全文获取类型
收费全文 | 3223篇 |
免费 | 162篇 |
国内免费 | 78篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 199篇 |
妇产科学 | 35篇 |
基础医学 | 350篇 |
口腔科学 | 70篇 |
临床医学 | 365篇 |
内科学 | 713篇 |
皮肤病学 | 113篇 |
神经病学 | 137篇 |
特种医学 | 485篇 |
外科学 | 351篇 |
综合类 | 60篇 |
一般理论 | 1篇 |
预防医学 | 146篇 |
眼科学 | 45篇 |
药学 | 163篇 |
2篇 | |
中国医学 | 2篇 |
肿瘤学 | 214篇 |
出版年
2023年 | 8篇 |
2022年 | 12篇 |
2021年 | 23篇 |
2020年 | 22篇 |
2019年 | 25篇 |
2018年 | 54篇 |
2017年 | 41篇 |
2016年 | 49篇 |
2015年 | 67篇 |
2014年 | 85篇 |
2013年 | 109篇 |
2012年 | 107篇 |
2011年 | 127篇 |
2010年 | 139篇 |
2009年 | 135篇 |
2008年 | 149篇 |
2007年 | 186篇 |
2006年 | 128篇 |
2005年 | 152篇 |
2004年 | 86篇 |
2003年 | 77篇 |
2002年 | 78篇 |
2001年 | 72篇 |
2000年 | 57篇 |
1999年 | 57篇 |
1998年 | 144篇 |
1997年 | 162篇 |
1996年 | 137篇 |
1995年 | 116篇 |
1994年 | 122篇 |
1993年 | 102篇 |
1992年 | 34篇 |
1991年 | 39篇 |
1990年 | 44篇 |
1989年 | 65篇 |
1988年 | 51篇 |
1987年 | 48篇 |
1986年 | 56篇 |
1985年 | 54篇 |
1984年 | 35篇 |
1983年 | 23篇 |
1982年 | 26篇 |
1981年 | 31篇 |
1980年 | 29篇 |
1979年 | 8篇 |
1978年 | 11篇 |
1977年 | 21篇 |
1976年 | 26篇 |
1975年 | 14篇 |
1967年 | 3篇 |
排序方式: 共有3463条查询结果,搜索用时 15 毫秒
1.
JM Martín† L Calduch† C Monteagudo‡ I Molina† D Ramón† V Alonso† E Jordᆠ《Journal of the European Academy of Dermatology and Venereology》2006,20(4):428-431
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified. 相似文献
2.
JM Vilanova J Figueras-Aloy J Roselló G Gómez E Gelpí R Jiménez 《Acta paediatrica (Oslo, Norway : 1992)》1998,87(5):588-592
The aim of this study was to evaluate the cerebral synthesis of eicosanoids in the asphyctic newborn and to investigate the relation between the prostanoid profiles in cerebrospinal fluid (CSF) and the appearance and severity of hypoxic-ischaemic encephalopathy (HIE). Levels of 6-keto-PGF 1-α, TXB2 , PGE2 and PGF2-α in CSF were measured in 40 full term newborns during the first day of life. Thirty of these newborns had birth asphyxia and were divided into three groups: 10 without HIE, 12 with mild HIE and 8 with moderate-severe HIE. They were compared to a control group of 10 non-hypoxic newborns. Determinations of the metabolites in CSF were performed by RIA and expressed as pg/ml (mean ± SD). The CSF TXB2 (thromboxane A2 metabolite) in asphyxiated newborns was always higher than in the control group (28.12 ± 10.6), and related to the severity of HIE ( p = 0:005): without HIE (50.84 ± 16.4; p = 0:02), mild HIE (80.65 ± 12.64; p ± 0:01) and moderate-severe HIE (178.14 ± 20.5; p < 0:01). The CSF 6-keto-PGF 1-α (prostacyclin metabolite) in asphyxiated newborns was always higher than in the control group (80.55 ± 12.56), but indirectly related to the severity of HIE: without HIE (240.95 ± 28.12; p < 0:01), mild HIE (183.65 ± 30.1; p < 0:01) and moderate-severe HIE (140.55 ± 25.12; p < 0:01). In the moderate-severe HIE group, the increase in TXB2 was higher than the rise in 6-keto-PGF 1-α . 相似文献
3.
4.
Influence of Electromagnetic Fields on Function of Automated External Defibrillators 总被引:3,自引:2,他引:1
Roman Fleischhackl MD Florian Singer MD Wolfgang Nitsche PhD MSc Eng Guenther Gamperl MSc Engineering Bernhard Roessler MD Jasmin Arrich MD Sabine Fleischhackl MD Heidrun Losert MD Fritz Sterz MD Martina Mittlboeck PhD MSc Klaus Hoerauf PhD MD 《Academic emergency medicine》2006,13(1):1-6
Objectives: In this study, the authors tested whether electromagnetic interference (EMI) is able to impair correct electrocardiogram analysis and produce false‐positive shock advice from automated external defibrillators (AEDs) when the true rhythm is sinus. Methods: Nineteen healthy subjects were used to test five AEDs available on the Austrian market in a prospective, open, and sequence‐randomized study. The primary outcome variable was the absolute number of shocks advised in the presence of EMI. The secondary outcome was the number of impaired analyses caused by incorrectly detected patient movements or electrode failure. Results: Of 760 tests run, 18 (2.37%) cases of false‐positive results occurred, and two of five AEDs recommended shocks in the presence of sinus rhythm. Of 760 tests run, no electrode failures occurred. There were 27 occurrences (3.55%) of motion detected by an AED in the presence of strong electromagnetic fields. Conclusions: AED models differ in their response to EMI; it may be useful to consider specific safety requirements for areas with such fields present. Working personnel and emergency medical services staff should be informed about potential risks and the possible need for patient evacuation before AEDs are attached and shock recommendations are followed. 相似文献
5.
6.
7.
8.
9.
10.
Ralls PW; Johnson MB; Kanel G; Dobalian DM; Colletti PM; Boswell WD Jr; Radin DR; Halls JM 《Radiology》1986,161(2):451-454
FM sonography - a signal-processing technique that uses frequency and phase information as well as amplitude data - shows promise in evaluation of patients with diffuse liver disease. In a prospective blinded review of 37 patients with biopsy-proved liver disease and 42 healthy volunteers, FM sonography was clearly superior to traditional amplitude-based (AM) sonography in distinguishing healthy from diseased subjects. Statistically significant differences were seen in accuracy (FM, 98.7%; AM, 84.8%), sensitivity (FM, 97.3%; AM, 70.3%), and negative predictive value (FM, 97.7%; AM, 78.8%). Our data also suggest that current FM sonographic techniques cannot differentiate among histologic findings associated with different hepatic parenchymal abnormalities. It is unclear, therefore, whether FM imaging can reduce the numbers of patients who require biopsy for diagnosis or the frequency of biopsy procedures in patients with known disease. 相似文献