全文获取类型
收费全文 | 851篇 |
免费 | 66篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 53篇 |
妇产科学 | 9篇 |
基础医学 | 87篇 |
口腔科学 | 9篇 |
临床医学 | 75篇 |
内科学 | 189篇 |
皮肤病学 | 7篇 |
神经病学 | 23篇 |
特种医学 | 237篇 |
外科学 | 84篇 |
综合类 | 39篇 |
一般理论 | 1篇 |
预防医学 | 42篇 |
眼科学 | 8篇 |
药学 | 24篇 |
中国医学 | 1篇 |
肿瘤学 | 48篇 |
出版年
2021年 | 9篇 |
2020年 | 8篇 |
2018年 | 7篇 |
2017年 | 6篇 |
2016年 | 10篇 |
2015年 | 11篇 |
2014年 | 9篇 |
2013年 | 18篇 |
2012年 | 10篇 |
2011年 | 19篇 |
2010年 | 23篇 |
2009年 | 35篇 |
2008年 | 21篇 |
2007年 | 24篇 |
2006年 | 24篇 |
2005年 | 24篇 |
2004年 | 20篇 |
2003年 | 26篇 |
2002年 | 17篇 |
2001年 | 13篇 |
2000年 | 9篇 |
1999年 | 17篇 |
1998年 | 51篇 |
1997年 | 50篇 |
1996年 | 39篇 |
1995年 | 24篇 |
1994年 | 42篇 |
1993年 | 27篇 |
1992年 | 20篇 |
1991年 | 18篇 |
1990年 | 17篇 |
1989年 | 37篇 |
1988年 | 26篇 |
1987年 | 21篇 |
1986年 | 29篇 |
1985年 | 15篇 |
1984年 | 19篇 |
1983年 | 18篇 |
1982年 | 13篇 |
1981年 | 24篇 |
1980年 | 6篇 |
1979年 | 6篇 |
1978年 | 11篇 |
1977年 | 12篇 |
1976年 | 14篇 |
1975年 | 11篇 |
1971年 | 4篇 |
1970年 | 6篇 |
1968年 | 4篇 |
1964年 | 2篇 |
排序方式: 共有938条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
5.
6.
J G Byrne R F Appleyard C C Lee G S Couper F G Scholl R G Laurence L H Cohn 《The Journal of thoracic and cardiovascular surgery》1992,103(1):66-71; discussion 71-2
Open-chest sheep underwent 90 minutes' occlusion of the diagonal branch of the left anterior descending coronary artery, followed by vented cardiopulmonary bypass. After 30 minutes of cardioplegic arrest, simulating distal anastomoses, the occlusion on the coronary artery branch was released. Controlled reperfusion (40 to 50 mm Hg, 135 to 150 ml/min) for the first 20 minutes was delivered at the aortic root with either unmodified whole blood (control, n = 7) or blood passed through leukocyte filters (filters, n = 7). Serial measurements were made during 3 additional hours reperfusion off cardiopulmonary bypass. During ischemia, the major determinants of infarct size, which include area at risk, collateral myocardial blood flow, and rate-pressure product were not significantly different between groups. Overall, during reperfusion, mean left ventricular stroke work index in the filter group was greater than in the control group (28.7 +/- 5.8 versus 12.6 +/- 6.4 x 10(3) erg/gm, p less than 0.05), as was mean rate of rise of left ventricular pressure (1900 +/- 260 versus 1348 +/- 279 mm Hg/sec, p less than 0.05). Myocardial blood flow to the area at risk at 3 1/2 hours of reperfusion in the filter group was also significantly better than in the control group (0.57 +/- 0.15 versus 0.27 +/- 0.05 ml/min/gm, p less than 0.05), as was necrotic area as a percentage of area at risk (40% +/- 6% versus 70% +/- 5%, p less than 0.05). These results demonstrate amelioration of myocardial stunning and the no-reflow phenomenon, as well as decreased infarct size. We conclude that controlled reperfusion with leukocyte-depleted blood is superior to whole-blood reperfusion for the surgical treatment of acute regional ischemia. 相似文献
7.
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
8.
9.
Quantitative study of the immunoglobulin-containing cells in trephine samples of bone marrow 下载免费PDF全文
Immunoglobulin (Ig) was demonstrated in paraffin sections of 12 trephine bone marrow biopsies by means of the unlabelled antibody peroxidase-antiperoxidase (PAP) method. The Ig-containing cells, which were counted with the Reichert-Jung (Kontron) MOP-AMO3 user-controlled image-analyser, were found to constitute approximately 4·2% of all the nucleated cells in the marrow, a figure significantly higher than those reported by previous workers. 相似文献
10.
Laura A Hawryluck William RC Harvey Louise Lemieux-Charles Peter A Singer 《BMC medical ethics》2002,3(1):3-9