全文获取类型
收费全文 | 47727篇 |
免费 | 2739篇 |
国内免费 | 164篇 |
专业分类
耳鼻咽喉 | 873篇 |
儿科学 | 1683篇 |
妇产科学 | 817篇 |
基础医学 | 6200篇 |
口腔科学 | 1073篇 |
临床医学 | 3689篇 |
内科学 | 11761篇 |
皮肤病学 | 1596篇 |
神经病学 | 4290篇 |
特种医学 | 1321篇 |
外科学 | 5898篇 |
综合类 | 221篇 |
一般理论 | 19篇 |
预防医学 | 4000篇 |
眼科学 | 1161篇 |
药学 | 2849篇 |
中国医学 | 146篇 |
肿瘤学 | 3033篇 |
出版年
2024年 | 49篇 |
2023年 | 336篇 |
2022年 | 479篇 |
2021年 | 1242篇 |
2020年 | 699篇 |
2019年 | 1308篇 |
2018年 | 1711篇 |
2017年 | 1139篇 |
2016年 | 1142篇 |
2015年 | 1299篇 |
2014年 | 1465篇 |
2013年 | 2040篇 |
2012年 | 3471篇 |
2011年 | 3761篇 |
2010年 | 1999篇 |
2009年 | 1634篇 |
2008年 | 3031篇 |
2007年 | 3203篇 |
2006年 | 2972篇 |
2005年 | 2923篇 |
2004年 | 2674篇 |
2003年 | 2528篇 |
2002年 | 2331篇 |
2001年 | 1194篇 |
2000年 | 1426篇 |
1999年 | 1107篇 |
1998年 | 314篇 |
1997年 | 243篇 |
1996年 | 212篇 |
1995年 | 152篇 |
1994年 | 112篇 |
1993年 | 96篇 |
1992年 | 361篇 |
1991年 | 267篇 |
1990年 | 234篇 |
1989年 | 172篇 |
1988年 | 168篇 |
1987年 | 172篇 |
1986年 | 126篇 |
1985年 | 120篇 |
1984年 | 95篇 |
1983年 | 75篇 |
1982年 | 31篇 |
1981年 | 40篇 |
1980年 | 35篇 |
1979年 | 63篇 |
1976年 | 33篇 |
1974年 | 34篇 |
1973年 | 41篇 |
1972年 | 32篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Streibert Fridolin Bernhardt Claudia Simon Philipp Hilbert-Carius Peter Wrigge Hermann 《Der Anaesthesist》2023,72(1):57-62
Die Anaesthesiologie - Die Anlage einer Magensonde im OP oder auf einer Intensivstation (ITS) stellt eine alltäglich durchgeführte Prozedur dar. Obwohl die Sonde häufig durch... 相似文献
2.
3.
4.
Jose M. Morales Jose Angel Martinez-Flores Manuel Serrano Maria José Castro Francisco Javier Alfaro Florencio García Miguel Angel Martínez Amado Andrés Esther González Manuel Praga Estela Paz-Artal Antonio Serrano 《Journal of the American Society of Nephrology : JASN》2015,26(3):735-745
In the current immunosuppressive therapy era, vessel thrombosis is the most common cause of early graft loss after renal transplantation. The prevalence of IgA anti–β2-glycoprotein I antibodies (IgA-aB2GPI-ab) in patients on dialysis is elevated (>30%), and these antibodies correlate with mortality and cardiovascular morbidity. To evaluate the effect of IgA-aB2GPI-ab in patients with transplants, we followed all patients transplanted from 2000 to 2002 in the Hospital 12 de Octubre prospectively for 10 years. Presence of IgA-aB2GPI-ab in pretransplant serum was examined retrospectively. Of 269 patients, 89 patients were positive for IgA-aB2GPI-ab (33%; group 1), and the remaining patients were negative (67%; group 2). Graft loss at 6 months post-transplant was significantly higher in group 1 (10 of 89 versus 3 of 180 patients in group 2; P=0.002). The most frequent cause of graft loss was thrombosis of the vessels, which was observed only in group 1 (8 of 10 versus 0 of 3 patients in group 2; P=0.04). Multivariate analysis showed that the presence of IgA-aB2GPI-ab was an independent risk factor for early graft loss (P=0.04) and delayed graft function (P=0.04). There were no significant differences regarding patient survival between the two groups. Graft survival was similar in both groups after 6 months. In conclusion, patients with pretransplant IgA-aB2GPI-ab have a high risk of early graft loss caused by thrombosis and a high risk of delayed graft function. Therefore, pretransplant IgA-aB2GPI-ab may have a detrimental effect on early clinical outcomes after renal transplantation. 相似文献
5.
6.
Alessia Scarselli Silvia Di Cesare Claudia Capponi Simona Cascioli Maria L. Romiti Gigliola Di Matteo Alessandra Simonetti Paolo Palma Andrea Finocchi Barbarella Lucarelli Rita M. Pinto Ippolita Rana Giuseppe Palumbo Maurizio Caniglia Paolo Rossi Rita Carsetti Caterina Cancrini Alessandro Aiuti 《Journal of clinical immunology》2015,35(4):373-383
7.
Paola Gilsanz Maria M. Corrada Claudia H. Kawas Elizabeth Rose Mayeda M. Maria Glymour Charles P. Quesenberry Catherine Lee Rachel A. Whitmer 《Alzheimer's & dementia》2019,15(4):497-505
Introduction
Little is known about dementia incidence in diverse populations of oldest-old, the age group with highest dementia incidence.Methods
Incident dementia diagnoses from 1/1/2010 to 9/30/2015 were abstracted from medical records for 2350 members of an integrated health care system in California (n = 1702 whites, n = 375 blacks, n = 105 Latinos, n = 168 Asians) aged ≥90 in 2010. We estimated race/ethnicity-specific age-adjusted dementia incidence rates and implemented Cox proportional hazards models and Fine and Gray competing risk of death models adjusted for demographics and comorbidities in midlife and late-life.Results
Dementia incidence rates (n = 771 cases) were lowest among Asians (89.9/1000 person-years), followed by whites (96.9/1000 person-years), Latinos (105.8/1000 person-years), and blacks (121.5/1000 person-years). Cox regression and competing risk models estimated 28% and 36% higher dementia risk for blacks versus whites adjusting for demographics and comorbidities.Discussion
Patterns of racial/ethnic disparities in dementia seen in younger older adults continue after the age of 90 years, though smaller in magnitude. 相似文献8.
9.
10.
Hanna Lee Mary K. Tan Andrew T. Yan Paul Angaran Paul Dorian Claudia Bucci Jean C. Gregoire Alan D. Bell Martin S. Green Peter L. Gross Allan Skanes Charles R. Kerr L. Brent Mitchell Jafna L. Cox Vidal Essebag Brett Heilbron Krishnan Ramanathan Carl Fournier Shaun G. Goodman 《The Canadian journal of cardiology》2019,35(2):160-168