全文获取类型
收费全文 | 44510篇 |
免费 | 2670篇 |
国内免费 | 111篇 |
专业分类
耳鼻咽喉 | 673篇 |
儿科学 | 2033篇 |
妇产科学 | 1023篇 |
基础医学 | 5439篇 |
口腔科学 | 1923篇 |
临床医学 | 4063篇 |
内科学 | 9155篇 |
皮肤病学 | 1118篇 |
神经病学 | 3749篇 |
特种医学 | 1392篇 |
外国民族医学 | 2篇 |
外科学 | 6991篇 |
综合类 | 155篇 |
一般理论 | 17篇 |
预防医学 | 2788篇 |
眼科学 | 1294篇 |
药学 | 2911篇 |
中国医学 | 184篇 |
肿瘤学 | 2381篇 |
出版年
2023年 | 344篇 |
2022年 | 218篇 |
2021年 | 815篇 |
2020年 | 548篇 |
2019年 | 865篇 |
2018年 | 1358篇 |
2017年 | 964篇 |
2016年 | 1077篇 |
2015年 | 1042篇 |
2014年 | 1314篇 |
2013年 | 2027篇 |
2012年 | 3116篇 |
2011年 | 3578篇 |
2010年 | 1815篇 |
2009年 | 1293篇 |
2008年 | 3037篇 |
2007年 | 3244篇 |
2006年 | 3151篇 |
2005年 | 3191篇 |
2004年 | 3037篇 |
2003年 | 2811篇 |
2002年 | 2688篇 |
2001年 | 899篇 |
2000年 | 989篇 |
1999年 | 641篇 |
1998年 | 379篇 |
1997年 | 310篇 |
1996年 | 249篇 |
1995年 | 217篇 |
1994年 | 189篇 |
1993年 | 172篇 |
1992年 | 147篇 |
1991年 | 120篇 |
1990年 | 117篇 |
1989年 | 111篇 |
1988年 | 96篇 |
1987年 | 81篇 |
1986年 | 94篇 |
1985年 | 61篇 |
1984年 | 71篇 |
1983年 | 69篇 |
1982年 | 62篇 |
1981年 | 51篇 |
1980年 | 57篇 |
1979年 | 69篇 |
1978年 | 49篇 |
1977年 | 51篇 |
1974年 | 41篇 |
1973年 | 43篇 |
1972年 | 36篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Fevzi Altuntas Naim Ata Tugce Nur Yigenoglu Semih Bascı Mehmet Sinan Dal Serdal Korkmaz Sinem Namdaroglu Abdulkadir Basturk Tuba Hacıbekiroglu Mehmet Hilmi Dogu İlhami Berber Kursat Dal Kerem Kınık İbrahim Haznedaroglu Fatma Meriç Yılmaz İsa Kılıç Sinan Demircioğlu Alper Yosunkaya Osman Celik 《Transfusion and apheresis science》2021,60(1):102955
IntroductionPassive antibody therapy has been used to immunize vulnerable people against infectious agents. In this study, we aim to investigate the efficacy of convalescent plasma (CP) in the treatment of severe and critically ill patients diagnosed with COVID-19.MethodThe data of severe or critically ill COVID-19 patients who received anti-SARS-CoV-2 antibody-containing CP along with the antiviral treatment (n = 888) and an age-gender, comorbidity, and other COVID-19 treatments matched severe or critically ill COVID-19 patients at 1:1 ratio (n = 888) were analyzed retrospectively.ResultsDuration in the intensive care unit (ICU), the rate of mechanical ventilation (MV) support and vasopressor support were lower in CP group compared with the control group (p = 0.001, p = 0.02, p = 0.001, respectively). The case fatality rate (CFR) was 24.7 % in the CP group, and it was 27.7 % in the control group. Administration of CP 20 days after the COVID-19 diagnosis or COVID-19 related symptoms were associated with a higher rate of MV support compared with the first 3 interval groups (≤5 days, 6?10 days, 11?15 days) (p=0.001).ConclusionCP therapy seems to be effective for a better course of COVID-19 in severe and critically ill patients. 相似文献
992.
Puga Luís Teixeira Rogério Paiva Luís Ribeiro Joana Maria Gameiro João Sousa José Pedro Costa Marco Gonçalves Lino 《The international journal of cardiovascular imaging》2021,37(8):2359-2368
The International Journal of Cardiovascular Imaging - There is conflicting evidence regarding the significance of iatrogenic atrial septal defects (iASDs) after transseptal puncture during... 相似文献
993.
Arielle Blanjean Isabelle Kellens Benoit Misset Jean Joris Jean-Louis Croisier Anne-Françoise Rousseau 《Australian critical care》2021,34(4):311-318
BackgroundMuscle weakness is common in patients who survive a stay in the intensive care unit (ICU). Quadriceps strength (QS) measurement allows evaluation of lower limb performances that are associated with mobility outcomes.ObjectivesThe objective of the study was to characterise the range of QS in ICU survivors (ICUS) during their short-term evolution, by comparing them with surgical patients without critical illness and with healthy participants. The secondary aim was to explore whether physical activity before ICU admission influenced QS during that trajectory.MethodsPatients with length of ICU stay ≥2 days, adults scheduled for elective colorectal surgery, and young healthy volunteers were included. Maximal isometric QS was assessed using a handheld dynamometer and a previously validated standardised protocol. The dominant leg was tested in the supine position. ICUSs were tested in the ICU and 1 month after ICU discharge, while surgical patients were tested before and on the day after surgery, as well as 1 month after discharge. Healthy patients were tested once only. Patients were classified as physically inactive or active before admission from the self-report.ResultsThirty-eight, 32, and 34 participants were included in the ICU, surgical, and healthy groups, respectively. Demographic data were similar in the ICUS and surgical groups. In the ICU, QS was lower in the ICU group than in the surgical and healthy groups (3.01 [1.88–3.48], 3.38 [2.84–4.37], and 5.5 [4.75–6.05] N/kg, respectively). QS did not significantly improve 1 month after ICU discharge, excepted in survivors who were previously physically active (22/38, 56%): the difference between the two time points was ?6.6 [?27.1 to ?1.7]% vs 20.4 [?3.4 to 43.3]%, respectively, in physically inactive and active patients (p = 0.002).ConclusionsPatients who survived an ICU stay were weaker than surgical patients. However, a huge QS heterogeneity was observed among them. Their QS did not improve during the month after ICU discharge. Physically inactive patients should be early identified as at risk of poorer recovery. 相似文献
994.
995.
996.
997.
Free‐breathing combined three‐dimensional phase sensitive late gadolinium enhancement and T1 mapping for myocardial tissue characterization 下载免费PDF全文
998.
999.
François Letarte Julie Hallet Sébastien Drolet Cindy Boulanger-Gobeil Alexandre Bouchard Roger C. Grégoire Jean-Pierre Gagné Claude Thibault Philippe Bouchard 《American journal of surgery》2015,209(6):992-998