全文获取类型
收费全文 | 702731篇 |
免费 | 42334篇 |
国内免费 | 2805篇 |
专业分类
耳鼻咽喉 | 9473篇 |
儿科学 | 21533篇 |
妇产科学 | 17971篇 |
基础医学 | 111370篇 |
口腔科学 | 20324篇 |
临床医学 | 57476篇 |
内科学 | 133884篇 |
皮肤病学 | 17142篇 |
神经病学 | 50578篇 |
特种医学 | 23241篇 |
外国民族医学 | 80篇 |
外科学 | 98071篇 |
综合类 | 13524篇 |
现状与发展 | 4篇 |
一般理论 | 149篇 |
预防医学 | 59420篇 |
眼科学 | 16943篇 |
药学 | 56036篇 |
23篇 | |
中国医学 | 3321篇 |
肿瘤学 | 37307篇 |
出版年
2021年 | 7175篇 |
2019年 | 7452篇 |
2018年 | 10965篇 |
2017年 | 7659篇 |
2016年 | 8070篇 |
2015年 | 9353篇 |
2014年 | 11733篇 |
2013年 | 17082篇 |
2012年 | 25250篇 |
2011年 | 27258篇 |
2010年 | 15224篇 |
2009年 | 12891篇 |
2008年 | 23880篇 |
2007年 | 25485篇 |
2006年 | 25358篇 |
2005年 | 24333篇 |
2004年 | 22870篇 |
2003年 | 21665篇 |
2002年 | 21065篇 |
2001年 | 29119篇 |
2000年 | 30524篇 |
1999年 | 24767篇 |
1998年 | 6577篇 |
1997年 | 5575篇 |
1996年 | 5798篇 |
1995年 | 5318篇 |
1992年 | 17918篇 |
1991年 | 18265篇 |
1990年 | 18329篇 |
1989年 | 17394篇 |
1988年 | 16114篇 |
1987年 | 15855篇 |
1986年 | 14992篇 |
1985年 | 14274篇 |
1984年 | 10582篇 |
1983年 | 9062篇 |
1979年 | 10451篇 |
1978年 | 7565篇 |
1977年 | 6458篇 |
1976年 | 6259篇 |
1975年 | 7175篇 |
1974年 | 8602篇 |
1973年 | 8142篇 |
1972年 | 7959篇 |
1971年 | 7639篇 |
1970年 | 7063篇 |
1969年 | 6839篇 |
1968年 | 6518篇 |
1967年 | 5866篇 |
1966年 | 5236篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
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
13.
14.
Ruiz-Úcar Elena Acín-Gándara Débora Medina-García Manuel Ronda Diego Cruzado Pereira-Pérez Fernando 《Obesity surgery》2022,32(2):569-570
Obesity Surgery - Laparoscopic sleeve gastrectomy (LSG) is increasingly playing a key role in obesity management. Such operations, however, carry complications sometimes including leaks. The... 相似文献
15.
Yinlei
Wen Huaguang Zhang Hanguang Su He Ren 《Optimal control applications & methods.》2020,41(4):1233-1250
In this article, a model-free off-policy reinforcement learning algorithm is applied to address the optimal tracking problem based on multiplayer non-zero-sum games for discrete-time linear systems. In contrast to the traditional method and the policy iteration method for solving the optimal tracking problems, the proposed algorithm operates with the system data rather than the knowledge of the system dynamics. For performing the proposed algorithm, an auxiliary augmented system is constructed via assembling the original system and the reference trajectory while a discount factor is introduced into the performance indexes. It is analyzed that the solutions of the proposed algorithm converge to the Nash equilibrium and the result is not influenced by the probing noise. Two simulations are presented to verify the feasibility and effectiveness of the proposed algorithm. 相似文献
16.
17.
18.
Amosova E. N. Shilova I. V. Zueva E. P. Rybalkina O. Yu. 《Pharmaceutical Chemistry Journal》2020,54(7):721-724
Pharmaceutical Chemistry Journal - Three extracts were produced from the above-ground part of the meadowsweet Filipendula ulmaria (L.) Maxim. using water, 40% ethanol, and 70% ethanol. Comparative... 相似文献
19.
20.
Nevo N. Goldstein A. L. Staierman M. Eran N. Carmeli I. Rayman S. mnouskin Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally... 相似文献