全文获取类型
收费全文 | 1754篇 |
免费 | 153篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 23篇 |
儿科学 | 64篇 |
妇产科学 | 24篇 |
基础医学 | 223篇 |
口腔科学 | 25篇 |
临床医学 | 133篇 |
内科学 | 399篇 |
皮肤病学 | 22篇 |
神经病学 | 77篇 |
特种医学 | 152篇 |
外科学 | 280篇 |
综合类 | 138篇 |
预防医学 | 66篇 |
眼科学 | 98篇 |
药学 | 95篇 |
中国医学 | 1篇 |
肿瘤学 | 107篇 |
出版年
2023年 | 10篇 |
2022年 | 15篇 |
2021年 | 33篇 |
2020年 | 21篇 |
2019年 | 27篇 |
2018年 | 43篇 |
2017年 | 24篇 |
2016年 | 28篇 |
2015年 | 43篇 |
2014年 | 58篇 |
2013年 | 56篇 |
2012年 | 106篇 |
2011年 | 115篇 |
2010年 | 81篇 |
2009年 | 77篇 |
2008年 | 87篇 |
2007年 | 84篇 |
2006年 | 66篇 |
2005年 | 64篇 |
2004年 | 68篇 |
2003年 | 61篇 |
2002年 | 46篇 |
2001年 | 48篇 |
2000年 | 46篇 |
1999年 | 50篇 |
1998年 | 62篇 |
1997年 | 52篇 |
1996年 | 41篇 |
1995年 | 29篇 |
1994年 | 37篇 |
1993年 | 33篇 |
1992年 | 34篇 |
1991年 | 22篇 |
1990年 | 22篇 |
1989年 | 33篇 |
1988年 | 28篇 |
1987年 | 38篇 |
1986年 | 17篇 |
1985年 | 19篇 |
1984年 | 9篇 |
1983年 | 11篇 |
1982年 | 20篇 |
1981年 | 11篇 |
1980年 | 8篇 |
1978年 | 8篇 |
1977年 | 4篇 |
1976年 | 9篇 |
1975年 | 8篇 |
1973年 | 3篇 |
1967年 | 2篇 |
排序方式: 共有1927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.
Coronary artery bypass grafts: visualization with MR imaging 总被引:1,自引:0,他引:1
4.
5.
Acute angle closure glaucoma generally occurs in older hypermetropic individuals, precipitated by pupillary dilation. However it is often forgotten that it can occur in younger people and that it does not occur solely as a result of the use of mydriatics or normal pupillary dilation in response to darkness. It is recognised that it can occur during or shortly after a surgical procedure done under either spinal or general anaesthetic. We describe a case of acute angle closure occurring in a 37-year-old woman, precipitated by labour. To our knowledge no such case has been described in the literature. 相似文献
6.
7.
8.
Rectal diazepam in the treatment of absence status: a pharmacodynamic study 总被引:7,自引:1,他引:6
下载免费PDF全文
![点击此处可从《Journal of neurology, neurosurgery, and psychiatry》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Norman Milligan Soraya Dhillon Alan Richens Jolyon Oxley 《Journal of neurology, neurosurgery, and psychiatry》1981,44(10):914-917
Rectal administration of diazepam is highly effective in terminating absence status as judged by reduction of spike-wave activity in the EEG. Pharmacokinetic studies indicate that diazepam can have antiepileptic properties at serum levels well below those previously reported as being necessary to achieve a therapeutic effect. 相似文献
9.
10.
Phagocyte function and cytokine production in community acquired pneumonia. 总被引:8,自引:3,他引:5
下载免费PDF全文
![点击此处可从《Thorax》网站下载免费的PDF全文](/ch/ext_images/free.gif)
K Moussa H J Michie I A Cree A C McCafferty J H Winter D P Dhillon S Stephens R A Brown 《Thorax》1994,49(2):107-111
BACKGROUND--It is possible that many deaths from pneumonia may involve the generation of inflammatory mediators and tissue damage by activated phagocytes. To test this hypothesis phagocyte function, plasma levels of interleukin 6 (IL-6), tumour necrosis factor alpha (TNF alpha), and soluble interleukin 2 receptor (IL-2R), disease severity, and outcome have been examined in 46 patients with community acquired pneumonia. METHODS--Polymorphonuclear leucocyte (PMNL) and monocyte function were measured daily by chemiluminescence in these patients during the first week of admission, and cytokine levels were subsequently determined by ELISA. A series of 61 healthy individuals were used as a control group for the chemiluminescence results. RESULTS--There was evidence of phagocyte, particularly PMNL, activation on admission in 76% of the patients. Most patients (86%) also had raised IL-2R levels on admission. IL-6 and unbound TNF alpha were present in 23% and 41% of patients at varying times during the course of the disease. There was little correlation between measurements of cytokine or phagocyte levels and outcome or indicators of disease severity, although this may be because of the small number of patients included in this preliminary study. CONCLUSIONS--These results are consistent with the hypothesis that activated phagocyte function and raised levels of circulating cytokines may contribute to the pathogenesis of community acquired pneumonia. There are striking similarities in this respect between pneumonia, adult respiratory distress syndrome, and sepsis. 相似文献