全文获取类型
| 收费全文 | 532114篇 |
| 免费 | 28380篇 |
| 国内免费 | 496篇 |
专业分类
| 耳鼻咽喉 | 6713篇 |
| 儿科学 | 17013篇 |
| 妇产科学 | 12644篇 |
| 基础医学 | 92941篇 |
| 口腔科学 | 12379篇 |
| 临床医学 | 48643篇 |
| 内科学 | 96053篇 |
| 皮肤病学 | 11931篇 |
| 神经病学 | 34254篇 |
| 特种医学 | 19959篇 |
| 外国民族医学 | 53篇 |
| 外科学 | 78469篇 |
| 综合类 | 7676篇 |
| 现状与发展 | 2篇 |
| 一般理论 | 108篇 |
| 预防医学 | 38634篇 |
| 眼科学 | 12061篇 |
| 药学 | 41583篇 |
| 1篇 | |
| 中国医学 | 1130篇 |
| 肿瘤学 | 28743篇 |
出版年
| 2021年 | 3958篇 |
| 2018年 | 5819篇 |
| 2017年 | 4185篇 |
| 2016年 | 4931篇 |
| 2015年 | 5448篇 |
| 2014年 | 7216篇 |
| 2013年 | 10614篇 |
| 2012年 | 15783篇 |
| 2011年 | 17585篇 |
| 2010年 | 10052篇 |
| 2009年 | 8912篇 |
| 2008年 | 15850篇 |
| 2007年 | 17591篇 |
| 2006年 | 17081篇 |
| 2005年 | 16374篇 |
| 2004年 | 16010篇 |
| 2003年 | 15366篇 |
| 2002年 | 14858篇 |
| 2001年 | 22514篇 |
| 2000年 | 23044篇 |
| 1999年 | 18970篇 |
| 1998年 | 5256篇 |
| 1997年 | 4380篇 |
| 1996年 | 4410篇 |
| 1995年 | 4133篇 |
| 1992年 | 14440篇 |
| 1991年 | 15840篇 |
| 1990年 | 15979篇 |
| 1989年 | 15650篇 |
| 1988年 | 14325篇 |
| 1987年 | 14216篇 |
| 1986年 | 13189篇 |
| 1985年 | 12701篇 |
| 1984年 | 9417篇 |
| 1983年 | 8016篇 |
| 1982年 | 4193篇 |
| 1979年 | 8950篇 |
| 1978年 | 6396篇 |
| 1977年 | 5163篇 |
| 1976年 | 5513篇 |
| 1975年 | 6623篇 |
| 1974年 | 7432篇 |
| 1973年 | 7169篇 |
| 1972年 | 6605篇 |
| 1971年 | 6314篇 |
| 1970年 | 5895篇 |
| 1969年 | 5473篇 |
| 1968年 | 5172篇 |
| 1967年 | 4632篇 |
| 1966年 | 3968篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
61.
I. D. Petrova V. S. Petrov S. V. Seregin E. M. Malkova 《Molecular Genetics, Microbiology and Virology》2015,30(4):186-191
This paper presents an analysis of samples from 75 patients for the presence of rubella virus, viral RNA, and specific antibodies. For all samples, RNA detection was higher than virus isolation. It was found that it was not possible to isolate rubella virus in every sixth clinical sample containing the viral RNA. Primary structures of the site (from the 8072nd to 8291st nucleotide) of the rubella virus genome from 14 samples were determined. This paper shows that all the samples of rubella virus belong to the first genotype, subgroups 1h, and very likely to subgroups 1a and 1F. For the first time, the circulation of rubella virus of the genotype has been shown both prior to the start of mass vaccination in Western Siberia and after. 相似文献
62.
63.
64.
65.
66.
67.
68.
Roberto V.P. Ribeiro Mitesh V. Badiwala Danny Ramzy Laura C. Tumiati Vivek Rao 《The Journal of thoracic and cardiovascular surgery》2019,157(2):615-625.e1
Objective
Hypertonic saline (HTS) has potent immune and vascular effects. We assessed recipient pretreatment with HTS on allograft function in a porcine model of heart transplantation and hypothesized that HTS infusion would limit endothelial and left ventricular (LV) dysfunction following transplantation.Methods
Heart transplants were performed after 6 hours of cold ischemic storage. Recipient pigs were randomized to treatment with or without HTS (7.5% NaCl) before cardiopulmonary bypass (CPB). Using a myograft apparatus, coronary artery endothelial-dependent (Edep) and -independent (Eind) relaxation was assessed. LV performance was determined using pressure-volume loop analysis. Pulmonary interleukin (IL)-2, IL-6, and tumor necrosis factor (TNF)-α expression was measured.Results
Weaning from CPB and LV performance after transplantation were improved in HTS-treated animals. Successful weaning from CPB was greater in the HTS-treated hearts (8 of 8 vs 2 of 8; P < .05). Mean LV functional recovery was improved in the HTS-treated animals, as assessed by preload recruitable stroke work (65 ± 10% vs 27 ± 10%; P < .001) and end-systolic elastance (55 ± 7% vs 37 ± 4%; P < .001). Treatment with HTS resulted in improved Edep (mean maximum elastance [Emax], 56 ± 5% vs 37 ± 7%; P < .001) and Eind (mean Emax%, 77 ± 6% vs 52 ± 4%; P < .001) vasorelaxation compared with control. Pulmonary expression of IL-2, IL-6, and TNF-α increased following transplantation, whereas HTS therapy attenuated IL production (P < .001). Transplantation increased plasma TNF-α levels and LV TNF-α expression, whereas HTS prevented this up-regulation (P < .001).Conclusions
Recipient HTS pretreatment preserves allograft vasomotor and LV function, and HTS therapy limits CPB-induced injury. HTS may be a novel recipient intervention to prevent graft dysfunction. 相似文献69.
70.
I. Fouzas C. Papanikolaou G. Katsanos N. Antoniadis N. Salveridis K. Karakasi S. Vasileiadou A. Fouza E. Mouloudi G. Imvrios V. Papanikolaou 《Transplantation proceedings》2019,51(2):416-420