全文获取类型
收费全文 | 542914篇 |
免费 | 28768篇 |
国内免费 | 586篇 |
专业分类
耳鼻咽喉 | 6984篇 |
儿科学 | 17337篇 |
妇产科学 | 12942篇 |
基础医学 | 94962篇 |
口腔科学 | 12740篇 |
临床医学 | 49220篇 |
内科学 | 96804篇 |
皮肤病学 | 12392篇 |
神经病学 | 35027篇 |
特种医学 | 21418篇 |
外国民族医学 | 54篇 |
外科学 | 79963篇 |
综合类 | 7829篇 |
现状与发展 | 3篇 |
一般理论 | 108篇 |
预防医学 | 39374篇 |
眼科学 | 12095篇 |
药学 | 42695篇 |
1篇 | |
中国医学 | 1277篇 |
肿瘤学 | 29043篇 |
出版年
2021年 | 4077篇 |
2019年 | 4047篇 |
2018年 | 6055篇 |
2017年 | 4354篇 |
2016年 | 5164篇 |
2015年 | 5632篇 |
2014年 | 7529篇 |
2013年 | 11052篇 |
2012年 | 16592篇 |
2011年 | 18724篇 |
2010年 | 10583篇 |
2009年 | 9110篇 |
2008年 | 16609篇 |
2007年 | 18597篇 |
2006年 | 18052篇 |
2005年 | 17238篇 |
2004年 | 16686篇 |
2003年 | 16069篇 |
2002年 | 15547篇 |
2001年 | 22887篇 |
2000年 | 23533篇 |
1999年 | 19312篇 |
1998年 | 5336篇 |
1997年 | 4441篇 |
1996年 | 4458篇 |
1995年 | 4196篇 |
1992年 | 14487篇 |
1991年 | 15889篇 |
1990年 | 16010篇 |
1989年 | 15675篇 |
1988年 | 14352篇 |
1987年 | 14230篇 |
1986年 | 13219篇 |
1985年 | 12732篇 |
1984年 | 9420篇 |
1983年 | 8027篇 |
1982年 | 4196篇 |
1979年 | 8964篇 |
1978年 | 6394篇 |
1977年 | 5146篇 |
1976年 | 5513篇 |
1975年 | 6638篇 |
1974年 | 7449篇 |
1973年 | 7185篇 |
1972年 | 6607篇 |
1971年 | 6339篇 |
1970年 | 5909篇 |
1969年 | 5480篇 |
1968年 | 5183篇 |
1967年 | 4646篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
C. Dessinioti C.C. Zouboulis V. Bettoli D. Rigopoulos 《Journal of the European Academy of Dermatology and Venereology》2020,34(10):2229-2240
Guidelines and consensus on the management of patients with acne aim to give evidence-based, expert-group recommendations. This review compares current guidelines and consensus articles to provide a compilation of recommendations on the treatment of acne with oral isotretinoin. Ten common, relevant, clinical questions are addressed, based on published recommendations, including the indications of isotretinoin, the proposed daily dose, the cumulative isotretinoin dose and the laboratory monitoring needed. Recommendations on special considerations are also addressed, including the timing of procedures and the question of an association of depression or inflammatory bowel disease with isotretinoin. A major limitation is the use of different classification systems for acne across guidelines. The recommended daily dose ranges from 0.3 to 0.5 mg/kg in the European guidelines to up to 1 mg/kg in the US guidelines. A specific duration of treatment of at least 6 months is only recommended in the European guidelines. All guidelines report the need of strict pregnancy prevention measures. The European, French and US guidelines recommend to monitor for symptoms of depression. Important clinical questions that are inconsistently addressed in guidelines include the age indication, the recommendation for a cumulative dose, the timing of procedures, the association of isotretinoin with IBD, the recommendation for preventing acne flares and for appropriate laboratory monitoring. These topics should be clearly included in the recommendations of guidelines as they are often raised in everyday clinical practice. 相似文献
33.
34.
Stelter K. Theodoraki M. N. Becker S. Tsekmistrenko V. Olzowy B. Ledderose G. 《European archives of oto-rhino-laryngology》2015,272(3):639-639
European Archives of Oto-Rhino-Laryngology - 相似文献
35.
36.
37.
38.
39.
Melatonin reduces oxidative stress and improves vascular function in pulmonary hypertensive newborn sheep 下载免费PDF全文
Flavio Torres Alejandro González‐Candia Camilo Montt Germán Ebensperger Magdalena Chubretovic María Serón‐Ferré Roberto V. Reyes Aníbal J. Llanos Emilio A. Herrera 《Journal of pineal research》2015,58(3):362-373
Pulmonary hypertension of the newborn (PHN) constitutes a critical condition with severe cardiovascular and neurological consequences. One of its main causes is hypoxia during gestation, and thus, it is a public health concern in populations living above 2500 m. Although some mechanisms are recognized, the pathophysiological facts that lead to PHN are not fully understood, which explains the lack of an effective treatment. Oxidative stress is one of the proposed mechanisms inducing pulmonary vascular dysfunction and PHN. Therefore, we assessed whether melatonin, a potent antioxidant, improves pulmonary vascular function. Twelve newborn sheep were gestated, born, and raised at 3600 meters. At 3 days old, lambs were catheterized and daily cardiovascular measurements were recorded. Lambs were divided into two groups, one received daily vehicle as control and another received daily melatonin (1 mg/kg/d), for 8 days. At 11 days old, lung tissue and small pulmonary arteries (SPA) were collected. Melatonin decreased pulmonary pressure and resistance for the first 3 days of treatment. Further, melatonin significantly improved the vasodilator function of SPA, enhancing the endothelial‐ and muscular‐dependent pathways. This was associated with an enhanced nitric oxide‐dependent and nitric oxide independent vasodilator components and with increased nitric oxide bioavailability in lung tissue. Further, melatonin reduced the pulmonary oxidative stress markers and increased enzymatic and nonenzymatic antioxidant capacity. Finally, these effects were associated with an increase of lumen diameter and a mild decrease in the wall of the pulmonary arteries. These outcomes support the use of melatonin as an adjuvant in the treatment for PHN. 相似文献