全文获取类型
收费全文 | 6422篇 |
免费 | 378篇 |
国内免费 | 62篇 |
专业分类
耳鼻咽喉 | 45篇 |
儿科学 | 190篇 |
妇产科学 | 142篇 |
基础医学 | 678篇 |
口腔科学 | 146篇 |
临床医学 | 489篇 |
内科学 | 1672篇 |
皮肤病学 | 128篇 |
神经病学 | 384篇 |
特种医学 | 382篇 |
外科学 | 1155篇 |
综合类 | 18篇 |
预防医学 | 214篇 |
眼科学 | 52篇 |
药学 | 296篇 |
中国医学 | 8篇 |
肿瘤学 | 863篇 |
出版年
2024年 | 6篇 |
2023年 | 86篇 |
2022年 | 59篇 |
2021年 | 249篇 |
2020年 | 155篇 |
2019年 | 218篇 |
2018年 | 273篇 |
2017年 | 169篇 |
2016年 | 195篇 |
2015年 | 201篇 |
2014年 | 311篇 |
2013年 | 359篇 |
2012年 | 509篇 |
2011年 | 522篇 |
2010年 | 286篇 |
2009年 | 254篇 |
2008年 | 408篇 |
2007年 | 391篇 |
2006年 | 348篇 |
2005年 | 410篇 |
2004年 | 346篇 |
2003年 | 313篇 |
2002年 | 264篇 |
2001年 | 42篇 |
2000年 | 37篇 |
1999年 | 40篇 |
1998年 | 64篇 |
1997年 | 48篇 |
1996年 | 41篇 |
1995年 | 32篇 |
1994年 | 29篇 |
1993年 | 24篇 |
1992年 | 18篇 |
1991年 | 20篇 |
1990年 | 24篇 |
1989年 | 13篇 |
1988年 | 15篇 |
1987年 | 10篇 |
1986年 | 15篇 |
1985年 | 6篇 |
1984年 | 8篇 |
1983年 | 4篇 |
1982年 | 6篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 3篇 |
1977年 | 4篇 |
1971年 | 2篇 |
1965年 | 2篇 |
1904年 | 2篇 |
排序方式: 共有6862条查询结果,搜索用时 31 毫秒
91.
92.
93.
94.
95.
Paola Saccomandi Emiliano Schena Francesco Giurazza Riccardo Del Vescovo Michele A. Caponero Luca Mortato Francesco Panzera Roberto L. Cazzato Francesco R. Grasso Francesco M. Di Matteo Sergio Silvestri Bruno B. Zobel 《Lasers in medical science》2014,29(2):607-614
Tissue temperature distribution plays a crucial role in the outcome of laser-induced thermotherapy (LITT), a technique employed for neoplasias removal. Since recent studies proposed LITT for pancreatic tumors treatment, assessment of temperature and of its effects around the laser applicator could be useful to define optimal laser settings. The aims of this work are temperature monitoring and measurement of ablated tissue volume in an ex vivo porcine pancreas undergoing double-applicator LITT. A three-dimensional numerical model is implemented to predict temperature rise and volumes of ablated tissue in treated pancreas. Experiments are performed to validate the model, with two modalities: (1) 12-fiber Bragg grating sensors are adopted to monitor the heating and cooling during LITT at several distances from the applicators tip, and (2) 1.5-T MR imaging is used to estimate the ablated volume. Experimental data agree with theoretical ones: at 2 mm from both applicators tips, the maximum temperature increase is approximately 60 °C downward from the tips, while it increases of about 40 °C and 30 °C, respectively, at the level and upward from the tips. This behavior occurs also at other distances, proving that the tissue downward from the tip is mostly heated. Furthermore, the estimated volume with MRI agrees with theoretical one (i.d., 0.91?±?0.09 vs. 0.95 cm3). The encouraging results indicate that the model could be a suitable tool to choose the optimal laser settings, in order to control the volume of ablated tissue. 相似文献
96.
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97.
Andrei Fodor Sara Broggi Elena Incerti Italo Dell’Oca Claudio Fiorino Ana M. Samanes Gajate Marcella Pasetti Mauro G. Cattaneo Paolo Passoni Luigi Gianolli Riccardo Calandrino Maria Picchio Nadia Di Muzio 《Clinical lung cancer》2019,20(1):e29-e38
Introduction
The objective of this study was to present the outcomes of moderately hypofractionated helical intensity-modulated radiation therapy (HT) with/without simultaneous integrated boost (SIB) on fluorodeoxyglucose-positron emission tomography (FDG-PET) positive areas (gross tumor volume [GTV]-PET) for patients with progressive malignant pleural mesothelioma (MPM) after previous treatments.Methods and Materials
From May 2006 to April 2014, 51 patients with a median age of 68.8 years (range, 38.6-82 years) were treated. There were 41 men and 10 women; 43 epithelioid MPM and 8 sarcomatoid, involving the left pleura in 25 patients and the right pleura in 26 patients. The initial stage was: I, 11 patients; II, 14 patients; III, 17 patients; and IV, 9 patients. Chemotherapy was prescribed for 46 patients, for 6 cycles (range, 0-18 cycles). Eighteen patients had pleurectomy/decortication, and 33 had talc pleurodesis. FDG-PET was used for target identification. A median dose of 56 Gy/25 fractions was prescribed to the involved pleura, and SIB to 62.5 Gy to GTV-PET was added in 38 patients.Results
The median survival from diagnosis was 25.8 months (range, 8.4-99.0 months). One patient, treated with SIB, was alive at the October 2017 follow-up. Two cases of grade 5 radiation pneumonitis were registered. A GTV-PET ≤ 205 cc was predictive of late ≥ grade 2 lung toxicity, but also of better survival in stage III and IV disease: 5.9 versus 11.7 months (P = .04). A GTV-PET ≥ 473 cc was predictive of early death (P = .001).Conclusions
Moderately hypofractionated, FDG-PET guided salvage HT in patients with progressive MPM after previous treatments showed acceptable toxicity and outcome results similar to adjuvant radiotherapy after pleurectomy/decortication, suggesting that the delay of radiotherapy is not detrimental to survival, and has the associated benefit of postponing inherent toxicity. 相似文献98.
Effects of a collagen membrane positioned between augmentation material and the sinus mucosa in the elevation of the maxillary sinus floor. An experimental study in sheep 下载免费PDF全文
99.
100.
Fabio Santanelli Gunnar Blomqvist Guido Paolini Riccardo Frati 《Journal of plastic surgery and hand surgery》2013,47(3):301-304
We report the follow-up of 47 patients with penile hypospadias who were treated by the Scuderi procedure between 1988 and 1998 at Sahlgrenska University Hospital, Göteborg, Sweden. Forty of the patients (85%) had had no previous operations, while the remaining seven had had meatotomy with chordectomy only, or an unsuccessful Dennis-Browne procedure. Hypospadias was distal in 35 (74%), mediopenile in 8 (17%), and proximal in 4 (9%); 21 (45%) showed signs of curvature. After a Scuderi urethroplasty one patient developed a fistula (2%) and 4 developed mild stenosis. The early success rate was therefore 42/47 (89%) and this later increased to 46/47 (98%) after non-surgical treatment of the stenoses. The results support the use of the Scuderi procedure for correction of primary and secondary penile hypospadias with a low complication rate. 相似文献