全文获取类型
收费全文 | 177569篇 |
免费 | 37479篇 |
国内免费 | 6664篇 |
专业分类
耳鼻咽喉 | 3208篇 |
儿科学 | 3453篇 |
妇产科学 | 3511篇 |
基础医学 | 13001篇 |
口腔科学 | 6525篇 |
临床医学 | 36564篇 |
内科学 | 36375篇 |
皮肤病学 | 4223篇 |
神经病学 | 16358篇 |
特种医学 | 6797篇 |
外国民族医学 | 54篇 |
外科学 | 26202篇 |
综合类 | 11320篇 |
现状与发展 | 62篇 |
一般理论 | 22篇 |
预防医学 | 18403篇 |
眼科学 | 5081篇 |
药学 | 9696篇 |
68篇 | |
中国医学 | 4361篇 |
肿瘤学 | 16428篇 |
出版年
2024年 | 747篇 |
2023年 | 6036篇 |
2022年 | 3837篇 |
2021年 | 6800篇 |
2020年 | 8263篇 |
2019年 | 4876篇 |
2018年 | 9849篇 |
2017年 | 9817篇 |
2016年 | 10489篇 |
2015年 | 11736篇 |
2014年 | 15078篇 |
2013年 | 16174篇 |
2012年 | 9916篇 |
2011年 | 10133篇 |
2010年 | 10858篇 |
2009年 | 12131篇 |
2008年 | 7740篇 |
2007年 | 6527篇 |
2006年 | 7774篇 |
2005年 | 6172篇 |
2004年 | 4210篇 |
2003年 | 3670篇 |
2002年 | 3124篇 |
2001年 | 3668篇 |
2000年 | 2973篇 |
1999年 | 3784篇 |
1998年 | 3361篇 |
1997年 | 3156篇 |
1996年 | 2907篇 |
1995年 | 2593篇 |
1994年 | 1862篇 |
1993年 | 1404篇 |
1992年 | 1375篇 |
1991年 | 1158篇 |
1990年 | 1008篇 |
1989年 | 966篇 |
1988年 | 904篇 |
1987年 | 713篇 |
1986年 | 640篇 |
1985年 | 544篇 |
1984年 | 405篇 |
1983年 | 406篇 |
1982年 | 282篇 |
1981年 | 265篇 |
1980年 | 161篇 |
1979年 | 154篇 |
1978年 | 165篇 |
1977年 | 142篇 |
1976年 | 107篇 |
1974年 | 115篇 |
排序方式: 共有10000条查询结果,搜索用时 826 毫秒
101.
Evaluation of training nurses to perform semi‐automated three‐dimensional left ventricular ejection fraction using a customised workstation‐based training protocol
下载免费PDF全文
![点击此处可从《Journal of clinical nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
102.
103.
Elizabeth A. Mosley PhD MPH Amy J. Schulz PhD MPH MSW Lisa H. Harris MD PhD Barbara A. Anderson PhD 《Women & health》2020,60(7):806-820
ABSTRACT Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood. 相似文献
104.
105.
106.
107.
108.
109.
Xue Yao Yan Zhang Jian Hao Hui-Quan Duan Chen-Xi Zhao Chao Sun Bo Li Bao-You Fan Xu Wang Wen-Xiang Li Xuan-Hao Fu Yong Hu Chang Liu Xiao-Hong Kong Shi-Qing Feng 《中国神经再生研究》2019,(3)
Ferroptosis is an iron-dependent novel cell death pathway. Deferoxamine, a ferroptosis inhibitor, has been reported to promote spinal cord injury repair. It has yet to be clarified whether ferroptosis inhibition represents the mechanism of action of Deferoxamine on spinal cord injury recovery. A rat model of Deferoxamine at thoracic 10 segment was established using a modified Allen's method. Ninety 8-week-old female Wistar rats were used. Rats in the Deferoxamine group were intraperitoneally injected with 100 mg/kg Deferoxamine 30 minutes before injury. Simultaneously, the Sham and Deferoxamine groups served as controls. Drug administration was conducted for 7 consecutive days. The results were as follows:(1) Electron microscopy revealed shrunken mitochondria in the spinal cord injury group.(2) The Basso, Beattie and Bresnahan locomotor rating score showed that recovery of the hindlimb was remarkably better in the Deferoxamine group than in the spinal cord injury group.(3) The iron concentration was lower in the Deferoxamine group than in the spinal cord injury group after injury.(4) Western blot assay revealed that, compared with the spinal cord injury group, GPX4, xCT, and glutathione expression was markedly increased in the Deferoxamine group.(5) Real-time polymerase chain reaction revealed that, compared with the Deferoxamine group, mRNA levels of ferroptosis-related genes Acyl-CoA synthetase family member 2(ACSF2) and iron-responsive element-binding protein 2(IREB2) were up-regulated in the Deferoxamine group.(6) Deferoxamine increased survival of neurons and inhibited gliosis. These findings confirm that Deferoxamine can repair spinal cord injury by inhibiting ferroptosis. Targeting ferroptosis is therefore a promising therapeutic approach for spinal cord injury. 相似文献
110.