全文获取类型
收费全文 | 7799篇 |
免费 | 634篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 49篇 |
儿科学 | 315篇 |
妇产科学 | 198篇 |
基础医学 | 1166篇 |
口腔科学 | 173篇 |
临床医学 | 775篇 |
内科学 | 1617篇 |
皮肤病学 | 95篇 |
神经病学 | 720篇 |
特种医学 | 147篇 |
外科学 | 910篇 |
综合类 | 56篇 |
一般理论 | 2篇 |
预防医学 | 825篇 |
眼科学 | 122篇 |
药学 | 478篇 |
中国医学 | 5篇 |
肿瘤学 | 795篇 |
出版年
2023年 | 81篇 |
2022年 | 46篇 |
2021年 | 223篇 |
2020年 | 191篇 |
2019年 | 211篇 |
2018年 | 227篇 |
2017年 | 205篇 |
2016年 | 215篇 |
2015年 | 228篇 |
2014年 | 284篇 |
2013年 | 417篇 |
2012年 | 520篇 |
2011年 | 604篇 |
2010年 | 302篇 |
2009年 | 273篇 |
2008年 | 477篇 |
2007年 | 481篇 |
2006年 | 468篇 |
2005年 | 455篇 |
2004年 | 381篇 |
2003年 | 309篇 |
2002年 | 355篇 |
2001年 | 121篇 |
2000年 | 97篇 |
1999年 | 91篇 |
1998年 | 86篇 |
1997年 | 59篇 |
1996年 | 51篇 |
1995年 | 50篇 |
1994年 | 40篇 |
1993年 | 27篇 |
1992年 | 81篇 |
1991年 | 60篇 |
1990年 | 55篇 |
1989年 | 49篇 |
1988年 | 48篇 |
1987年 | 53篇 |
1986年 | 56篇 |
1985年 | 62篇 |
1984年 | 55篇 |
1983年 | 39篇 |
1982年 | 28篇 |
1979年 | 31篇 |
1978年 | 21篇 |
1977年 | 25篇 |
1975年 | 20篇 |
1974年 | 24篇 |
1973年 | 20篇 |
1972年 | 20篇 |
1968年 | 17篇 |
排序方式: 共有8448条查询结果,搜索用时 31 毫秒
1.
2.
Anne-Sophie Worm Fenger Markus Harboe Olsen Maria Louise Fabritius Christian Gunge Riberholt Kirsten Møller 《Acta anaesthesiologica Scandinavica》2023,67(2):240-247
Background
Hyperglycaemia is common in patients with acute brain injury admitted to an intensive care unit (ICU). Many studies have found associations between development of hyperglycaemia and increased mortality in hospitalised patients. However, the optimal target for blood glucose control is unknown. We want to conduct a systematic review with meta-analysis and trial sequential analysis to explore the beneficial and harmful effects of restrictive versus liberal glucose control on patient outcomes in adults with severe acute brain injury.Methods
We will systematically search medical databases including CENTRAL, Embase, MEDLINE and trial registries. We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL, PubMed, EMBASE, Science Citation Index Expanded and CINAHL. Two authors will independently review and select trials and extract data. We will include randomised trials comparing levels of glucose control in our analyses and observational studies will be included to address potential harms. The primary outcomes are defined as all-cause mortality, functional outcome and health-related quality of life. Secondary outcomes include serious adverse events including hypoglycaemia, length of ICU stay and duration of mechanical ventilation, and explorative outcomes including intracranial pressure and infection. Trial Sequential Analysis will be used to investigate the risk of type I error due to repetitive testing and to further explore imprecision. Quality of trials will be evaluated using the Cochrane Risk of Bias tool, and quality of evidence will be assessed using the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) approach.Discussion
The results of the systematic review will be disseminated through peer-reviewed publication. With the review, we hope to inform future randomised clinical trials and improve clinical practice. 相似文献3.
Peter Düking Christoph Zinner Jennifer L. Reed Hans-Christer Holmberg Billy Sperlich 《Scandinavian journal of medicine & science in sports》2020,30(12):2291-2304
Monitoring variations in the functioning of the autonomic nervous system may help personalize training of runners and provide more pronounced physiological adaptations and performance improvements. We systematically reviewed the scientific literature comparing physiological adaptations and/or improvements in performance following training based on responses of the autonomic nervous system (ie, changes in heart rate variability) and predefined training. PubMed, SPORTDiscus, and Web of Science were searched systematically in July 2019. Keywords related to endurance, running, autonomic nervous system, and training. Studies were included if they (a) involved interventions consisting predominantly of running training; (b) lasted at least 3 weeks; (c) reported pre- and post-intervention assessment of running performance and/or physiological parameters; (d) included an experimental group performing training adjusted continuously on the basis of alterations in HRV and a control group; and (e) involved healthy runners. Five studies involving six interventions and 166 participants fulfilled our inclusion criteria. Four HRV-based interventions reduced the amount of moderate- and/or high-intensity training significantly. In five interventions, improvements in performance parameters (3000 m, 5000 m, Loadmax, Tlim) were more pronounced following HRV-based training. Peak oxygen uptake () and submaximal running parameters (eg, LT1, LT2) improved following both HRV-based and predefined training, with no clear difference in the extent of improvement in . Submaximal running parameters tended to improve more following HRV-based training. Research findings to date have been limited and inconsistent. Both HRV-based and predefined training improve running performance and certain submaximal physiological adaptations, with effects of the former training tending to be greater. 相似文献
4.
5.
6.
7.
8.
9.
10.