全文获取类型
收费全文 | 1210篇 |
免费 | 57篇 |
国内免费 | 149篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 60篇 |
妇产科学 | 6篇 |
基础医学 | 96篇 |
口腔科学 | 20篇 |
临床医学 | 190篇 |
内科学 | 328篇 |
皮肤病学 | 30篇 |
神经病学 | 26篇 |
特种医学 | 315篇 |
外科学 | 61篇 |
综合类 | 28篇 |
预防医学 | 51篇 |
眼科学 | 31篇 |
药学 | 114篇 |
1篇 | |
肿瘤学 | 57篇 |
出版年
2021年 | 7篇 |
2019年 | 9篇 |
2018年 | 18篇 |
2017年 | 9篇 |
2016年 | 14篇 |
2015年 | 17篇 |
2014年 | 23篇 |
2013年 | 34篇 |
2012年 | 17篇 |
2011年 | 20篇 |
2010年 | 39篇 |
2009年 | 42篇 |
2008年 | 31篇 |
2007年 | 111篇 |
2006年 | 28篇 |
2005年 | 32篇 |
2004年 | 17篇 |
2003年 | 7篇 |
2002年 | 21篇 |
2001年 | 22篇 |
2000年 | 13篇 |
1999年 | 18篇 |
1998年 | 78篇 |
1997年 | 76篇 |
1996年 | 71篇 |
1995年 | 61篇 |
1994年 | 42篇 |
1993年 | 53篇 |
1992年 | 10篇 |
1991年 | 16篇 |
1990年 | 14篇 |
1989年 | 56篇 |
1988年 | 35篇 |
1987年 | 33篇 |
1986年 | 30篇 |
1985年 | 34篇 |
1984年 | 21篇 |
1983年 | 16篇 |
1982年 | 28篇 |
1981年 | 17篇 |
1980年 | 14篇 |
1979年 | 11篇 |
1978年 | 7篇 |
1977年 | 19篇 |
1976年 | 31篇 |
1975年 | 18篇 |
1974年 | 7篇 |
1973年 | 7篇 |
1972年 | 10篇 |
1971年 | 8篇 |
排序方式: 共有1416条查询结果,搜索用时 0 毫秒
1.
2.
3.
Intestinal schistosomiasis japonica: CT-pathologic correlation 总被引:1,自引:0,他引:1
Lee RC; Chiang JH; Chou YH; Rubesin SE; Wu HP; Jeng WC; Hsu CC; Tiu CM; Chang T 《Radiology》1994,193(2):539
4.
5.
6.
The patellofemoral joint was imaged with magnetic resonance (MR) in the axial plane while the knee was positioned from 0 degrees to 32 degrees of flexion (nine positions). These multiple sequential images obtained within the early phases of flexion of the knee were viewed in a "cine-loop" format, producing a kinematic study that clearly demonstrated the relationship of the patella to the trochlear groove. Four healthy subjects and one patient with known bilateral subluxing patellae were studied. The preliminary results suggest that kinematic MR imaging of the patellofemoral joint is potentially useful for the evaluation of patellar tracking abnormalities. 相似文献
7.
The ability of iron to stimulate the growth of L1210 cells both in DBA-2 mice and in cell culture is evaluated. Although in vitro stimulation is absent, in vivo studies clearly indicate higher numbers of tumor cells in the presence of supplemental iron. When mice were given iron i.p., at levels comparable to clinical doses for humans (24 mg/kg body weight), the tumor load recovered from their peritoneum was substantially greater than from controls without iron supplements. Furthermore, at higher levels of supplemental iron (250 mg Fe/kg body weight), the pretreated animals inoculated with L1210 cells died in 9.7 d whereas controls died in 12.2 d (i.e., 25% faster). As expected, the lower iron dose (24 mg/kg) also resulted in shorter life spans, although the effects were less striking. It is the belief of these authors that these data support the opinion that "anemia of chronic disease" associated with leukemia and possibly other malignancies may represent a host defense mechanism as has been postulated by others (1, 8). 相似文献
8.
9.
Marrow regeneration after mechanical depletion 总被引:1,自引:0,他引:1
The origin of marrow regeneration after mechanical depletion was reinvestigated in mouse chimeras. The results were compatible with the local origin of stem cells from remnants of incompletely removed marrow, but not with their origin from a common precursor of both bone and hemopoietic cell lines. In transplanted femurs depleted by a modified technique of in vivo evacuation of marrow, hemopoietic regeneration failed to occur. The presence of hemopoietic stem cells in the Haversian canals was thus excluded. The demonstration of ample hemopoiesis with minimal bone formation in nondepleted controls in which bone marrow initially became necrotic provided new evidence that osteogenesis was not a prerequisite of hemopoietic regeneration. 相似文献
10.
A 15 year old boy with autoimmune polyendocrinopathy-candidosis-ectodermal dystrophy syndrome suffered recurrent episodes of severe intractable diarrhoea, steatorrhoea, and hypocalcaemia. The only treatment modality, which controlled the malabsorption syndrome, was immunosuppression with intravenous high dose methylprednisolone and oral methotrexate maintenance therapy. 相似文献