全文获取类型
收费全文 | 74753篇 |
免费 | 4126篇 |
国内免费 | 589篇 |
专业分类
耳鼻咽喉 | 870篇 |
儿科学 | 1363篇 |
妇产科学 | 1731篇 |
基础医学 | 9094篇 |
口腔科学 | 2974篇 |
临床医学 | 5945篇 |
内科学 | 20524篇 |
皮肤病学 | 1289篇 |
神经病学 | 6975篇 |
特种医学 | 2377篇 |
外科学 | 11589篇 |
综合类 | 250篇 |
一般理论 | 13篇 |
预防医学 | 3715篇 |
眼科学 | 1238篇 |
药学 | 4021篇 |
中国医学 | 176篇 |
肿瘤学 | 5324篇 |
出版年
2024年 | 65篇 |
2023年 | 631篇 |
2022年 | 1358篇 |
2021年 | 2555篇 |
2020年 | 1461篇 |
2019年 | 2038篇 |
2018年 | 2615篇 |
2017年 | 1868篇 |
2016年 | 2067篇 |
2015年 | 2318篇 |
2014年 | 3099篇 |
2013年 | 3989篇 |
2012年 | 6118篇 |
2011年 | 5966篇 |
2010年 | 3364篇 |
2009年 | 2996篇 |
2008年 | 5005篇 |
2007年 | 5163篇 |
2006年 | 4753篇 |
2005年 | 4540篇 |
2004年 | 4107篇 |
2003年 | 3701篇 |
2002年 | 3242篇 |
2001年 | 520篇 |
2000年 | 414篇 |
1999年 | 514篇 |
1998年 | 590篇 |
1997年 | 509篇 |
1996年 | 423篇 |
1995年 | 408篇 |
1994年 | 336篇 |
1993年 | 266篇 |
1992年 | 252篇 |
1991年 | 191篇 |
1990年 | 176篇 |
1989年 | 134篇 |
1988年 | 144篇 |
1987年 | 113篇 |
1986年 | 114篇 |
1985年 | 131篇 |
1984年 | 122篇 |
1983年 | 104篇 |
1982年 | 138篇 |
1981年 | 95篇 |
1980年 | 94篇 |
1979年 | 80篇 |
1978年 | 75篇 |
1977年 | 58篇 |
1976年 | 49篇 |
1973年 | 55篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Whereas there is evidence that interpersonal communication, or conversation, influences predictors of alcohol consumption, the role of involvement in conversation effects remains unclear. This study explored how three aspects of involvement (topical relevance, or how relevant the topic of alcohol is; conversational relevance, or how relevant a conversation about alcohol is; and conversational effort, or how much effort people put into such a conversation), influence conversation effects. After assessing topical relevance, 46 same-sex dyads were requested to talk about the negative consequences of heavy drinking. Within each dyad, one participant was asked to take on an active talking role and the other participant a passive listening role. Next, conversational relevance, effort, and predictors of heavy drinking were measured. Results showed that participants who drank more alcohol found the topic of heavy drinking more relevant. This topical relevance increased conversational relevance and conversational effort. Conversational effort further increased when a talking role was assigned. Furthermore, participants who put more effort in the conversation and found it more relevant had more positive norms, identified more strongly with alcohol, and had higher intentions to drink. These findings suggest that more involvement in an alcohol-related conversation does not always lead to desirable outcomes. 相似文献
2.
3.
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
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.
Primary cutaneous anaplastic large cell lymphomas with 6p25.3 rearrangement exhibit particular histological features
下载免费PDF全文
![点击此处可从《Histopathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
7.
Borrelli Enrico Grosso Domenico Vella Giovanna Sacconi Riccardo Battista Marco Querques Lea Zucchiatti Ilaria Prascina Francesco Bandello Francesco Querques Giuseppe 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2020,258(12):2621-2628
Graefe's Archive for Clinical and Experimental Ophthalmology - To estimate the impact of delayed care during the coronavirus disease 2019 (COVID-19) pandemic on the outcomes of patients with... 相似文献
8.
9.