全文获取类型
收费全文 | 5694篇 |
免费 | 336篇 |
国内免费 | 74篇 |
专业分类
耳鼻咽喉 | 97篇 |
儿科学 | 74篇 |
妇产科学 | 87篇 |
基础医学 | 593篇 |
口腔科学 | 190篇 |
临床医学 | 535篇 |
内科学 | 1516篇 |
皮肤病学 | 54篇 |
神经病学 | 736篇 |
特种医学 | 280篇 |
外科学 | 930篇 |
综合类 | 5篇 |
预防医学 | 213篇 |
眼科学 | 59篇 |
药学 | 286篇 |
中国医学 | 8篇 |
肿瘤学 | 441篇 |
出版年
2024年 | 14篇 |
2023年 | 102篇 |
2022年 | 185篇 |
2021年 | 300篇 |
2020年 | 220篇 |
2019年 | 235篇 |
2018年 | 249篇 |
2017年 | 156篇 |
2016年 | 226篇 |
2015年 | 244篇 |
2014年 | 282篇 |
2013年 | 359篇 |
2012年 | 511篇 |
2011年 | 484篇 |
2010年 | 266篇 |
2009年 | 232篇 |
2008年 | 298篇 |
2007年 | 324篇 |
2006年 | 267篇 |
2005年 | 248篇 |
2004年 | 240篇 |
2003年 | 207篇 |
2002年 | 147篇 |
2001年 | 32篇 |
2000年 | 21篇 |
1999年 | 27篇 |
1998年 | 37篇 |
1997年 | 30篇 |
1996年 | 24篇 |
1995年 | 18篇 |
1994年 | 16篇 |
1993年 | 14篇 |
1992年 | 16篇 |
1991年 | 11篇 |
1990年 | 13篇 |
1989年 | 4篇 |
1988年 | 8篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1978年 | 2篇 |
1973年 | 3篇 |
1962年 | 1篇 |
1961年 | 1篇 |
1957年 | 1篇 |
1940年 | 1篇 |
1905年 | 1篇 |
排序方式: 共有6104条查询结果,搜索用时 15 毫秒
91.
92.
Nicole Corsi Mehran Emadi Andani Davide Sometti Michele Tinazzi Mirta Fiorio 《The European journal of neuroscience》2019,50(8):3311-3326
Perception and behavior are strongly influenced by the verbal information conveyed by other individuals (e.g., verbal suggestion) and by learning (e.g., conditioning). This influence is well represented by the placebo and nocebo effects, in which positive verbal suggestion associated with positive conditioning induces beneficial outcomes (placebo effect), while the opposite is true for the negative counterpart (nocebo effect). It is still unclear whether verbal suggestion and conditioning exert distinctive roles in influencing perception, behavior and motor system activity when they occur in opposite directions. To this purpose, fifty‐three healthy volunteers were assigned to four groups characterized by either congruent or incongruent verbal suggestion and conditioning. Participants were asked to perform a force motor task by pressing a piston as strongly as possible. Transcranial magnetic stimulation over the primary motor cortex was used to record motor evoked potentials (MEP) and cortical silent period (CSP) from the muscle involved in the task. We found that negative verbal suggestion counteracted positive conditioning and induced sense of weakness, effort, and force decrements. MEP amplitude was stable, whereas the CSP duration shortened in all the groups throughout the procedure, indicating the involvement of cortical inhibitory circuits, independently of the type of verbal suggestion or conditioning. Our findings highlight a prevalent role of verbal suggestion over conditioning in determining a worsening (nocebo effect) but not an improvement (placebo effect) of motor performance. These results suggest that words associated with treatments should be chosen carefully to avoid negative outcomes, especially in sports and clinical settings. 相似文献
93.
94.
Martina Giovannella Bjrn Andresen Julie B Andersen Sahla El-Mahdaoui Davide Contini Lorenzo Spinelli Alessandro Torricelli Gorm Greisen Turgut Durduran Udo M Weigel Ian Law 《Journal of cerebral blood flow and metabolism》2020,40(10):2055
Diffuse correlation spectroscopy (DCS) can non-invasively and continuously asses regional cerebral blood flow (rCBF) at the cot-side by measuring a blood flow index (BFI) in non-traditional units of cm2/s. We have validated DCS against positron emission tomography using 15O-labeled water (15O-water PET) in a piglet model allowing us to derive a conversion formula for BFI to rCBF in conventional units (ml/100g/min). Neonatal piglets were continuously monitored by the BabyLux device integrating DCS and time resolved near infrared spectroscopy (TRS) while acquiring 15O-water PET scans at baseline, after injection of acetazolamide and during induced hypoxic episodes. BFI by DCS was highly correlated with rCBF (R = 0.94, p < 0.001) by PET. A scaling factor of 0.89 (limits of agreement for individual measurement: 0.56, 1.39)×109× (ml/100g/min)/(cm2/s) was used to derive baseline rCBF from baseline BFI measurements of another group of piglets and of healthy newborn infants showing an agreement with expected values. These results pave the way towards non-invasive, cot-side absolute CBF measurements by DCS on neonates. 相似文献
95.
Federico Cagnazzo Pierre-Henri Lefevre Daniel Mantilla Aymeric Rouchaud Riccardo Morganti Paolo Perrini Davide Di Carlo Cyril Dargazanli Gregory Gascou Carlos Riquelme Alain Bonafe Vincent Costalat 《Journal of neuroradiology. Journal de neuroradiologie》2019,46(1):9-14
Background and purpose
Placement of flow-diverters across the ostia of major ICA branches carries a risk of arterial occlusion. We determined the rate of occlusion of the supraclinoid ICA branches and the related symptoms, following coverage with flow-diverters.Materials and methods
A systematic search was performed in PubMed, MEDLINE, and EMBASE. We selected studies reporting treatments with flow-diverters in which the device was placed across the ostium of the OphtA, PcomA, or AchorA. Random-effects meta-analysis was used to pool the following outcomes: rate of arterial occlusion, diminished flow, incidence of related symptoms, factors associated with arterial occlusion.Result
Twenty-one studies evaluating 1152 supraclinoid ICA branches were included in the meta-analysis. The incidence of OphtA occlusion and associated symptoms was 5.9% (95 CI%?=?3.1–8.6%) (incidence rate?=?6% per patient-year), and 0.8% (95% CI?=?0.1–1.4%) (incidence rate?=?0.8% per patient-year), respectively. Although asymptomatic in all cases, PcomA showed a higher occlusion rate (20.7%, 95% CI?=?8.9–32.4%) (incidence rate?=?19.5% per patient-year). AchorA was occluded in 1% (95% CI?=?0.3–2.4%) of cases, with approximately 1% (95% CI?=?0.4–2.3%) of transient neurological symptoms (incidence rate?=?0.96% per patient-year). There was a trend toward higher odds of arterial patency among arteries arising from the aneurysm (OR?=?2.94, P?=?0.06). Demographic factors and multiple stents were not associated with higher risk of arterial impairment. Adequate collateral circulation was reported in 94.5% of patients with arterial occlusion.Conclusions
During aneurysm treatment, the ostium of the supraclinoid ICA branches can be covered with flow-diverter devices with low rates of neurological symptoms related to arterial occlusion. 相似文献96.
97.
98.
Titolo Paolo Fusini Federico Arrigoni Chiara Isoardo Gianluca Conforti Luigi Artiaco Stefano Ciclamini Davide Sicari Monica Battiston Bruno 《European journal of orthopaedic surgery & traumatology : orthopedie traumatologie》2019,29(3):521-530
European Journal of Orthopaedic Surgery & Traumatology - Spinal cord injury (SCI) is very common, most frequently resulting from motor vehicle accidents and falling from a height. Often, SCI... 相似文献
99.
Davide Giordano Alessandro Panini Carmine Pernice Maria Gabriella Raso Verter Barbieri 《American journal of otolaryngology》2014
Lidocaine is commonly used for topical anesthesia of the upper airway in patient with anticipated difficult tracheal intubation undergoing awake fiberoptic intubation. Lidocaine toxicity is dose related and proportional to its plasma level. Although neurologic toxicity has been frequently observed with intravenous use, it has also been reported for topical use. 相似文献