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   3696篇
  免费   281篇
  国内免费   5篇
耳鼻咽喉   17篇
儿科学   104篇
妇产科学   68篇
基础医学   653篇
口腔科学   36篇
临床医学   431篇
内科学   823篇
皮肤病学   102篇
神经病学   449篇
特种医学   65篇
外国民族医学   4篇
外科学   320篇
综合类   23篇
预防医学   322篇
眼科学   26篇
药学   209篇
中国医学   16篇
肿瘤学   314篇
  2023年   21篇
  2022年   44篇
  2021年   97篇
  2020年   49篇
  2019年   71篇
  2018年   98篇
  2017年   60篇
  2016年   72篇
  2015年   98篇
  2014年   145篇
  2013年   159篇
  2012年   251篇
  2011年   302篇
  2010年   156篇
  2009年   143篇
  2008年   260篇
  2007年   242篇
  2006年   195篇
  2005年   246篇
  2004年   200篇
  2003年   190篇
  2002年   189篇
  2001年   72篇
  2000年   44篇
  1999年   52篇
  1998年   28篇
  1997年   46篇
  1996年   31篇
  1995年   27篇
  1994年   24篇
  1993年   15篇
  1992年   34篇
  1991年   29篇
  1990年   38篇
  1989年   21篇
  1988年   19篇
  1987年   17篇
  1986年   19篇
  1985年   18篇
  1984年   12篇
  1983年   13篇
  1981年   8篇
  1979年   13篇
  1978年   8篇
  1977年   7篇
  1976年   9篇
  1975年   9篇
  1972年   7篇
  1971年   11篇
  1969年   7篇
排序方式: 共有3982条查询结果,搜索用时 15 毫秒
61.
Elaidic acid is the main unnatural trans fatty acid isomer occurring during partial hydrogenation of vegetable oils used as ingredients for the formulation of processed foods. The main objective is to assess associations between processed food intakes and plasma phospholipid elaidic acid concentrations within the European Prospective Investigation into Cancer and Nutrition study. A cross-sectional study was used to determine fatty acid profiles in 3,003 subjects from 16 centers. Single 24-h dietary recalls (24-HDR) were collected using a standardized computerized interview program. Food intakes were computed according to their degree of processing (moderately/nonprocessed foods, processed staple foods, highly processed foods). Adjusted ecological and individual correlations were calculated between processed food intakes and plasma elaidic acid levels. At the population level, mean intakes of highly processed foods were strongly correlated with mean levels of plasma elaidic acid in men (P = 0.0016) and in women (P = 0.0012). At the individual level, these associations remained but at a much lower level in men (r = 0.08, P = 0.006) and in women (r = 0.09, P = 0.0001). The use of an averaged 24-HDR measure of highly processed food intakes is adequate for predicting mean levels of plasma elaidic acid among European populations.  相似文献   
62.
63.
64.
65.
This study examined cognitive predictors of sequential motor skills in 215 children with dyslexia and/or attention deficit/hyperactivity disorder (ADHD). Visual working memory and math fluency abilities contributed significantly to performance of sequential motor abilities in children with dyslexia (N = 67), ADHD (N = 66) and those with a comorbid diagnosis (N = 82), generally without differentiation between groups. In addition, primary diagnostic features of each disorder, such as reading and inattention, did not contribute to the variance in motor skill performance of these children. The results support a unifying framework of motor impairment in children with neurodevelopmental disorders such as dyslexia and ADHD.  相似文献   
66.
67.
68.
Study disparities in lifestyle habits and health characteristics of Canadian born population and immigrants with different duration of residence. Data are extracted from 2009 to 2010 public use micro-data files of Canadian Community Health Survey representing about 1.5 million people. Sixty-one percent of the study sample was born in Canada; 49 % males and 59 % below age 50. Amongst lifestyle habits, recent immigrants were less likely to be regular smokers, RR (95 % CI) 0.56 (0.36–0.88) and frequent consumers of alcohol 0.49 (0.27–0.89), but more likely to consume less fruits and vegetables 1.26 (1.04–1.53) than those born in Canada. Amongst health related factors, recent immigrants were less likely to be overweight 0.79 (0.62–0.99) and suffer from chronic diseases 0.59 (0.44–0.80), but more likely to have limited access to family medicine 1.24 (1.04–1.47) than Canada-born population. Immigration status is an important population characteristic which influenced distribution of health indicators. Prevention and promotion strategies should consider immigration status as an exposure variable in the development and implementation of public health programs.  相似文献   
69.
70.
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