全文获取类型
收费全文 | 559篇 |
免费 | 40篇 |
国内免费 | 21篇 |
专业分类
儿科学 | 29篇 |
妇产科学 | 10篇 |
基础医学 | 70篇 |
口腔科学 | 23篇 |
临床医学 | 69篇 |
内科学 | 83篇 |
皮肤病学 | 15篇 |
神经病学 | 29篇 |
特种医学 | 82篇 |
外科学 | 53篇 |
综合类 | 30篇 |
预防医学 | 22篇 |
眼科学 | 17篇 |
药学 | 25篇 |
中国医学 | 20篇 |
肿瘤学 | 43篇 |
出版年
2024年 | 4篇 |
2023年 | 9篇 |
2022年 | 18篇 |
2021年 | 38篇 |
2020年 | 13篇 |
2019年 | 10篇 |
2018年 | 15篇 |
2017年 | 6篇 |
2016年 | 11篇 |
2015年 | 11篇 |
2014年 | 23篇 |
2013年 | 29篇 |
2012年 | 6篇 |
2011年 | 21篇 |
2010年 | 39篇 |
2009年 | 28篇 |
2008年 | 11篇 |
2007年 | 22篇 |
2006年 | 18篇 |
2005年 | 11篇 |
2004年 | 7篇 |
2003年 | 4篇 |
2002年 | 9篇 |
2001年 | 12篇 |
2000年 | 7篇 |
1999年 | 9篇 |
1998年 | 36篇 |
1997年 | 26篇 |
1996年 | 17篇 |
1995年 | 13篇 |
1994年 | 12篇 |
1993年 | 9篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 9篇 |
1989年 | 16篇 |
1988年 | 11篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 7篇 |
1984年 | 6篇 |
1982年 | 7篇 |
1981年 | 3篇 |
1980年 | 9篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1976年 | 2篇 |
1958年 | 2篇 |
1954年 | 2篇 |
1949年 | 2篇 |
排序方式: 共有620条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
85.
86.
87.
88.
B Lönnerdal N Zavaleta L Kusunoki CF Lanata JM Peerson KH Brown 《Acta paediatrica (Oslo, Norway : 1992)》1996,85(5):537-542
In developing countries, maternal infections during lactation are common. In this study, we evaluated the effect of acute maternal postpartum infection on the composition of colostrum and early milk with special emphasis on milk proteins and trace elements. The study was carried out in two maternity hospitals in Lima, Peru. Subjects were normally nourished women (body mass index (BMI) > 20.0) who intended to exclusively breastfeed their child and who had fever and clinical symptoms of infection within the first 48 h postpartum ( n = 34). Non-ill women of similar characteristics were selected as controls ( n = 23). Blood and milk samples were taken on days 1 and 14 postpartum. An acute phase response was confirmed by significantly increased serum levels of C-reactive protein in infected women. Serum zinc levels increased significantly from day 1 to day 14, but were not affected by infection. Serum copper levels were significantly higher in ill women than in non-ill women on day 1. All participating women were breastfeeding on day 14. Whey protein levels, the whey/casein ratio and total protein levels decreased significantly with time, but were not affected by infection. There were no differences in milk iron or copper levels with time or infection. Milk zinc levels decreased significantly with time, but were not affected by infection. Maternal infection during the early postpartum period does not appear to adversely affect the initiation of lactation or milk protein and trace element contents. 相似文献
89.
90.
Lissencephaly is a rare congenital malformation of the brain that has characteristic clinical and radiographic findings. Thirteen cases of lissencephaly were studied clinically and radiographically with computed tomography and magnetic resonance imaging. A classification was developed based on the findings in these cases and the literature. The clinical and radiographic evaluation of lissencephaly is emphasized, with a thorough discussion of the clinical spectrum of each type, radiographic findings, prognosis, survival, and associated genetic abnormalities. 相似文献