全文获取类型
收费全文 | 1306363篇 |
免费 | 90932篇 |
国内免费 | 3170篇 |
专业分类
耳鼻咽喉 | 17111篇 |
儿科学 | 43487篇 |
妇产科学 | 35431篇 |
基础医学 | 190236篇 |
口腔科学 | 36131篇 |
临床医学 | 112583篇 |
内科学 | 261328篇 |
皮肤病学 | 31104篇 |
神经病学 | 106207篇 |
特种医学 | 47215篇 |
外国民族医学 | 385篇 |
外科学 | 187063篇 |
综合类 | 25082篇 |
一般理论 | 460篇 |
预防医学 | 109492篇 |
眼科学 | 29726篇 |
药学 | 94763篇 |
3篇 | |
中国医学 | 3055篇 |
肿瘤学 | 69603篇 |
出版年
2021年 | 11689篇 |
2019年 | 12683篇 |
2018年 | 20139篇 |
2017年 | 14391篇 |
2016年 | 15590篇 |
2015年 | 17547篇 |
2014年 | 21987篇 |
2013年 | 33961篇 |
2012年 | 49345篇 |
2011年 | 51616篇 |
2010年 | 28897篇 |
2009年 | 25284篇 |
2008年 | 46442篇 |
2007年 | 49289篇 |
2006年 | 48671篇 |
2005年 | 46934篇 |
2004年 | 45067篇 |
2003年 | 42752篇 |
2002年 | 40975篇 |
2001年 | 54876篇 |
2000年 | 56461篇 |
1999年 | 47283篇 |
1998年 | 12470篇 |
1997年 | 11071篇 |
1996年 | 11066篇 |
1995年 | 10599篇 |
1994年 | 9829篇 |
1992年 | 36345篇 |
1991年 | 35125篇 |
1990年 | 34593篇 |
1989年 | 33045篇 |
1988年 | 30228篇 |
1987年 | 30138篇 |
1986年 | 28265篇 |
1985年 | 27190篇 |
1984年 | 20274篇 |
1983年 | 17122篇 |
1982年 | 10167篇 |
1979年 | 18771篇 |
1978年 | 13507篇 |
1977年 | 11549篇 |
1976年 | 10845篇 |
1975年 | 11514篇 |
1974年 | 14047篇 |
1973年 | 13624篇 |
1972年 | 12524篇 |
1971年 | 11724篇 |
1970年 | 10904篇 |
1969年 | 10372篇 |
1968年 | 9675篇 |
排序方式: 共有10000条查询结果,搜索用时 968 毫秒
111.
112.
113.
114.
Sweeka Alexander Gurjeet Dulku Sharbell Hashoul Donna B Taylor 《Journal of Medical Imaging and Radiation Oncology》2019,63(4):473-478
Contrast‐enhanced spectral mammography (CESM) has a number of uses including the work‐up of inconclusive findings on mammography, assessment of breast symptoms, cancer staging, evaluation of response to neoadjuvant chemotherapy and recently as an alternative to magnetic resonance imaging (MRI) in high‐risk screening. CESM can be swiftly incorporated into the workflow of busy breast clinics. We share our experiences with CESM at a large breast assessment centre in Western Australia. 相似文献
115.
Widely Metastatic Squamous Cell Carcinoma Originating from Malignant Transformation of Hypertrophic Lichen Planus in a 24‐Year‐Old Woman: Case Report and Review of the Literature
下载免费PDF全文
![点击此处可从《Pediatric dermatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Lana X. Tong B.A. Matthew J. Weinstock M.D. Reed Drews M.D. Caroline C. Kim M.D. 《Pediatric dermatology》2015,32(3):e98-e101
Hypertrophic lichen planus (HLP) is a T‐cell‐mediated process typically presenting with hypertrophic or verrucous plaques on the lower limbs. We report the case of a 24‐year‐old woman with a history of HLP since age 3 years presenting with rapid malignant transformation of one lesion into a large squamous cell carcinoma (SCC). Subsequent examination revealed progressive, widespread metastatic involvement, and the patient ultimately died from her disease. SCC associated with HLP is rare, with a review of the literature revealing fewer than 50 cases. This case highlights the need to be aware of suspicious changes in HLP and to educate patients as to when to be reevaluated. 相似文献
116.
117.
118.
Melatonin reduces oxidative stress and improves vascular function in pulmonary hypertensive newborn sheep
下载免费PDF全文
![点击此处可从《Journal of pineal research》网站下载免费的PDF全文](/ch/ext_images/free.gif)
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
119.
120.
Maria Gonzalez-Cao Cristina Carrera Juan Francisco Rodriguez Moreno Pedro Rodríguez-Jiménez Mónica Antoñanzas Basa Rosa Feltes Ochoa Teresa Puertolas Eva Muñoz-Couselo José Luis Manzano Ivan Marquez-Rodas Juan Martín-Liberal Ainara Soria Pilar Lopez Criado Almudena Garcia-Castaño Aram Boada Pablo Ayala de Miguel Susana Puig Guillermo Crespo Alfonso Berrocal 《Journal of the American Academy of Dermatology》2021,84(5):1412-1415