全文获取类型
收费全文 | 906篇 |
免费 | 66篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 14篇 |
儿科学 | 40篇 |
妇产科学 | 14篇 |
基础医学 | 149篇 |
口腔科学 | 9篇 |
临床医学 | 77篇 |
内科学 | 215篇 |
皮肤病学 | 19篇 |
神经病学 | 27篇 |
特种医学 | 41篇 |
外科学 | 228篇 |
综合类 | 15篇 |
预防医学 | 43篇 |
眼科学 | 5篇 |
药学 | 28篇 |
肿瘤学 | 52篇 |
出版年
2022年 | 7篇 |
2021年 | 15篇 |
2020年 | 12篇 |
2019年 | 17篇 |
2018年 | 35篇 |
2017年 | 7篇 |
2016年 | 12篇 |
2015年 | 20篇 |
2014年 | 24篇 |
2013年 | 33篇 |
2012年 | 37篇 |
2011年 | 48篇 |
2010年 | 29篇 |
2009年 | 26篇 |
2008年 | 29篇 |
2007年 | 30篇 |
2006年 | 39篇 |
2005年 | 38篇 |
2004年 | 46篇 |
2003年 | 48篇 |
2002年 | 31篇 |
2001年 | 28篇 |
2000年 | 20篇 |
1999年 | 23篇 |
1998年 | 16篇 |
1997年 | 21篇 |
1996年 | 12篇 |
1995年 | 11篇 |
1994年 | 14篇 |
1993年 | 13篇 |
1992年 | 23篇 |
1991年 | 14篇 |
1990年 | 10篇 |
1989年 | 13篇 |
1988年 | 12篇 |
1987年 | 9篇 |
1986年 | 15篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 9篇 |
1982年 | 6篇 |
1981年 | 9篇 |
1979年 | 16篇 |
1977年 | 7篇 |
1976年 | 6篇 |
1975年 | 6篇 |
1974年 | 8篇 |
1971年 | 8篇 |
1969年 | 7篇 |
1968年 | 5篇 |
排序方式: 共有976条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
P. R. Schauer W. H. Schwesinger C. P. Page R. M. Stewart B. A. Levine K. R. Sirinek 《Surgical endoscopy》1997,11(1):8-11
Background: This study examines the notion that gastrointestinal endoscopy performed by supervised surgical residents is safe.
Methods: We reviewed all gastrointestinal endoscopic procedures performed by surgical residents with faculty supervision for complications
and deaths occurring up to 30 days following the procedures.
Results: The overall complication rate for 9,201 upper and lower endoscopy procedures was 1.4% and 0.42%, respectively. Overall mortality
rate was 0.76% for upper endoscopy and 0.6% for lower endoscopy. No mortality was a direct result of a procedure-related complication.
Intestinal perforation, drug overdose, bleeding, and aspiration were the most common procedure-related complications. Each
resident completed an average of 75 upper endoscopies and 79 lower endoscopies during their training period.
Conclusions: Gastrointestinal endoscopy can be performed safely by surgical residents with appropriate supervision. The higher morbidity
and mortality of upper endoscopy are most likely related to the underlying disease rather than the procedure. Awareness of
common complications and application of appropriate precautions and instruction are critical for minimizing complications.
Received 25 March 1996/Accepted: 24 April 1996 相似文献
7.
8.
K A Pearce A H Schauer N J Garfield C O Ohlde T W Patterson 《Journal of clinical psychology》1985,41(1):9-14
Three groups of Vietnam-era veterans were compared on the frequency of symptoms typical of the diagnostic criteria for Post Traumatic Stress Disorder (PTSD), a diagnostic category introduced in DSM III (N = 90). The three groups consisted of veterans who had experienced (a) a war-related traumatic event; (b) a non-war-related traumatic event; or (c) no traumatic event. The results indicated that the two groups who experienced a traumatic event reported significantly more symptoms than the group who never experienced a traumatic event. Furthermore, the group who experienced a war-related traumatic event reported more symptoms than the group who experienced a non-war-related traumatic event. These results support the validity of PTSD. 相似文献
9.
Intimin from enteropathogenic Escherichia coli restores murine virulence to a Citrobacter rodentium eaeA mutant: induction of an immunoglobulin A response to intimin and EspB.
下载免费PDF全文
![点击此处可从《Infection and immunity》网站下载免费的PDF全文](/ch/ext_images/free.gif)
G Frankel A D Phillips M Novakova H Field D C Candy D B Schauer G Douce G Dougan 《Infection and immunity》1996,64(12):5315-5325
The formation of attaching and effacing (A/E) lesions is central to the pathogenesis of enteropathogenic Escherichia coli (EPEC)-mediated disease in humans and Citrobacter rodentium (formerly C. freundii biotype 4280)-mediated transmissible colonic hyperplasia in mice. Closely related outer membrane proteins, known as intimins, are required for formation of the A/E lesion by both EPEC (Int(EPEC)) and C. rodentium (Int(CR)). A secreted protein, EspB (formally EaeB), is also necessary for A/E-lesion formation. Here we report that expression of a cloned Int(EPEC), encoded by plasmid pCVD438, restores murine virulence to an intimin-deficient mutant of C. rodentium DBS255. Replacement of Cys937 with Ala abolished the ability of the cloned EPEC intimin to complement the deletion mutation in DBS255. Ultrastructural examination of tissues from wild-type C. rodentium and DBS255(pCVD438)-infected mice revealed multiple A/E lesion on infected cells and loss of contact between enterocytes and basement membrane. Histological investigation showed that although both wild-type C. rodentium and DBS255(pCVD438) colonized the descending colon and induced colonic hyperplasia in orally infected 21-day-old mice, the latter strain adhered to epithelial cells located deeper within crypts. Nonetheless, infection with the wild-type strain was consistently more virulent, as indicated by a higher mortality rate. All the surviving mice, challenged with either wild-type C. rodentium or DBS255(pCVD438), developed a mucosal immunoglobulin A response to intimin and EspB. These results show that C. rodentium infection provides a relevant, simple, and economic model to investigate the role of EPEC proteins in the formation of A/E lesions in vivo and in intestinal disease. 相似文献
10.
Sass DA Chopra KB Finkelstein SD Schauer PR 《Archives of pathology & laboratory medicine》2004,128(2):214-217
In cases of obscure gastrointestinal bleeding, when a source for blood loss is not apparent from examination of the colon and upper gastrointestinal tract, the small bowel usually becomes the focus of investigation. A tumor with interesting pathologic features was found in a patient who presented with recurrent episodes of massive obscure gastrointestinal hemorrhage. This case highlights the importance of considering small intestinal tumors as the likely cause of obscure gastrointestinal hemorrhage in young patients and how a noninvasive test, eg, abdominal computed tomography scan, might obviate the need for more invasive testing. 相似文献