全文获取类型
收费全文 | 2047篇 |
免费 | 201篇 |
国内免费 | 32篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 198篇 |
妇产科学 | 54篇 |
基础医学 | 256篇 |
口腔科学 | 93篇 |
临床医学 | 184篇 |
内科学 | 425篇 |
皮肤病学 | 55篇 |
神经病学 | 80篇 |
特种医学 | 196篇 |
外科学 | 309篇 |
综合类 | 50篇 |
一般理论 | 1篇 |
预防医学 | 123篇 |
眼科学 | 43篇 |
药学 | 87篇 |
中国医学 | 2篇 |
肿瘤学 | 118篇 |
出版年
2023年 | 18篇 |
2022年 | 14篇 |
2021年 | 19篇 |
2020年 | 20篇 |
2019年 | 18篇 |
2018年 | 54篇 |
2017年 | 54篇 |
2016年 | 50篇 |
2015年 | 70篇 |
2014年 | 88篇 |
2013年 | 129篇 |
2012年 | 82篇 |
2011年 | 54篇 |
2010年 | 97篇 |
2009年 | 103篇 |
2008年 | 56篇 |
2007年 | 67篇 |
2006年 | 72篇 |
2005年 | 52篇 |
2004年 | 47篇 |
2003年 | 34篇 |
2002年 | 33篇 |
2001年 | 36篇 |
2000年 | 33篇 |
1999年 | 41篇 |
1998年 | 111篇 |
1997年 | 91篇 |
1996年 | 100篇 |
1995年 | 67篇 |
1994年 | 78篇 |
1993年 | 40篇 |
1992年 | 21篇 |
1991年 | 31篇 |
1990年 | 18篇 |
1989年 | 42篇 |
1988年 | 39篇 |
1987年 | 38篇 |
1986年 | 36篇 |
1985年 | 35篇 |
1984年 | 21篇 |
1983年 | 10篇 |
1982年 | 24篇 |
1981年 | 15篇 |
1980年 | 18篇 |
1979年 | 7篇 |
1978年 | 11篇 |
1977年 | 11篇 |
1976年 | 14篇 |
1975年 | 11篇 |
1970年 | 8篇 |
排序方式: 共有2280条查询结果,搜索用时 62 毫秒
91.
Hematopoietic growth factors (HGFs) interleukin-3 (IL-3) and granulocyte-macrophage colony-stimulating factor (GM-CSF) individually have been shown to increase the percentage of acute myeloid leukemia (AML) blasts in S phase and enhance the cytotoxic effects of Ara-C against these blasts in culture. We compared in vitro the effects of a combined treatment with GM-CSF (10 ng/mL) plus IL-3 (10 ng/mL) on the metabolism and cytotoxicity of Ara-C in normal bone marrow mononuclear cells (NBMMC) and AML blasts. NBMMC from six healthy volunteers and AML blasts from 10 patients were incubated for 20 hours with or without IL- 3 plus GM-CSF, followed by a concurrent treatment with Ara-C for 4 additional hours. Exposure to the HGFs and Ara-C produced significantly higher intracellular Ara-CTP levels as well as higher Ara-CTP/dCTP pool ratios in AML blasts as compared with NBMMC. Treatment with HGFs resulted in [3H] Ara-C DNA incorporation that was significantly higher in AML blasts versus NBMMC. This selective improvement of Ara-C metabolism in AML blasts was associated with an enhanced Ara-C-mediated leukemia colony-forming unit (CFU) growth inhibition. In contrast, exposure to HGFs resulted in an improved colony growth of normal CFU granulocyte-monocyte and CFU-granulocyte, erythroid, monocyte, megakaryocyte. These in vitro studies indicate that a combined treatment with IL-3 plus GM-CSF may improve the selectivity of Ara-C against AML blasts. 相似文献
92.
93.
94.
95.
96.
Lineage-restricted regulation of the murine SCL/TAL-1 promoter 总被引:10,自引:2,他引:10
Bockamp EO; McLaughlin F; Murrell AM; Gottgens B; Robb L; Begley CG; Green AR 《Blood》1995,86(4):1502-1514
97.
Development of large numbers of mast cells at sites of idiopathic chronic dermatitis in genetically mast cell-deficient WBB6F1-W/Wv mice 总被引:15,自引:1,他引:15
The normal skin and other tissues of adult mast cell-deficient WBB6F1- W/Wv or WCB6F1-Sl/Sld mice contain less than 1.0% the number of mast cells present in the corresponding tissues of the congenic normal (+/+) mice. As a result, genetically mast cell-deficient WBB6F1-W/Wv or WCB6F1-Sl/Sld mice are widely used for studies of mast cell differentiation and function. We found that mast cells developed at sites of idiopathic chronic dermatitis in WBB6F1-W/Wv mice and that the number of mast cells present in the skin of WBB6F1-W/Wv mice was proportional to the severity of the dermatitis (in ear skin, there were 33 +/- 4 mast cells/mm2 of dermis at sites of severe dermatitis v 9 +/- 3 at sites of mild dermatitis, 0.8 +/- 0.3 in skin without dermatitis, and 100 +/- 7 in the normal skin of congenic WBB6F1-+/+ mice; in back skin, the corresponding values were 2.0 +/- 0.6, 1.1 +/- 0.9, 0.025 +/- 0.025, and 26.2 +/- 3.2). The development of mast cells was a local, not systemic, consequence of the dermatitis. Thus, WBB6F1-W/Wv mice with severe dermatitis lacked mast cells in skin not showing signs of dermatitis and also in the peritoneal cavity, stomach, cecum, and tongue. Idiopathic chronic dermatitis was not associated with the local development of mast cells in WCB6F1-Sl/Sld mice, a mutant whose mast cell deficiency is due to a mechanism distinct from that of WBB6F1-W/Wv mice. These findings may have implications for understanding the nature of the mast cell deficiency in WBB6F1-W/Wv and WCB6F1-Sl/Sld mice and for the use of these mutants to analyze mast cell differentiation and function. 相似文献
98.
99.
100.