全文获取类型
收费全文 | 1028篇 |
免费 | 59篇 |
国内免费 | 59篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 54篇 |
妇产科学 | 10篇 |
基础医学 | 84篇 |
口腔科学 | 27篇 |
临床医学 | 170篇 |
内科学 | 254篇 |
皮肤病学 | 18篇 |
神经病学 | 33篇 |
特种医学 | 238篇 |
外科学 | 62篇 |
综合类 | 31篇 |
预防医学 | 46篇 |
眼科学 | 11篇 |
药学 | 72篇 |
中国医学 | 2篇 |
肿瘤学 | 31篇 |
出版年
2022年 | 5篇 |
2021年 | 14篇 |
2019年 | 9篇 |
2018年 | 23篇 |
2017年 | 8篇 |
2015年 | 16篇 |
2014年 | 24篇 |
2013年 | 34篇 |
2012年 | 21篇 |
2011年 | 20篇 |
2010年 | 31篇 |
2009年 | 24篇 |
2008年 | 20篇 |
2007年 | 60篇 |
2006年 | 11篇 |
2005年 | 35篇 |
2004年 | 29篇 |
2003年 | 20篇 |
2002年 | 11篇 |
2001年 | 15篇 |
2000年 | 17篇 |
1999年 | 20篇 |
1998年 | 57篇 |
1997年 | 40篇 |
1996年 | 61篇 |
1995年 | 44篇 |
1994年 | 40篇 |
1993年 | 50篇 |
1992年 | 12篇 |
1991年 | 13篇 |
1990年 | 20篇 |
1989年 | 32篇 |
1988年 | 34篇 |
1987年 | 36篇 |
1986年 | 29篇 |
1985年 | 35篇 |
1984年 | 21篇 |
1983年 | 10篇 |
1982年 | 12篇 |
1981年 | 22篇 |
1980年 | 21篇 |
1979年 | 8篇 |
1978年 | 11篇 |
1977年 | 16篇 |
1976年 | 7篇 |
1975年 | 11篇 |
1974年 | 4篇 |
1973年 | 4篇 |
1970年 | 4篇 |
1968年 | 4篇 |
排序方式: 共有1146条查询结果,搜索用时 31 毫秒
1.
Marie-Louise Gander Roland von K?nel 《European journal of cardiovascular prevention and rehabilitation》2006,13(2):165-172
BACKGROUND: Post-traumatic stress disorder (PTSD) may develop in the aftermath of an acute myocardial infarction (MI). Whether PTSD is a risk factor for cardiovascular disease (CVD) is elusive. The biological mechanisms linking PTSD with atherosclerosis are unclear. DESIGN: A critical review of 31 studies in the English language pursuing three aims: (i) to estimate the prevalence of PTSD in post-MI patients; (ii) to investigate the association of PTSD with cardiovascular endpoints; and (iii) to search for low-grade systemic inflammatory changes in PTSD pertinent to atherosclerosis. METHODS: We located studies by PubMed electronic library search and through checking the bibliographies of these sources. RESULTS: The weighted prevalence of PTSD after MI was 14.7% (range 0-25%; a total of 13 studies and 827 post-MI patients). Two studies reported a prospective association between PTSD and an increased risk of cardiovascular readmission in post-MI patients and of cardiovascular mortality in combat veterans, respectively. In a total of 11 studies, patients with PTSD had increased rates of physician-rated and self-reported cardiovascular diseases. Various cytokines and C-reactive protein were investigated in a total of seven studies suggesting that PTSD confers a pro-inflammatory state. CONCLUSIONS: Increasing evidence suggests that PTSD specifically related to MI develops considerably frequently in post-MI patients. More research is needed in larger cohorts applying a population design to substantiate findings suggesting PTSD is an atherogenic risk factor and to understand better the suspected behavioural and biological mechanisms involved. 相似文献
2.
3.
4.
5.
6.
Short-Ti inversion-recovery pulse sequence: analysis and initial experience in cancer imaging 总被引:2,自引:0,他引:2
Inversion recovery (IR), commonly considered a pulse sequence capable of producing T1-weighted images with excellent display of normal anatomy, is versatile: The null point and peak time provide a useful, succinct summary of the properties of IR and its capacity for producing both T1- and T2-weighted images. Shortening of the inversion time (TI) and creation of a short-TI inversion-recovery (STIR) pulse sequence increases sensitivity to malignancy and other abnormalities by making the effects of prolonged T1 and T2 on signal intensity additive and by nulling the signal from fat. The authors examined over 300 patients with various malignancies and compared STIR images with T1- and T2-weighted images obtained at 0.5 T. In 43 cases, signal-difference-to-noise ratios (SD/Ns) were calculated between tumor, fat, and muscle. In general, STIR images demonstrated tumor as a conspicuously high-intensity area in a background of muted, discernible anatomic detail. The good contrast achieved with STIR sequences between tumor and fat (SD/N = 18.1) and tumor and muscle (SD/N = 12.9) consolidated into a single image the information contained separately on T1- and T2-weighted images, which facilitates efficient detection and localization of malignancy. 相似文献
7.
Sixteen cases of histopathologically proved solitary rectal ulcer syndrome were encountered. Fifteen patients underwent barium enema study; in nine cases the findings--including rectal stricture, granularity of the mucosa, and thickened rectal folds-were nonspecific. In six cases the study was normal. All patients had a long history of defecation disorders, and defecography was performed in all. In seven cases, intussusception of the rectal wall was seen; in another case the intussusception was accompanied by a rectocele. One case showed rectal prolapse. In four cases, failed relaxation of the puborectalis occurred and prevented the passage of the bolus; in another case there was abnormal perineal descent. In two patients studies were normal. In patients with defecation disorders, the possibility of this syndrome should be considered. Defecography is the method of choice for establishing the diagnosis. 相似文献
8.
9.
10.