全文获取类型
收费全文 | 748篇 |
免费 | 26篇 |
国内免费 | 28篇 |
专业分类
儿科学 | 27篇 |
妇产科学 | 10篇 |
基础医学 | 74篇 |
口腔科学 | 17篇 |
临床医学 | 53篇 |
内科学 | 102篇 |
皮肤病学 | 18篇 |
神经病学 | 8篇 |
特种医学 | 158篇 |
外科学 | 52篇 |
综合类 | 123篇 |
预防医学 | 27篇 |
药学 | 100篇 |
1篇 | |
肿瘤学 | 32篇 |
出版年
2023年 | 5篇 |
2021年 | 4篇 |
2020年 | 4篇 |
2019年 | 2篇 |
2018年 | 9篇 |
2017年 | 10篇 |
2016年 | 6篇 |
2015年 | 6篇 |
2014年 | 18篇 |
2013年 | 27篇 |
2012年 | 26篇 |
2011年 | 19篇 |
2010年 | 31篇 |
2009年 | 36篇 |
2008年 | 32篇 |
2007年 | 45篇 |
2006年 | 26篇 |
2005年 | 19篇 |
2004年 | 19篇 |
2003年 | 14篇 |
2002年 | 11篇 |
2001年 | 12篇 |
2000年 | 14篇 |
1999年 | 12篇 |
1998年 | 40篇 |
1997年 | 37篇 |
1996年 | 39篇 |
1995年 | 25篇 |
1994年 | 21篇 |
1993年 | 21篇 |
1992年 | 9篇 |
1991年 | 7篇 |
1990年 | 7篇 |
1989年 | 23篇 |
1988年 | 19篇 |
1987年 | 15篇 |
1986年 | 21篇 |
1985年 | 18篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 17篇 |
1981年 | 9篇 |
1980年 | 12篇 |
1979年 | 2篇 |
1978年 | 6篇 |
1977年 | 9篇 |
1976年 | 9篇 |
1975年 | 7篇 |
1955年 | 2篇 |
1953年 | 2篇 |
排序方式: 共有802条查询结果,搜索用时 15 毫秒
91.
Hepatic spiral CT: reduction of dose of intravenous contrast material 总被引:13,自引:0,他引:13
92.
93.
94.
95.
单克隆抗体BDI-I导向的阿霉素白蛋白毫微球对人膀胱癌细胞的特异杀伤活性 总被引:13,自引:0,他引:13
用化学偶联法将抗人膀胱癌单克隆抗体分子偶联到阿霉素白蛋白毫微球上,构建了一个有靶向杀伤性的免疫毫微球,即:阿霉素白蛋白载单克隆抗体毫微球(ADR-NP-Ab)。改变阿霉素毫微球和单克隆抗体的反应分子比,确定了制备该免疫毫微球的最佳条件。经免疫荧光检测及显微照像分析证明,免疫毫微球可有效地和人膀胱癌细胞结合。体外杀伤试验表明,此免疫毫微球对靶细胞EJ有高度特异杀伤活性,而对无关的人直肠癌Lovo细胞则无明显作用。 相似文献
96.
97.
98.
Computed tomography of the thorax 总被引:2,自引:0,他引:2
Computed tomography (CT) provides a valuable new perspective in assessing abnormalities of the thorax. In the patient with a mediastinal mass or widening detected by plain chest radiography, a definitive diagnosis is sometimes possible which would not be obtainable by conventional noninvasive radiological techniques. In certain clinical situations, CT is a highly sensitive modality for examining the lungs. The proved and potential clinical uses of CT in solving diagnostic problems of the thorax are discussed. 相似文献
99.
CY Hang § SS Huang R. Wang YJ Sung† CF Kwok‡ § 《Clinical and experimental pharmacology & physiology》1998,25(2):99-103
1. Trilinolein is a triacylglycerol with linoleic acid as the only type of fatty acid in all three esterified positions of glycerol. It was recently reported to have a myocardial protective effect in coronary ligated rats. We now study its effect on the adhesion of human neutrophils to cultured bovine endothelial cells. 2. Pretreatment of an endothelial monolayer with trilinolein at concentrations ranging from 10-10 to 10-6 mol/L significantly inhibited neutrophil adhesion to endothelial cells. Trilinolein was less potent than sodium nitroprusside in inhibiting neutrophil adhesion. 3. The inhibitory effect of trilinolein was antagonized by methylene blue and NG-nitro-L-arginine methyl ester. The inhibitory effect of trilinolein was not mediated through linoleic acid because linoleic acid did not inhibit neutrophil adhesion. 4. Pretreatment of neutrophils with trilinolein did not reduce neutrophil adhesion. However, in neutrophils activated with N-formyl-methionyl-leucyl-phenylalanine, trilinolein inhibited the neutrophil adhesion to endothelial cells. 5. We conclude that trilinolein inhibits neutrophil adhesion to the endothelial monolayer by stimulating the nitric oxide and cyclic GMP pathways in endothelial cells. It may also inhibit neutrophil adhesion by scavenging free radicals. The inhibitory effect of trilinolein on neutrophil adhesion may play a role in its myocardial protective activity. 相似文献
100.
Two flavonoids were isolated from the leaves of Glycyrrhiza uralensis Fisch (Licorice, Leguminosae). On the basis of physico-chemical properties and spectroscopy (UV, 1HNMR and MS), a new compound was elucidated as 3,5,7,4′-tetrahydroxy-3′-methoxy- 6-isoprenyl flavone (gancaonin P-3′-methylether) and another known compound was identified as 8-C-prenyleriodictyol. 相似文献