全文获取类型
收费全文 | 80363篇 |
免费 | 5862篇 |
国内免费 | 256篇 |
专业分类
耳鼻咽喉 | 995篇 |
儿科学 | 2091篇 |
妇产科学 | 1105篇 |
基础医学 | 10815篇 |
口腔科学 | 851篇 |
临床医学 | 8485篇 |
内科学 | 17235篇 |
皮肤病学 | 998篇 |
神经病学 | 7816篇 |
特种医学 | 3074篇 |
外国民族医学 | 9篇 |
外科学 | 12889篇 |
综合类 | 889篇 |
一般理论 | 91篇 |
预防医学 | 6023篇 |
眼科学 | 1967篇 |
药学 | 5386篇 |
中国医学 | 94篇 |
肿瘤学 | 5668篇 |
出版年
2023年 | 668篇 |
2022年 | 1041篇 |
2021年 | 2427篇 |
2020年 | 1362篇 |
2019年 | 2220篇 |
2018年 | 2540篇 |
2017年 | 1810篇 |
2016年 | 1904篇 |
2015年 | 2221篇 |
2014年 | 3229篇 |
2013年 | 4091篇 |
2012年 | 6536篇 |
2011年 | 6780篇 |
2010年 | 3724篇 |
2009年 | 3259篇 |
2008年 | 5422篇 |
2007年 | 5617篇 |
2006年 | 5207篇 |
2005年 | 5163篇 |
2004年 | 4656篇 |
2003年 | 4270篇 |
2002年 | 3878篇 |
2001年 | 623篇 |
2000年 | 432篇 |
1999年 | 607篇 |
1998年 | 791篇 |
1997年 | 597篇 |
1996年 | 481篇 |
1995年 | 429篇 |
1994年 | 401篇 |
1993年 | 399篇 |
1992年 | 290篇 |
1991年 | 217篇 |
1990年 | 211篇 |
1989年 | 186篇 |
1988年 | 179篇 |
1987年 | 141篇 |
1986年 | 155篇 |
1985年 | 163篇 |
1984年 | 186篇 |
1983年 | 157篇 |
1982年 | 243篇 |
1981年 | 236篇 |
1980年 | 165篇 |
1979年 | 101篇 |
1978年 | 125篇 |
1977年 | 102篇 |
1976年 | 75篇 |
1975年 | 63篇 |
1974年 | 65篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Ekaterina Lukianova-Hleb Sarah Bezek Reka Szigeti Alexander Khodarev Thomas Kelley Andrew Hurrell Michail Berba Nirbhay Kumar Umberto D’Alessandro Dmitri Lapotko 《Emerging infectious diseases》2015,21(7):1122-1127
A fast, precise, noninvasive, high-throughput, and simple approach for detecting malaria in humans and mosquitoes is not possible with current techniques that depend on blood sampling, reagents, facilities, tedious procedures, and trained personnel. We designed a device for rapid (20-second) noninvasive diagnosis of Plasmodium falciparum infection in a malaria patient without drawing blood or using any reagent. This method uses transdermal optical excitation and acoustic detection of vapor nanobubbles around intraparasite hemozoin. The same device also identified individual malaria parasite–infected Anopheles mosquitoes in a few seconds and can be realized as a low-cost universal tool for clinical and field diagnoses. 相似文献
992.
Andrew M. Ryan Stephen M. Shortell Patricia P. Ramsay Lawrence P. Casalino 《Annals of family medicine》2015,13(4):321-324
BACKGROUNDThe accountable care organization (ACO) is a new organizational form to manage patients across the continuum of care. There are numerous questions about how ACOs should be optimally structured, including compensation arrangements with primary care physicians.METHODSUsing data from a national survey of physician practices, we compared primary care physicians’ compensation between practices in ACOs and practices that varied in their financial risk for primary care costs using 3 groups: practices not participating in a Medicare ACO and with no substantial risk for primary care costs; practices not participating in an ACO but with substantial risk for primary care costs; and practices participating in an ACO regardless of their risk for primary care costs. We measured physicians’ compensation as the percentage of compensation based on salary, productivity, clinical quality or patient experience, and other factors. Regression models estimated physician compensation as a function of ACO participation and risk for primary care costs while controlling for other practice characteristics.RESULTSPhysicians in ACO and non-ACO practices with no substantial risk for costs on average received nearly one-half of their compensation from salary, slightly less from productivity, and about 5% from quality and other factors. Physicians not in ACOs but with substantial risk for primary care costs received two-thirds of their compensation from salary, nearly one-third from productivity, and slightly more than 1% from quality and other factors. Participation in ACOs was associated with significantly higher physician compensation for quality; however, participation was not significantly associated with compensation from salary, whereas financial risk was associated with much greater compensation from salary.CONCLUSIONAlthough practices in ACOs provide higher compensation for quality, compared with practices at large, they provide a similar mix of compensation based on productivity and salary. Incentives for ACOs may not be sufficiently strong to encourage practices to change physician compensation policies for better patient experience, improved population health, and lower per capita costs. 相似文献
993.
994.
Reduced memory skills and increased hair cortisol levels in recent Ecstasy/MDMA users: significant but independent neurocognitive and neurohormonal deficits 下载免费PDF全文
995.
James W Murrough Katherine E Burdick Cara F Levitch Andrew M Perez Jess W Brallier Lee C Chang Alexandra Foulkes Dennis S Charney Sanjay J Mathew Dan V Iosifescu 《Neuropsychopharmacology》2015,40(5):1084-1090
The glutamate N-methyl-D-aspartate (NMDA) receptor antagonist ketamine displays rapid antidepressant effects in patients with treatment-resistant depression (TRD); however, the potential for adverse neurocognitive effects in this population has not received adequate study. The current study was designed to investigate the delayed neurocognitive impact of ketamine in TRD and examine baseline antidepressant response predictors in the context of a randomized controlled trial. In the current study, 62 patients (mean age=46.2±12.2) with TRD free of concomitant antidepressant medication underwent neurocognitive assessments using components of the MATRICS Consensus Cognitive Battery (MCCB) before and after a single intravenous infusion of ketamine (0.5 mg/kg) or midazolam (0.045 mg/kg). Participants were randomized to ketamine or midazolam in a 2:1 fashion under double-blind conditions and underwent depression symptom assessments at 24, 48, 72 h, and 7 days post treatment using the Montgomery–Asberg Depression Rating Scale (MADRS). Post-treatment neurocognitive assessment was conducted once at 7 days. Neurocognitive performance improved following the treatment regardless of treatment condition. There was no differential effect of treatment on neurocognitive performance and no association with antidepressant response. Slower processing speed at baseline uniquely predicted greater improvement in depression at 24 h following ketamine (t=2.3, p=0.027), while controlling for age, depression severity, and performance on other neurocognitive domains. In the current study, we found that ketamine was devoid of adverse neurocognitive effects at 7 days post treatment and that slower baseline processing speed was associated with greater antidepressant response. Future studies are required to further define the neurocognitive profile of ketamine in clinical samples and to identify clinically useful response moderators. 相似文献
996.
997.
Koh Ming-Yi Toh Keith Zhi-Xian Ho Jamie Sin-Ying Yeo Leonard Leong-Litt Ho Andrew Fu-Wah Sia Ching-Hui Tan Benjamin Yong-Qiang 《Journal of thrombosis and thrombolysis》2022,54(2):339-349
Journal of Thrombosis and Thrombolysis - Patients with Moyamoya disease (MMD) can present with ischaemic or haemorrhagic stroke. There is no good evidence for treatment strategies in MMD-associated... 相似文献
998.
Virk Zain M. Song Andrew B. Badran Yousef R. Al-Samkari Hanny 《Journal of thrombosis and thrombolysis》2022,54(2):255-259
Journal of Thrombosis and Thrombolysis - Heyde syndrome is characterized by the co-occurrence of aortic stenosis and bleeding gastrointestinal angiodysplasias, often with acquired von Willebrand... 相似文献
999.
Kawakubo Kazumichi Castillo Carlos Fernandez-del Liss Andrew Scott 《Journal of gastroenterology》2022,57(11):819-826
Journal of Gastroenterology - Pancreatic adenocarcinoma is a lethal cancer with poor response to chemotherapy and immune checkpoint inhibitors. Recent studies suggest that epigenetic alterations... 相似文献
1000.
Sumpton Daniel Hannan Elyssa Kelly Ayano Tunnicliffe David Ming Andrew Hassett Geraldine Craig Jonathan C Tong Allison 《Clinical rheumatology》2021,40(4):1369-1380
Clinical Rheumatology - Shared care between rheumatologists and dermatologists is advocated for patients with psoriasis and psoriatic arthritis, but care provided by rheumatologists and... 相似文献