全文获取类型
收费全文 | 19450篇 |
免费 | 966篇 |
国内免费 | 110篇 |
专业分类
耳鼻咽喉 | 314篇 |
儿科学 | 377篇 |
妇产科学 | 375篇 |
基础医学 | 2446篇 |
口腔科学 | 1322篇 |
临床医学 | 1433篇 |
内科学 | 4650篇 |
皮肤病学 | 361篇 |
神经病学 | 1710篇 |
特种医学 | 387篇 |
外科学 | 2781篇 |
综合类 | 87篇 |
一般理论 | 7篇 |
预防医学 | 1577篇 |
眼科学 | 334篇 |
药学 | 1219篇 |
中国医学 | 132篇 |
肿瘤学 | 1014篇 |
出版年
2024年 | 19篇 |
2023年 | 190篇 |
2022年 | 388篇 |
2021年 | 719篇 |
2020年 | 424篇 |
2019年 | 579篇 |
2018年 | 699篇 |
2017年 | 474篇 |
2016年 | 527篇 |
2015年 | 610篇 |
2014年 | 876篇 |
2013年 | 1043篇 |
2012年 | 1661篇 |
2011年 | 1690篇 |
2010年 | 914篇 |
2009年 | 744篇 |
2008年 | 1303篇 |
2007年 | 1239篇 |
2006年 | 1124篇 |
2005年 | 1038篇 |
2004年 | 887篇 |
2003年 | 729篇 |
2002年 | 678篇 |
2001年 | 208篇 |
2000年 | 203篇 |
1999年 | 178篇 |
1998年 | 139篇 |
1997年 | 94篇 |
1996年 | 79篇 |
1995年 | 84篇 |
1994年 | 56篇 |
1993年 | 56篇 |
1992年 | 88篇 |
1991年 | 85篇 |
1990年 | 56篇 |
1989年 | 64篇 |
1988年 | 52篇 |
1987年 | 57篇 |
1986年 | 49篇 |
1985年 | 48篇 |
1984年 | 30篇 |
1983年 | 25篇 |
1981年 | 22篇 |
1980年 | 23篇 |
1979年 | 19篇 |
1978年 | 21篇 |
1977年 | 19篇 |
1975年 | 26篇 |
1974年 | 22篇 |
1969年 | 21篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
Willy Baccaglini Felipe A. Glina Cristiano Linck Pazeto Luis G. Medina Fernando Korkes Wanderley M. Bernardo Rene Sotelo Sidney Glina Giancarlo Marra Marco Moschini Xavier Cathelineau Rafael Sanchez-Salas 《Clinical genitourinary cancer》2021,19(1):3-11.e1
This meta-analysis focuses on the accuracy of upgrading to clinically significant prostate cancer (PCa) by multiparametric magnetic resonance imaging-targeted biopsy (MRI-TB) versus systematic biopsy (SB). We searched the Medline, Embase, Cochrane Central Register of Controlled Trials, Web of Science, Scopus, and Literatura Latino Americana em Ciências da Saúde databases through January 2020 for comparative, retrospective/prospective, paired-cohort, and randomized clinical trials with paired comparisons. The population consisted of patients with low-risk PCa in active surveillance with at least 1 index lesion on imaging. We evaluated the quality of evidence by using the Quality Assessment of Diagnostic Accuracy Studies-2 score. Group comparisons considered the differences between the area under the curve summary receiver operating characteristic curve in a 2-tailed method. We also compared the positive predictive value of the best single method (MRI-TB or SB) and the referral study test (combined biopsy, a combination of MRI-TB and SB). The meta-analysis included 6 studies enrolling 741 patients. The pooled sensitivity for the 2 groups was 0.79 (95% confidence interval, 0.74-0.83; I2 = 75%) and 0.67 (95% confidence interval, 0.63-0.74; I2 = 55.4%), respectively. The area under the curve for the MRI-TB and SB groups were 0.99 and 0.92 (P < .001), respectively. The positive predictive value for the MRI-TB and combined biopsy groups were similar. The accumulated evidence suggests better results for MRI-TB compared with SB. Therefore, use of MRI-TB alone may be preferable in patients in active surveillance harboring low-risk PCa. 相似文献
4.
Del Lama Rafael Silva Candido Raquel Mariana Chiari-Correia Natália Santana Nogueira-Barbosa Marcello Henrique de Azevedo-Marques Paulo Mazzoncini Tinós Renato 《Journal of digital imaging》2022,35(3):446-458
Journal of Digital Imaging - Vertebral Compression Fracture (VCF) occurs when the vertebral body partially collapses under the action of compressive forces. Non-traumatic VCFs can be secondary to... 相似文献
5.
6.
John Lennon Silva Cunha Amanda Almeida Leite Thamiris de Castro Abrantes Lorena Passoni Vervloet Thayn Melo de Lima Morais Gerson de Oliveira Paiva Neto Tatiana Nayara Librio Kimura Snia Maria Soares Ferreira Ricardo Luiz Cavalcanti de Albuquerque‐Júnior Aline Corrêa Abraho Mario Jos Romaach Bruno Augusto Benevenuto de Andrade Oslei Paes de Almeida Ciro Dantas Soares 《Journal of cutaneous pathology》2021,48(1):24-33
7.
Miguel A. Sanz Pau Montesinos Haesook T. Kim Guillermo J. Ruiz-Argüelles María S. Undurraga María R. Uriarte Lem Martínez Rafael H. Jacomo Homero Gutiérrez-Aguirre Raul A. M. Melo Rosane Bittencourt Ricardo Pasquini Katia Pagnano Evandro M. Fagundes Edo Vellenga Alexandra Holowiecka Ana J. González-Huerta Pascual Fernández Javier De la Serna Salut Brunet Elena De Lisa José González-Campos José M. Ribera Isabel Krsnik Arnold Ganser Nancy Berliner Raul C. Ribeiro Francesco Lo-Coco Bob L?wenberg Eduardo M. Rego 《Annals of hematology》2015,94(8):1347-1356
8.
de Oliveira Adilson J M Solla Davi J. F. de Oliveira Klever F. Amaral Bruno S. Andrade Almir F. Kolias Angelos G. Paiva Wellingson S. 《Neurological sciences》2022,43(1):427-434
Neurological Sciences - Chronic subdural haematoma (CSDH) is one of the most common neurosurgical pathologies. The recurrence of chronic subdural haematomas is an important concern, considering... 相似文献
9.
10.
Zinc sulfate addition to glass-ionomer-based cements: influence on physical and antibacterial properties, zinc and fluoride release. 总被引:5,自引:0,他引:5
Prudencio W R Osinaga Rosa Helena M Grande Rafael Y Ballester Maria Regina L Simionato Célia Regina M Delgado Rodrigues Antonio Muench 《Dental materials》2003,19(3):212-217
OBJECTIVES: The aim of this study is to evaluate the effect of ZnSO(4) addition to a conventional glass ionomer and a resin-modified glass ionomer on solubility, flexural strength, zinc and fluoride (F) release, and Streptococcus mutans growth inhibition. METHODS: 5 or 10% ZnSO(4) was added to Vitremer and Ketac-Fil powders. Solubility test was performed based on ISO 7489. Flexural strength was determined by 3-point bending test based on ISO 4049. Zn release/uptake was determined by atomic emission spectrometry; F release/uptake was measured using a F-specific electrode. Both release measurements were performed for 15 d before and 15 d after recharging. Antibacterial test was conducted according to agar plate methods against S. mutans, by measuring the inhibition halos in 1-h and 15-d specimens. Data were analyzed by ANOVA. RESULTS: Solubility increased with higher ZnSO(4) content, but remained below the ISO 7489 limit. Flexural strength was not affected by ZnSO(4) addition, and Vitremer performed better than Ketac-Fil. The control materials released no zinc. Vitremer with 10% ZnSO(4) released the highest amount of zinc. Fluoride release was similar for Ketac-Fil and Vitremer. In both cases, the highest amounts were released in the first 24 h. The growth inhibition halo of S. mutans was similar for both materials with highest content of ZnSO(4) and occurred only with 1-h specimens. SIGNIFICANCE: Zinc addition decreased microorganisms growth and improved fluoride release, without significantly affecting the materials' flexural strength and solubility. 相似文献