全文获取类型
收费全文 | 1470篇 |
免费 | 110篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 21篇 |
儿科学 | 51篇 |
妇产科学 | 34篇 |
基础医学 | 237篇 |
口腔科学 | 86篇 |
临床医学 | 162篇 |
内科学 | 282篇 |
皮肤病学 | 12篇 |
神经病学 | 187篇 |
特种医学 | 23篇 |
外科学 | 88篇 |
综合类 | 15篇 |
预防医学 | 125篇 |
眼科学 | 28篇 |
药学 | 76篇 |
中国医学 | 5篇 |
肿瘤学 | 158篇 |
出版年
2023年 | 23篇 |
2022年 | 37篇 |
2021年 | 76篇 |
2020年 | 29篇 |
2019年 | 41篇 |
2018年 | 48篇 |
2017年 | 37篇 |
2016年 | 54篇 |
2015年 | 48篇 |
2014年 | 62篇 |
2013年 | 87篇 |
2012年 | 146篇 |
2011年 | 137篇 |
2010年 | 72篇 |
2009年 | 50篇 |
2008年 | 84篇 |
2007年 | 78篇 |
2006年 | 84篇 |
2005年 | 88篇 |
2004年 | 76篇 |
2003年 | 70篇 |
2002年 | 54篇 |
2001年 | 6篇 |
2000年 | 2篇 |
1999年 | 8篇 |
1998年 | 9篇 |
1997年 | 2篇 |
1996年 | 9篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1977年 | 6篇 |
1976年 | 4篇 |
1975年 | 5篇 |
1974年 | 3篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 4篇 |
1970年 | 3篇 |
1965年 | 1篇 |
1944年 | 1篇 |
1942年 | 1篇 |
排序方式: 共有1590条查询结果,搜索用时 31 毫秒
71.
Formánek Martin Walderová Radana Baníková Šárka Chmelová Irina Formánková Debora Zeleník Karol Komínek Pavel 《European archives of oto-rhino-laryngology》2020,277(3):933-938
European Archives of Oto-Rhino-Laryngology - Electrical stimulation-supported therapy is an often used modality. However, it still belongs to experimental methods in the human larynx. Data are... 相似文献
72.
73.
Ferran Poveda Debora Gil Enric Martí Albert Andaluz Manel Ballester Francesc Carreras 《Revista espa?ola de cardiología》2013,66(10):782-790
Introduction and objectives
Deeper understanding of the myocardial structure linking the morphology and function of the heart would unravel crucial knowledge for medical and surgical clinical procedures and studies. Several conceptual models of myocardial fiber organization have been proposed but the lack of an automatic and objective methodology prevented an agreement. We sought to deepen this knowledge through advanced computer graphical representations of the myocardial fiber architecture by diffusion tensor magnetic resonance imaging.Methods
We performed automatic tractography reconstruction of unsegmented diffusion tensor magnetic resonance imaging datasets of canine heart from the public database of the Johns Hopkins University. Full-scale tractographies have been built with 200 seeds and are composed by streamlines computed on the vector field of primary eigenvectors at the diffusion tensor volumes. We also introduced a novel multiscale visualization technique in order to obtain a simplified tractography. This methodology retains the main geometric features of the fiber tracts, making it easier to decipher the main properties of the architectural organization of the heart.Results
Output analysis of our tractographic representations showed exact correlation with low-level details of myocardial architecture, but also with the more abstract conceptualization of a continuous helical ventricular myocardial fiber array.Conclusions
Objective analysis of myocardial architecture by an automated method, including the entire myocardium and using several 3-dimensional levels of complexity, reveals a continuous helical myocardial fiber arrangement of both right and left ventricles, supporting the anatomical model of the helical ventricular myocardial band described by F. Torrent-Guasp. 相似文献74.
Fagone E Conte E Gili E Fruciano M Pistorio MP Lo Furno D Giuffrida R Crimi N Vancheri C 《Experimental lung research》2011,37(3):162-174
The authors investigated the role of resveratrol (RV), a natural poliphenolic molecule with several biological activities, in transforming growth factor-β (TGF-β)-induced proliferation and differentiation of ex vivo human pulmonary fibroblasts into myofibroblasts. The effects of RV treatment were evaluated by analyzing TGF-β-induced α-smooth muscle actin (α-SMA) expression and collagen production, as well as cell proliferation of both normal and idiopathic pulmonary fibrosis (IPF) lung fibroblasts. Results demonstrate that RV inhibits TGF-β-induced cell proliferation of both normal and pathological lung fibroblasts, attenuates α-SMA expression at both the mRNA and protein levels, and also inhibits intracellular collagen deposition. In order to understand the molecular mechanisms, the authors also investigated the effects of RV treatment on signaling pathways involved in TGF-β-induced fibrosis. The authors show that RV inhibited TGF-β-induced phosphorylation of both extracellular signal-regulated kinases (ERK1/2) and the serine/threonine kinase, Akt. Moreover, RV treatment blocked the TGF-β-induced decrease in phosphatase and tensin homolog (PTEN) expression levels. 相似文献
75.
Silva Sara Pereira Beserra-Filho José Ivo Araújo Kubota Melina Chiemi Cardoso Gabriela Nascimento Freitas Francisca Rayanne Silva Gonçalves Bianca Santos Martins Vicente-Silva Wilson Silva-Martins Suellen Custódio-Silva Ana Claúdia Soares-Silva Beatriz Maria-Macêdo Amanda Santos José Ronaldo Estadella Debora Ribeiro Alessandra Mussi 《Metabolic brain disease》2021,36(7):1717-1727
Metabolic Brain Disease - Worldwide, the excessive consumption of fat and/or sugar has increased considerably. Palatable high-fat diets (HFDs) lead to metabolic disturbances and obesity,... 相似文献
76.
SMARCA4 inactivating mutations cause concomitant Coffin–Siris syndrome,microphthalmia and small‐cell carcinoma of the ovary hypercalcaemic type 下载免费PDF全文
77.
Camila Leonel Thaiz Ferraz Borin Lívia de Carvalho Ferreira Marina Gobbe Moschetta Marcio Chaim Bajgelman Alicia M. Viloria-Petit Debora Aparecida Pires de Campos Zuccari 《Journal of mammary gland biology and neoplasia》2017,22(1):27-41
Epithelial mesenchymal transition (EMT) is a process by which epithelial cells acquire mesenchymal properties, generating metastases. Transforming growth factor beta (TGF-β) is associated with this malignancy by having the ability to induce EMT. Metformin, has been shown to inhibit EMT in breast cancer cells. Based on this evidence we hypothesize that treatment with metformin and the silencing of TGF-β, inhibits the EMT in cancer cells. Canine metastatic mammary tumor cell line CF41 was stably transduced with a shRNA-lentivirus, reducing expression level of TGF-β1. This was combined with metformin treatment, to look at effects on cell migration and the expression of EMT markers. For in vivo study, unmodified or TGF-β1sh cells were injected in the inguinal region of nude athymic female mice followed by metformin treatment. The mice’s lungs were collected and metastatic nodules were subsequently assessed for EMT markers expression. The migration rate was lower in TGF-β1sh cells and when combined with metformin treatment. Metformin treatment reduced N-cadherin and increased E-cadherin expression in both CF41 and TGF-β1sh cells. Was demonstrated that metformin treatment reduced the number of lung metastases in animals bearing TGF-β1sh tumors. This paralleled a decreased N-cadherin and vimentin expression, and increased E-cadherin and claudin-7 expression in lung metastases. This study confirms the benefits of TGF-β1 silencing in addition to metformin as potential therapeutic agents for breast cancer patients, by blocking EMT process. To the best of our knowledge, we are the first to report metformin treatment in cells with TGF-β1 silencing and their effect on EMT. 相似文献
78.
Yael Manor Rajshree Mootanah Debora Freud Nir Giladi Jacob T. Cohen 《Parkinsonism & related disorders》2013,19(2):207-211
BackgroundConventional swallowing therapy for patients with Parkinson's disease (PD) and swallowing difficulties has poor carryover to everyday life. Herein, we test the effectiveness of visual information while treating swallowing disturbances in patients with PD.MethodsForty two non-demented PD patients with swallowing disturbances were randomly divided into two groups. An experimental group received video-assisted swallowing therapy (VAST) and a control group (n = 21) was given conventional therapy. Both groups were given 6 interventional sessions by the same speech and swallowing therapist. Patients in the VAST group were exposed to video of the swallowing process in general as well as of their own, as part of all therapy sessions. Swallowing function was assessed before and post-intervention by fiberoptic endoscopic evaluation of swallowing (FEES). Quality of life, quality of care and the degree of pleasure from eating were also assessed by questioners pre and post-intervention.ResultsThere was a significant improvement in swallowing functions following both interventions. The FEESs demonstrated a significantly greater reduction in food residues in the pharynx in the VAST group compared to the conventional treatment group. There were significant group improvement in some parameters of the quality of life, quality of care and pleasure of eating scales.ConclusionIn cognitively intact patients with PD with swallowing disturbances VAST was associated with improved swallowing related QOL and less food residues in the pharynx. 相似文献
79.
ABSTRACT: BACKGROUND: The purpose of the study is to describe the impact of oral health-related quality of life (OHRQoL) on the lives of pre-seniors and seniors living in Nova Scotia, Canada. METHODS: This cross-sectional study involved 1461 participants, grouped by age (pre-seniors [45-64] and seniors [65+]) and residential status (long-term care facility [LTC] or community). OHRQoL was measured using the 14-item Oral Health Impact Profile questionnaire (OHIP-14) in a random digit dialing telephone survey (for community residents) or a face-to-face interview (for LTC residents). Intra-oral examinations were performed by one of six dentists calibrated to W.H.O. standards. RESULTS: Approximately one in four pre-seniors and seniors reported at least one OHRQoL impact 'fairly/very often'. The most commonly reported impacts were within the dimensions 'physical pain' and 'psychological discomfort'. It was found that 12.2% of LTC residents found it uncomfortable to eat any foods 'fairly/very' often compared to 7.7% in the community, and 11.6% of LTC residents reported being self-conscious 'fairly/very often' compared to 8.2% in the community. Of those residing in the community, pre-seniors (28.8%) reported significantly more impacts than seniors (22.0%); but there were no significant differences in OHRQoL between pre-seniors (21.2%) and seniors (25.3%) in LTC. Pre-seniors living in the community scored significantly higher than community dwelling seniors on prevalence, extent and severity of OHIP-14 scores. Logistic regression revealed that for the community dwelling sample, individuals living in rural areas in addition to those being born outside of Canada were approximately 2.0 times more likely to report an impact 'fairly/very often', whereas among the LTC sample, those having a high school education or less were 2.3 times more likely to report an impact. CONCLUSIONS: Findings indicate that the oral health and OHRQoL of both pre-seniors and seniors in LTC residents is poor. Community dwelling pre-seniors have the highest prevalence rate of oral impacts. 相似文献
80.