全文获取类型
收费全文 | 10005篇 |
免费 | 719篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 50篇 |
儿科学 | 390篇 |
妇产科学 | 229篇 |
基础医学 | 1370篇 |
口腔科学 | 367篇 |
临床医学 | 1047篇 |
内科学 | 2055篇 |
皮肤病学 | 138篇 |
神经病学 | 923篇 |
特种医学 | 190篇 |
外科学 | 1169篇 |
综合类 | 85篇 |
一般理论 | 5篇 |
预防医学 | 1044篇 |
眼科学 | 132篇 |
药学 | 691篇 |
中国医学 | 5篇 |
肿瘤学 | 853篇 |
出版年
2023年 | 89篇 |
2022年 | 115篇 |
2021年 | 266篇 |
2020年 | 213篇 |
2019年 | 251篇 |
2018年 | 259篇 |
2017年 | 241篇 |
2016年 | 236篇 |
2015年 | 269篇 |
2014年 | 361篇 |
2013年 | 526篇 |
2012年 | 705篇 |
2011年 | 753篇 |
2010年 | 358篇 |
2009年 | 351篇 |
2008年 | 575篇 |
2007年 | 581篇 |
2006年 | 570篇 |
2005年 | 547篇 |
2004年 | 473篇 |
2003年 | 407篇 |
2002年 | 397篇 |
2001年 | 176篇 |
2000年 | 155篇 |
1999年 | 160篇 |
1998年 | 88篇 |
1997年 | 74篇 |
1996年 | 81篇 |
1995年 | 53篇 |
1994年 | 62篇 |
1993年 | 29篇 |
1992年 | 126篇 |
1991年 | 73篇 |
1990年 | 82篇 |
1989年 | 74篇 |
1988年 | 70篇 |
1987年 | 101篇 |
1986年 | 69篇 |
1985年 | 74篇 |
1984年 | 51篇 |
1983年 | 53篇 |
1982年 | 39篇 |
1980年 | 34篇 |
1979年 | 53篇 |
1978年 | 33篇 |
1977年 | 38篇 |
1975年 | 36篇 |
1974年 | 46篇 |
1973年 | 35篇 |
1970年 | 32篇 |
排序方式: 共有10000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 We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL,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.
4.
5.
6.
Coffee, cholesterol, and colon cancer: is there a link 总被引:1,自引:0,他引:1
7.
8.
9.
Effects of a very-low-calorie diet and physical-training regimens on body composition and resting metabolic rate in obese females 总被引:1,自引:0,他引:1
J E Donnelly N P Pronk D J Jacobsen S J Pronk J M Jakicic 《The American journal of clinical nutrition》1991,54(1):56-61
Sixty-nine obese females received 90 d of a liquid diet providing 2184 kJ/d in clinical trials. Groups were diet only (C), diet plus endurance exercise (EE), diet plus weight training (WT), or diet plus endurance exercise and weight training (EEWT). Changes in body weight, percent fat, fat weight, and fat-free mass were not different between groups. Declines in resting metabolic rate (RMR) were approximately 7% to approximately 12% of baseline values with no differences among groups. A significant increase in work capacity (approximately 16%) was shown for EEWT. Strength index showed declines of approximately 6% for C and EE and gains of approximately 3% and approximately 10% for EEWT and WT, respectively. These clinical trials did not show advantages of any exercise regimen over diet alone for weight loss, body-composition changes, or declines in RMR. Improvements in work capacity were limited and strength improved in groups that participated in strength training. 相似文献
10.