全文获取类型
收费全文 | 17370篇 |
免费 | 1406篇 |
国内免费 | 69篇 |
专业分类
耳鼻咽喉 | 135篇 |
儿科学 | 535篇 |
妇产科学 | 264篇 |
基础医学 | 2302篇 |
口腔科学 | 334篇 |
临床医学 | 1863篇 |
内科学 | 3958篇 |
皮肤病学 | 192篇 |
神经病学 | 1595篇 |
特种医学 | 543篇 |
外科学 | 2675篇 |
综合类 | 392篇 |
一般理论 | 14篇 |
预防医学 | 1407篇 |
眼科学 | 561篇 |
药学 | 1061篇 |
中国医学 | 47篇 |
肿瘤学 | 967篇 |
出版年
2022年 | 78篇 |
2021年 | 252篇 |
2020年 | 154篇 |
2019年 | 259篇 |
2018年 | 263篇 |
2017年 | 198篇 |
2016年 | 212篇 |
2015年 | 266篇 |
2014年 | 410篇 |
2013年 | 709篇 |
2012年 | 1000篇 |
2011年 | 1067篇 |
2010年 | 572篇 |
2009年 | 553篇 |
2008年 | 887篇 |
2007年 | 1019篇 |
2006年 | 959篇 |
2005年 | 986篇 |
2004年 | 937篇 |
2003年 | 917篇 |
2002年 | 921篇 |
2001年 | 288篇 |
2000年 | 291篇 |
1999年 | 264篇 |
1998年 | 209篇 |
1997年 | 176篇 |
1996年 | 170篇 |
1995年 | 175篇 |
1994年 | 164篇 |
1993年 | 148篇 |
1992年 | 202篇 |
1991年 | 192篇 |
1990年 | 153篇 |
1989年 | 142篇 |
1988年 | 144篇 |
1987年 | 134篇 |
1986年 | 136篇 |
1985年 | 145篇 |
1984年 | 143篇 |
1983年 | 155篇 |
1982年 | 180篇 |
1981年 | 156篇 |
1980年 | 120篇 |
1979年 | 115篇 |
1978年 | 127篇 |
1977年 | 111篇 |
1976年 | 90篇 |
1975年 | 106篇 |
1974年 | 97篇 |
1973年 | 92篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Changing patterns of hip fracture care before and after implementation of the prospective payment system 总被引:6,自引:0,他引:6
We tested the hypothesis that since the implementation of the prospective payment system (PPS), elderly patients hospitalized for hip fractures receive shorter, less care-intensive hospitalizations and are more frequently institutionalized. In blinded fashion, we reviewed the charts of elderly patients with hip fractures admitted to a municipal hospital from 1981 through 1985. Demographic and clinical characteristics of patients treated before implementation of the PPS were similar to patients treated thereafter. After implementation of the PPS, the mean length of hospitalization fell from 16.6 to 10.3 days, and the mean number of physical therapy sessions received decreased from 9.7 to 4.9. Concomitantly, the proportion of patients discharged to a nursing home increased (21% to 48%), as did the proportion receiving nursing home care at six months after discharge (13% to 39%). This increase in long-term nursing home placement suggests that the quality of care for elderly patients with hip fractures may have deteriorated. 相似文献
22.
23.
24.
25.
J Dobranowski J M Fitzgerald F Baxter D Woods 《Journal l'Association canadienne des radiologistes》1992,43(1):35-39
The authors describe 12 patients in whom feeding tubes were inadvertently placed in the bronchial tree a total of 14 times. All but four of the misplacements were complicated by pneumothorax. No deaths were directly attributable to the misplacements, although one cardiac arrest occurred as a late complication of intrapleural feeding. Careful, controlled insertion of feeding tubes and radiographic confirmation of their placement are essential to reduce morbidity and mortality. 相似文献
26.
The effect of oral dosing of xamoterol on systolic time intervals in man and xamoterol plasma concentrations in heart failure patients. 下载免费PDF全文
M A James M Papouchado K S Channer J V Jones H F Marlow W Bastain N P Barker J D Harry A G Wardleworth 《British journal of clinical pharmacology》1990,29(4):447-453
1. Six healthy male human volunteers of mean age 30.8 years (range 23-37) were given single oral doses of xamoterol (20, 50, 100 or 250 mg) and placebo with a 1 week interval between each dose. Xamoterol produced a significant decrease in systolic time intervals (QS2I, LVETI and PEPI) and a significant increase in systolic blood pressure indicating a positive inotropic effect on the heart at rest. The changes in QS2I were dose-related. Maximum decreases in QS2I were noted 1 to 2 h after dosing and were achieved with a dose of 100 mg. 2. In a second study, oral administration of xamoterol at 3 doses (100, 200 or 300 mg) and placebo were studied in 12 patients of mean age 60.4 years (range 52-73) with mild to moderate heart failure. Each dose was given twice daily for 7 days in a random order. Each dose of xamoterol produced a significant decrease in systolic time intervals indicating a positive inotropic effect on the heart at rest in patients with heart failure. It was not possible to distinguish between the effects of the three doses of xamoterol. 3. In heart failure patients, peak plasma concentrations of xamoterol occurred 1 to 2 h after dosing at all dosage levels and there was a linear relationship between dose and plasma concentration. 4. In both studies xamoterol was well tolerated and only minor adverse experiences were reported. 5. We conclude that, at rest, xamoterol has a positive inotropic effect on the heart when given orally to healthy volunteers or patients with mild to moderate heart failure. 相似文献
27.
Photopatch testing: a consensus methodology for Europe 总被引:1,自引:0,他引:1
D.P. Bruynzeel J. Ferguson K. Andersen M. Gonçalo John English A. Goossens E. Holzle S.H. Ibbotson M. Lecha P. Lehmann F. Leonard Harry Moseley P. Pigatto A. Tanew 《Journal of the European Academy of Dermatology and Venereology》2004,18(6):679-682
A group of interested European Contact Dermatologists/Photobiologists met to produce a consensus statement on methodology, test materials and interpretation of photopatch testing. While it is recognized that a range of local variables operate throughout Europe, the underlying purpose of the work is to act as an essential preamble to a Pan European Photopatch Test Study focusing particularly on sunscreen chemicals. 相似文献
28.
Andrea DiMartini Lubna Javed Sarah Russell Mary Amanda Dew Mary Grace Fitzgerald Ashok Jain John Fung 《Liver transplantation》2005,11(6):679-683
Alcohol and tobacco use commonly co-occur, with at least 90% of those with an alcohol problem also using tobacco. Thus, 3 years ago when we discovered higher rate of late deaths due to lung and oropharyngeal cancer in patients who had received a transplant for alcoholic liver disease (ALD), we hypothesized that these patients were continuing to expose themselves to tobacco after liver transplantation (post-LTX) and that this behavior was increasing their risk for cancer. We subsequently began a prospective investigation of post-LTX tobacco use in patients having undergone LTX for ALD (n = 172). For 33 recipients we had data starting from our first assessment at 3 months post-LTX and for this subgroup we report on the details of the timing of tobacco use resumption and the redevelopment of nicotine addiction. We found that on average more than 40% are smoking across all time periods. ALD recipients resume smoking early post-LTX, increase their consumption over time, and quickly become tobacco dependent. These data highlight an underrecognized serious health risk for these patients and demonstrate our need for more stringent clinical monitoring and intervention for tobacco use in the pre- and post-LTX periods. 相似文献
29.
30.