全文获取类型
收费全文 | 1006篇 |
免费 | 51篇 |
国内免费 | 39篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 34篇 |
妇产科学 | 9篇 |
基础医学 | 123篇 |
口腔科学 | 20篇 |
临床医学 | 118篇 |
内科学 | 207篇 |
皮肤病学 | 7篇 |
神经病学 | 42篇 |
特种医学 | 217篇 |
外科学 | 100篇 |
综合类 | 18篇 |
预防医学 | 27篇 |
眼科学 | 7篇 |
药学 | 90篇 |
肿瘤学 | 71篇 |
出版年
2023年 | 4篇 |
2022年 | 3篇 |
2021年 | 9篇 |
2020年 | 6篇 |
2019年 | 5篇 |
2018年 | 19篇 |
2017年 | 8篇 |
2016年 | 9篇 |
2015年 | 14篇 |
2014年 | 20篇 |
2013年 | 21篇 |
2012年 | 24篇 |
2011年 | 16篇 |
2010年 | 20篇 |
2009年 | 35篇 |
2008年 | 21篇 |
2007年 | 45篇 |
2006年 | 29篇 |
2005年 | 22篇 |
2004年 | 22篇 |
2003年 | 31篇 |
2002年 | 25篇 |
2001年 | 37篇 |
2000年 | 43篇 |
1999年 | 34篇 |
1998年 | 55篇 |
1997年 | 50篇 |
1996年 | 47篇 |
1995年 | 35篇 |
1994年 | 26篇 |
1993年 | 38篇 |
1992年 | 20篇 |
1991年 | 23篇 |
1990年 | 14篇 |
1989年 | 34篇 |
1988年 | 23篇 |
1987年 | 27篇 |
1986年 | 16篇 |
1985年 | 25篇 |
1984年 | 20篇 |
1983年 | 23篇 |
1982年 | 17篇 |
1981年 | 17篇 |
1980年 | 22篇 |
1979年 | 3篇 |
1978年 | 9篇 |
1977年 | 9篇 |
1976年 | 8篇 |
1975年 | 5篇 |
1968年 | 2篇 |
排序方式: 共有1096条查询结果,搜索用时 15 毫秒
1.
2.
J G Bova N E Dutton H M Goldstein L J Hoberman 《AJR. American journal of roentgenology》1987,148(4):731-732
Although medication-induced esophagitis is recognized more frequently nowadays, reports of associated radiographic findings are limited. Nine cases of esophagitis associated with various medications were evaluated by using double-contrast esophagography. The usual features were several discrete focal ulcerations localized to a short segment of the proximal half of the esophagus. In seven of the cases, the offending medication was an antibiotic. Symptoms resolved in about 4 days after medication was discontinued. Finding characteristic radiologic abnormalities in the appropriate clinical setting may obviate endoscopy. 相似文献
3.
4.
5.
Normal and diseased isolated lungs: high-resolution CT 总被引:8,自引:0,他引:8
6.
7.
The adhesion of hematopoietic progenitor cells to bone marrow stromal cells is critical to hematopoiesis and involves multiple effector molecules. Stromal cell molecules that participate in this interaction were sought by analyzing the detergent-soluble membrane proteins of GBI/6 stromal cells that could be adsorbed by intact FDCP-1 progenitor cells. A single-chain protein from GBI/6 cells having an apparent molecular weight of 37 Kd was selectively adsorbed by FDCP-1 cells. This protein, designated p37, could be surface-radiolabeled and thus appeared to be exposed on the cell membrane. An apparently identical 37- Kd protein was expressed by three stromal cell lines, by Swiss 3T3 fibroblastic cells, and by FDCP-1 and FDCP-2 progenitor cells. p37 was selectively adsorbed from membrane lysates by a variety of murine hematopoietic cells, including erythrocytes, but not by human erythrocytes. Binding of p37 to cells was calcium-dependent, and was not affected by inhibitors of the hematopoietic homing receptor or the cell-binding or heparin-binding functions of fibronectin. It is proposed that p37 may be a novel adhesive molecule expressed on the surface of a variety of hematopoietic cells that could participate in both homotypic and heterotypic interactions of stromal and progenitor cells. 相似文献
8.
Francesco Ferrozzi Davide Bova Fabio Campodonico 《Seminars in Ultrasound, CT and MRI》1997,18(2):115-121
Since the advent of CT, secondary neoplastic lesions of the kidneys have been detected with increasing frequency. After reviewing a large series of cases of renal metastases, we have been able to classify the CT findings into seven major categories that are discussed and illustrated in this article. The differential diagnoses between metastatic disease of the kidneys and other lesions such as renal infarctions, renal lymphoma, and primary malignancies are also considered. 相似文献
9.
10.