篇 |
1989年 | 24篇 |
1988年 | 20篇 |
1987年 | 12篇 |
1986年 | 14篇 |
1985年 | 11篇 |
1983年 | 4篇 |
1982年 | 8篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 11篇 |
1978年 | 5篇 |
1977年 | 10篇 |
1976年 | 7篇 |
1975年 | 8篇 |
1973年 | 8篇 |
1972年 | 6篇 |
1971年 | 4篇 |
1969年 | 5篇 |
排序方式: 共有539条查询结果,搜索用时 15 毫秒
1.
Proximal tibial varus osteotomy for osteoarthritis of the lateral compartment of the knee 总被引:4,自引:0,他引:4
M B Coventry 《The Journal of bone and joint surgery. American volume》1987,69(1):32-38
From 1960 through 1979, a closing-wedge varus osteotomy of the proximal part of the tibia was performed in thirty-one knees (twenty-eight patients) for painful osteoarthritis of the lateral compartment of the knee that was associated with a valgus deformity. The patients were followed for two to seventeen years (average, 9.4 years). Twenty-four knees (77 per cent) had either no pain or only occasional mild pain at the last evaluation. Six knees had moderate pain and one, severe pain. Six knees required a subsequent total knee arthroplasty at an average of 9.8 years after the osteotomy. No patient had an infection or non-union. Osteotomy of the proximal part of the tibia is a reasonable method of treating unicompartmental degenerative arthritis in a knee with a valgus deformity. Although some patients with as much as 20 degrees of anatomical valgus deformity obtained a good result in this series, osteotomy in the supracondylar region of the femur is probably preferable if the valgus angulation exceeds 12 degrees or if the tilt of the tibial articular surface that will result from the surgery will exceed 10 degrees. Correction beyond the normal 5 to 7 degrees of valgus angulation to zero degree of anatomical tibiofemoral alignment is recommended to prevent recurrence of the valgus deformity and to decrease the load on the lateral tibiofemoral compartment. 相似文献
2.
Two fast magnetic resonance (MR) imaging techniques, advanced Fourier and partial-flip imaging, were used at 0.35 T to examine 21 patients with suspected intracranial lesions; the results were quantitatively compared with a conventional spin-echo study. Both of the fast MR techniques yielded a fourfold reduction in imaging time per section. The advanced Fourier sequence showed contrast that was identical to the conventional spin-echo study with signal-to-noise ratios of 58% and 57% for the first and second echoes, respectively. The partial-flip sequence showed a contrast of 109% and 57% for lesions versus substantia alba, and 107% and 78% for substantia grisea versus substantia alba relative to the first and second echoes of the conventional spin-echo study. The partial-flip sequence was particularly sensitive to magnetic susceptibility; this produced artifacts that may undermine the usefulness of partial flip for routine screening in certain parts of the brain. However, this susceptibility significantly improved the detection of intracranial hemorrhage when compared with the spin-echo sequence, particularly when combined with phase mapping of the partial-flip study. 相似文献
3.
4.
5.
We describe a new method for the percutaneous drainage of pancreatic pseudocysts using a transgastric approach. We used this technique in three dogs and six patients for whom no other "safe" access route was available. The procedures were performed under US guidance alone or with US combined with fluoroscopy. No complications were observed. 相似文献
6.
Internet网上细胞凋亡研究的信息资源及其利用 总被引:1,自引:0,他引:1
0 引言 Internet网上含有丰富的信息资源 ,科研人员可以通过 Internet网了解其所研究领域的最新发展动态 ,获取全面和系统的科研信息 ,有利于进行学术交流[1 ] .然而网上信息浩如烟海 ,当检索某一专门领域的资料时 ,有时无从下手 .我们在科研实践中对 Internet网上主要的细胞凋亡研究信息资源及其查找方法进行了归纳 .1 细胞凋亡专业网站1. 1 The Cell death society (http:/ / www.celldeath-apoptosis.org) 为美国细胞死亡学会主办 ,概括了细胞凋亡和程序性细胞死亡研究的各个领域 ,包括与细胞凋亡有关的各种疾病 .可以免费注册… 相似文献
7.
Willner P D'Aquila PS Coventry T Brain P 《Journal of psychopharmacology (Oxford, England)》1995,9(3):207-213
Stable dominance hierarchies were determined in pairs of male Lister hooded rats, by repeated observation of agonistic behaviour at the onset of the dark phase of the light-dark cycle. No lasting alterations in dominance behaviour were caused by subjecting the dominant member of the pair either to restraint stress or to defeat by another dominant animal. However, defeat of the dominant animal by a male of the aggressive Tryon Maze Dull (TMD) strain caused a loss of dominant status in the home cage which lasted at least 7 days. Repeated weekly defeat by TMD animals decreased both home cage dominance behaviour and consumption of a palatable sucrose solution, relative to non-defeated animals; both behaviours were normalized in defeated animals by 3 weeks of treatment with the tricyclic antidepressant imipramine. 相似文献
8.
Current public health advice is that high ultraviolet radiation (UVR) exposure is the primary cause of Malignant Melanoma of skin (CMM), however, despite the use of sun-blocking products incidence of melanoma is increasing. To investigate the UVR influence on CMM incidence worldwide WHO, United Nations, World Bank databases and literature provided 182 country-specific melanoma incidence estimates, daily UVR levels, skin colour (EEL), socioeconomic status (GDP PPP), magnitude of reduced natural selection (Ibs), ageing, urbanization, percentage of European descendants (Eu%), and depigmentation (blonde hair colour), for parametric and non-parametric correlations, multivariate regressions and analyses of variance. Worldwide, UVR levels showed negative correlation with melanoma incidence (“rho” = −0.515, p < 0.001), remaining significant and negative in parametric partial correlation (r = −0.513, p < 0.001) with other variables kept constant. After standardising melanoma incidence for Eu%, melanoma correlation with UVR disappeared completely (“rho” = 0.004, p = 0.967, n = 127). The results question classical views that UVR causes melanoma. No correlation between UVR level and melanoma incidence was present when Eu% (depigmented or light skin type) was kept statistically constant, even after adjusting for other known variables. Countries with lower UVR levels and more Eu% (depigmented or light skin people) have higher melanoma incidence. Critically, this means that individual genetic low skin pigmentation factors predict melanoma risk regardless of UVR exposure levels, and even at low-UVR levels. 相似文献
9.
10.
为了寻找毒性低、增敏作用强的乏氧细胞放射增敏剂,设计并合成了一系列5-溴-,5-甲基-,和5-未取代的3-硝基-1,2,4-三唑-1-乙酰胺类化合物,用HeLaS3细胞进行了体外试验。结果表明5-溴取代衍生物的增敏作用强于相应的5-甲基-或5-未取代的硝基三唑衍生物,但是它们的毒性亦增大。修饰1位乙酰胺侧链也可以改变化合物的增敏作用和亲脂性。在所测定的化合物中TA-101[2-(3-硝基-1-三唑基)乙酰胺]由于有高的增敏作用和低亲脂性,可能是一个有希望的放射增敏剂。 相似文献