全文获取类型
收费全文 | 1310篇 |
免费 | 43篇 |
国内免费 | 147篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 58篇 |
妇产科学 | 8篇 |
基础医学 | 96篇 |
口腔科学 | 80篇 |
临床医学 | 183篇 |
内科学 | 296篇 |
皮肤病学 | 29篇 |
神经病学 | 22篇 |
特种医学 | 322篇 |
外科学 | 146篇 |
综合类 | 25篇 |
预防医学 | 44篇 |
眼科学 | 14篇 |
药学 | 119篇 |
1篇 | |
肿瘤学 | 55篇 |
出版年
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 6篇 |
2018年 | 15篇 |
2017年 | 7篇 |
2016年 | 11篇 |
2015年 | 12篇 |
2014年 | 15篇 |
2013年 | 34篇 |
2012年 | 20篇 |
2011年 | 26篇 |
2010年 | 34篇 |
2009年 | 44篇 |
2008年 | 32篇 |
2007年 | 114篇 |
2006年 | 24篇 |
2005年 | 44篇 |
2004年 | 21篇 |
2003年 | 12篇 |
2002年 | 25篇 |
2001年 | 26篇 |
2000年 | 21篇 |
1999年 | 28篇 |
1998年 | 83篇 |
1997年 | 81篇 |
1996年 | 74篇 |
1995年 | 63篇 |
1994年 | 47篇 |
1993年 | 54篇 |
1992年 | 27篇 |
1991年 | 47篇 |
1990年 | 33篇 |
1989年 | 65篇 |
1988年 | 45篇 |
1987年 | 41篇 |
1986年 | 32篇 |
1985年 | 27篇 |
1984年 | 20篇 |
1983年 | 15篇 |
1982年 | 29篇 |
1981年 | 15篇 |
1980年 | 15篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 17篇 |
1976年 | 29篇 |
1975年 | 16篇 |
1974年 | 5篇 |
1970年 | 3篇 |
1908年 | 5篇 |
排序方式: 共有1500条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Adverse reaction to intravenous gadoteridol 总被引:1,自引:0,他引:1
6.
The purpose of this investigation was to determine whether a difference exists in four digital image features, extracted from standardized periapical radiographs of the maxillary alveolar bone, between younger and older women. These features included mean pixel intensity, I(x); pixel intensity variance, var I(x); mean absolute Fourier transform coefficient, magnitude of F(u); and mean spatial first moment of the absolute Fourier coefficients, M1. The interproximal bone between the maxillary canine and lateral incisor was analyzed in two groups of 10 younger and older women with mean ages of 24 and 74 years, respectively. I(x) was significantly less in the 70-year-old group than in the 20-year-old group (p = 0.01), as were magnitude of F(u) (p less than 0.05) and M1 (p less than 0.01). Var I(x) tended to be significantly less in the 70-year-old group (p = 0.06). We conclude that in women a measurable diminution in the magnitude of these four bony features comes with age. 相似文献
7.
8.
9.
An analysis of the components in UW solution using the isolated perfused rabbit liver 总被引:11,自引:0,他引:11
The isolated perfused rabbit liver model has been used to determine the essential components of the UW solution for hepatic preservation by simple cold storage. Livers were stored on ice for 48 hr after initial flushing with the solution being tested, and then reperfused at 38 degrees C in an isolated perfusion circuit; bile flow and enzyme (SGOT, SGPT, and LDH) release during a 2-hr period were recorded. All solutions tested contained phosphate (25 mM) as a buffer and magnesium sulfate (5 mM). Sodium can be substituted for potassium without adverse effects. Lactobionate, raffinose and glutathione cannot be omitted; all other components can be eliminated without altering the effectiveness of the solution in this model. 相似文献
10.