全文获取类型
收费全文 | 669篇 |
免费 | 27篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 50篇 |
妇产科学 | 13篇 |
基础医学 | 62篇 |
口腔科学 | 32篇 |
临床医学 | 50篇 |
内科学 | 203篇 |
皮肤病学 | 16篇 |
神经病学 | 14篇 |
特种医学 | 154篇 |
外科学 | 25篇 |
综合类 | 12篇 |
预防医学 | 24篇 |
眼科学 | 3篇 |
药学 | 24篇 |
中国医学 | 1篇 |
肿瘤学 | 17篇 |
出版年
2024年 | 1篇 |
2022年 | 1篇 |
2021年 | 11篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2018年 | 11篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 11篇 |
2014年 | 23篇 |
2013年 | 19篇 |
2012年 | 10篇 |
2011年 | 22篇 |
2010年 | 33篇 |
2009年 | 35篇 |
2008年 | 35篇 |
2007年 | 22篇 |
2006年 | 15篇 |
2005年 | 15篇 |
2004年 | 13篇 |
2003年 | 15篇 |
2002年 | 4篇 |
2001年 | 9篇 |
2000年 | 10篇 |
1999年 | 13篇 |
1998年 | 28篇 |
1997年 | 38篇 |
1996年 | 48篇 |
1995年 | 31篇 |
1994年 | 25篇 |
1993年 | 36篇 |
1992年 | 1篇 |
1991年 | 4篇 |
1990年 | 12篇 |
1989年 | 10篇 |
1988年 | 12篇 |
1987年 | 18篇 |
1986年 | 21篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 4篇 |
1982年 | 18篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 1篇 |
1977年 | 9篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1971年 | 1篇 |
排序方式: 共有702条查询结果,搜索用时 0 毫秒
701.
Background
Obesity in pregnancy is a global health problem which is associated with poor pregnancy outcomes. The use of weight and height, measured at about ten weeks of gestation, to produce pre-gestational body mass index is recommended for the diagnoses of the condition but limitations abound in under resourced settings.Objectives
To measure anthropometric indices such as mid upper arm circumference, calf circumference, waist circumference and waist to hip ratio, for identification of obesity in pregnancy.Methods
Anthropometric measurements were carried out on cohorts of pregnant women from 4 hospitals in Enugu, South-eastern Nigeria.Results
There were no significant difference in the mean mid upper arm circumference (MUAC) and calf circumference (CC) across the trimester groups. The mean values of waist circumferences, hip circumference and waist to hip ratios changed significantly across the trimesters. The 75th percentile of MUAC (33 cm) and CC (39 cm) in all trimesters, had sensitivity and specificity of more than 70% for identifying obesity in pregnancy.Conclusion
MUAC and CC values of 33cm and 39cm respectively might be reliable cut off points for diagnoses of obesity throughout pregnancy in Enugu, Nigeria 相似文献702.
Hitoshi Izuha CE Momoe Hattori CE Tsuguo Igari MD Daiki Wakamatsu MD MDToshiki Watanabe MD Hitoshi Yokoyama MD 《Journal of artificial organs》2005,8(1):41-46
At present, there are various biomaterials that have high biocompatibility. In particular, there are many types of coated circuits in cardiopulmonary bypass (CPB) systems. However, only a few clinical studies have investigated platelet aggregation caused by these coated circuits. In this study, a CPB system coated with poly-2-methoxyethylacrylate (X coating) was used to ascertain whether platelet aggregation could be suppressed during CPB, and a comparison was made between X coating and ordinary (covalently bonded) heparin coating. The subjects were 19 adult patients who were scheduled to undergo valve replacement or valvuloplasty. They were divided into two groups: group X (X coating) and group H (heparin coating). The platelet aggregation threshold index (PATI, grading curve) and β-thromboglobulin and plalelet factor IV levels were assessed preoperatively (control), 5 min after heparin administration, 10 and 60 min after the start of CPB, and 0 and 2 h after the end of CPB. The results indicated that platelet aggregation was reduced during CPB and that platelets were activated. The changes in platelet aggregation associated with the X coating were shown to be similar to those associated with heparin coating. 相似文献