全文获取类型
收费全文 | 1548147篇 |
免费 | 123581篇 |
国内免费 | 3869篇 |
专业分类
耳鼻咽喉 | 20321篇 |
儿科学 | 50891篇 |
妇产科学 | 44040篇 |
基础医学 | 218650篇 |
口腔科学 | 44219篇 |
临床医学 | 136541篇 |
内科学 | 315808篇 |
皮肤病学 | 36643篇 |
神经病学 | 128775篇 |
特种医学 | 58512篇 |
外国民族医学 | 484篇 |
外科学 | 228369篇 |
综合类 | 33885篇 |
现状与发展 | 4篇 |
一般理论 | 540篇 |
预防医学 | 124022篇 |
眼科学 | 34095篇 |
药学 | 106871篇 |
1篇 | |
中国医学 | 3895篇 |
肿瘤学 | 89031篇 |
出版年
2021年 | 14500篇 |
2019年 | 14854篇 |
2018年 | 20878篇 |
2017年 | 15891篇 |
2016年 | 17279篇 |
2015年 | 19607篇 |
2014年 | 27396篇 |
2013年 | 39470篇 |
2012年 | 54773篇 |
2011年 | 57690篇 |
2010年 | 33169篇 |
2009年 | 31499篇 |
2008年 | 51895篇 |
2007年 | 54714篇 |
2006年 | 54583篇 |
2005年 | 53391篇 |
2004年 | 50824篇 |
2003年 | 48111篇 |
2002年 | 44924篇 |
2001年 | 76089篇 |
2000年 | 77610篇 |
1999年 | 64343篇 |
1998年 | 18165篇 |
1997年 | 16399篇 |
1996年 | 16532篇 |
1995年 | 15594篇 |
1994年 | 14188篇 |
1993年 | 13320篇 |
1992年 | 47580篇 |
1991年 | 45118篇 |
1990年 | 43025篇 |
1989年 | 41064篇 |
1988年 | 37607篇 |
1987年 | 36716篇 |
1986年 | 34151篇 |
1985年 | 32503篇 |
1984年 | 24714篇 |
1983年 | 20743篇 |
1982年 | 12606篇 |
1981年 | 11180篇 |
1979年 | 21363篇 |
1978年 | 15022篇 |
1977年 | 12447篇 |
1976年 | 11671篇 |
1975年 | 12026篇 |
1974年 | 14417篇 |
1973年 | 13941篇 |
1972年 | 12977篇 |
1971年 | 11774篇 |
1970年 | 11260篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Carlo De-Carolis Geraldine-A. Boyd Luca Mancinelli Stefano Pagano Stefano Eramo 《Medicina oral, patología oral y cirugía bucal》2015,20(2):e205-e210
With easy chemical synthesis from its precursor, methamphetamine (MA) is now widespread in many countries. The abuse of methamphetamine is associated with several negative effects on health, because MA is a neurotoxin and a dangerous central nervous system stimulant. It changes levels of neurotransmitters in the brain, releasing dopamine and inhibiting nor epinephrine uptake which increases sympathetic nervous system activity and can lead to cardiac arrhythmia, hypertension and tachypnea. The consequences of MA abuse are clearly manifested in oral diseases (like “meth mouth”) which is characterised by extensive caries, teeth grinding with ensuing dental wear and trismus. The present review was designed to fill the gap in knowledge about methamphetamine abuse in the European Union (EU) and to illustrate the main clinical effects of prolonged use. After describing the pharmacology and systemic effects of methamphetamine and concentrating on its effects on the mouth, the present review compares the epidemiology and incidence of abuse in the world, particularly the USA and the EU.
Key words:Methamphetamine, “Meth mouth”, drug abuse, oral health. 相似文献
42.
43.
44.
Autoimmune comorbid diseases associated with lichen planus: a nationwide case–control study
下载免费PDF全文
![点击此处可从《Journal of the European Academy of Dermatology and Venereology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
45.
Pradeep Balasubramanian M.D. C. R. Srinivas M.D. Pavai Arunachalam M.S. M.Ch. K. S. Thirumurthy M.S. M.Ch. P. R. Rajkumar M.S. M.Ch. H. Manuvidhya M.B.B.S. 《Pediatric dermatology》2015,32(3):e78-e81
We report on a child with several café au lait spots in association with a lumbar lipomeningomyelocele as an apparently new association. Cutaneous markers, the identification of which plays a crucial role in the early diagnosis and management of spinal malformations, can accompany occult spinal dysraphism. Herein we report a case of lumbar lipomeningomyelocele associated with an overlying café au lait spot that served as a marker of occult spinal dysraphism. The patient also had segmental café au lait spots on the face, making the association unique. 相似文献
46.
47.
Nancy C. Lee 《Public health reports (Washington, D.C. : 1974)》2015,130(2):121-Apr;130(2):121
48.
49.
Wojciech Szychta M.D. Ph.D. Gheorghe Cerin M.D. Ph.D. F.E.S.C. Bogdan Adrian Popa M.D. Armienti Felice M.D. Guido Lanzillo M.D. Ph.D. Marco Diena M.D. Grzegorz Opolski M.D. Ph.D. F.E.S.C. 《Echocardiography (Mount Kisco, N.Y.)》2015,32(6):1040-1043
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning. 相似文献
50.