全文获取类型
收费全文 | 815篇 |
免费 | 57篇 |
国内免费 | 1篇 |
专业分类
儿科学 | 63篇 |
妇产科学 | 7篇 |
基础医学 | 113篇 |
口腔科学 | 14篇 |
临床医学 | 104篇 |
内科学 | 159篇 |
皮肤病学 | 10篇 |
神经病学 | 57篇 |
特种医学 | 159篇 |
外科学 | 50篇 |
综合类 | 14篇 |
预防医学 | 46篇 |
眼科学 | 7篇 |
药学 | 50篇 |
肿瘤学 | 20篇 |
出版年
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2018年 | 14篇 |
2017年 | 4篇 |
2016年 | 4篇 |
2015年 | 7篇 |
2014年 | 17篇 |
2013年 | 33篇 |
2012年 | 20篇 |
2011年 | 25篇 |
2010年 | 39篇 |
2009年 | 22篇 |
2008年 | 19篇 |
2007年 | 26篇 |
2006年 | 16篇 |
2005年 | 21篇 |
2004年 | 13篇 |
2003年 | 12篇 |
2002年 | 13篇 |
2001年 | 21篇 |
2000年 | 19篇 |
1999年 | 18篇 |
1998年 | 36篇 |
1997年 | 31篇 |
1996年 | 27篇 |
1995年 | 29篇 |
1994年 | 31篇 |
1993年 | 22篇 |
1992年 | 15篇 |
1991年 | 16篇 |
1990年 | 17篇 |
1989年 | 20篇 |
1988年 | 26篇 |
1987年 | 21篇 |
1986年 | 20篇 |
1985年 | 26篇 |
1984年 | 11篇 |
1983年 | 18篇 |
1982年 | 23篇 |
1981年 | 14篇 |
1980年 | 12篇 |
1978年 | 8篇 |
1977年 | 9篇 |
1976年 | 17篇 |
1975年 | 10篇 |
1974年 | 5篇 |
1972年 | 5篇 |
1971年 | 5篇 |
1961年 | 2篇 |
排序方式: 共有873条查询结果,搜索用时 0 毫秒
41.
42.
Regional myocardial dysfunction: evaluation of patients with prior myocardial infarction with fast CT 总被引:1,自引:0,他引:1
Lipton MJ; Farmer DW; Killebrew EJ; Bouchard A; Dean PB; Ringertz HG; Higgins CB 《Radiology》1985,157(3):735-740
A prototype ultrafast cine computed tomographic (CT) scanner, designed specifically for cardiac imaging, was used to evaluate a preliminary series of patients with prior myocardial infarction (n = 21) and a control group without coronary artery disease (n = 5). Multilevel 50-msec CT scan exposures were obtained during peripheral intravenous bolus injections of contrast medium. A comparison was made between cine-CT scans and standard left ventriculographic images in assessing segmental left ventricular motion. Results indicate that cine CT, performed at sufficiently rapid speeds (20 scans per second) to allow useful analysis of regional ventricular wall motion, can provide adequate image quality. Analysis of 110 segments revealed a good correlation (90.9%) between the two techniques in characterizing normal from abnormal regional wall motion. Cine CT, based on this initial study, demonstrates considerable potential for evaluating not only cardiac chamber dimensions but also segmental wall dynamics. 相似文献
43.
Peralta R Ryan DP Iribrane A Fitzsimons MG 《The Journal of extra-corporeal technology》2005,37(1):71-74
Near drowning is a common event among otherwise healthy young people. The development of ARDS in the setting may significantly increase mortality. The traditional means of ventilation may lead to barotrauma. Extracorporeal membrane oxygenation (ECMO) is an effective means to improve oxygenation and remove carbon dioxide, while allowing the lungs to recover from the acute insult. It may be especially successful in those victims with single organ injury. We report the use of ECMO in a young adult with ARDS and pneumonia after near drowning. 相似文献
44.
A number of surgical clips and other metallic materials embedded within patients have ferromagnetic properties that present a potential hazard when in the strong fields associated with magnetic resonance imaging. Several types of magnetometers and metal detectors were investigated as possible pre-imaging screening devices. The sensitivities and costs of these devices are given. 相似文献
45.
46.
Naloxone in the prevention of the adverse cognitive effects of ECT: a within-subject, placebo controlled study. 总被引:3,自引:0,他引:3
Electroconvulsive therapy (ECT) is a highly effective treatment for major depression, but is also associated with characteristic cognitive side effects. Several reports document that endogenous opioids and their receptors are activated by electroconvulsive shock (ECS) and that naloxone in doses sufficient to block endogenous opioid receptors may reverse ECS-induced retrograde amnesia. This placebo-controlled, randomized, within-patient study was conducted to examine the potential of naloxone, given in doses sufficient to block opioid receptors (high dose), to ameliorate acute anterograde and retrograde memory impairments following ECT. Compared to placebo and low dose naloxone, high dose naloxone administered immediately before ECT resulted in significant reductions in anterograde amnesia, and better performance on an attention task. Both low and high dose naloxone improved verbal fluency. There were no beneficial effects of high dose naloxone on retrograde amnesia, and an indication that high dose naloxone may have worsened retrograde amnesia for shape stimuli. There were no effects of high dose naloxone on seizure duration, vital signs, and subjective side effects. The study is consistent with prior research in which change in behavioral and physiological measures was produced principally by naloxone doses sufficient to block endogenous opioid receptors and offers evidence of the potential for ameliorating some adverse cognitive effects associated with ECT. 相似文献
47.
Spontaneous regression of an anaplastic large cell lymphoma in the oral cavity: first reported case and review of the literature 总被引:2,自引:0,他引:2
Lymphomas account for 2–5% of all oral malignancies and are the third most common in this site. This case report appears to be the first in the world literature describing spontaneous regression in the oral cavity of a subset of non-Hodgkins lymphomas known as Ki-1 anaplastic large cell lymphomas (ALCL). Ki-1 ALCL account for 2–7% of all non-Hodgkins lymphomas and the clinical presentation is variable; they may arise de novo or in the setting of a separate primary lymphoma and commonly present in the extra-nodal location. Disease severity is also variable with waxing and waning lesions at one extreme which may spontaneously regress to bone marrow involvement in around 12% of cases. This case is especially interesting since the patient is a farmer, given the recent evidence that there may be a link between non-Hodgkins lymphoma and this occupation. 相似文献
48.
Fifteen infants with life-threatening gastrointestinal anomalies received total parenteral feeding for periods ranging from 10 to 54 days; their ages ranged from one day to 5 months. The solutions were administered through peripheral veins. All patients gained weight during the period of observation and no cases of septicaemia were encountered. 相似文献
49.
Inpatient management: a new role for interventional radiologists 总被引:2,自引:0,他引:2
50.
商陆多糖Ⅰ联合白细胞介素2对小鼠脾细胞杀瘤活性的影响 总被引:2,自引:0,他引:2
商陆多糖Ⅰ(PAP-I),0.3~3μg·ml-1和小鼠脾细胞培养3~5d可显著增强其杀伤P815肿瘤细胞活性及IL-2(250~500IU·ml-1)诱导的LAK细胞活性,最适浓度为1μg·ml-1。PAP-I及IL-2和脾细胞培养的上清液对P815肿瘤细胞无细胞毒作用,但能增强脾细胞及LAK细胞杀瘤活性。PAP-I,5,10及50mg·kg-1,ip可增强脾细胞杀伤P815和L929细胞的活性及IL-2诱导的LAK细胞活性。 相似文献