全文获取类型
收费全文 | 1572769篇 |
免费 | 114018篇 |
国内免费 | 3333篇 |
专业分类
耳鼻咽喉 | 19397篇 |
儿科学 | 52715篇 |
妇产科学 | 43890篇 |
基础医学 | 215840篇 |
口腔科学 | 39144篇 |
临床医学 | 137275篇 |
内科学 | 312620篇 |
皮肤病学 | 33968篇 |
神经病学 | 131920篇 |
特种医学 | 62191篇 |
外国民族医学 | 464篇 |
外科学 | 237203篇 |
综合类 | 35008篇 |
现状与发展 | 3篇 |
一般理论 | 488篇 |
预防医学 | 126424篇 |
眼科学 | 34089篇 |
药学 | 107270篇 |
1篇 | |
中国医学 | 3970篇 |
肿瘤学 | 96240篇 |
出版年
2021年 | 10848篇 |
2019年 | 11671篇 |
2018年 | 36917篇 |
2017年 | 28680篇 |
2016年 | 32327篇 |
2015年 | 16831篇 |
2014年 | 23254篇 |
2013年 | 34009篇 |
2012年 | 51777篇 |
2011年 | 67416篇 |
2010年 | 45540篇 |
2009年 | 37756篇 |
2008年 | 62290篇 |
2007年 | 66878篇 |
2006年 | 47798篇 |
2005年 | 47781篇 |
2004年 | 46878篇 |
2003年 | 45709篇 |
2002年 | 42469篇 |
2001年 | 73229篇 |
2000年 | 74894篇 |
1999年 | 61686篇 |
1998年 | 17167篇 |
1997年 | 15611篇 |
1996年 | 15639篇 |
1995年 | 14874篇 |
1994年 | 13478篇 |
1993年 | 12633篇 |
1992年 | 45860篇 |
1991年 | 43552篇 |
1990年 | 41598篇 |
1989年 | 39615篇 |
1988年 | 36223篇 |
1987年 | 35387篇 |
1986年 | 32881篇 |
1985年 | 31307篇 |
1984年 | 23839篇 |
1983年 | 20044篇 |
1982年 | 12231篇 |
1981年 | 10782篇 |
1979年 | 20702篇 |
1978年 | 14583篇 |
1977年 | 12087篇 |
1976年 | 11371篇 |
1975年 | 11624篇 |
1974年 | 14003篇 |
1973年 | 13535篇 |
1972年 | 12633篇 |
1971年 | 11470篇 |
1970年 | 10928篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
M.-A. Fauroux A. Germa P. Tramini C. Nabet 《Revue d'épidémiologie et de santé publique》2019,67(4):223-231
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France. 相似文献
2.
3.
4.
5.
Metabolism describes the series of chemical reactions that are concerned with the provision of energy to biological systems. They may be divided into reactions involved in energy yield (catabolism: demand exceeds supply), and energy storage (anabolism: supply exceeds demand). Regulation of these pathways is critical for homeostasis, and derangements in metabolism are seen in a wide variety of pathological processes. Understanding metabolism is key to the treatment of many diseases, notably diabetes, as well as underpinning clinical nutritional support. 相似文献
6.
7.
Seyed Mehdi BagheriMofidi Majid Pouladian Seyed Behnamedin Jameie Ali Abbaspour Tehrani-Fard 《Australasian physical & engineering sciences in medicine / supported by the Australasian College of Physical Scientists in Medicine and the Australasian Association of Physical Sciences in Medicine》2016,39(3):717-726
Magnetic field generated by neuronal activity could alter magnetic resonance imaging (MRI) signals but detection of such signal is under debate. Previous researches proposed that magnitude signal change is below current detectable level, but phase signal change (PSC) may be measurable with current MRI systems. Optimal imaging parameters like echo time, voxel size and external field direction, could increase the probability of detection of this small signal change. We simulate a voxel of cortical column to determine effect of such parameters on PSC signal. We extended a laminar network model for somatosensory cortex to find neuronal current in each segment of pyramidal neurons (PN). 60,000 PNs of simulated network were positioned randomly in a voxel. Biot–savart law applied to calculate neuronal magnetic field and additional phase. The procedure repeated for eleven neuronal arrangements in the voxel. PSC signal variation with the echo time and voxel size was assessed. The simulated results show that PSC signal increases with echo time, especially 100/80 ms after stimulus for gradient echo/spin echo sequence. It can be up to 0.1 mrad for echo time = 175 ms and voxel size = 1.48 × 1.48 × 2.18 mm3. With echo time less than 25 ms after stimulus, it was just acquired effects of physiological noise on PSC signal. The absolute value of the signal increased with decrease of voxel size, but its components had complex variation. External field orthogonal to local surface of cortex maximizes the signal. Expected PSC signal for tactile detection in the somatosensory cortex increase with echo time and have no oscillation. 相似文献
8.
Nancy C. Lee 《Public health reports (Washington, D.C. : 1974)》2015,130(2):121-Apr;130(2):121
9.
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
10.