全文获取类型
收费全文 | 1087179篇 |
免费 | 73919篇 |
国内免费 | 1414篇 |
专业分类
耳鼻咽喉 | 15107篇 |
儿科学 | 34950篇 |
妇产科学 | 28889篇 |
基础医学 | 155190篇 |
口腔科学 | 30062篇 |
临床医学 | 96723篇 |
内科学 | 206143篇 |
皮肤病学 | 24529篇 |
神经病学 | 82818篇 |
特种医学 | 43441篇 |
外国民族医学 | 201篇 |
外科学 | 165038篇 |
综合类 | 21773篇 |
现状与发展 | 1篇 |
一般理论 | 271篇 |
预防医学 | 75705篇 |
眼科学 | 24730篇 |
药学 | 87200篇 |
7篇 | |
中国医学 | 2816篇 |
肿瘤学 | 66918篇 |
出版年
2019年 | 8053篇 |
2018年 | 11718篇 |
2017年 | 9289篇 |
2016年 | 10563篇 |
2015年 | 11655篇 |
2014年 | 15760篇 |
2013年 | 23014篇 |
2012年 | 31492篇 |
2011年 | 33312篇 |
2010年 | 19625篇 |
2009年 | 18492篇 |
2008年 | 30745篇 |
2007年 | 32856篇 |
2006年 | 33488篇 |
2005年 | 31782篇 |
2004年 | 30378篇 |
2003年 | 29159篇 |
2002年 | 28132篇 |
2001年 | 60154篇 |
2000年 | 61588篇 |
1999年 | 51078篇 |
1998年 | 12594篇 |
1997年 | 11110篇 |
1996年 | 11111篇 |
1995年 | 10393篇 |
1994年 | 9445篇 |
1993年 | 8933篇 |
1992年 | 37862篇 |
1991年 | 36335篇 |
1990年 | 35794篇 |
1989年 | 34334篇 |
1988年 | 30934篇 |
1987年 | 30042篇 |
1986年 | 28269篇 |
1985年 | 26511篇 |
1984年 | 19247篇 |
1983年 | 16171篇 |
1982年 | 8884篇 |
1979年 | 17069篇 |
1978年 | 11449篇 |
1977年 | 10278篇 |
1976年 | 8870篇 |
1975年 | 10106篇 |
1974年 | 11670篇 |
1973年 | 11289篇 |
1972年 | 10770篇 |
1971年 | 10103篇 |
1970年 | 9260篇 |
1969年 | 8951篇 |
1968年 | 7938篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
Birgitta Malmberg Göran Kecklund Björn Karlson Roger Persson Per Flisberg Palle Ørbaek 《BMC health services research》2010,10(1):239
Background
It is well known that physicians' night-call duty may cause impaired performance and adverse effects on subjective health, but there is limited knowledge about effects on sleep duration and recovery time. In recent years occupational stress and impaired well-being among anaesthesiologists have been frequently reported for in the scientific literature. Given their main focus on handling patients with life-threatening conditions, when on call, one might expect sleep and recovery to be negatively affected by work, especially in this specialist group. The aim of the present study was to examine whether a 16-hour night-call schedule allowed for sufficient recovery in anaesthesiologists compared with other physician specialists handling less life-threatening conditions, when on call. 相似文献995.
996.
997.
998.
999.
Further evidence of dopamine transporter dysregulation in ADHD: a controlled PET imaging study using altropane. 总被引:4,自引:0,他引:4
Thomas J Spencer Joseph Biederman Bertha K Madras Darin D Dougherty Ali A Bonab Elijahu Livni Peter C Meltzer Jessica Martin Scott Rauch Alan J Fischman 《Neuropsychopharmacology》2007,62(9):1059-1061
BACKGROUND: The dopamine transporter (DAT) is known to be a key regulator of dopamine, and recent studies of genetics, treatment, and imaging have highlighted the role of DAT in attention-deficit/hyperactivity disorder (ADHD). The findings of in vivo neuroimaging of DAT in ADHD have been somewhat discrepant, however. METHOD: Dopamine transporter binding was measured using a highly selective ligand (C-11 altropane) and positron emission tomography (PET). The sample consisted of 47 well-characterized, treatment-na?ve, nonsmoking, non-comorbid adults with and without ADHD. Additionally, control subjects had few symptoms of ADHD. RESULTS: Results showed significantly increased DAT binding in the right caudate in adults with ADHD compared with matched control subjects without this disorder. CONCLUSIONS: These results confirm abnormal DAT binding in the striatum of adults with ADHD and provide further support that dysregulation of DAT may be an important component of the pathophysiology of ADHD. 相似文献
1000.
F. Forterre S. Kaiser K. Matiasek L. Brunnberg 《Transboundary and Emerging Diseases》2007,54(5):250-253
This article describes identification of a metastatic adenocarcinoma to the intertransversarius cervicis muscle using magnetic resonance imaging (MRI) in a dog that presented with chronic lameness of the right forelimb. Magnetic resonance imaging revealed a right sided, ovoid signal abnormality within the intertransversarius cervicis muscle lateral to the sixth cervical (C6) vertebra. The lesion was uniform, hyperintense on T2‐ and isointense on T1‐weighted images to muscle and exhibited uniform contrast enhancement on T1‐weighted images. The MRI findings were consistent with a neoplasia. Surgical excision was performed. Histopathological diagnosis was metastatic fibrous adenocarcinoma. The dog recovered rapidly but 6 months post‐operatively he was killed because of lung metastases. Necropsy was declined and the primary tumour could not be identified. 相似文献