全文获取类型
收费全文 | 1519篇 |
免费 | 82篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 93篇 |
妇产科学 | 103篇 |
基础医学 | 119篇 |
口腔科学 | 42篇 |
临床医学 | 165篇 |
内科学 | 320篇 |
皮肤病学 | 45篇 |
神经病学 | 24篇 |
特种医学 | 145篇 |
外科学 | 112篇 |
综合类 | 135篇 |
预防医学 | 93篇 |
眼科学 | 10篇 |
药学 | 89篇 |
1篇 | |
中国医学 | 74篇 |
肿瘤学 | 35篇 |
出版年
2021年 | 15篇 |
2020年 | 10篇 |
2018年 | 12篇 |
2017年 | 18篇 |
2016年 | 14篇 |
2015年 | 33篇 |
2014年 | 42篇 |
2013年 | 42篇 |
2012年 | 48篇 |
2011年 | 46篇 |
2010年 | 54篇 |
2009年 | 44篇 |
2008年 | 43篇 |
2007年 | 33篇 |
2006年 | 36篇 |
2005年 | 16篇 |
2004年 | 17篇 |
2003年 | 12篇 |
2002年 | 11篇 |
2001年 | 20篇 |
1999年 | 19篇 |
1998年 | 43篇 |
1997年 | 54篇 |
1996年 | 47篇 |
1995年 | 42篇 |
1994年 | 55篇 |
1993年 | 35篇 |
1992年 | 15篇 |
1991年 | 14篇 |
1990年 | 14篇 |
1989年 | 28篇 |
1988年 | 27篇 |
1987年 | 30篇 |
1986年 | 25篇 |
1985年 | 16篇 |
1984年 | 16篇 |
1983年 | 16篇 |
1982年 | 13篇 |
1981年 | 23篇 |
1980年 | 16篇 |
1977年 | 9篇 |
1959年 | 35篇 |
1958年 | 58篇 |
1957年 | 87篇 |
1956年 | 45篇 |
1955年 | 75篇 |
1954年 | 67篇 |
1953年 | 16篇 |
1952年 | 14篇 |
1949年 | 10篇 |
排序方式: 共有1614条查询结果,搜索用时 15 毫秒
111.
Direct sagittal computed tomographic scanning (DSCT) of the shoulder was performed in 42 symptomatic patients, six healthy volunteers, and two cadaver shoulders. Axial CT scanning and double-contrast arthrography with plain radiographs were performed in 41 patients for comparison. DSCT enabled correct identification of 27 of 29 lesions in 24 patients. Seventeen patients had normal shoulders. Axial CT scanning and DSCT together enabled correct identification of all lesions and were markedly superior to plain-film arthrography. DSCT enabled diagnosis of all cases of complete rotator cuff tear plus three cases of incomplete tear and three of rotator cuff atrophy not identified by the other techniques. Axial CT scanning was better than DSCT for diagnosis of Bankart lesions. 相似文献
112.
International Headache Society classification: interobserver reliability in the diagnosis of primary headaches 总被引:1,自引:0,他引:1
F Granella R D'Alessandro GC Manzoni R Cerbo C Colucci D'Amato LA Pini L Savi C Zanferrari G Nappi 《Cephalalgia : an international journal of headache》1994,14(1):16-20
We assessed interobserver reliability of the International Headache Society (IBIS) classification for diagnosis of primary headaches. The study was performed on 103 patients consecutively seen at two Headache Centres. Each patient was given a structured interview recorded on videotape. Four experienced clinicians then reviewed the interviews separately and made a diagnosis of headache according to IHS criteria at the one- and two-digit levels. At both the one- and the two-digit level the agreement was substantial (Kappa = 0.74 and 0.65, respectively). The analysis of reliability for each of nine items necessary for diagnosis showed an agreement ranging from substantial (Kappa = 0.69) to almost perfect (Kappa = 0.89). Our results indicate that the IHS classification has a good reliability for the diagnosis of primary headaches at the one- and two-digit levels. 相似文献
113.
MARIA TERESA LA ROVERE PETER J. SCHWARTZ 《Pacing and clinical electrophysiology : PACE》1997,20(10):2602-2613
The last two decades have provided clear evidence for the tight and casual relation existing between arrhythmic mortality and the autonomic nervous system, particularly with imbalances characterized by decreases in vagal and/or increases in sympathetic activity. A series of compelling experimental results has represented the driving force for the clinical evaluation of the potential prognostic value of baroreflex sensitivity (BBS), a measure that can provide information on the capability to augment vagal activity. This article reviews the methodology more commonly used to quantify the clinical evaluation of this parameter, and then focuses on the key clinical studies highlighting those performed in postmyocardial infarction patients. Among them the most informative is ATRAMI, a multicenter prospective study involving almost 1300 patients. The main conclusion is that both heart rate variability and BRS are strong and independent risk factors for post-infarction mortality, thus demonstrating the clinical usefulness of autonomic markers. 相似文献
114.
115.
116.
117.
VOLKER LANG BÉLA MERKELY LÁSZLÓ GELLÉR ORSOLYA KISS JÖRG P. STRÖBEL MAX SCHALDACH 《Pacing and clinical electrophysiology : PACE》1998,21(1):227-230
This study investigates the influence of various lead geometry on intracardial signals like the monophasic action potential (MAP) to optimize the geometry of implantable MAP leads. The experimental results were compared with a field theoretical approach to the origin of MAP from the transmembrane potential (TAP). During the experiments several lead geometries (tip surface: 1.3 to 12 mm2 ; tip-ring distance: 0.8 mm to 25 cm; ring surface: 1.8mm2 to 40 mm2 ) were investigated in endo- and epicardial positions in 12 dogs (17±9 kg). The electrodes were fixed passively (tines) or actively (screws). MAP was recorded during several interventions and correlated with MAP measured using an Ag-AgCl MAP catheter. The experimental results showed that small tips provided high MAP amplitudes with less pressure. No difference was observed using active and passive fixations. A tip-ring distance smaller than 5 mm with a ring surface smaller than the tip (<5 mm2 ) avoided artifacts in the repolarization course. For the theoretical approach the quasistatic, anisotropic bidomain model was calculated in smalt unity volumes Vi where the TAP φm was constant and represented by the current density J. Two solutions for electrode positions at and outside the heart were achieved. By superposition of each solution φei the summed potential at the electrode position was calculated. The theoretical findings show in good correlation with the experimental results that a larger distance than 10 mm leads to distortions in repolarization course by signals proportional to φout . 相似文献
118.
119.
120.
Contribution of antigen-presenting cell major histocompatibility complex gene products to the specificity of antigen-induced T cell activation 总被引:7,自引:25,他引:7 下载免费PDF全文
E Heber-Katz RH Schwartz LA Matis C Hannum T Fairwell E Appella D Hansburg 《The Journal of experimental medicine》1982,155(4):1086-1099