全文获取类型
收费全文 | 22609篇 |
免费 | 1148篇 |
国内免费 | 129篇 |
专业分类
耳鼻咽喉 | 276篇 |
儿科学 | 447篇 |
妇产科学 | 503篇 |
基础医学 | 2998篇 |
口腔科学 | 1731篇 |
临床医学 | 1665篇 |
内科学 | 5701篇 |
皮肤病学 | 573篇 |
神经病学 | 1957篇 |
特种医学 | 529篇 |
外科学 | 3053篇 |
综合类 | 85篇 |
一般理论 | 5篇 |
预防医学 | 1484篇 |
眼科学 | 413篇 |
药学 | 1130篇 |
中国医学 | 109篇 |
肿瘤学 | 1227篇 |
出版年
2024年 | 17篇 |
2023年 | 159篇 |
2022年 | 399篇 |
2021年 | 755篇 |
2020年 | 421篇 |
2019年 | 529篇 |
2018年 | 762篇 |
2017年 | 430篇 |
2016年 | 576篇 |
2015年 | 697篇 |
2014年 | 979篇 |
2013年 | 1128篇 |
2012年 | 1839篇 |
2011年 | 1990篇 |
2010年 | 1090篇 |
2009年 | 973篇 |
2008年 | 1635篇 |
2007年 | 1663篇 |
2006年 | 1519篇 |
2005年 | 1305篇 |
2004年 | 1198篇 |
2003年 | 1021篇 |
2002年 | 989篇 |
2001年 | 130篇 |
2000年 | 116篇 |
1999年 | 145篇 |
1998年 | 143篇 |
1997年 | 133篇 |
1996年 | 115篇 |
1995年 | 98篇 |
1994年 | 95篇 |
1993年 | 82篇 |
1992年 | 80篇 |
1991年 | 79篇 |
1990年 | 63篇 |
1989年 | 56篇 |
1988年 | 41篇 |
1987年 | 32篇 |
1986年 | 40篇 |
1985年 | 30篇 |
1984年 | 44篇 |
1983年 | 43篇 |
1982年 | 26篇 |
1981年 | 26篇 |
1980年 | 26篇 |
1979年 | 16篇 |
1978年 | 18篇 |
1977年 | 26篇 |
1974年 | 15篇 |
1973年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 886 毫秒
971.
972.
973.
Evaluation of the methylation profile of exfoliated cell samples from patients with 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)
974.
975.
Castillo-Bautista Cristina M. Torres-Tapia Luis W. Rangel-Méndez Jorge A. Peraza-Sánchez Sergio R. Cortés Daniel Velasco Iván Moo-Puc Rosa E. 《Journal of natural medicines》2019,73(3):672-678
Journal of Natural Medicines - Neurological disorders are a public health problem worldwide for which there is currently no direct treatment of the cause of the disorder. The goal of this study was... 相似文献
976.
977.
978.
Renata Rocha de Almeida Luciana Soares de Souza Alexandre Dias Mançano Arthur Soares Souza Jr. Klaus Loureiro Irion Luiz Felipe Nobre Gláucia Zanetti Bruno Hochhegger Jorge Luiz Pereira e Silva Edson Marchiori 《Lung》2014,192(2):225-233
Cocaine is the most commonly used illicit drug among patients presenting at hospital emergency departments and the most frequent cause of drug-related deaths reported by medical examiners. Various respiratory problems temporally associated with cocaine use have been reported. Acute and chronic uses also are responsible for lung complications, such as pulmonary edema, alveolar hemorrhage, pulmonary hypertension, organizing pneumonia, emphysema, barotrauma, infection, cancer, eosinophilic disease, and aspiration pneumonia. Although most imaging findings are nonspecific, they may raise suspicion of a cocaine-related etiology when considered together with patients’ profiles and medical histories. This literature review describes cocaine-induced diseases with pulmonary involvement, with an emphasis on high-resolution chest computed tomographic findings and patterns. 相似文献
979.
980.
Auricelio Batista Cezar-Junior Igor Vilela Faquini Jos Laercio Junior Silva Eduardo Vieira de Carvalho Junior Luiz Euripedes Almondes Santana Lemos Joo Batista Monte Freire Filho Hetevaldo Tavares de Lira Filho Erton Cesar de Albuquerque Pontes Nivaldo Sena Almeida Hildo Rocha Cirne Azevedo-Filho 《Medicine》2020,99(51)
Some evidences suggest the involvement of the central nervous system in patients infected with SARS-CoV-2. We aim to analyze possible associations between coronavirus disease 2019 (COVID-19) pandemic and spontaneous subarachnoid hemorrhage (SAH), in a comprehensive neurological center.We conducted a retrospective case series of 4 patients infected by COVID-19, who developed spontaneous SAH. Clinical data were extracted from electronic medical records.Between March 24, 2020, and May 22, 2020, 4 cases (3 females; 1 male) of SAH were identified in patients infected with SARS-CoV-2, in a comprehensive neurological center in Brazil. The median age was 55.25 years (range 36 -71). COVID-19-related pneumonia was severe in 3 out of 4 cases, and all patients required critical care support during hospitalization. The patients developed Fisher grade III and IV SAH. Digital subtraction angiography (DSA) was performed in 3 of the 4 patients. However, in only 1 case, an aneurysm was identified. Inflammatory blood tests were elevated in all cases, with an average D-dimer of 2336 μg/L and mean C-reactive protein (CRP) of 3835 mg/dl The outcome was poor in the majority of the patients, with 1 death (25%); 2 (50%) remained severely neurologically affected (mRS:4); and 1 (25%) had slight disability (mRS:2).This study shows a series of 4 rare cases of SHA associated with COVID-19. The possible mechanisms underlying the involvement of SARSCoV-2 and SHA is yet to be fully understood. Therefore, SHA should be included in severe neurological manifestations in patients infected by this virus. 相似文献