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   16248篇
  免费   1281篇
  国内免费   39篇
耳鼻咽喉   141篇
儿科学   549篇
妇产科学   542篇
基础医学   2121篇
口腔科学   216篇
临床医学   2103篇
内科学   2937篇
皮肤病学   351篇
神经病学   1984篇
特种医学   346篇
外国民族医学   22篇
外科学   1582篇
综合类   134篇
一般理论   23篇
预防医学   2054篇
眼科学   141篇
药学   1093篇
中国医学   30篇
肿瘤学   1199篇
  2024年   29篇
  2023年   198篇
  2022年   296篇
  2021年   741篇
  2020年   472篇
  2019年   708篇
  2018年   729篇
  2017年   499篇
  2016年   534篇
  2015年   610篇
  2014年   804篇
  2013年   975篇
  2012年   1456篇
  2011年   1407篇
  2010年   761篇
  2009年   610篇
  2008年   988篇
  2007年   895篇
  2006年   808篇
  2005年   741篇
  2004年   647篇
  2003年   495篇
  2002年   418篇
  2001年   133篇
  2000年   123篇
  1999年   132篇
  1998年   88篇
  1997年   63篇
  1996年   54篇
  1995年   43篇
  1994年   37篇
  1993年   41篇
  1992年   83篇
  1991年   68篇
  1990年   70篇
  1989年   70篇
  1988年   57篇
  1987年   44篇
  1986年   60篇
  1985年   50篇
  1984年   39篇
  1983年   26篇
  1979年   26篇
  1978年   31篇
  1976年   29篇
  1975年   24篇
  1971年   26篇
  1970年   36篇
  1969年   26篇
  1968年   24篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Lesbian, gay, bisexual, transgender, queer and two-spirit plus (LGBTQ2S+) people have distinct healthcare needs that may be unaddressed in many undergraduate healthcare curricula. The Radiation Therapy Program (RADTH) at the University of Alberta underwent a review of the three-year didactic curriculum using an online survey. The survey sought to ascertain if, where and how topics related to LGBTQ2S + healthcare are taught. Results indicated that out of 10 RADTH program faculty respondents, three teach related topics. The total time dedicated within the three-year curriculum was approximately three and a half hours. Other findings showed that faculty are interested in receiving more education in this area and would favour discussions about how to incorporate these themes into appropriate courses. This preliminary investigation demonstrated that there has been some initial work in this area, but there is more to be done.  相似文献   
2.
Cancer Causes & Control - Congenital malformations are strong risk factors for childhood cancer. Our objective was to determine whether cancer survival differs by birth defect status among...  相似文献   
3.
4.
5.
6.
7.
8.
9.
Introduction: Current research suggests that pediatric stroke is associated with a reduction in intellectual functioning. However, less is known about academic achievement and the contribution of specific executive functions to math and literacy in this population. The current study investigates behavioral ratings of executive functioning and their relationship to math and spelling performance in children with a history of unilateral arterial ischemic stroke.

Method: Thirty-two pediatric patients with stroke (Mage = 9.5 ± 2.7 years) and 32 demographically equivalent, healthy controls were tested on standardized measures of arithmetic, spelling, and intelligence. Executive functioning data were collected via standardized parent questionnaire.

Results: Relative to controls, stroke participants demonstrated significantly poorer functioning in math, spelling, metacognition, and behavioral-regulation. Pencil and paper arithmetic was particularly challenging for the stroke group, with 40% of patients reaching levels of clinical impairment. Hierarchical regression in stroke participants further revealed that metacognition was a robust predictor of academic deficits. Stroke occurring in later childhood and affecting cortical and subcortical brain regions also presented as potential clinical risk factors.

Conclusions: Children with stroke were especially vulnerable to math achievement deficits. Metacognition made a substantial contribution to academic achievement abilities among stroke patients, and results underscore the importance of early metacognitive skills in the completion of schoolwork. Results also emphasize that pediatric stroke patients are a heterogeneous group with regard to functioning and that there is value in examining standard score distributions of clinical participant samples.  相似文献   

10.
Melatonin, the main hormone produced by the pineal gland, is secreted in a circadian manner (24‐hr period), and its oscillation influences several circadian biological rhythms, such as the regulation of clock genes expression (chronobiotic effect) and the modulation of several endocrine functions in peripheral tissues. Assuming that the circadian synchronization of clock genes can play a role in the regulation of energy metabolism and it is influenced by melatonin, our study was designed to assess possible alterations as a consequence of melatonin absence on the circadian expression of clock genes in the epididymal adipose tissue of male Wistar rats and the possible metabolic repercussions to this tissue. Our data show that pinealectomy indeed has impacts on molecular events: it abolishes the daily pattern of the expression of Clock, Per2, and Cry1 clock genes and Pparγ expression, significantly increases the amplitude of daily expression of Rev‐erbα, and affects the pattern of and impairs adipokine production, leading to a decrease in leptin levels. However, regarding some metabolic aspects of adipocyte functions, such as its ability to synthesize triacylglycerols from glucose along 24 hr, was not compromised by pinealectomy, although the daily profile of the lipogenic enzymes expression (ATP‐citrate lyase, malic enzyme, fatty acid synthase, and glucose‐6‐phosphate dehydrogenase) was abolished in pinealectomized animals.  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