全文获取类型
收费全文 | 2069篇 |
免费 | 120篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 69篇 |
妇产科学 | 71篇 |
基础医学 | 173篇 |
口腔科学 | 58篇 |
临床医学 | 161篇 |
内科学 | 560篇 |
皮肤病学 | 30篇 |
神经病学 | 96篇 |
特种医学 | 31篇 |
外国民族医学 | 1篇 |
外科学 | 259篇 |
综合类 | 41篇 |
预防医学 | 248篇 |
眼科学 | 88篇 |
药学 | 203篇 |
中国医学 | 9篇 |
肿瘤学 | 87篇 |
出版年
2023年 | 21篇 |
2022年 | 55篇 |
2021年 | 80篇 |
2020年 | 34篇 |
2019年 | 61篇 |
2018年 | 58篇 |
2017年 | 62篇 |
2016年 | 58篇 |
2015年 | 63篇 |
2014年 | 100篇 |
2013年 | 121篇 |
2012年 | 164篇 |
2011年 | 175篇 |
2010年 | 104篇 |
2009年 | 93篇 |
2008年 | 142篇 |
2007年 | 115篇 |
2006年 | 84篇 |
2005年 | 88篇 |
2004年 | 81篇 |
2003年 | 75篇 |
2002年 | 48篇 |
2001年 | 27篇 |
2000年 | 41篇 |
1999年 | 29篇 |
1998年 | 14篇 |
1997年 | 7篇 |
1996年 | 4篇 |
1994年 | 4篇 |
1992年 | 14篇 |
1991年 | 10篇 |
1990年 | 9篇 |
1988年 | 22篇 |
1987年 | 6篇 |
1986年 | 10篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1981年 | 4篇 |
1979年 | 4篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 6篇 |
1975年 | 10篇 |
1974年 | 8篇 |
1973年 | 8篇 |
1972年 | 7篇 |
1969年 | 7篇 |
1968年 | 5篇 |
1967年 | 4篇 |
1966年 | 4篇 |
排序方式: 共有2193条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
7.
Maternal and fetal plasma vitamin E to total lipid ratio and fetal RBC antioxidant function during gestational development 总被引:1,自引:0,他引:1
S Abbasi A Ludomirski V K Bhutani S Weiner L Johnson 《Journal of the American College of Nutrition》1990,9(4):314-319
Placental transfer of vitamin E was investigated from 19 to 35 weeks of gestation by analysis of fetal and maternal blood samples for total tocopherol, total lipids, and fetal red blood cell antioxidant reserves. Fifty-two fetal blood samples were obtained under ultrasonographic guide by percutaneous umbilical blood sampling. Thirteen were from fetuses with gestational age less than or equal to 22 weeks (x serum vitamin E = 0.4 +/- 0.14 mg/dl), 12 were from fetuses at 23-27 weeks gestation (x serum vitamin E = 0.4 +/- 0.21 mg/dl), and 27 were from fetuses with gestational age 28-38 weeks (x serum level = 0.37 +/- 0.18). Total lipid levels ranged from 140 to 216 mg/dl. Maternal plasma vitamin E concentrations correlated significantly with concurrent values in the fetus. There were no significant differences in serum vitamin E levels or vitamin E to total lipid ratio in samples from early, mid, or late gestation in either the mother or fetus. Red blood cell antioxidant reserve on samples from 18 fetuses were grossly abnormal by three different functional assays. On the basis of these data, placental transfer of vitamin E appears to be relatively constant through advancing gestation. Red blood cell antioxidant reserve is uniformly low. 相似文献
8.
9.
Ping L. Zhang Sayeed K. Malek Jeffery W. Prichard Fan Lin Taher M. Yahya Michael S. Schwartzman Ruth P. Latsha Evan R. Norfolk Thomas M. Blasick Mingyue Lun Robert E. Brown James E. Hartle Santosh Potdar 《American journal of transplantation》2005,5(3):604-607
Campath-1H has been used successfully for induction and has resulted in a low rate of acute cellular rejection (ACR) in renal transplantation in combination with various postoperative immunosuppression regimens. This study was undertaken to investigate the extent of monocyte involvement in ACR, with or without Campath-1H induction. We found that monocytes represented the majority of inflammatory cells in grades Ib or higher ACR, but not with Ia type of ACR, regardless of the status of Campath-1H induction. Cases of ACR, following Campath-1H induction, appear to demonstrate a 'pure form' of monocytic ACR, whereas monocytes were mixed with many other types of inflammatory cells in the cases of ACR in the absence of Campath-1H induction. In addition with Campath-1H induction, the cases of monocyte-predominant ACR were found to uniformly exhibit a good response to corticosteroid treatment. We conclude that monocyte-predominate ACR may represent a severe form of rejection, with or without Campath-1H treatment. 相似文献
10.