全文获取类型
收费全文 | 8331篇 |
免费 | 891篇 |
国内免费 | 109篇 |
专业分类
耳鼻咽喉 | 74篇 |
儿科学 | 216篇 |
妇产科学 | 133篇 |
基础医学 | 1159篇 |
口腔科学 | 318篇 |
临床医学 | 1037篇 |
内科学 | 1680篇 |
皮肤病学 | 108篇 |
神经病学 | 607篇 |
特种医学 | 302篇 |
外科学 | 1223篇 |
综合类 | 245篇 |
一般理论 | 6篇 |
预防医学 | 818篇 |
眼科学 | 199篇 |
药学 | 684篇 |
中国医学 | 2篇 |
肿瘤学 | 520篇 |
出版年
2021年 | 92篇 |
2020年 | 61篇 |
2019年 | 105篇 |
2018年 | 123篇 |
2017年 | 128篇 |
2016年 | 128篇 |
2015年 | 142篇 |
2014年 | 138篇 |
2013年 | 255篇 |
2012年 | 359篇 |
2011年 | 391篇 |
2010年 | 245篇 |
2009年 | 212篇 |
2008年 | 314篇 |
2007年 | 406篇 |
2006年 | 353篇 |
2005年 | 397篇 |
2004年 | 310篇 |
2003年 | 359篇 |
2002年 | 317篇 |
2001年 | 255篇 |
2000年 | 291篇 |
1999年 | 240篇 |
1998年 | 136篇 |
1997年 | 137篇 |
1996年 | 124篇 |
1995年 | 105篇 |
1994年 | 120篇 |
1993年 | 97篇 |
1992年 | 204篇 |
1991年 | 177篇 |
1990年 | 173篇 |
1989年 | 176篇 |
1988年 | 169篇 |
1987年 | 166篇 |
1986年 | 150篇 |
1985年 | 163篇 |
1984年 | 117篇 |
1983年 | 105篇 |
1982年 | 76篇 |
1981年 | 75篇 |
1980年 | 62篇 |
1979年 | 111篇 |
1978年 | 70篇 |
1977年 | 78篇 |
1976年 | 64篇 |
1973年 | 85篇 |
1972年 | 74篇 |
1971年 | 74篇 |
1970年 | 61篇 |
排序方式: 共有9331条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
35.
Posterior chamber intraocular lenses in a series of 75 autopsy eyes. Part I: Loop location 总被引:1,自引:0,他引:1
D J Apple S B Park K H Merkley R N Brems S C Richards K E Langley K L Piest R A Isenberg 《Journal of cataract and refractive surgery》1986,12(4):358-362
Over a period of 27 months, November 1983 to February 1986, 75 eyes obtained postmortem with posterior chamber intraocular lenses (IOLs) were examined at the Center for Intraocular Lens Research, University of Utah Health Sciences Center. These IOLs were studied by histopathological techniques to determine the location of the loops. The most common combination, found in 47% of the specimens, was one loop in the lens capsular sac (bag) and one loop in the ciliary sulcus. In 32% of the specimens, both loops were in the capsular sac; in 17%, both loops were in the ciliary sulcus. Compared to results observed in other autopsy studies, in which capsular fixation was documented in less than 3% of cases, these findings reflect a trend toward capsular sac (in-the-bag) implantation of open-looped posterior chamber IOLs. 相似文献
36.
37.
The spleen, whether anatomically and physiologically normal or diseased, may significantly worsen the clinical picture in a variety of medical disorders. However, splenectomy should be undertaken only after a careful balancing of the short- and long-term risks and potential benefits to the patient, which are discussed in the following review. 相似文献
38.
39.
40.
Summary Sodium fluoride 10, 20, or 40 mg/kg body weight was given intraperitoneally to rats (6–11 days old and 90–95 days old). Blood
analyses showed an initial increase in plasma fluoride concentration. The subsequent decrease in fluoride was paralleled by
a decrease in total plasma calcium. These plasma concentrations were normal at blood collection 4 days after fluoride injection.
The baby rats differed from the older rats in that their initial plasma calcium was higher and that the drop in plasma calcium
concentration was less pronounced than in the old rats. A diet low in calcium and phosphate enhanced the effects of fluoride
on total plasma calcium. The data indicate that the effect of large doses of fluoride on lowering the plasma calcium level
is modified by the calcium intake. 相似文献