全文获取类型
收费全文 | 18212篇 |
免费 | 1242篇 |
国内免费 | 100篇 |
专业分类
耳鼻咽喉 | 149篇 |
儿科学 | 362篇 |
妇产科学 | 408篇 |
基础医学 | 2249篇 |
口腔科学 | 520篇 |
临床医学 | 1727篇 |
内科学 | 3715篇 |
皮肤病学 | 295篇 |
神经病学 | 1726篇 |
特种医学 | 656篇 |
外科学 | 2769篇 |
综合类 | 209篇 |
现状与发展 | 1篇 |
一般理论 | 28篇 |
预防医学 | 1564篇 |
眼科学 | 556篇 |
药学 | 1360篇 |
中国医学 | 39篇 |
肿瘤学 | 1221篇 |
出版年
2024年 | 19篇 |
2023年 | 167篇 |
2022年 | 343篇 |
2021年 | 722篇 |
2020年 | 356篇 |
2019年 | 529篇 |
2018年 | 623篇 |
2017年 | 464篇 |
2016年 | 454篇 |
2015年 | 574篇 |
2014年 | 800篇 |
2013年 | 916篇 |
2012年 | 1521篇 |
2011年 | 1498篇 |
2010年 | 822篇 |
2009年 | 755篇 |
2008年 | 1213篇 |
2007年 | 1208篇 |
2006年 | 1117篇 |
2005年 | 1105篇 |
2004年 | 981篇 |
2003年 | 862篇 |
2002年 | 799篇 |
2001年 | 138篇 |
2000年 | 83篇 |
1999年 | 118篇 |
1998年 | 143篇 |
1997年 | 127篇 |
1996年 | 101篇 |
1995年 | 85篇 |
1994年 | 66篇 |
1993年 | 58篇 |
1992年 | 66篇 |
1991年 | 49篇 |
1990年 | 48篇 |
1989年 | 50篇 |
1988年 | 38篇 |
1987年 | 36篇 |
1986年 | 26篇 |
1985年 | 23篇 |
1984年 | 44篇 |
1983年 | 35篇 |
1982年 | 31篇 |
1981年 | 38篇 |
1980年 | 33篇 |
1979年 | 14篇 |
1978年 | 18篇 |
1977年 | 14篇 |
1976年 | 20篇 |
1974年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Alex Pizzini Fabian Lunger Amra Sahanic Nada Nemati Dietmar Fuchs Günter Weiss 《COPD》2017,14(3):298-303
Acute exacerbations and community-acquired pneumonia (CAP) are severe complications in patients with chronic obstructive pulmonary disease (COPD). In this study, we analyzed inflammatory parameters in serum including C-reactive protein (CRP), procalcitonin (PCT), and serum neopterin (NPT) to determine their potential to differentiate between patients with CAP+COPD and with acute exacerbations of COPD (AECOPD) without pneumonia. 102 (39 women and 63 men) patients were included in this retrospective study, of whom 48 presented with CAP without underlying COPD, 20 with CAP+COPD and 34 with AECOPD. CRP, PCT, and blood counts were determined by routine automated tests, and NPT concentrations were determined by ELISA. The ratios of CRP to NPT levels were calculated. Upon patient admission, CRP, PCT, and NPT levels were significantly higher in patients with CAP compared to those in AECOPD patients. CRP/NPT ratio was lower in AECOPD compared to CAP (+/?COPD) patients. Positive correlations were found between duration of hospitalization and CRP levels and the CRP/NPT ratio at study entry. Patients who were readmitted within 30 days tended to have higher NPT levels at initial presentation. Patients under ongoing corticosteroid treatment presented with lower inflammatory parameters. The CRP/NPT-ratio was suited well to discriminate between AECOPD and CAP on the basis of COPD, a CRP/NPT cutoff of 0.346 provided a sensitivity of 65% and a specificity of 79%. The combinatory use of inflammatory patterns might help to differentiate patients with AECOPD from those with CAP on the basis of COPD. 相似文献
992.
993.
Benjamin Piura Alex Rabinovich Liat Apel-Sarid Ruthy Shaco-Levy 《Archives of gynecology and obstetrics》2009,280(6):1001-1006
Introduction
Splenic metastasis from endometrial carcinoma is a rare clinical event, with only 11 cases documented previously in the literature. 相似文献994.
995.
996.
997.
Paula C. Pinheiro Ana L. Daniel-da-Silva Daniela S. Tavares M. Pilar Calatayud Gerardo F. Goya Tito Trindade 《Materials》2013,6(8):3213-3225
Bimodal nanoprobes comprising both magnetic and optical functionalities have been prepared via a sequential two-step process. Firstly, magnetite nanoparticles (MNPs) with well-defined cubic shape and an average dimension of 80 nm were produced by hydrolysis of iron sulfate and were then surface modified with silica shells by using the sol-gel method. The Fe3O4@SiO2 particles were then functionalized with the fluorophore, fluorescein isothiocyanate (FITC), mediated by assembled shells of the cationic polyelectrolyte, polyethyleneimine (PEI). The Fe3O4 functionalized particles were then preliminary evaluated as fluorescent and magnetic probes by performing studies in which neuroblast cells have been contacted with these nanomaterials. 相似文献
998.
999.
Saptarshi Mukerji Lyle Moncur Brendon Sanders Alex Currie Alistair Watson Karen Leeman 《The Australasian medical journal》2013,6(7):367-370
Tuberculosis (TB) of the cervix is a rare disease, especially in developed countries. We presented a patient with primary TB of the cervix with no concurrent immune deficiency or HIV infections. The case clinically mimicked carcinoma of the cervix. Difficulties in diagnosis have been discussed. Given the recent increase in migration patterns including travel from TB endemic areas, an abnormal-looking cervix should be regarded with a degree of suspicion for TB. 相似文献
1000.