全文获取类型
收费全文 | 1855392篇 |
免费 | 134592篇 |
国内免费 | 3318篇 |
专业分类
耳鼻咽喉 | 26040篇 |
儿科学 | 62020篇 |
妇产科学 | 52422篇 |
基础医学 | 274730篇 |
口腔科学 | 52313篇 |
临床医学 | 161135篇 |
内科学 | 360007篇 |
皮肤病学 | 40034篇 |
神经病学 | 140295篇 |
特种医学 | 71218篇 |
外国民族医学 | 433篇 |
外科学 | 283600篇 |
综合类 | 39750篇 |
现状与发展 | 3篇 |
一般理论 | 437篇 |
预防医学 | 136104篇 |
眼科学 | 43132篇 |
药学 | 141756篇 |
9篇 | |
中国医学 | 4743篇 |
肿瘤学 | 103121篇 |
出版年
2018年 | 18470篇 |
2016年 | 15863篇 |
2015年 | 18068篇 |
2014年 | 24944篇 |
2013年 | 37648篇 |
2012年 | 51044篇 |
2011年 | 54224篇 |
2010年 | 32066篇 |
2009年 | 30099篇 |
2008年 | 51681篇 |
2007年 | 55634篇 |
2006年 | 56697篇 |
2005年 | 54577篇 |
2004年 | 52870篇 |
2003年 | 51056篇 |
2002年 | 49942篇 |
2001年 | 86838篇 |
2000年 | 88865篇 |
1999年 | 74716篇 |
1998年 | 20799篇 |
1997年 | 18299篇 |
1996年 | 18706篇 |
1995年 | 17654篇 |
1994年 | 16695篇 |
1993年 | 15357篇 |
1992年 | 59455篇 |
1991年 | 58558篇 |
1990年 | 57544篇 |
1989年 | 56348篇 |
1988年 | 52237篇 |
1987年 | 50799篇 |
1986年 | 48482篇 |
1985年 | 46023篇 |
1984年 | 34262篇 |
1983年 | 29519篇 |
1982年 | 17155篇 |
1981年 | 15199篇 |
1979年 | 32009篇 |
1978年 | 22477篇 |
1977年 | 19390篇 |
1976年 | 18320篇 |
1975年 | 20180篇 |
1974年 | 23744篇 |
1973年 | 22810篇 |
1972年 | 21624篇 |
1971年 | 20211篇 |
1970年 | 19049篇 |
1969年 | 18061篇 |
1968年 | 16859篇 |
1967年 | 14873篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
A novel BRAF mutation in association with primary amelanotic melanoma with oral metastases
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)
102.
103.
104.
Qianlai Luo Jonathan N. Hofmann Ruth M. Pfeiffer Cari M. Kitahara Minkyo Song Meredith S. Shiels 《International journal of cancer. Journal international du cancer》2023,153(1):64-72
In the United States, renal cell carcinoma (RCC) incidence and the prevalence of obesity, an established risk factor for RCC, have been increasing for several decades. RCC is more common among older individuals. We sought to quantify the contribution of excess adiposity to the rising incidence of RCC among individuals 60 years or older. National Institutes of Health-American Association of Retired Persons Diet and Health Study data (n = 453 859 participants, enrolled in 1995-1996, age at enrollment 50-71 years) were used to estimate multivariable-adjusted hazard ratios (HRs) for RCC across body mass index categories and HRs associated with smoking. Population attributable fractions (PAFs) were calculated using estimated HRs and annual overweight/obesity prevalence from the National Health Interview Survey (1985-2008). PAF estimates were combined with RCC incidence from Surveillance, Epidemiology and End Results-13 to calculate annual percent changes in RCC incidence attributable (and unrelated) to overweight/obesity. We found that between 1995 and 2018, among individuals aged 60 years and older, PAF for overweight/obesity increased from 18% to 29% for all RCCs. In comparison, the PAF for smoking declined from 12% to 9%. RCC incidence increased 1.8% per year (95% confidence interval [CI] 1.5%-2.1%) overall, while RCC incidence attributable to overweight/obesity increased 3.8% per year (95%CI 3.5%-4.2%) and RCC incidence unrelated to overweight/obesity increased 1.2% per year (95% CI 0.9%-1.4%). In conclusion, overweight/obesity appears to have contributed importantly to the rising incidence of RCC in the United States since the mid-1990s. Public health interventions focused on reducing overweight and obesity could help substantially in curbing this trend. 相似文献
105.
Turnbull Chris D. Stockley James A. Madathil Shyam Huq Syed S. A. Cooper Brendan G. Ali Asad Wharton Simon Stradling John R. Heitmar Rebekka 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2022,260(7):2129-2139
Graefe's Archive for Clinical and Experimental Ophthalmology - Retinal microvascular endothelial dysfunction is thought to be of importance in the development of ocular vascular diseases.... 相似文献
106.
107.
M. Zamparas V.C. Kapsalis G.L. Kyriakopoulos K.G. Aravossis A.E. Kanteraki A. Vantarakis I.K. Kalavrouziotis 《Sustainable Chemistry and Pharmacy》2019
At this study a multi-criteria model was developed to examine the available procedures, techniques and methods of handling infectious waste in the large healthcare unit of University Regional General Hospital of Patras, Western Greece. Particularly, this study examined the: a) current legislation and Directives issued for medical waste management at Greece and among the other EU-members, b) contribution of healthcare wastes (HCW) generation rate on social and economic parameters in selected European countries, c) available procedures, techniques, and methods upon the disposal of infectious wastes at the healthcare studied, and, d) propositions for integrated management of such hazardous wastes. Specifically, the Analytic Hierarchy Process (AHP) methodology was applied under pair wise comparison matrices in two stages: 1) the scale factors and the indicators, and 2) the criteria and their sub–criteria. The assessment of these pair wise matrices included the indicators and the sub–criteria. Subsequently, two pair wise comparison matrices, upon a) the “Fulfillment of environmental objectives” indicator and b) the “Energy consumption” sub criterion, were denoted. The AHP methodology yielded good results; however there is still space of improving the environmental performance. The normalized relative weights obtained for the criteria and sub criteria motivated specific actions that have to be handled. Particularly, the results indicated a very good value in environmental management criteria due the values obtained for the commitment towards the environmental policy standards and the waste management procedures. However, further improvements on staff awareness (such as development programs to enhance sensitivity) and more green purchasing suppliers, should be further addressed. 相似文献
108.
109.
110.
Anastasiia Panfilova Sarah E. Shelton Cristina Caresio Ruud J.G. van Sloun Filippo Molinari Hessel Wijkstra Paul A. Dayton Massimo Mischi 《Ultrasound in medicine & biology》2019,45(2):539-548
Dynamic contrast-enhanced ultrasound (DCE-US) has been proposed as a powerful tool for cancer diagnosis by estimation of perfusion and dispersion parameters reflecting angiogenic vascular changes. This work was aimed at identifying which vascular features are reflected by the estimated perfusion and dispersion parameters through comparison with acoustic angiography (AA). AA is a high-resolution technique that allows quantification of vascular morphology. Three-dimensional AA and 2-D DCE-US bolus acquisitions were used to monitor the growth of fibrosarcoma tumors in nine rats. AA-derived vascular properties were analyzed along with DCE-US perfusion and dispersion to investigate the differences between tumor and control and their evolution in time. AA-derived microvascular density and DCE-US perfusion exhibited good agreement, confirmed by their spatial distributions. No vascular feature was correlated with dispersion. Yet, dispersion provided better cancer classification than perfusion. We therefore hypothesize that dispersion characterizes vessels that are smaller than those visible with AA. 相似文献