全文获取类型
收费全文 | 239899篇 |
免费 | 38225篇 |
国内免费 | 2791篇 |
专业分类
耳鼻咽喉 | 6129篇 |
儿科学 | 7532篇 |
妇产科学 | 3717篇 |
基础医学 | 15233篇 |
口腔科学 | 3729篇 |
临床医学 | 35373篇 |
内科学 | 66676篇 |
皮肤病学 | 8783篇 |
神经病学 | 23401篇 |
特种医学 | 10013篇 |
外国民族医学 | 1篇 |
外科学 | 55644篇 |
综合类 | 1018篇 |
现状与发展 | 72篇 |
一般理论 | 194篇 |
预防医学 | 13206篇 |
眼科学 | 5094篇 |
药学 | 6665篇 |
中国医学 | 145篇 |
肿瘤学 | 18290篇 |
出版年
2024年 | 564篇 |
2023年 | 5343篇 |
2022年 | 2182篇 |
2021年 | 6166篇 |
2020年 | 7547篇 |
2019年 | 4844篇 |
2018年 | 10410篇 |
2017年 | 9453篇 |
2016年 | 10617篇 |
2015年 | 10945篇 |
2014年 | 18938篇 |
2013年 | 20207篇 |
2012年 | 12817篇 |
2011年 | 12906篇 |
2010年 | 14292篇 |
2009年 | 17550篇 |
2008年 | 11906篇 |
2007年 | 9947篇 |
2006年 | 12186篇 |
2005年 | 9429篇 |
2004年 | 8131篇 |
2003年 | 6707篇 |
2002年 | 6294篇 |
2001年 | 4303篇 |
2000年 | 3423篇 |
1999年 | 3802篇 |
1998年 | 4422篇 |
1997年 | 4084篇 |
1996年 | 3842篇 |
1995年 | 3688篇 |
1994年 | 2341篇 |
1993年 | 1974篇 |
1992年 | 1703篇 |
1991年 | 1706篇 |
1990年 | 1330篇 |
1989年 | 1441篇 |
1988年 | 1287篇 |
1987年 | 1101篇 |
1986年 | 1151篇 |
1985年 | 986篇 |
1984年 | 893篇 |
1983年 | 823篇 |
1982年 | 847篇 |
1981年 | 727篇 |
1980年 | 614篇 |
1979年 | 454篇 |
1978年 | 514篇 |
1977年 | 568篇 |
1975年 | 409篇 |
1972年 | 399篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
Daniel Schar Pawin Padungtod Nguyen Tung Michael OLeary Wantanee Kalpravidh Filip Claes 《Influenza and other respiratory viruses》2019,13(6):618-621
Among the chief limitations in achieving early detection and control of animal‐origin influenza of pandemic potential in high‐risk livestock populations is the existing lag time between sample collection and diagnostic result. Advances in molecular diagnostics are permitting deployment of affordable, rapid, highly sensitive, and specific point‐of‐capture assays, providing opportunities for targeted surveillance driving containment strategies with potentially compelling returns on investment. Interrupting disease transmission at source holds promise of disrupting cycles of animal‐origin influenza incursion to endemicity and limiting impact on animal production, food security, and public health. Adoption of new point‐of‐capture diagnostics should be undertaken in the context of promoting robust veterinary services systems and parallel support for operationalizing pre‐authorized plans and communication strategies that will ensure that the full potential of these new platforms is realized. 相似文献
24.
25.
26.
27.
28.
This article describes a case of anaphylaxis secondary to chlorhexidine during urethral catheterisation. Despite little evidence for the use of antiseptic lubricants in preventing catheter-associated urinary tract infections, the distribution and use of such products continues to be widespread. Chlorhexidine-free lubricating gel is widely available and should be used for urological procedures wherever possible. 相似文献
29.
Distribution of temperature changes and neurovascular coupling in rat brain following 3,4‐methylenedioxymethamphetamine (MDMA, “ecstasy”) exposure 下载免费PDF全文
Daniel Coman Basavaraju G. Sanganahalli Lihong Jiang Fahmeed Hyder Kevin L. Behar 《NMR in biomedicine》2015,28(10):1257-1266
(+/?)3,4‐methylenedioxymethamphetamine (MDMA, “ecstasy”) is an abused psychostimulant that produces strong monoaminergic stimulation and whole‐body hyperthermia. MDMA‐induced thermogenesis involves activation of uncoupling proteins (UCPs), primarily a type specific to skeletal muscle (UCP‐3) and absent from the brain, although other UCP types are expressed in the brain (e.g. thalamus) and might contribute to thermogenesis. Since neuroimaging of brain temperature could provide insights into MDMA action, we measured spatial distributions of systemically administered MDMA‐induced temperature changes and dynamics in rat cortex and subcortex using a novel magnetic resonance method, Biosensor Imaging of Redundant Deviation in Shifts (BIRDS), with an exogenous temperature‐sensitive probe (thulium ion and macrocyclic chelate 1,4,7,10‐tetraazacyclododecane‐1,4,7,10‐tetramethyl‐1,4,7,10‐tetraacetate (DOTMA4?)). The MDMA‐induced temperature rise was greater in the cortex than in the subcortex (1.6 ± 0.4 °C versus 1.3 ± 0.4 °C) and occurred more rapidly (2.0 ± 0.2 °C/h versus 1.5 ± 0.2 °C/h). MDMA‐induced temperature changes and dynamics in the cortex and body were correlated, although the body temperature exceeded the cortex temperature before and after MDMA. Temperature, neuronal activity, and blood flow (CBF) were measured simultaneously in the cortex and subcortex (i.e. thalamus) to investigate possible differences of MDMA‐induced warming across brain regions. MDMA‐induced warming correlated with increases in neuronal activity and blood flow in the cortex, suggesting that the normal neurovascular response to increased neural activity was maintained. In contrast to the cortex, a biphasic relationship was seen in the subcortex (i.e. thalamus), with a decline in CBF as temperature and neural activity rose, transitioning to a rise in CBF for temperature above 37 °C, suggesting that MDMA affected CBF and neurovascular coupling differently in subcortical regions. Considering that MDMA effects on CBF and heat dissipation (as well as potential heat generation) may vary regionally, neuroprotection may require different cooling strategies. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
30.