全文获取类型
收费全文 | 2375篇 |
免费 | 229篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 25篇 |
儿科学 | 140篇 |
妇产科学 | 22篇 |
基础医学 | 220篇 |
口腔科学 | 14篇 |
临床医学 | 195篇 |
内科学 | 514篇 |
皮肤病学 | 49篇 |
神经病学 | 166篇 |
特种医学 | 144篇 |
外科学 | 385篇 |
综合类 | 145篇 |
一般理论 | 2篇 |
预防医学 | 182篇 |
眼科学 | 8篇 |
药学 | 283篇 |
中国医学 | 2篇 |
肿瘤学 | 127篇 |
出版年
2021年 | 18篇 |
2019年 | 29篇 |
2018年 | 27篇 |
2017年 | 26篇 |
2016年 | 36篇 |
2015年 | 35篇 |
2014年 | 64篇 |
2013年 | 62篇 |
2012年 | 102篇 |
2011年 | 75篇 |
2010年 | 74篇 |
2009年 | 65篇 |
2008年 | 109篇 |
2007年 | 100篇 |
2006年 | 86篇 |
2005年 | 100篇 |
2004年 | 96篇 |
2003年 | 91篇 |
2002年 | 64篇 |
2001年 | 78篇 |
2000年 | 66篇 |
1999年 | 58篇 |
1998年 | 72篇 |
1997年 | 53篇 |
1996年 | 45篇 |
1995年 | 34篇 |
1994年 | 39篇 |
1993年 | 34篇 |
1992年 | 52篇 |
1991年 | 61篇 |
1990年 | 58篇 |
1989年 | 53篇 |
1988年 | 48篇 |
1987年 | 66篇 |
1986年 | 35篇 |
1985年 | 43篇 |
1984年 | 33篇 |
1983年 | 32篇 |
1982年 | 28篇 |
1981年 | 16篇 |
1980年 | 23篇 |
1979年 | 21篇 |
1978年 | 26篇 |
1977年 | 19篇 |
1976年 | 27篇 |
1975年 | 20篇 |
1974年 | 36篇 |
1969年 | 21篇 |
1968年 | 21篇 |
1967年 | 17篇 |
排序方式: 共有2623条查询结果,搜索用时 15 毫秒
1.
Akira Sawaki Nobumasa Mizuno Kuniyuki Takahashi Tsuneya Nakamura Masahiro Tajika Hiroki Kawai Toshifumi Isaka Hiroshi Imaoka Yasuyuki Okamoto Masatoshi Aoki Hiroyuki Inoue Ahmed AS Salem Yasushi Yatabe Kenji Yamao 《Digestive endoscopy》2006,18(1):40-44
Background: Gastrointestinal stromal tumors (GIST) are one of the most common mesenchymal tumors of the gastrointestinal tract. GIST are defined by positive immunohistochemical staining for KIT or CD34 and thus are generally diagnosed after surgery. Because small GIST are rarely diagnosed before surgery, the clinical course of these small tumors is not clear. The aim of the present study was to follow changes in size and configuration of small GIST that were pathologically confirmed using endoscopic ultrasonography‐guided fine‐needle aspiration biopsy (EUS‐FNAB). Methods: Between July 1997 and December 2003, 16 tumors in 16 patients (10 men and 6 women) with an immunohistochemical diagnosis of GIST were regularly followed in our hospital. The median patient age when EUS‐FNAB was performed was 62 years (range 26–82 years) and the median follow‐up period was 4.9 years (range 0.5–9.6 years). Results: Fourteen tumors showed no remarkable changes in size and shape during follow up compared with the initial diagnosis. Two tumors enlarged: one tumor approximately doubled its diameter in 8 years and the other tumor increased from 1.8 cm at diagnosis to up to 10 cm after only 2 years. Doubling time of the latter tumor was calculated as 3.1 months. Conclusions: We conclude that EUS‐FNAB might be a good modality for final diagnosis of GIST without surgery, and that GIST without rapid growth on follow up can be endoscopically followed. 相似文献
2.
3.
4.
Coronary artery bypass grafts: visualization with MR imaging 总被引:1,自引:0,他引:1
5.
6.
Deformity and disability from treated clubfoot 总被引:5,自引:0,他引:5
To identify disability associated with treated unilateral, idiopathic clubfoot deformity, 29 patients and 23 controls were compared by morphometry, radiography, and performance testing. The average period following definitive treatment was greater than 10 years. Treatment regimens varied from prolonged casting to early posteromedial release. The most significant limitations in these treated clubfeet averaged (a) a 42% decrease in normal ankle motion, specifically lacking 65% of normal dorsiflexion, a consistent finding independent of treatment; (b) a 24% decrease in normal plantarflexor muscle strength, correlating directly to the number of heelcord lengthenings per foot; and (c) a noticeable 10% decrease in calf girth, unrelated to total time spent in cast. 相似文献
7.
8.
9.
J. Aronson X. C. Shen R. A. Skinner W. R. Hogue T. M. Badger C. K. Lumpkin 《Journal of orthopaedic research》1997,15(2):221-226
Prior studies of distraction osteogenesis in dog and rabbit models have shown predominantly intramembranous bone formation. Other models of fracture healing normally display mixtures of both endochondral and intramembranous bone formation. We have established a rat model of tibial lengthening that reliably reproduces the pattern of zonal osteogenesis previously observed in dog and rabbit models. A distraction rate of 0.25 mm twice a day with a 0-day latency period produced intramembranous bone with zones of progressive mineralization from collagen. With this protocol, rats bridged the distraction gap with a 25% increase in the tibial bone length. After 20 days of distraction and 50 days of consolidation, the three-point bending stiffness, as a percentage of the contralateral control, reached a level equivalent to that measured in the canine model for a 15% lengthening (28-day distraction and 84-day consolidation). Radiodensitometric analysis of the regenerate bones measured 97% of the unaffected contralateral tibial densities, and mineral analyses demonstrated that calcium and phosphorus levels in the regenerate bone reached 78% of contralateral tibial levels by day 70. We concluded that a rat model of distraction ostegenesis will be useful for a wide range of studies involving rapid intramembranous bone formation. 相似文献
10.