全文获取类型
收费全文 | 194198篇 |
免费 | 2112篇 |
国内免费 | 67篇 |
专业分类
耳鼻咽喉 | 1337篇 |
儿科学 | 7206篇 |
妇产科学 | 3495篇 |
基础医学 | 19177篇 |
口腔科学 | 2904篇 |
临床医学 | 14531篇 |
内科学 | 34257篇 |
皮肤病学 | 1053篇 |
神经病学 | 17987篇 |
特种医学 | 9221篇 |
外科学 | 30614篇 |
综合类 | 2443篇 |
一般理论 | 11篇 |
预防医学 | 20563篇 |
眼科学 | 3011篇 |
药学 | 10666篇 |
1篇 | |
中国医学 | 724篇 |
肿瘤学 | 17176篇 |
出版年
2023年 | 140篇 |
2022年 | 317篇 |
2021年 | 588篇 |
2020年 | 421篇 |
2019年 | 544篇 |
2018年 | 22522篇 |
2017年 | 17755篇 |
2016年 | 19962篇 |
2015年 | 1480篇 |
2014年 | 1598篇 |
2013年 | 1819篇 |
2012年 | 8506篇 |
2011年 | 22693篇 |
2010年 | 19660篇 |
2009年 | 12255篇 |
2008年 | 20702篇 |
2007年 | 22934篇 |
2006年 | 1688篇 |
2005年 | 3198篇 |
2004年 | 4313篇 |
2003年 | 5098篇 |
2002年 | 3235篇 |
2001年 | 557篇 |
2000年 | 619篇 |
1999年 | 396篇 |
1998年 | 344篇 |
1997年 | 313篇 |
1996年 | 172篇 |
1995年 | 192篇 |
1994年 | 158篇 |
1993年 | 131篇 |
1992年 | 121篇 |
1991年 | 160篇 |
1990年 | 207篇 |
1989年 | 160篇 |
1988年 | 120篇 |
1987年 | 97篇 |
1986年 | 64篇 |
1985年 | 97篇 |
1984年 | 68篇 |
1983年 | 62篇 |
1982年 | 54篇 |
1980年 | 71篇 |
1979年 | 43篇 |
1978年 | 40篇 |
1974年 | 41篇 |
1969年 | 36篇 |
1938年 | 60篇 |
1932年 | 59篇 |
1930年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Flávia Giolo De Carvalho Flávia Troncon Rosa Vivian Marques Miguel Suen Ellen Cristini Freitas Gilberto José Padovan Julio Sérgio Marchini 《Nutrition (Burbank, Los Angeles County, Calif.)》2012,28(11-12):1127-1131
ObjectiveThe aim of this study was to assess the nutritional zinc (Zn) status of elite swimmers during different training periods.MethodsA longitudinal paired study was performed at the University of Sao Paulo in eight male swimmers 18 to 25 y old who had been swimming competitively at the state and national levels for at least 5 y. The swimmers were evaluated over a total period of 14 wk: before the basic and specific preparatory period (BSPP-baseline), at the end of the basic and specific preparatory period (post-BSPP), and at the end of the polishing period (PP). Levels of Zn were determined in the plasma, erythrocyte, urine, and saliva by atomic absorption spectrophotometry. Anthropometric measurements and a 3-d food record were also evaluated.ResultsThe median plasma Zn concentration was below the reference value in all training periods (BSPP-baseline 59 μg/dL, post-BSPP 55.9 μg/dL, after PP 58.8 μg/dL, P > 0.05), as were threshold values for erythrocytes (BSPP-baseline 36.5 μg of Zn/g of hemoglobin, post-BSPP 42 μg of Zn/g of hemoglobin, after PP 40.7 μg of Zn/g of hemoglobin, P > 0.05), urinary Zn (BSPP-baseline 280 μg/24 h, post-BSPP 337 μg/24 h, after PP 284 μg/24 h, P > 0.05), and salivary Zn (BSPP-baseline 66.1 μg/L, post-BSPP 54.1 μg/L, after PP 79.7 μg/L, P > 0.05). Salivary Zn did not correlate with plasma and erythrocyte Zn levels.ConclusionThe results suggest that the elite swimmers studied presented a possible Zn deficiency and that salivary Zn was not adequate to evaluate the Zn nutritional status. 相似文献
993.
An assessment of the construct validity of the CHU9D in the Australian adolescent general population
Julie Ratcliffe Katherine Stevens Terry Flynn John Brazier Michael Sawyer 《Quality of life research》2012,21(4):717-725
Purpose
To assess the construct validity of the CHU9D in an adolescent general population sample. The CHU9D is a new generic preference-based measure of health-related quality of life developed specifically for application in the economic evaluation of health care treatments and interventions for young people. 相似文献994.
995.
Ljiljana Vlaški Dragan Dankuc Nada Vučković Vladimir Kljajić Danijela Dragičević Slobodanka Lemajić-Komazec 《Central European Journal of Medicine》2012,7(3):344-348
Aim
The aim of this paper is to present two case reports of patients with hemangiomas of the external auditory canal, and to overview all cases published in English language literature so far. 相似文献996.
Maria Alenita Oliveira Ana Luisa Godoy Fernandes Lucia Ande Santos Maria Amélia dos Santos Carvalho Sonia Maria Faresin Ilka Lopes Santoro 《The Journal of asthma》2013,50(5):407-410
Aim. To study any discriminative properties of SF-36 and QQL-EPM in stable and non-controlled moderate asthmatic patients. Methods. A total of 63 asthmatic patients were assessed regarding asthma symptoms, FEV1 % predicted value, PEF, ED visits and hospitalizations, QQL-EPM and SF-36 questionnaires. Results. QQL-EPM highlighted significance in all domains to distinguish stable from non-controlled patients (p = 0.0001) while SF-36 was only significant in 3 of its 7 domains (p = 0.009). Conclusion. The study showed that the specific quality of life questionnaire for asthma (QQL-EPM) demonstrates better discriminative properties that characterize asthma control when compared with the more generic SF-36 questionnaire. 相似文献
997.
998.
With increasing rates of obesity and new diagnostic criteria for gestational diabetes mellitus (GDM), the overall prevalence of GDM is increasing worldwide. Women with GDM have an increased risk of maternal and fetal complications during pregnancy as well as long-term risks including higher prevalence of type 2 diabetes mellitus and cardiovascular disease. In recent years, the role of immune activation and inflammation in the pathogenesis of GDM has gained increasing attention. This monograph explores the current state of the literature as regards the expression of markers of inflammation in the maternal circulation, placenta, and adipose tissue of women with GDM. 相似文献
999.
1000.