全文获取类型
收费全文 | 25045篇 |
免费 | 1727篇 |
国内免费 | 94篇 |
专业分类
耳鼻咽喉 | 313篇 |
儿科学 | 710篇 |
妇产科学 | 517篇 |
基础医学 | 3664篇 |
口腔科学 | 1893篇 |
临床医学 | 2409篇 |
内科学 | 4912篇 |
皮肤病学 | 475篇 |
神经病学 | 2318篇 |
特种医学 | 500篇 |
外科学 | 2473篇 |
综合类 | 141篇 |
一般理论 | 15篇 |
预防医学 | 3192篇 |
眼科学 | 287篇 |
药学 | 1658篇 |
中国医学 | 190篇 |
肿瘤学 | 1199篇 |
出版年
2023年 | 180篇 |
2022年 | 212篇 |
2021年 | 749篇 |
2020年 | 561篇 |
2019年 | 762篇 |
2018年 | 914篇 |
2017年 | 705篇 |
2016年 | 702篇 |
2015年 | 879篇 |
2014年 | 1097篇 |
2013年 | 1342篇 |
2012年 | 2014篇 |
2011年 | 2228篇 |
2010年 | 1178篇 |
2009年 | 923篇 |
2008年 | 1668篇 |
2007年 | 1659篇 |
2006年 | 1462篇 |
2005年 | 1344篇 |
2004年 | 1187篇 |
2003年 | 1046篇 |
2002年 | 935篇 |
2001年 | 314篇 |
2000年 | 293篇 |
1999年 | 270篇 |
1998年 | 144篇 |
1997年 | 112篇 |
1996年 | 99篇 |
1995年 | 119篇 |
1994年 | 110篇 |
1993年 | 76篇 |
1992年 | 124篇 |
1991年 | 124篇 |
1990年 | 87篇 |
1989年 | 98篇 |
1988年 | 78篇 |
1987年 | 68篇 |
1986年 | 67篇 |
1985年 | 70篇 |
1984年 | 53篇 |
1983年 | 79篇 |
1982年 | 62篇 |
1981年 | 55篇 |
1980年 | 63篇 |
1979年 | 42篇 |
1978年 | 38篇 |
1977年 | 34篇 |
1973年 | 30篇 |
1970年 | 24篇 |
1968年 | 35篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
61.
62.
Deepti Bettampadi Luisa L. Villa Eduardo L. Ponce Jorge Salmeron Bradley A. Sirak Martha Abrahamsen Julie A. Rathwell Richard R. Reich Anna R. Giuliano 《International journal of cancer. Journal international du cancer》2020,146(11):3026-3033
Incidence of human papillomavirus (HPV) attributable oropharyngeal cancers (OPCs) has been increasing globally, especially among men in high-income countries. There is a lack of studies comparing oral HPV prevalence by age and country among healthy men. The purpose of our study was to assess oral HPV prevalence by country and age. Participants of the HPV Infection in Men Study (HIM), a cohort of 3,098 healthy men from São Paulo, Brazil, Cuernavaca, Mexico and Tampa, USA, were studied. Oral HPV prevalence and type distribution were assessed using the SPF10 PCR-DEIA-LiPA25 system. The prevalence of any HPV in Brazil, Mexico and the US was 8.7% (95% CI: 7.1%, 10.4%), 10.0% (95% CI: 8.3%, 12.1%) and 7.6% (95% CI: 5.9%, 9.5%), respectively, while the prevalence of high-risk HPV was 5.3% (95% CI: 4.1%, 6.7%), 7.3% (95% CI: 5.7%, 9.0%) and 5.4% (95% CI: 4.0%, 7.0%), respectively. No significant differences in prevalence of grouped HPV types were observed by country despite significant differences in sexual behaviors. However, the age-specific prevalence of oral HPV differed by country. Brazilian (6.0% [95% CI: 3.4%, 9.7%]) and Mexican (9.2% [95% CI: 5.6%, 14.0%]) participants had peak high-risk HPV prevalence among men aged 41–50 years whereas the US participants had peak prevalence at ages 31–40 years (11.0% [95% CI: 6.4%, 17.3%]). In conclusion, oral HPV prevalence was low with no difference in overall prevalence observed by country. Factors associated with the differences in oral HPV age-patterning by country and sexual orientation require further study. 相似文献
63.
Esteves Georgia Rodrigues Junior Ivaldo Esteves Masson Igor Fagioli Bordello Machado Aline Fernanda Perez Oliveira Maria Carolina Derencio Baldan Cristiano Schiavinato Farcic Thiago Saikali Liebano Richard Eloin Plapler Hélio 《Lasers in medical science》2022,37(3):1495-1501
Lasers in Medical Science - The aim of this study was to investigate the effect of red laser (660 nm) photobiomodulation (PBM) with different energies on tumor necrosis factor-alpha(TNF-α)... 相似文献
64.
Talita da Silva Mendes de Farias Ariclécio Cunha de Oliveira Sandra Andreotti Fernanda Gaspar do Amaral Patrícia Chimin André Ricardo Alves de Proença Francisco Leonardo Torres Leal Rogério Antonio Laurato Sertié Amanda Baron Campana Andressa Bolsoni Lopes Arnaldo Henrique de Souza José Cipolla‐Neto Fabio Bessa Lima 《Journal of pineal research》2015,58(3):251-261
Melatonin, the main hormone produced by the pineal gland, is secreted in a circadian manner (24‐hr period), and its oscillation influences several circadian biological rhythms, such as the regulation of clock genes expression (chronobiotic effect) and the modulation of several endocrine functions in peripheral tissues. Assuming that the circadian synchronization of clock genes can play a role in the regulation of energy metabolism and it is influenced by melatonin, our study was designed to assess possible alterations as a consequence of melatonin absence on the circadian expression of clock genes in the epididymal adipose tissue of male Wistar rats and the possible metabolic repercussions to this tissue. Our data show that pinealectomy indeed has impacts on molecular events: it abolishes the daily pattern of the expression of Clock, Per2, and Cry1 clock genes and Pparγ expression, significantly increases the amplitude of daily expression of Rev‐erbα, and affects the pattern of and impairs adipokine production, leading to a decrease in leptin levels. However, regarding some metabolic aspects of adipocyte functions, such as its ability to synthesize triacylglycerols from glucose along 24 hr, was not compromised by pinealectomy, although the daily profile of the lipogenic enzymes expression (ATP‐citrate lyase, malic enzyme, fatty acid synthase, and glucose‐6‐phosphate dehydrogenase) was abolished in pinealectomized animals. 相似文献
65.
66.
67.
Prevalence of Left Ventricular Dyssynchrony in Patients with Congenital Atrioventricular Block and Long‐Term Pacing: A Three‐Dimensional Echocardiographic Study 下载免费PDF全文
68.
Luís A. Bastião Silva Luís S. Ribeiro Milton Santos Nuno Neves Dulce Francisco Carlos Costa José Luis Oliveira 《Journal of digital imaging》2015,28(6):671-683
The production of medical imaging is a continuing trend in healthcare institutions. Quality assurance for planned radiation exposure situations (e.g. X-ray, computer tomography) requires examination-specific set-ups according to several parameters, such as patient’s age and weight, body region and clinical indication. These data are normally stored in several formats and with different nomenclatures, which hinder the continuous and automatic monitoring of these indicators and the comparison between several institutions and equipment. This article proposes a framework that aggregates, normalizes and provides different views over collected indicators. The developed tool can be used to improve the quality of radiologic procedures and also for benchmarking and auditing purposes. Finally, a case study and several experimental results related to radiation exposure and productivity are presented and discussed. 相似文献
69.
70.
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