全文获取类型
收费全文 | 29273篇 |
免费 | 1416篇 |
国内免费 | 195篇 |
专业分类
耳鼻咽喉 | 318篇 |
儿科学 | 544篇 |
妇产科学 | 705篇 |
基础医学 | 3386篇 |
口腔科学 | 1522篇 |
临床医学 | 2231篇 |
内科学 | 7864篇 |
皮肤病学 | 444篇 |
神经病学 | 2726篇 |
特种医学 | 1183篇 |
外科学 | 4227篇 |
综合类 | 113篇 |
一般理论 | 7篇 |
预防医学 | 1531篇 |
眼科学 | 432篇 |
药学 | 1609篇 |
中国医学 | 118篇 |
肿瘤学 | 1924篇 |
出版年
2023年 | 162篇 |
2022年 | 273篇 |
2021年 | 802篇 |
2020年 | 456篇 |
2019年 | 632篇 |
2018年 | 819篇 |
2017年 | 574篇 |
2016年 | 698篇 |
2015年 | 804篇 |
2014年 | 1106篇 |
2013年 | 1491篇 |
2012年 | 2280篇 |
2011年 | 2447篇 |
2010年 | 1408篇 |
2009年 | 1255篇 |
2008年 | 2128篇 |
2007年 | 2188篇 |
2006年 | 2013篇 |
2005年 | 2021篇 |
2004年 | 1796篇 |
2003年 | 1554篇 |
2002年 | 1448篇 |
2001年 | 187篇 |
2000年 | 128篇 |
1999年 | 176篇 |
1998年 | 241篇 |
1997年 | 192篇 |
1996年 | 185篇 |
1995年 | 147篇 |
1994年 | 133篇 |
1993年 | 91篇 |
1992年 | 92篇 |
1991年 | 86篇 |
1990年 | 71篇 |
1989年 | 70篇 |
1988年 | 70篇 |
1987年 | 54篇 |
1986年 | 50篇 |
1985年 | 42篇 |
1984年 | 84篇 |
1983年 | 54篇 |
1982年 | 72篇 |
1981年 | 45篇 |
1980年 | 27篇 |
1979年 | 24篇 |
1978年 | 26篇 |
1977年 | 30篇 |
1976年 | 21篇 |
1974年 | 16篇 |
1973年 | 22篇 |
排序方式: 共有10000条查询结果,搜索用时 390 毫秒
971.
972.
Benedetta Miglino MD Rossana Tiberio MD Stefano Astolfi MD Francesca Graziola MD Paolo Boggio MD Monica Leutner MD Guido Valente MD Roberto Franchini MD Enrico Colombo MD 《The breast journal》2016,22(3):339-341
Basal cell carcinoma (BCC) is a common skin cancer worldwide. However, BCC of the nipple and areola complex is rare. Men are more affected than women. Most of the cases were treated with simple excision. We report a case of BCC of the right nipple–areola complex in a 75‐year‐old man, treated with Mohs surgery and simple mastectomy. 相似文献
973.
974.
975.
976.
Functional changes are associated with tracheal structural abnormalities in patients with acromegaly
Gustavo Bittencourt Camilo Fernando Silva Guimar?es Roberto Mogami Alvaro Camilo Dias Faria Pedro Lopes Melo Agnaldo José Lopes 《Archives of Medical Science》2016,12(1):78-88
Introduction
Although impaired pulmonary function and respiratory sleep disorders are described as responsible for increased mortality in acromegalic patients, little is known about the tracheal abnormalities in this group of patients. Thus, the objectives of this study were to describe the tracheal structural abnormalities and correlate these changes with the respiratory function and clinical data of acromegalic patients.Material and methods
This is a cross-sectional study that was carried out at two university hospitals. Twenty acromegalic patients underwent spirometry, forced oscillation technique, and computed tomography (CT) assessments. Dyspnea and daytime sleepiness were assessed using the Modified Medical Research Council (MMRC) scale and the Epworth Sleepiness Scale (ESS), respectively. Forty matched subjects served as controls.Results
The acromegalic patients exhibited larger median ratios between forced expiratory flow and forced inspiratory flow at 50% of the forced vital capacity (FEF50%/FIF50%) (2.05 vs. 1.06, p = 0.0001) compared with healthy volunteers. In the CT analysis, acromegalic patients exhibited larger median differences between their cervical and thoracic tracheal diameters (Δ tracheal diameters) (3 vs. 1 mm; p = 0.003). An association was found between FEF50%/FIF50% and the following variables: mean resistance (Rm), cervical tracheal diameter, and Δ tracheal diameters. Rm also exhibited a negative correlation with cervical tracheal diameter. Neither the MMRC scale nor the ESS exhibited any significant correlation with large airway obstruction (LAO) indices or with the measured tracheal diameters.Conclusions
Acromegalic patients have tracheal structural abnormalities which are associated with functional indicators of LAO but not with clinical data. 相似文献977.
Retrospective cohort study of prognostic factors in patients with oral cavity and oropharyngeal squamous cell carcinoma
下载免费PDF全文
![点击此处可从《Head & neck》网站下载免费的PDF全文](/ch/ext_images/free.gif)
978.
Efficacy and safety of a cisplatin and paclitaxel induction regimen followed by chemoradiotherapy for patients with locally advanced head and neck squamous cell carcinoma
下载免费PDF全文
![点击此处可从《Head & neck》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Luciano de Souza Viana MD PhD Felipe Coelho de Aguiar Silva MD Alexandre Andrade dos Anjos Jacome MD PhD Danielle Calheiros Campelo Maia MD PhD Marcos Duarte de Mattos MD MSc Alexandre Arthur Jacinto MD Augusto Elias Mamere MD PhD Domingos Boldrini Junior MD MSc Renato de Castro Capuzzo MD Carlos Roberto Santos MD Andre Lopes Carvalho MD PhD 《Head & neck》2016,38(Z1):E970-E980
979.
Ruiz-Argüelles GJ González-Carrillo ML Estrada-Gómez R Valdés-Tapia P Parra-Ortega I Porras-Juárez A 《Gaceta médica de México》2007,143(4):317-322
OBJECTIVE: Over a 70-month period, 100 consecutive Mexican mestizo individuals with a clinical marker associated with a primary hypercoagulable state were studied. METHODS: We prospectively assessed: the sticky platelet syndrome (SPS), the activated protein C resistance (aPCR) phenotype, coagulation protein C activity and antigen, coagulation protein S, antithrombin III, plasminogen, IgG and IgM isotypes of antiphospholipid antibodies, homocysteine levels, the factor V gene Leiden, Cambridge, Hong Kong, and Liverpool mutations, the 677 C-->T mutation in the 5,10-methylenetetrahydrofolatereductase (MTHFR), and the G20210A polymorphism in the 3'-untranslated region of the prothrombin gene. RESULTS: Of the 100 consecutive patients prospectively accrued in the study, only 29% were males. In only 6 individuals could we not record any abnormality, whereas in most individuals (81%), two to five co-existing abnormalities were identified. In a multivariate analysis of the association of all these assesments, the only significant association was found between the factor V Leiden mutation and the aPCR phenotype (r = .495; p < 0.001). CONCLUSIONS: These results confirm previous observations on thrombophilia in Mexico underlining that it is a multifactorial disease. They also suggest that the abnormalities detected are not associated to each other. 相似文献
980.
Borghi AM Bonfiglioli C Lugli L Ricciardelli P Rubichi S Nicoletti R 《Neuroscience letters》2007,411(1):17-21
In two experiments we assessed whether seeing objects automatically activates information regarding how to manipulate them. In Experiment 1 participants categorized photographs of objects that could be manipulated either with a power or a precision grip into artefacts or natural kinds. Target-objects were preceded by primes consisting of photographs of hands in grasping postures (precision or power grip). Experiment 2 involved a preliminary motor training phase in which each visual prime was associated with the actual motor action. In both experiments, natural kinds graspable with a power grip produced the fastest responses. In Experiment 2 we also found a congruency effect between the prime and the kind of grip required by the object (precision, power). Results suggest that visual stimuli automatically activate motor information. Specific motor programs are, however, activated only if motor training is performed before the categorization task. Implications of the results for the understanding of the organization of conceptual and motor information in the brain are discussed. 相似文献