全文获取类型
收费全文 | 2866篇 |
免费 | 163篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 35篇 |
儿科学 | 44篇 |
妇产科学 | 105篇 |
基础医学 | 373篇 |
口腔科学 | 343篇 |
临床医学 | 206篇 |
内科学 | 569篇 |
皮肤病学 | 70篇 |
神经病学 | 236篇 |
特种医学 | 58篇 |
外科学 | 273篇 |
综合类 | 12篇 |
一般理论 | 3篇 |
预防医学 | 261篇 |
眼科学 | 39篇 |
药学 | 259篇 |
中国医学 | 17篇 |
肿瘤学 | 132篇 |
出版年
2023年 | 27篇 |
2022年 | 23篇 |
2021年 | 99篇 |
2020年 | 65篇 |
2019年 | 94篇 |
2018年 | 111篇 |
2017年 | 87篇 |
2016年 | 77篇 |
2015年 | 102篇 |
2014年 | 123篇 |
2013年 | 165篇 |
2012年 | 204篇 |
2011年 | 246篇 |
2010年 | 145篇 |
2009年 | 104篇 |
2008年 | 175篇 |
2007年 | 175篇 |
2006年 | 143篇 |
2005年 | 134篇 |
2004年 | 118篇 |
2003年 | 99篇 |
2002年 | 72篇 |
2001年 | 60篇 |
2000年 | 45篇 |
1999年 | 52篇 |
1998年 | 22篇 |
1997年 | 15篇 |
1996年 | 5篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1993年 | 6篇 |
1992年 | 18篇 |
1991年 | 21篇 |
1990年 | 26篇 |
1989年 | 20篇 |
1988年 | 15篇 |
1987年 | 8篇 |
1986年 | 18篇 |
1985年 | 7篇 |
1984年 | 16篇 |
1983年 | 13篇 |
1981年 | 7篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1976年 | 5篇 |
1974年 | 6篇 |
1973年 | 8篇 |
1970年 | 4篇 |
1969年 | 4篇 |
1967年 | 4篇 |
排序方式: 共有3035条查询结果,搜索用时 46 毫秒
1.
J. M. Nolde M. P. Schlaich D. I. Sessler A. Mian T. B. Corcoran C. K. Chow M. T. V. Chan F. K. Borges M. H. McGillion P. S. Myles N. L. Mills P. J. Devereaux G. S. Hillis 《Anaesthesia》2023,78(7):853-860
Myocardial injury due to ischaemia within 30 days of non-cardiac surgery is prognostically relevant. We aimed to determine the discrimination, calibration, accuracy, sensitivity and specificity of single-layer and multiple-layer neural networks for myocardial injury and death within 30 postoperative days. We analysed data from 24,589 participants in the Vascular Events in Non-cardiac Surgery Patients Cohort Evaluation study. Validation was performed on a randomly selected subset of the study population. Discrimination for myocardial injury by single-layer vs. multiple-layer models generated areas (95%CI) under the receiver operating characteristic curve of: 0.70 (0.69–0.72) vs. 0.71 (0.70–0.73) with variables available before surgical referral, p < 0.001; 0.73 (0.72–0.75) vs. 0.75 (0.74–0.76) with additional variables available on admission, but before surgery, p < 0.001; and 0.76 (0.75–0.77) vs. 0.77 (0.76–0.78) with the addition of subsequent variables, p < 0.001. Discrimination for death by single-layer vs. multiple-layer models generated areas (95%CI) under the receiver operating characteristic curve of: 0.71 (0.66–0.76) vs. 0.74 (0.71–0.77) with variables available before surgical referral, p = 0.04; 0.78 (0.73–0.82) vs. 0.83 (0.79–0.86) with additional variables available on admission but before surgery, p = 0.01; and 0.87 (0.83–0.89) vs. 0.87 (0.85–0.90) with the addition of subsequent variables, p = 0.52. The accuracy of the multiple-layer model for myocardial injury and death with all variables was 70% and 89%, respectively. 相似文献
2.
3.
Jules Rimet Borges Bárbara Álvares Salum Ximenes Flávia Tandaya Grandi Miranda Giordana Bruna Moreira Peres Isabella Toscano Hayasaki Luiz César de Camargo Ferro Mayra Ianhez Marco Tulio Antonio Garcia-Zapata 《Anais brasileiros de dermatologia》2022,97(4):424-434
BackgroundChromoblastomycosis is a skin infection caused by dematiaceous fungi that take the form of muriform cells in the tissue. It mainly manifests as verrucous plaques on the lower limbs of rural workers in tropical countries.ObjectivesThe primary objective of this review is to evaluate the accuracy of diagnostic methods for the identification of chromoblastomycosis, considering the histopathological examination as the reference test.MethodsMEDLINE, LILACS and Scielo databases were consulted using the terms “chromoblastomycosis” AND “diagnosis”. The eligibility criteria were: studies that evaluated the accuracy of tests for the diagnosis of chromoblastomycosis. Eleven studies were selected. Statistical analysis included the calculation of sensitivity and specificity of the diagnostic methods.ResultsConsidering the histopathological examination as the reference test, the culture showed a sensitivity (S) of 37.5% - 90.9% and a specificity (Sp) of 100%; while direct mycological examination showed S = 50% - 91.6% and Sp of 100% . Considering the culture as the reference test, the serology (precipitation techniques) showed S of 36% - 99%; and Sp of 80% - 100%; while the intradermal test showed S of 83.3% - 100% and Sp of 99.4% - 100%.Study limitationsThe small number of studies and very discrepant sensitivity results among them do not allow the calculation of summary measures through a meta-analysis.ConclusionsDirect mycological examination, culture, intradermal test and serology show sensitivity and specificity values ??for the diagnosis of chromoblastomycosis with no significant difference between the studies. 相似文献
4.
5.
6.
Attenuation of experimental asthma by mycobacterial protein combined with CpG requires a TLR9‐dependent IFN‐γ‐CCR2 signalling circuit 下载免费PDF全文
7.
8.
9.