首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   540篇
  免费   21篇
  国内免费   12篇
儿科学   4篇
妇产科学   47篇
基础医学   56篇
口腔科学   20篇
临床医学   31篇
内科学   147篇
皮肤病学   9篇
神经病学   62篇
特种医学   48篇
外科学   81篇
预防医学   17篇
眼科学   16篇
药学   11篇
中国医学   5篇
肿瘤学   19篇
  2023年   8篇
  2022年   12篇
  2021年   23篇
  2020年   9篇
  2019年   9篇
  2018年   16篇
  2017年   11篇
  2016年   16篇
  2015年   20篇
  2014年   28篇
  2013年   31篇
  2012年   42篇
  2011年   42篇
  2010年   22篇
  2009年   12篇
  2008年   39篇
  2007年   47篇
  2006年   31篇
  2005年   36篇
  2004年   26篇
  2003年   18篇
  2002年   12篇
  2001年   1篇
  1999年   2篇
  1998年   2篇
  1997年   6篇
  1996年   3篇
  1995年   3篇
  1994年   5篇
  1993年   2篇
  1992年   3篇
  1991年   3篇
  1990年   6篇
  1989年   3篇
  1988年   3篇
  1987年   3篇
  1986年   2篇
  1984年   2篇
  1983年   1篇
  1982年   3篇
  1981年   1篇
  1979年   1篇
  1978年   1篇
  1976年   1篇
  1975年   1篇
  1969年   1篇
  1966年   1篇
  1954年   1篇
  1933年   2篇
排序方式: 共有573条查询结果,搜索用时 15 毫秒
1.
2.
3.
The accuracy of two-dimensional echocardiography in the detection of intracardiac masses was verified in 334 patients who underwent cardiac catheterization in our laboratory over 21 consecutive months. A complete two-dimensional echocardiographic (2DE) examination was performed a day before catheterization. The presence or absence of a mass was verified at surgery in 77 patients who successively underwent mitral or aortic valve replacement (51), left ventricular aneurysmectomy with or without myocardial revascularization (25), and resection of atrial myxoma (2). In 32 patients 2DE revealed the presence of a mass-left or right atrial thrombi in 12, left atrial myxoma in 2, left ventricular thrombi in 16, and endocardial vegetations in 2. The other 45 patients were free of intracardiac masses on 2DE. Anatomic verification at surgery revealed the presence of an intracardiac mass in 34 patients. In 30 (true positives) of these, 2DE revealed the mass as well, and in 4 (false negatives) the presence of a mass had not been identified by 2DE. In 2 patients (false positives) the predicted mass was not found at surgery. Absence of a mass was correctly predicted by 2DE in 41 patients (true negatives). Thus 2DE detected intracardiac masses with sensitivity of 88.2% and a specificity of 95.3%. We recommend that 2DE be performed in all patients prior to hemodynamic study and/or cardiac surgery to enable safer management of patients with intracardiac masses during cardiac catheterization and/or cardiac surgery.  相似文献   
4.
The present study was undertaken with the aim to evaluate the prevalence of thermotolerant Campylobacter spp. in living pheasants in Italy. To achieve this goal, a total of 240 living pheasants, equally shared between female and male birds, were examined. Thermotolerant Campylobacter spp. was isolated in 104 out of 204 (43.3%) living pheasants analysed. Campylobacter coli (100%) and Campylobacter jejuni (13.5%) were identified by polymerase chain reaction. Adult pheasants showed a significantly higher prevalence value (P < 0.05) than younger pheasants.  相似文献   
5.
Metabolic- (dysfunction) associated fatty liver disease (MAFLD) represents the predominant hepatopathy and one of the most important systemic, metabolic-related disorders all over the world associated with severe medical and socio-economic repercussions due to its growing prevalence, clinical course (steatohepatitis and/or hepatocellular-carcinoma), and related extra-hepatic comorbidities. To date, no specific medications for the treatment of this condition exist, and the most valid recommendation for patients remains lifestyle change. MAFLD has been associated with metabolic syndrome; its development and progression are widely influenced by the interplay between genetic, environmental, and nutritional factors. Nutrigenetics and nutrigenomics findings suggest nutrition’s capability, by acting on the individual genetic background and modifying the specific epigenetic expression as well, to influence patients’ clinical outcome. Besides, immunity response is emerging as pivotal in this multifactorial scenario, suggesting the interaction between diet, genetics, and immunity as another tangled network that needs to be explored. The present review describes the genetic background contribution to MAFLD onset and worsening, its possibility to be influenced by nutritional habits, and the interplay between nutrients and immunity as one of the most promising research fields of the future in this context.  相似文献   
6.
7.
Dear Editor,We present an unusual case of acute graft rejection after photorefractive keratectomy(PRK),performed to correct high residual astigmatism after penetrating keratoplasty(PKP)for keratoconus.The primary measures of success for PKP are visual acuity,refractive outcomes。  相似文献   
8.
9.
10.
BACKGROUND: Several skin disorders are present in patients affected by coeliac disease (CD) - among them, psoriasis has been described. However, at present the relationship between CD and psoriasis remains controversial since there are few and contrasting data on this topic. METHOD: Here we describe a case of psoriasis in a CD patient not responding to specific therapies for psoriasis. RESULT: The regression of skin lesions after gluten-free diet (GFD) was evident in a short time. CONCLUSION: The present case supports the association between CD and psoriasis and the concept that psoriasis in CD patients can be improved by GFD. Future studies are needed to clarify the possible mechanisms involved in this association.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号